TMd(® 
WAR DEPARTMENT TECHNICAL MANUAL 
FIELD X-RAY FILM 
PROCESSING EQUIPMENT 
ITEMS 961 1500 AND 
9611700, 9605500 
WAR DEPARTMENT • APRIL 1 9 i5 WAR DEPARTMENT TECHNICAL MANUAL 
T M 8-629 
FIELD X-RAY FILM 
PROCESSING EQUIPMENT 
ITEMS 9611500 AND 
9611700, 9605500 
WAR DEPARTMENT . APRIL 19i5 
United States Government Printing Office 
Washington • 1945 WAR DEPARTMENT 
Washington 25, D. C., 16 April 1945 
TM 8-629, Field X-ray Film Processing Equipment, is published 
for the information and guidance of all concerned. 
[AG 300.7 (21 Mar 45)] 
By order of the Secretary of War : 
Official : 
J. A. ULIO 
Major General 
The Adjutant General 
G. C. MARSHALL 
Chief of Staff 
Distribution ; 
AAF (5) ; AGE (5) ; ASF (2) ; T of Opns (10) ; Depts (10) ; 
Base Comd (5) ; S Div ASF (1) ; SvC (5) ; PE (2) ; ASF 
Dep (Med Sec) (10) ;Dep8 (ZI) (25) except St. Louis (75) ; 
GH (4) ; SH (2) ; Convalescent Hosp (2) ; USMA (20) ; 
A (2) ; CHQ (2) ; AF (5) ; T/O & E 8-187 (2) ; 8-510 (2) ; 
8-572S (2) ; 8-580 (3) ; 8-581 (3) ; 8-610 (1) ; 8-611 (1) ; 
8-667 (2). 
Refer to FM 21-6 for explanation of distribution formula. CONTENTS 
PART ONE. INTRODUCTION. 
Paragraph Page 
Section I. General. 
Scope 1 1 
Records 2 1 
II. Description and data. 
Description 3 1 
Data 4 10 
III. Tools, parts, and accessories. 
Tools 5 11 
Parts and accessories 6 11 
PART TWO. OPERATING INSTRUCTIONS. 
Section TV. General. 
Scope 7 15 
V. Service upon receipt of equipment. 
Remove packing and crating 8 15 
Assemble i 9 15 
Preoperative procedures 10 21 
Initial operation ,. 11 25 
Used equipment 12 26 
VI. Controls and instruments. 
General 13 26 
Controls 14 26 
Instruments . 15 32 
VII. Operation under usual conditions. 
General 16 32 
“ON” and “OFF” operation 17 33 
General precautions during normal operation 18 33 
VIII. Operation of auxiliary equipment. 
General 1 19 33 
\ 
Emergency power source 20 34 
IX. Operation under unusual conditions. 
Scope 21 34 
Extreme cold 22 34 
Extreme heat : 23 35 
Sand and dust-’ 24 35 
Dampness and excessive humidity 25 35 
PART THREE. MAINTENANCE INSTRUCTIONS. 
Section X. General. 
Scope 26 36 
XI. Special organizational tools and equipment. 
General 27 36 XII. Lubrication. Paragraph Page 
Lubrication 28 36 
XIII. Preventive maintenance service. 
General information 29 36 
Operator maintenance (first echelon) 30 38 
Organizational maintenance (second echelon) 31 39 
XIV. Trouble shooting. 
General 32 40 
Water does not cool 33 40 
Water does not heat 34 42 
PART FOUR. AUXILIARY EQUIPMENT. 
Section XV. Description and data. 
Description 35 43 
Tabulated data 36 44 
Tools, parts, and accessories 37 44 
Operating instructions 38 46 
Service upon receipt of used equipment 39 51 
Calibrated water valve 40 51 
Operation under usual conditions 41 51 
Operation under unusual conditions 42 52 
Maintenance instructions 43 52 
Maintenance operation 44 53 
Shipment and storage 45 54 
XVI. X-ray field unit, dryer and loading bin combina- 
tion: complete with air circulator. For field proc- 
essing unit. 
Description and data 46 55 
Operating instructions 47 58 
Controls 48 60 
Operation under usual conditions 49 60 
Maintenance instructions 50 60 
Trouble shooting 51 60 
Auxiliary equipment 52 61 
Storage and shipment 53 62 
PART FIVE. REPLENISHMENT OF DICHLORODIFLUOROMETHANE (FREON, F 12) 
REFRIGERANT GAS IN REFRIGERATION SYSTEM OF ARMY FIELD 
PROCESSING UNIT. 
Section XVII. General. 
Indication of low gas (F 12) pressure 54 63 
XVIII. Equipment and tools. 
General 55 63 
Tools 56 63 
Equipment 57 66 
XIX. Replenishment procedure. 
Connecting tank gauges and equipment 58 66 
Correlating temperatures and pressures 59 68 
Removal of replenishment equipment 60 69 
Leak detector torch (Halid Lamp) 61 70 
To free refrigerant expansion valve when stuck 62 70 APPENDIX. 
Paragraph Page 
Section I. Shipment and storage. 
General 1 71 
Pre-disassembly procedure 2 71 
Disassembly procedure 3 71 
Storage procedure : ,4 72 
Shipment 5 72 
Weights for processing unit 6 72 
II. References. 
Technical Manuals 7 72 
Technical Bulletins 8 72 
Army Service Forces Medical Supply Catalog 9 72 
List of forms mentioned in manual 10 73 
List of abbreviations used in manual 11 73 
INDEX 74 1 
PART ONE 
INTRODUCTION 
Section I. GENERAL 
1. SCOPE 
a. These instructions are published for the information and guid- 
ance of the personnel to whom this equipment is assigned. They 
contain information on the operation and maintenance of the equip- 
ment as well as descriptions of the major units and their functions 
in relation to the other components of the equipment. They apply 
only to the X-ray field unit processing unit, for darkroom and are 
arranged in five parts; Part One—Introduction; Part Two—Oper- 
ating Instructions; Part Three—Maintenance Instructions; Part 
Four—Auxiliary Equipment; and Part Five—Replenishment of 
Dichlorodifluoromethane (Freon, F 12) Refrigerant Gas. 
h. Reference to applicable Technical Manuals are included in the 
appendix at the end of the manual. Those parts keyed on the illus- 
trations with Medical Department numbers and formal nomencla- 
ture are regularly supplied as spare parts. All requisitions for 
spare parts should be submitted in accordance with latest ASF 
Supply Catalog MED 7 for this equipment. 
2. RECORDS 
No standard maintenance forms or records are required to be 
kept on this equipment except as the medical officer in charge may 
direct. 
Section II. DESCRIPTION AND DATA 
3. DESCRIPTION 
a. General. (1) The X-Ray Field Unit Processing Unit raises 
or lowers water temperature admitted from community sources to 
65° F. by means of a 1,200-watt electrical heater and refrigerant 
evaporator coil immersed in the mixing chamber. 
(2) Continual circulation of water is maintained whether the 
unit is used as a closed system (no fresh water piped in from an 
outside source) or when fresh water is admitted from an outside 2 
Med. Dept. No. Nomenclature 
1. Tank assembly. 
2. Fixer tank insert. 
3. Setting dial. 
4. SR00907 LAMPHOLDER, 
MEDIUM 
SCREW, PULL- 
CHAIN TYPE: 
5. Pull chain. 
Med. Dept. No. Nomenclature 
6. 9R20068 CLOCK, 
INTERVAL 
TIMER, 
WESTEX: 
7. Minute pointer. 
8. Developer tank 
insert. 
9. Base assembly. 
WESTEX: 
Figure 1. Medical Department Item 9611500 X-ray field unit processing unit, 
for darkroom, new style 981571*. 3 
source to the mixing chamber. This circulation is accomplished 
by a small pumping system. 
b. Identification. Unit is shipped in two crates: 
(1) Part one crate (16 cubic feet)—containing tank assembly, 
will be marked “Upper Section,” with tank sizes, serial numbers, 
transformer number, part number, name of contractor, order num- 
ber, delivery order number, model number, and name of item. 
(2) Part two crate (9 cubic feet)—containing the base assem- 
bly, will be marked “Item 9611500 two part item,” as well as name 
Med. Dept. No. Nomenclature 
1. Old style metal auxiliary wash tank. 
2. Old style processing unit main reservoir metal tank. 
3. SR00886 SWITCH, TOGGLE, 20-AMP., 125-V., SINGLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: 
Figure 2. Medical Items 9611500 and 9611700 X-ray field unit processing unit, 
and auxiliary wash tank, old style metal tank group 980205. 4 
of contractor, order number, delivery order number, serial number, 
model number, and name of item. 
c. Difference in models. (1) The Processing Unit is issued 
in one model only, but two styles of tank groups have been manu- 
factured with minor improvements on the base assemblies. The 
old style tank group consists of an all metal main reservoir tank 
with stainless steel developer and fixer tank inserts (fig. 2 (2)) 
which is the manufacturer’s style No. 980205. The new style tank 
group has a cypress wood main reservoir tank with enameled iron 
developer and fixer tank inserts (fig. 1) and is designated by the 
manufacturer as style No. 981574. 
Complete base and tank assemblies are interchangeable, and all 
parts are interchangeable except as noted in (2) below. Both 
styles have the same capacities and efficiency of operation. 
(2) Interchangeability of parts. (a) Tank group. All corre- 
sponding parts are interchangeable. Some parts required for style 
981574 are not required in style 980205, such as tie rods, wood base 
gaskets, and fittings necessary to secure and reinforce a tank con- 
structed of wood and its fittings. 
(b) Base assembly. Some parts of style 980205 and 981574 are 
not interchangeable. They are as follows: 
No. 9R20330 Mixing chamber, water, complete assembly. 
For style 980205 only. 
No. 9R20332 End plate refrigerating coil. This is the only 
part different in mixing chamber assembly. 
No. 9R20334 Thermostat, temperature, complete. For 
style 980205 only. 
No. 9R20336 Receiver and base assembly. For style 
980205 type using style 1141504 compressor 
unit. 
No. 9R20338 Bullseye, compressor. Not on Style 981574. 
No. 9R20328 Autotransformer, 50-cycle operation. For 
style 981574 only. 
d. Assemblies, The Processing Unit consists of two major as- 
semblies, The tank assembly (fig. 1(1)) and base assembly. (See 
ffc.l (9).) 
(1) Tank assembly. The tank assembly consists of cypress wood 
(fig. 3 (1)) or metal (fig. 2(2)) main reservoir tank, which holds 
temperature controlled water for washing the film. It contains 
two tank inserts, one for developing solution and the other for fix- 
ing solution. The fittings include rack hangers for film holders, 
the darkroom timer, the darkroom safelight and connecting fittings. 
A break-down of this assembly follows: 5 
Med. Dept. No. Nomenclature 
1. Cypress wood main reservoir tank. 
2. 9R20066 SAFELIGHT, COMPLETE: Without bulb. 
3. 9R20056 BRACKET, SAFELIGHT AND TIMER COMPLETE: 
4. Tank batten nuts Va x 13 hex and tie rods. 
Figure 3. Side view processing unit assembled. (a) Main reservoir tank with developer and fixer tank inserts 
in place. This is the main reservoir tank illustrated in figure 4. 
(b) Developer tank insert (fig. 1 (8)). This insert has an 
open top and is designed to hold the developing solution. It is 
emersed but never submerged in the main reservoir tank. 
(c) Fixer tank insert (fig. 1 (2)). This tank is similar to the 
developer tank insert but is designed to hold the fixing solution. 
It is also emersed but never submerged in main reservoir tank. 
Med. Dept. No. Nomenclature 
1. Community drain overflow fitting. 
2. 9R20014 PIPE, OVERFLOW, COMMUNITY DRAIN: Tank 
3. 9R20011 PIPE, CIRCULATING, OVERFLOW: Tank. 
4. Recirculating pipe fitting. 
5. 9R20070 RACK, FILM DEVELOPMENT HOLDER, REAR: 
6. 9R20072 RACK, FILM DEVELOPMENT HOLDER, FRONT: 
7. Circulating inlet pipe fitting. 
8. 9R20013 BUSHING, STRAINER, INLET PIPE: Tank. 
Figure U. Main reservoir tank. 7 
(d) Front and rear film holder supports (fig. 4 (5) and (6)), 
are placed in the main reservoir tank to support the film holders in 
a water bath. 
(e) Darkroom interval timer (fig. 1 (6)). The timer is mounted 
on an upright bracket behind the main reservoir tank. It is ad- 
justable for various developing times and at the end of the period 
rings a warning bell. 
(/) Darkroom safelight (fig. 3 (2)). The safelight is also 
mounted on the upright bracket behind the main reservoir tank. 
It provides light for the operator of the equipment and at the same 
time protects undeveloped film fronvexcessive light. 
(g) Fittings. Fittings consist of the circulating inlet pipe bush- 
ing with strainer (fig. 4 (8)), recirculating overflow with strainer 
(fig, 4 (3)), and an overflow community drain pipe (fig. 4 (2)) 
which acts as an outlet to the community drain. 
(2) Base assembly (figs. 5, 7, 9, and 12). The base assembly 
mechanism includes the systems for electrical refrigeration, heat- 
ing, and pumping water through the entire unit. It is made up of 
Med. Dept. No. Nomenclature 
1. Condenser radiator. 
2. 9R20124 RELAY, SWITCHBOX: 
3. 9R20006 ELEMENT, HEATING, WATER, IMMERSED, 1,200-WATT 
4. SR00897 VALVE, AIR, RADIATOR, Vs-INCH, COMPLETE: 
5. Base frame. 
Nomenclature 
Figure 5. Base assembly, right side and hack 8 
Med. Dept. No. Nomenclature 
1. Refrigeration evaporator coil. 
2. 9R20006 ELEMENT, HEATING, WATER, IMMERSED, 1,200-WATT: 
3. Heater terminals. 
Figure 6. Mixing chamber cross section. 9 
Med. Dept. No. Nomenclature 
1. Valve dial support. 
2. 9R20102 THERMOSTAT, TEMPERATURE, COMPLETE: 
3. Base screen retainer screw 10—32 x 'A: 
4. Cock, gauge, tee head, male and female Vs-inch 
brass. (Drain cock #3, on mixing chamber). 
5. Mixing chamber. 
6. Switchbox. 
7. 9R20002 SWITCH, BREAKER, SINGLE-POLE, SENTINAL: 
8. SR00886 SWITCH, TOGGLE, 20-AMP, 125-VOLT, SINGLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Cooler 
switch). 
9. SR00886 SWITCH, TOGGLE, 20-AMP, 125-VOLT, SINGLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Heater 
switch). 
10. SR00885 SWITCH, TOGGLE, 20-AMP, 125-VOLT, DOUBLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Line 
switch). 
11. Circulating water pump motor. (Component of 
9R20010 pump and motor, complete: Assembly). 
12. Pump, packing nut. (Component of 9R20010 pump 
and motor, complete: Assembly). 
13. Circulating water pump. (Component of 9R20010 
pump and motor, complete: Assembly). 
14. Valve, globe, screwed Vs-inch brass, emergency 
drain. 
Figure 7. Base assembly, front view. 10 
a welded base frame (fig. 5 (5)), which supports the tank group 
and contains the mechanisms and fittings necessary to operate the 
unit. A break-down of this assembly follows: 
(a) Mixing chamber (fig. 6 and fig. 7 (5)) contains the cooling 
and heating systems for the unit. Fresh water is mixed with over- 
flow water in this chamber, raised or lowered to the proper tem- 
perature, and pumped into the main reservoir tank. 
(b) One thousand two hundred watt electrical heater (fig. 6 (2)) 
immersed in the mixing chamber heats extraneous water as well 
as recirculated water to 65° F. before it is admitted to the main 
tank. 
(c) Refrigerator unit (fig. 11) cools water (by evaporator coil 
(fig. 6 (1)) immersed within the mixing chamber) which is ad- 
mitted from an outside source as well as recirculated to 65° F. 
(d) Circulating water pump and motor (fig. 7 (13) and (11), 
respectively) maintain a constant change of water in the main 
reservoir tank by pumping recirculated overflow water from the 
main reservoir tank into the mixing chamber, thereby forcing the 
temperature controlled water back into the main reservoir tank. 
(e) Calibrated valve (fig. 12 (7)) permits a flow under constant 
pressure of the maximum amount of water the unit can accommo- 
date for heating or cooling. 
(/) Thermostatic temperature controls (fig. 7 (2) and fig. 12 
(2)). The thermostatic temperature control operates the electric 
circuits which activate either the heater or the refrigerator com- 
pressor as needed. (See fig. 10.) 
(g) Switch box (fig. 7 (6)). The switch box contains master 
electrical controls for the main line (fig. 7 (10)), heater (fig. 7 
(9)), cooler (fig. 7 (8)), and pump motor overload switch (fig. 7 
(7)). Some of the earlier styles use only a main line switch. (See 
fig. 2 (3)). Only the newest units have been issued with the over- 
load pump switch. (See fig. 10.) 
(h) Connecting fittings, wiring, and piping carry the water, 
refrigerant, or electrical energy as needed. 
4. DATA 
a. Performance. Variations of both air and water tempera- 
tures may affect the performance of this unit. If room tempera- 
tures are extremely high or low, film holders and films in turn will 
pick up the heat or cold and when admitted to the unit in large 
quantities will affect liquid temperatures. Extremely high or low 
temperatures of admitted water will also affect the performance 
of this unit in that a longer period of time must be allowed to 
stabilize liquid temperatures at 65° F. b. Capacities. (1) Main reservoir tank: 41 gallons with de- 
veloper and fixer insert tanks in place. 
(2) Developer insert tank: 6 gallons. 
(3) Fixer insert tank: 10 gallons. 
(4) Circulation water pump: 20 gallons per hour. 
(5) Calibrated inlet valve. Variable with temperature of ad- 
mitted water and corresponding setting. 
(6) Film development capacities, (a) One gallon of developer 
will process thirty-six 14 x 17 films (or their equivalent) before 
it should be discarded, at the following rate: 
1 to 20—develop at NORMAL time. 
21 to 29—develop at NORMAL time plus 1 minute. 
30 to 36—develop at NORMAL time plus 2 minutes. 
(b) One 14 x 17 film equals three 8 x 10 films. 
One 14 x 17 film equals two 10 x 12 films. 
One 14 x 17 film equals one 11 x 14 and one 8 x 10. 
Note. It must be kept in mind that this developer depletion scale is for 
1 gallon of solution and may be applied in multiples of as many gallons as are 
required. 
Section III. TOOLS, PARTS, AND ACCESSORIES 
These tools, parts, and accessories will be kept with the equipment at all times 
5. TOOLS 
a. Nonreversible ratchet with offset handle (fig. 8 (3)). 
This tool is for use with the compressor unit valves and will be 
designated as the ratchet wrench, 
b. Crescent type adjustable wrench (fig. 8 (2)). This tool 
is all-purpose with this unit and will be designated as crescent 
wrench. 
c. Spanner face wrench (fig. 8 (1)). This tool is used on 
interconnecting handle fittings between the tank and base assem- 
blies, and will be designated as spanner wrench. 
6. PARTS AND ACCESSORIES 
a. Inlet or drain reducing nipple (fig. 8 (4)). This fitting 
will be found in the tool kit and is used for either the community 
inlet pipe as a reducer fitting or on the community drain outlet as 
a reducer fitting. It will be designated as a reducer, inlet, or drain. 
b. Orifice 20-50-pound water pressure (fig. 8 (7)), Orifice 
10-20-pound water pressure (fig. 8 (6)), Orifice 0-10-pound 
water pressure (fig. 8 (5)). These orifices are used in conjunc- Figure 8. Tools, parts, and accessories. 13 
Med. Dept. No. Nomenclature 
1. TR00002 WRENCH, SPANNER, FACE, X-RAY: 
2. TR01880 WRENCH, ADJUSTABLE, CRESCENT TYPE, SINGLE-END, 
8-INCH, 1 1/32-INCH JAW OPENING: 
3. TR00001 HANDLE, OFFSET, NONREVERSIBLE RATCHET, X-RAY: 
4. 9R20318 NIPPLE, REDUCING, INLET OR DRAIN: 
5. 9R20324 ORIFICE 0-10-LB PRESSURE, WATER: 
6. 9R20322 ORIFICE 10-20-LB PRESSURE, WATER; 
7. 9R20320 ORIFICE 20-50 LB PRESSURE, WATER: 
8. 9R20122 ELEMENT, THERMAL, 3.5-AMP, BREAKER, SWITCH: 
Key to Figure 8 tion with the calibrated inlet valve to reduce or stabilize the in- 
coming community water pressure. They will be designated as 
orifice. 
c. Thermal element 3.5-amp, for pump motor overload switch 
(fig. 8 (8)). This small electrical resistance element is received 
with the tool kit and must be installed when 50-cycle current is used. 
To be designated as Thermal element 3.5-amp. 15 
PART TWO 
OPERATING INSTRUCTIONS 
Section IV. GENERAL 
7. SCOPE 
Part Two contains information for the guidance of the personnel 
responsible for the operation of this equipment. It contains infor- 
mation on the operation of the equipment with the description and 
location of the controls, instruments, and fittings. 
Note. Failure or unsatisfactory performance of equipment will be reported 
on WD AGO Form 468. 
Section V. SERVICE UPON RECEIPT OF EQUIPMENT 
8. REMOVE PACKING AND CRATING 
a. The unit is shipped in two crates, the smaller one containing 
the base assembly and tools, the larger one containing the main 
reservoir tank and related parts including the overflow pipes and 
strainer, light and timer bracket, the interval timer, the darkroom 
light, and the rack film holders and the tank inserts. Some units 
will also include a 50-cycle transformer. 
b. Both crates should be unpacked in an upright position exer- 
cising care so as not to bend or damage the equipment. The acces- 
sories should be unwrapped and checked for damage before dis- 
posing of the wrapping materials. Place the accessory parts in a 
safe place while assembling the heavy parts of the unit. 
9. ASSEMBLE 
All water valves and connections are identified by means of num- 
bered metal tags. Other parts are identified on the figures in this 
manual. 
a. Locate base of unit. After removing the packing materials, 
place the base assembly in the location where it is to be used, 
keeping in mind the following considerations: 
(1) Allow at least 12 inches of air space all around the base to 
permit proper air circulation. A cool, dry, well-ventilated place 
is preferable. 16 
(2) The floor should be reasonably level to insure proper splash 
lubrication of the compressor. 
(3) Always allow sufficient room for servicing the unit. 
(4) Avoid a location where heated air discharge from the re- 
frigerant condenser will be recirculated. 
(5) The side with the water pump should be kept to the front. 
(6) Avoid locations where the unit will be exposed to freezing 
temperatures after it is shut down, unless provision has been made 
to drain all water from the entire system. 
b. Remove side covers. (1) Loosen (do not completely re- 
move) the four screws (fig. 7 (3)), which hold each side cover 
in place. 
(2) Slip covers up and off. 
c. Free compressor. (1) Remove blocks from under compres- 
sor unit. 
(2) On spring mounted compressor units, loosen the three cas- 
tellated hexagonal nuts on the base of the sealed compressor unit 
until they stop against the cotter pins which pass through each of 
the studs. The compressor will not float freely on its three mount- 
ing springs. (See fig. 9 (6).) 
Caution: If the unit is to be transported, these nuts must first 
be locked in place or broken connections and loss of refrigerant 
will result. 
d. Assemble tank group. (1) Screw the long 1-inch diameter 
overflow pipe into its fitting inside the main reservoir tank. (See 
fig. 4 (1).) Make hand tight only. 
(2) Screw the long screened recirculating overflow pipe into 
its fitting beside the 1-inch pipe. (See fig. 4 (4).) Make hand- 
tight only. 
(3) Mount safelight and timer. Mount the safelight and timer 
bracket (fig. 3 (3)) on the main reservoir tank as shown in figure 3. 
Remove the bottom colored glass window from the safelight, then 
remove the front colored glass window, screw the 10-watt bulb 
provided into the socket, and replace the glass windows. Screw 
the safelight assembly into the socket provided on the safelight 
and timer bracket. (See fig. 1 (4).) Position the interval timer 
as shown in figure 1. 
e. Test tank group for leaks (wood only). (1) Without 
removing the plug in the circulating inlet fitting (fig. 4 (7)), fill 
the tank half full of water, and observe for leaks. If small seepage 
leaks appear, allow the tank a setting-up period of at least 1 hour. 
(2) If at the end of the 1-hour period leaks still exist, tighten 17 
the eight tank batten nuts and tie rods (fig. 3 (4)) until the tank 
is watertight. Then test for another hour. 
Caution: Do not tighten the tie rods too tight as it is possible 
to crush the tank. 
(3) When tests show the tank is not leaking, drain the tank by 
removing the 1-inch overflow pipe and when drained replace the 
overflow pipe. 
(4) Replace the plug with the short inlet pipe bushing with 
strainer. (See fig. 4(8).) Make handtight only. 
/. Mount tank group on base assembly. (1) Carefully place 
the main reservoir tank in position on the base assembly with the 
long 1-inch overflow pipe to the left rear. The tank should fit 
snugly within the angle iron at the top of the base frame. 
(2) If the metal tank is issued, the tank should be firmly locked 
in place by means of the thumb screws provided on the base which 
screw into the main reservoir tank. 
g. Make plumbing connections. (1) Connect tank coupling 
No. 1 (fig. 9 (1)) to the connector fitting of the inlet pipe bushing 
on the right front. (See fig. 4 (7).) 
(2) Connect tank coupling No. 2 (fig. 9 (5)) to the connector 
fitting of the recirculating pipe on the left rear. (See fig. 4 (4).) 
(3) Connect the other tank coupling No. 2 (fig. 9 (4)) to the 
connector fitting of the long 1-inch community drain overflow pipe 
on the left rear. (See fig. 4 (1).) 
(4) Connect the community drain piping to fitting No. 5 on the 
lower end of the 1-inch community drain overflow pipe. 
(5) Connect community cold water supply to coupling No. 4 
(fig. 12 (8)) on the calibrated No. 4 TAG valve. The reducer 
supplied in the tool kit may be utilized for this purpose if necessary. 
(See pars. 14d and e.) 
h. Make electrical connections for 60-cycle operation. 
(1) Connect the equipment to single-phase, 115-V., 60-cycle, AC 
power supply. 
(2) Ground the unit by means of a %-inch metal rod or pipe 
driven at least 3 feet into moist earth or connect the grounding 
lead provided (fig. 12 (9)) to a cold water pipe. The point of 
contact between the ground lead and the rod or pipe should be 
clean and bright. 
i. Make electrical connections for 50-cycle operation. 
(1) For 50-cycle operation of the Processing Unit the refrigerator 
unit has to be operated in conjunction with a 9R20328 Autotrans- 
former. 18 
Med. Dept. No. Nomenclature 
1. Circulation tube coupling with handle. 
2. Range adjustment knob. 
3. Drain tube bushing. 
4. Community drain tube coupling with handle. 
5. Recirculating tube coupling with handle. 
6. Mounting spring, compressor. 
Figure 9. Base assembly, top. 
(a) The capacity of the circulating pump and motor will be 
lowered to 5/6 of the 60-cycle capacity. 
(b) The heater circuit is undisturbed. 
(c) The cooling capacity of the unit on 50-cycles is 83 percent 
of that on 60-cycle operation. 
(2) Connecting the 9R20328 Autotransformer for 50-cycle op- 
eration. Due to the fact that the capacity of the 9R20328 Auto- 
transformer is limited only to supplying power for the refrigerator 
unit, the following changes must be made: 
(a) The present feed for the refrigerator is removed. 
(b) The PS-PF terminals of the 9R20328 Autotransformer are 
connected to the points in the circuit where the refrigerator feed 
is obtained. 19 
(c) The refrigerator feed is now connected to the autotrans- 
former terminals SI and S2. 
(d) The remainder of the circuit is left undisturbed. (See fig 
10.) 
Med. Dept. No. Nomenclature 
1. 9R20102 THERMOSTAT, TEMPERATURE, COMPLETE: 
2. Compressor motor. 
3. 9R20006 ELEMENT, HEATING, WATER, IMMERSED, 1,200- 
WATT: (1,200-WATT, ELECTRIC HEATER). 
4. 9R20124 RELAY, SWITCHBOX: 
5. Solenoid. 
6. 9R20002 SWITCH, BREAKER, SINGLE-POLE, SENTINAL: 
7. SR00886 SWITCH, TOGGLE, 20-AMP, 125-V., SINGLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Cooler 
switch). 
8. SR00886 SWITCH, TOGGLE, 20-AMP, 125-V., SINGLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Heater 
switch). 
9. SR00885 SWITCH, TOGGLE, 20-AMP, 125-V., DOUBLE-POLE, 
SINGLE-THROW, HEAVY-DUTY, FLUSH: (Line 
switch). 
10. .Circulating water pump motor: (Component of 
9R20010 pump and motor, complete: Assembly). 
Figure 10. Wiring diagram. 20 
(3) If after operation the circuit breaker continues to break 
the pump motor circuit, follow the explanation and instructions in 
paragraph 9j. 
j. Installation of 3.5-amp. thermal element for pump cir- 
cuit breaker. (1) The pump motor circuit breaker which serves 
as the ON-OFF switch in the switch box for the pump contains a 
3.1-ampere thermal heater as shipped. This is the proper breaker 
rated heater to be used in this unit on 60-cycle operation. However, 
should the unit be operated on 50-cycle current, then the pump 
motor will draw more current, the amount of which varies some- 
what with each individual motor and pump unit. Under certain con- 
ditions with elevated temperatures the breaker or ON-OFF switch 
may keep breaking to OFF because of the motor drawing slightly 
more than 3.1 amperes on 50-cycle and the elevated (room) tem- 
perature. If this condition should occur on 50 cycles, then the 3.1- 
ampere thermal heater in the water pump motor circuit breaker 
should be replaced by the accompanying 3.5-ampere thermal heater 
as in (2) below. This allows the motor to operate at higher cur- 
rents which the motor can safely do as long as it is running. Do 
not use the 3.5-ampere thermal heater for 60-cycle operation as 
the 3.1-ampere heater furnishes protection against a stalled pump 
and a possible burned out motor which is unusual but possible if 
the pump should get clogged up with some foreign material. The 
3.5-ampere heater does not furnish this protection on 60 cycles 
but does on 50 cycles.. Do not use the 3.5-ampere heater unless 
the above trouble occurs. 
(2) To change heater element turn off the power supply and lift 
off the front perforated panel from the base; then proceed with the 
following steps: 
(a) Remove the front cover of the switch box by removing the six 
roundhead screws holding it in place. In the upper right-hand end 
of the switch box is the ON-OFF switch for the pump which is also 
the circuit breaker. 
(b) Remove the front cover of the breaker by removing the one 
screw in the front of it. 
(c) Remove the two screws in the left-hand upper and lower 
corners of the breaker which hold the breaker in place. 
(d) Trip the breaker by exerting slight pressure to the left by 
means of the finger on the vertical bimetallic strip to the right of 
the red button. 
(e) Slide the thermal heater out by pulling gently on the red 
button and slide the new heater in. 21 
(/) Replace all the covers, reset the breaker, and the unit is 
again ready for operation. 
10. PREOPERATIVE PROCEDURES 
a. Correct calibrated valve and orifice. If it is desired to 
have a flow of community water blend continuously with recircu- 
lated water in the reservoir, proceed as follows: 
(1) Measure the community water pressure and insert proper 
orifice into the union on the calibrated No. 4 TAG valve. (See par. 
14e.) 
(2) Determine temperature of community water with a ther- 
mometer. 
Note. Allow community water to run freely for at least 15 minutes before 
taking the final reading. 
(8) Set the pointer (fig. 12 (6)) on the calibrated No. 4 TAG 
valve to the nearest corresponding Fahrenheit temperature read- 
ing on the dial. (See fig. 12 (5).) 
(4) The water now passing through the unit will be a mixture 
of community and recirculated water, part of which will continually 
flow into the community drain over the top of the 1-inch overflow 
pipe in the tank. It is important that the calibrated valve be set 
very carefully if water temperature in the main reservoir tank is 
to be maintained. (See par. 14d.) The valve adjustment should 
be changed with the seasons, or whenever there is likely to be an 
appreciable change in community water temperature. 
b. Check refrigerant line. The liquid line valve (fig. 11 
(3)), suction line valve (fig. 11 (6)), and receiver valve (fig. 11 
(1)) on recent issues have been shipped open. This is contrary to 
policy but of necessity due to shortage of tools supplied with this 
equipment. However, an easy check may be made of the position 
of the valves by turning on the equipment; if the compressor does 
not operate, although the water temperature calls for cooling, you 
can assume the valves are in “closed” position. 
c. Refrigerant valves in closed position. With valves in 
closed position proceed as follows: 
(1) Remove protective screw cap from the “liquid line shut-off 
valve” (fig. 11 (3)) located on the right side of the liquid refrig- 
erant receiving tank. This is a valve with a copper tubing coming 
off the top. 
(2) Remove the protective screw cap from the “receiver shut- 
off valve” located on the right side of the liquid refrigerant receiv- 
ing tank. (See fig. 11 (2),) 
(3) Remove the protective screw cap from the “suction line shut- 
off valve” (fig. 11 (6)) located near the No. 5 TAG fitting. 22 
Med. Dept. No. Nomenclature 
1. Receiver valve. 
2. Protective screw cap. 
3. Liquid line valve. 
4. Refrigeration condenser. 
5. Compressor. 
6. Suction and support valve. 
7. Refrigerant pressure control. 
Figure 11. Refrigerator unit. 
(4) By means of the special ratchet wrench provided with the 
equipment, open the “liquid line shut-off valve” all the way by 
turning the stem in a counterclockwise direction until it stops. 
Replace the protective screw cap, and tighten it moderately with 
a wrench, 
(5) By means of the special ratchet wrench open the “receiver 
shut-off valve” all the way by turning the stem in a counterclock- 23 
wise direction until it stops. Replace the protective screw cap, 
and tighten moderately with a wrench. 
Caution: Do not operate the unit with “receiver shut-off valve” 
closed. Failure to open this valve before the unit is started will 
build up excessive pressure in the cylinder head and may damage 
the compressor. 
(6) By means of the ratchet wrench, open the “suction line 
shut-off valve” all the way by turning the stem in a counterclock- 
wise direction until it stops. Replace the protective screw cap, 
and tighten moderately with a wrench. 
Caution: Do not operate the unit with the “suction line shut-off 
valve” closed. Failure to open this valve before the unit is started 
will cause oil from the compressor crankcase to be pumped into the 
liquid receiver tank. 
d. Position of water valves for an open system (community 
water source and drain). (1) Close emergency drain valve No. 3 
TAG. (See fig. 7 (14).) 
(2) Close water drain cock No. 3 TAG on mixing chamber. (See 
%. 7 (4).) 
(3) Close air bleeder valve on mixing chamber (use key pro- 
vided). (See fig. 5 (4).) 
(4) Open calibrated valve No. 4 TAG (fig. 12 (7)) all the way 
by giving it a half turn to the 65° position at which it will stop. 
Note. All water valves and cocks close in a clockwise direction. 
(5) Open the community water supply line valve (not part of 
the equipment) slowly until it is completely open. When the water 
level in the main reservoir tank has reached the top of the 1-inch 
overflow pipe, shut off the No. 4 TAG calibrated valve by giving 
it a half turn to the “closed” position. At average community water 
pressure of about 45 pounds per inch, it should take about 2 hours 
to fill the tank. If faster filling is desired, a supplementary source 
of water should be provided and the water fed into the tank by a 
hose or other suitable means. 
Note. Do not use excessive force when operating calibrated No. 4 TAG 
valve or the accuracy of the calibration may be affected. Turning it gently to 
the “closed” position will effectively shut off all water flow. 
(6) With the reservoir tank filled to the proper level examine all 
three couplings underneath the tank, as well as other parts of the 
water system, for leaks. 
e. Position of valves as a closed unit. If a community water 
and drain supply is not available, proceed as follows: 
(1) Close emergency drain valve No. 3 TAG. (See fig. 7 (14).) 24 
Med. Dept. No. Nomenclature 
1. Refrigeration expansion valve. 
2. 9R20102 THERMOSTAT, TEMPERATURE, COMPLETE: 
3. Differential adjustment knob. 
4. Retainer screw for calibrated dial 6—32 x %. 
5. Graduated valve dial. 
6. Index pointer. 
7. Valve, globe, screw, Vs-inch brass calibrated. 
8. Union, pipe, female, Vs-inch, ground joint, brass inlet 
9. Wire No. 8, copper, stranded insulated. 
Figure 12. Base assembly, left side. 
(2) Close water drain cock No. 3 TAG on mixing chamber. See 
%• 7 (4).) 
(3) Close air bleeder valve on mixing chamber (use key pro- 
vided). (See fig. 5 (4).) 
(4) Close calibrated valve No. 4 TAG. (See fig. 12 (7).) Fill 
the main reservoir with water of a temperature as close to 65° F. 
as can be obtained until the water level has reached the top of the 
1-inch overflow pipe. With the developer and fixer tanks in place, 
the main reservoir tank capacity is approximately 41 gallons. With 
these tanks removed, the reservoir capacity is approximately 56 
gallons. 25 
/. Bleed water system. To make certain that the water cir- 
culating system is functioning properly and that the water pump 
has not become airbound, proceed with the following steps, ivith 
the unit in operation. 
(1) Check the water level in main reservoir tank to make certain 
it is even with the top of the 1-inch overflow pipe. 
(2) By means of the key wrench provided, carefully open the 
“Air Bleeder Vent” very slightly. (This is located at the heater end 
of the mixing chamber. (See fig. 5 (4).)) Keep this vent open 
until all trapped air has left the system and water begins to come 
out freely after which it should be closed. Be careful not to allow 
water from this vent to come in contact with the heater relay in 
the housing directly underneath. 
(3) Asa final check on whether circulation is taking place, hold 
a small piece of soft paper over the long screened overflow circula- 
tion pipe near the 1-inch drain line. If the paper is sucked to the 
pipe, the water system is circulating satisfactorily. It is important 
that all air he removed from the water system if proper temperature 
control is to he obtained. The water pump will continue to operate 
all the time providing its switch is in the “ON” position. Throwing 
off the “line” switch will completely shut down the entire unit. 
g. Check power source of base assembly and safelight. 
Plug in the safelight cord and the base assembly cord to the outlet 
of single-phase 115-volt, 60-cycle, AC power supply. 
11. INITIAL OPERATION 
a. Turn on the line, pump, heater, and cooler switches located 
on the lower right-hand side of the base assembly. Both the con- 
denser fan and water pump should now begin to operate. The 
sealed compressor unit will also operate if the water temperature 
is above 65° F. With the starting of the compressor, the refriger- 
ant will be free to circulate throughout the system, and the com- 
pressor should be permitted to operate until it shuts down auto- 
matically. If the water temperature is below 65° F., the heater 
unit will operate instead of the compressor. 
b. The equipment is now in full operation and the temperature 
of the water in the main reservoir tank will be raised or lowered 
(depending upon the initial temperature of the water) until an 
average value of 65° F. is reached, at which temperature it will be 
maintained over a range of from 62° to 68° Fahrenheit. 
c. Replace the four perforated side covers on the base. 
d. Providing the calibrated valve has previously been turned to 
the “closed” position and the unit is operated with the community 26 
water source position, the pointer of the calibrated valve points to 
the nearest Fahrenheit reading on the dial. 
12. USED EQUIPMENT 
Upon receipt of class B or used equipment, follow the same pro- 
cedure as outlined in paragraphs 8, 9, 10, and 11. In addition, a 
run in time should be allowed with a manual check of the water 
temperature by means of an accurate thermometer suspended in 
the center of the main reservoir tank, as well as thorough lubrica- 
tion of the equipment as outlined in paragraph 28. The most im- 
portant inspection of this equipment will be visual. 
Section VI. CONTROLS AND INSTRUMENTS 
13. GENERAL 
All controls have been carefully set at the factory, but as an addi- 
tional check on a new installation, a thermometer should be sus- 
pended in the main body of water at about the center of the tank 
and readings taken whenever the heater relay (fig. 5(2)) operates. 
At 62° F. the cooling unit compressor (fig. 11 (5)) should auto- 
matically shut off and the heater (fig. 6 (2)) turn on. At 68° F. 
the heater should automatically turn off and the cooling unit com- 
pressor turn on. If the final thermometer readings, after equilib- 
rium is reached, are found to be respectively lower and higher than 
these values, a corresponding adjustment of the thermostatic water 
temperature control (fig. 7 (2)) must be made. (See par. 145.) 
If the community water, or ambient temperatures are higher than 
65° F., the “Heater” switch (fig. 7 (9)) should be turned off and 
the “Cooler” switch (fig. 7 (8)) turned on. If lower than 65° F., 
the “Heater” switch should be turned on and the “Cooler”’ switch 
off. Turning off the “main line” switch (fig. 7 (10)) disconnects 
all circuits from the main line. 
14. CONTROLS 
a. The motor pump circuit breaker trips off automatically due 
to an amperage overload drawn by the water pump motor. This 
control is located on the upper right-hand corner of the switch box. 
(See fig. 7 (7) and fig. 10 (6).) When tripped out this switch may 
be reset as follows: 
(1) Allow about 20 seconds for the thermal element within the 
switch to cool. 
(2) Push the switch lever firmly to its “OFF” position. 27 
(3) Then push switch lever to the “ON” position. 
b. Thermostatic water temperature control. (1) The adjust- 
able water temperature control (fig. 7 (2), fig. 12 (2), and fig. 10 
(1)) maintains the water in the mixing chamber at a constant 
average temperature, depending upon the setting selected. It is 
the only adjustment provided for directly controlling the water 
temperature. It has been set for 65° F. at the factory, which 
should be satisfactory for all normal operations. If it should be- 
come necessary to make an adjustment, turn the range adjustment 
knob on (fig. 9 (2)) the top of the control clockwise to raise the 
average water temperature, and counterclockwise to lower it. The 
knob should not be turned too much in order to avoid going too far 
past the setting desired. The temperature control should be ob- 
served before placing the upper main reservoir tank on the pedestal 
base. The range setting and dial and the differential adjustment 
knob are easily seen. 
Note. If it should become necessary to make an adjustment, on an old style 
980205 unit Thermostatic Water Temperature Control which is on the first 
style issued, loosen the locking screw on the range adjustment lever and move 
the latter to the left to lower the average water temperature, and to the right 
to raise it. The cover should be removed and the contacts observed during this 
operation. Move the adjustment lever only sufficiently to make or break the 
contacts, as the case may be, in order to avoid going too far past the desired 
setting. 
(2) In operation the thermostatic temperature control automati- 
cally turns both the cooling compressor, and the heating unit on 
and off through the relay as the occasion demands. As the tempera- 
ture of the water in the mixing chamber drops to 62° F., the con- 
tacts of the water temperature control close, thereby energizing 
the relay which in turn opens the compressor motor circuit and 
turns on the heater. As the temperature rises to 68° F., the con- 
trol contacts open, deenergizing the relay which opens the heater 
circuit and starts the compressor. (See fig. 10.) This is repeated 
continuously as long as the equipment is in operation. The differ- 
ential has been set at the factory. If it should be necessary to 
change the differential, it can be done by turning the differential 
adjustment knob (fig. 12 (3)) on the lower rear of the temperature 
control slightly in the “WIDER” direction to increase the differ- 
ential and turn in the direction opposite to the “WIDER” direction 
indicated on the knob to decrease the differential. 
(3) It is important that the actual automatic shutting-off and 
starting of the compressor be performed by this control and not by 
the refrigerant pressure control. Whenever a change in adjust- 
ment is made on the water temperature control, this point should 
be checked as outlined in c below. 28 
c. Refrigerant pressure control. The refrigerant pressure 
control (fig. 11 (7)) directly controls the operation of the sealed-in 
compressor so far as circulation of the refrigerant is concerned but 
provides no direct control over water temperature. 
(1) It has two adjustments, one marked “DIFF” and the other 
“RANGE.” The differential adjustment should never be tampered 
with except by a trained man in a fifth-echelon shop since special 
equipment is required to set it properly. 
(2) The range setting should be changed only if it is noted that 
the Refrigerant Pressure Control turns off the compressor motor 
before the Water Temperature Control has had a chance to perform 
this function. (See b above.) If such is the case, proceed as 
follows: 
(a) Remove cover of Water Temperature Control. (See fig. 7 
(2).) 
(b) Turn range screw on Refrigerant Pressure Control only 
one-half turn in the “Colder” direction as indicated by the arrow. 
(c) Wait for compressor to start automatically and observe 
whether closing of the contacts in the thermostatic water tempera- 
ture control turns off the compressor. 
(d) If the compressor stops before the thermostatic water tem- 
perature control contacts have closed, in adjusting a style 981574 
unit, do not turn the “Range” screw any more in the “Colder” 
direction as the water may freeze on the refrigerant coil, causing a 
rupture of the cylinder. Check other factors such as restricted 
water flow. Do not use the “RANGE” setting to obtain a lower 
water temperature—only the water temperature control can be 
used for this purpose. (However, in adjusting a style 980205 unit 
proceed by turning the “Range” screw another half turn in the 
“Colder” direction and repeat the observation in (c) above. Con- 
tinue adjusting the “Range” setting the “Colder” direction, one- 
half turn at a time, until the compressor is turned off only by the 
closing of the Water Temperature Control contact. Again do not 
use the “RANGE” setting to obtain a lower water temperature— 
only the water temperature control can be used for this purpose.) 
d. Calibrated water valve control. (1) The calibrated water 
valve, identified as the No. 4 TAG valve (fig. 12 (7)) (see also fig. 
13), provides a convenient means for continually blending com- 
munity and recirculated water in the main tank. 
(2) Since the quantity of community water which can be ad- 
mitted without upsetting the temperature balance of the equipment 
is dependent on the community water temperature, this valve must 29 
be carefully set to conform to community water temperature at all 
times if satisfactory operation is to be expected. 
(3) It is provided with a fixed graduated valve dial (fig. 12 (5)) 
calibrated in degrees Fahrenheit (from 40° to 90°), and an index 
pointer on the wheel. (See fig. 12 (6).) In operation, the com- 
munity water temperature is first determined in terms of degrees 
Fahrenheit, after which the wheel pointer is carefully set to the 
corresponding temperature value on the dial. 
(4) The 65° position on the dial represents the maximum open- 
ing of the valve, while the 90° position represents the minimum 
opening. If it is desired to shut off all community water, the pointer 
should be set to the “closed” position. 
(5) Constant use of this valve over long periods of time may 
ultimately result in the introduction of slight inaccuracies due to 
normal wear of the valve seat. If this should occur, the necessary 
correction can quickly be made as follows: 
(a) Slowly turn the valve wheel in a clockwise direction until 
the flow of community water just stops. Do not turn past this point 
by the use of excessive force. 
(b) Loosen the four retainer screws (fig. 12 (4)) located on the 
inner circumference of the calibrated dial. This will permit the dial 
to turn. 
(c) Turn the calibrated dial until the word “closed” is directly 
under the index pointer on the valve wheel. 
(d) Tighten all four screws, being careful not to upset the ad- 
justment. See e below, for additional information on the calibrated 
water valve. 
e. Calibrated valve orifice. (1) The calibration or the cali- 
brated water valve control is based on a water pressure of about 
10 pounds per square inch at the valve seat opening. 
(2) Inasmuch as the various temperature values on the scale of 
the calibrated valve actually represents different degrees of open- 
ing, and are themselves based on a given quantity of water flow 
through that opening at 10 pounds per square inch pressure, it is 
important that this pressure be maintained at all times if accurate 
performance is to be expected. 
(3) In order to reduce community water pressures to the re- 
quired 10 pounds per square inch, three pressure-reducing orifices 
(fig. 8 (5), (6), and (7)) each with a different size opening, are 
supplied with the apparatus. 
The smallest (tV inch) size is shipped already mounted in the 
equipment and is suitable for community water pressures ranging 
from 20 to 50 pounds per square inch. The intermediate (3/32 30 
inch) size should be used on community pressures of 10 to 20 
pounds per square inch, and the largest (% inch) size f to 10 
pounds per square inch pressures. 
(4) To replace an orifice, open the small union on the No. 4 
connection directly under the calibrated valve. (See fig. 13 (1) 
and (3).) 
Med. Dept. No. Nomenclature 
1. Small union on calibrated valve. 
2. Orifice: (See fig. 8 (5), (6), and (7).) 
3. Orifice union in place. 
Figure 13. Orifice assembly. 
Remove the orifice (fig. 18 (2)) replace it with one of the required 
size, and close the union. 
f: Water heater. (1) The water heating unit, the terminals 
(fig. 6 (3)) for which are located at one end of the mixing chamber, 
is of the immersion type, and has provision for three different de- 
grees of heat. It can be turned on or off at will by means of the 
heater switch located on the lower right front of the base. If the 
community water, or ambient temperatures are higher than 65° F., 
the heater switch should be turned off and the cooler switch on. 
If lower than 65° F., the heater switch should be turned on and the 
cooler switch off. 
(2) The equipment is originally shipped with the heater ter- 
minals connected as a 1,200-watt unit. (See fig. 14 (3).) However, 
if a slower heating is desired, the heater may be connected either 
as a 600-watt (fig. 14 (2)) or 300-watt (fig. 14 (1)) unit by chang- 
ing the connections as shown in figure 14. (The lower terminal in 
all illustrations is the “common” lead.) 31 
Med. Dept. No. Nomenclature 
1. 300-watt, connection. 
2. 600-watt, connection. 
3. 1,200-watt, connection. 
Figure H. Heater connection. 
(3) In order to avoid accidents, all power should be shut off at 
the main service switch before making any of the above changes. 
g. Control switches. (1) Main line switch. This switch is 
located at the left-hand side of the switch box, and controls the 
electrical power to the entire unit. It is labeled “line,” and is an 
ordinary “ON” and “OFF” heavy-duty toggle switch. (See fig. 7 
(10) and fig. 10 (9).) 
(2) Heater switch. This switch is the center switch of the three 
toggle switches in the switch box and controls only the electrical 
power to the immersed water-heating element (fig. 7 (9) and fig. 
10 (8)). 
Providing admitted water from a community source is always 
above 65° F., this switch should be in the “OFF” position at all 
times. 
(3) Cooler switch. This switch is the right-hand switch of the 
three toggle switches in the switch box (fig. 7 (8) and fig. 10 (7)) 
and controls only the electrical power to the compressor and con- 
denser motors. 
Providing admitted water from a community source is always 
below 65° F,, this switch should be in the “OFF” position at all 
times. 
(4) Darkroom light stvitch. This switch is on the darkroom 
light socket and is of the ordinary pull chain type. (See fig. 1 (5).) 
This light may be controlled separately whether the unit is in opera- 
tion or idle. 32 
h. Relay control. The relay (fig. 5 (2) and fig. 10 (4)) which 
energizes the compressor motor or the immersed heating element 
is located under the heater terminal end of the mixing chamber. 
Upon referring to figure 10 it is noticed, the thermostatic water 
temperature control (fig. 10 (1)) is open and the relay solenoid 
(fig. 10 (5)) is not energized, thus leaving the compressor motor 
(fig. 10 (2)) energized and the heating element (fig. 10 (3)) de- 
energized. However, if the thermostatic water temperature con- 
trol’s circuit is closed, the solenoid is energized thereby closing 
the heating element circuit and opening the compressor motor 
circuit. 
The contact points are prone to rusting and sticking because of 
moisture and drippage. When this occurs remove the plate cover- 
ing the relay box (fig. 5, part 2) and clean the contact points with 
a fine sand paper then readjust the points for correct contact and 
replace the relay cover. 
15. INSTRUMENTS 
There is only one instrument on this unit and it is the interval 
timer (fig. 1 (6)) mounted above and behind the main reservoir 
tank on the darkroom light bracket. This interval timer may be 
set to give an auditory bell signal after an elapse of any desired 
time up to 15 minutes. 
a. This setting of time elapse is accomplished by lifting the 
“minute pointer” (fig. 1 (7)) slightly and placing it so the arrow 
is corresponding to the desired time. The “minute pointer” is held 
in place by ratchet teeth and has a bumper protruding from it to 
stop the “setting dial.” (See fig. 1 (3).) 
b. No winding is necessary for this timer as movement of the 
“setting dial” winds the clock mechanism as well as the bell 
mechanism. 
The “setting dial” should always be turned in a clockwise direc- 
tion and return to rest on the “0.” 
Section VII. OPERATION UNDER USUAL CONDITIONS 
16. GENERAL 
The technical operation of this equipment is the responsibility of 
the medical officer in charge. The instructions in this manual cover 
mechanical operation only. 33 
17. “ON” AND “OFF” OPERATION 
a. When the Processing Unit is assembled and ready for opera- 
tion it may be put into operation by closing the main line switch, 
heater switch, cooler switch, and pump switch circuit breaker, all 
of which are located in the switch box at the lower right-hand cor- 
ner. With these switches in the “ON” position the water should 
be given a reasonable length of time to normalize to 65° F., at 
which time the unit is ready for use. 
b. Operation of the unit may be stopped by throwing the line, 
heater, and cooler switches into the “OFF” position. 
18. GENERAL PRECAUTIONS DURING NORMAL OPERATION 
a. If at any time this unit is necessarily disconnected from its 
power supply, make certain the power supply conforms to the re- 
quirements called for before reconnecting the equipment. 
b. Be sure the equipment is grounded before operation. 
c. Always keep the equipment in a level position during op- 
eration. 
d. Always try to fill the main reservoir tank with water which 
is as close to 65° F., as possible. This will result in less waiting 
time before the unit is ready for use. 
e. Do not operate the unit without water—a burned-out heater 
may result. 
/. Never attempt to raise or shift the entire unit by means of 
the handles on the base assembly. 
g. If for any reason the water level should drop below the top 
of the line intake pipe, or the unit is not maintaining the desired 
water temperature, open the heater and cooler switches to “OFF” 
position then open the air bleeder vent in accordance with para- 
graph 10/ before restoring the unit to normal operation. 
h. Check the water contents of the main reservoir tank for clear- 
ness and cleanness as the unit will not operate efficiently with dirty 
water. A complete change of water should be made at least once 
a week. 
Section VIII. OPERATION OF AUXILIARY EQUIPMENT 
19. GENERAL 
Medical item No, 9611700—X-ray Field Unit Processing Unit, Aux- 
iliary Wash Tank, and Medical item No. 9605500—X-ray Field 
Unit, Dryer and Loading Bin Combination: complete with Air 
Circulation: for Field Processing Unit are the only two auxiliary 34 
items used with the Processing Unit that this manual will discuss. 
They will be completely covered in part IV of this manual. 
20. EMERGENCY POWER SOURCE 
Often it is necessary to supply power to the Processing Unit from 
other than community sources. This may be accomplished by util- 
izing the Medical item No. 9606000 X-ray Field Unit, Generator, 
Gasoline Electric, or Engineers item No. 17-5403.500-000 Gener- 
ator Set, Portable, Gasoline-Engine Driven, Skid-Mounted 3KW, 
115-Volt, 1-phase, 60-cycle: Make and model unspecified, or other 
sources available if they can produce 2,500 watts of power at 110 
volts, single-phase, 60-cycle. 
Caution: In using Medical item No. 9606000 X-ray Field Unit 
Generator for the Army Field Processing Unit—no other item 
should he drawing power from this unit at the same time. It must 
be considered as a temporary emergency source of power only. 
Section IX. OPERATION UNDER UNUSUAL CONDITIONS 
21. SCOPE 
This section covers the exceptions or additions to instructions for 
normal operation (sec. VII) that will be necessary for operation 
under unusual conditions. 
22. EXTREME COLD 
It is obvious to the operator why this unit must not be exposed to 
extremely cold temperatures during operation, or when it is filled 
with water as the water may freeze. If the unit must be exposed 
to freezing temperatures, all water must be removed from the 
main tank and all parts of the circulating water system including 
the pump and mixing chamber. This may be accomplished by the 
following steps. 
a. Open all electrical circuits at the switch box by snapping 
them to the “OFF” position. 
b. If rapid draining is desired of the main reservoir tank, un- 
screw the 1-inch overflow drain at the left rear of the main reservoir 
tank. (See fig. 4 (2).) 
c. Close all valves conducting water from a community source 
into the unit and turn the calibrated inlet valve (fig. 12 (7)) to 
the “CLOSED” position. 
d. Open emergency drain valve (fig. 7 (14)) at lower left-hand 
of unit with No. 3 metal tag attached to drain pumping system. 
Note. Valve No. 3 (fig. 7(14)) is the master water drain valve to be used 
only when the equipment is to be subjected to freezing temperature and it is 35 
desired to drain all water from the entire system. It is not intended to be used 
for routine draining of the reservoir tank. When valve No. 3, is to be opened 
to drain the tank and system, connect it to the community drain piping. 
e. Open pet cock valve (fig. 7 (4)) on the underside of the mix- 
ing chamber also with a metal No. 3 TAG attached. 
23. EXTREME HEAT 
When it is necessary to use the Processing Unit under conditions 
of extreme heat, it is necessary to permanently remove the four 
screened sides from the base assembly to allow free circulation 
of air through the condenser (fig. 11 (4)) and around the compres- 
sor (fig. 11 (5)) and the water pump motor. (See fig. 7 (11).) 
24. SAND AND DUST 
a. During conditions of sand and dust, precaution must first be 
taken to keep foreign particles out of the developer, and fixer tank 
inserts and from the main reservoir tank primarily for good radio- 
graphic results. Secondarily, foreign particles must be kept from 
the recirculating water as they produce both a clogging and abrasive 
effect on the recirculating pump. 
b. Care must be exercised at all times to keep dust or dirt from 
clogging the condenser radiator (fig. 5 (1)), thereby causing poor 
circulation of air and inefficient operation of the cooling unit. 
25. DAMPNESS AND EXCESSIVE HUMIDITY 
a. The Processing Unit, although protected in part by insulating 
material, is subject to rust and corrosion because of inherent mois- 
ture from splash and drippage. This coupled with a humid or 
damp climate is extremely detrimental to the hour usage of this 
unit, 
b. It is recommended that under these conditions the four 
screened sides of the base assembly be permanently removed and 
close visual inspection of the equipment be maintained to see that 
it remains free from accumulated moisture on any base assembly 
metal parts. 
c. When a continued moisture condition exists on the equipment 
two steps are advisable. 
(1) Locate the equipment in as dry a place as is convenient on 
a raised wooden platform of about 4 inches under which air may 
circulate freely. 
(2) Wipe all metal parts in the base assembly with a dry rag 
first and then with an oiled rag to give them a protective coating 
of oil. This should be accomplished daily on all metal surfaces 
whether they are painted or unpainted. 36 
PART THREE 
MAINTENANCE INSTRUCTIONS 
Section X. GENERAL 
26. SCOPE 
Part Three contains information for the guidance of the personnel 
of the using organizations responsible for the maintenance (first- 
and second-echelon) of the Army Field Processing Unit. It con- 
tains information needed for the performance of maintenance 
services. 
Section XI. SPECIAL ORGANIZATIONAL TOOLS 
AND EQUIPMENT 
27. GENERAL 
No special tools are issued to the using organization with this 
equipment other than those covered in section III on tools, parts, 
and accessories. 
Section XII. LUBRICATION 
28. LUBRICATION 
See figure 15 for lubrication instructions on the Processing Unit. 
Section XIII. PREVENTIVE MAINTENANCE SERVICE 
29. GENERAL INFORMATION 
Preventive maintenance services as prescribed by Army Regula- 
tions are a function of using organizations echelons of maintenance. 
These services consist generally of: before, during, and after opera- 
tion services, and weekly services performed by the operator; as 
well as scheduled services performed by organizational maintenance 
personnel. 37 
HI ®=(s®si 
lLU Lyj uZjU 
WAR DEPARTMENT LUBRICATION ORDER 
14 OCTOBER 1944 
X-RAY PROCESSING UNIT, FIELD 
(WATER PUMP AND MOTOR, WESTINGHOUSE STYLES 981574 AND 980205) 
Reduce intervals under severe 
operating conditions. 
Requisition replacement Lubrication Orders from 
The Adjutant General. See lists in FM 21-6. 
Clean with solvent, dry cleaning 
or oil, fuel, diesel. 
DO NOT LUBRICATE — Refrigerant condenser fan motor. 
Water Pump 
check 
lubricant # Operating Hours 
Tighten to finger 
tightness. Refill as 
necessary. 
Motor 
3 drops 
-KEY- 
Armies (2); Corps (2); Depts (10); Sv C (51; 
ID 8 (4) (2); IB 8 (2) (II; 1R 8 (3) (2) 
(1); 1C 8 (2); Bose C (5); Numbered Air 
Forces (5); Med Deps, Continental (5) ex- 
cept St Louis Med Dep (50), I of Opn (10); 
PE (21; ASFTC Med (10). 
ID 8 (4): T/0 & 8-550. 
ID 3 (2): No T/0 & E Named Gen Hosp. 
IB 8(1); T/0 & E 8-611; 8-610. 
IB 8 (2); T/0 & E 8-520. 
IR 8 (3); T/0 & E 8-581; 8-580, Evac Hosp, 
1R 8 (2); T/0 8. E 8-560, 8-510; 8-590; 
8-572S. 
IR 8 (1): T/0 & E 8-580, Convol. Hosp. 
1C 8: T/0 & E 8-187, 8-667; 8-534; 
8-537T; Hosp Ship Co. 
For explanation of symbols, see FM 21-6. 
OE —Oil Engine SAE 10. 
WP—-Grease, water pump. 
Copy of this lubrication Order will remain with the equip- 
ment at all times; instructions contained therein are 
mandatory and supersede all conflicting lubrication in- 
structions dated prior to 14 October 1944. 
[A. G. 300.8 (14 October 1944)) 
BY ORDER OF THE SECRETARY OF WAR. 
C C MARSHALL, 
OFFICIAL Chef of Sialt. 
J. A ULIO, 
Major General, 
The Adjutant General. 
Figure 15. Lubrication Order 8-629 38 
30. OPERATOR MAINTENANCE (FIRST ECHELON) 
a. Before operation services. (1) If the unit has been dis- 
connected from its original power source, always make certain 
that the power supply conforms to the requirements called for be- 
fore connecting the equipment. 
(2) Always check the ground for proper connection before op- 
erating. 
(3) If the unit has been shifted, be sure it is in a level position. 
(4) Always try to fill the main reservoir tank with water which 
is as close to 65° F., as possible. This will result in less waiting time 
before the unit is ready for use. 
(5) Visually inspect around the unit to make sure it is free from 
debris so air may circulate freely. 
(6) Check lubrication of pump motor and water pump by refer- 
ring to the Lubrication Order 8-629. (See fig. 15.) 
Note. Never use excessive quantities of oil or grease as the water may 
become contaminated. 
(7) Check water pump shaft for leaks around pump packing if 
leaking tighten pump packing nut. (See fig. 7 (12).) In adjusting 
the pump packing nut to compensate for packing wear, do not 
tighten it to such an extent that it will cause overheating of the 
pump shaft. 
(8) Be sure the water requirement is satisfied by having the 
water level in the main reservoir tank to the top of the-4-inch 
overflow drain, otherwise a burned out heater may result. 
(9) The screen mesh strainers on top of the outlet and inlet 
water pipes should be examined and cleaned. Their purpose is to 
keep foreign materials out of the pump and other portions of the 
water circulating system, and they should be in place at all times 
while the unit is in operation. 
b. During operation services and inspection. (1) Make an 
occasional check of the water temperature in the main tank manu- 
ally with a suspended thermometer. 
(2) If for any reason the water level should drop below the top 
of the circulating water overflow pipe, or the unit is not maintain- 
ing the desired water temperature, open the air bleeder vent in 
accordance with paragraph 10/ after the requirement has 
been satisfied. 
(3) Observe all main reservoir tank to base assembly couplings 
for leakage. 39 
(4) Observe water pump shaft for water leakage. 
(5) Observe main reservoir tank for condensation to prevent 
sweat drippage onto the base assembly; if condensation does ap- 
pear wipe dry with a dry rag. 
(6) Occasionally observe recirculating pipe screen making sure 
it is clean and open. 
c. After operation service and inspection. (1) Wipe all 
condensation or drippage from the exterior of the main reservoir 
tank as well as from the base assembly mechanism. 
(2) Correct any leakage that became apparent during operation. 
(3) See the Lubrication Order 8-629 (fig. 15) and lubricate the 
unit, if necessary, according to the chart. 
(4) If the unit is to be exposed to freezing temperature, drain 
all water in accordance with paragraph 22. 
(5) Clean screen mesh strainers on recirculating overflow drain 
and on inlet pipe. 
d. Weekly service. (1) Clean out dust from the condenser 
radiator. (See fig, 5 (1).) 
(2) Wipe entire base assembly with a slightly oily rag to pre- 
vent corrosion and rust of metal parts whether painted or un- 
painted. L„) 
(3) Check pump packing on water pump (fig. 7 (12)) and re- 
place if necessary. 
(4) Clean the inse'rt tank and the main reservoir tank by scrub- 
bing and thoroughly flushing with fresh water. This is necessary 
because of the possible contamination of community water. 
.Vote. The film water racks and the film hanger adapters are silver plated 
and thus will discolor depending on conditions. This discoloration will have no 
effect on the parts and may be removed if desired by a mild silver cleaner, such 
as, powdered chalk and water. 
(5) Consult Lubrication Order 8-629 (fig. 15) and lubricate if 
necessary. 
31. ORGANIZATIONAL MAINTENANCE (SECOND ECHELON) 
a. Maintenance by using organization (second echelon) will con- 
sist of visual inspection for general cleanliness of the equipment, 
the checking of electrical contacts, water connections, fulfillment of 
lubrication requirements, and over-all operation. 
b. Certain minor adjustments and correction of trouble may also 
be accomplished by the organization as stated in section XIV on 
trouble shooting. 40 
Section XIV. TROUBLE SHOOTING 
32. GENERAL 
This section will not cover all troubles and their remedies as it is 
impossible to establish a “rule” for equipment becoming inopera- 
tive. Some of the following remedies will refer the equipment to a 
higher echelon, such as a fourth- or fifth-echelon maintenance and 
repair shops, as organizational tools, and equipment will not be 
adequate for major repairs. 
33. WATER DOES NOT COOL 
a. 
Possible causes 
NO POWER. 
Possible remedies 
(1) 
“Cooler” or “Line” switch 
open. 
Close switch. 
(2) 
Main line feed switch open. 
Close switch. 
(3) 
Blown fuse. 
Check for and replace. 
(4) 
b. 
Broken lead wire. 
No WATER CIRCULATION. 
Test and replace if necessary. 
(1) 
Water level below top of 
recirculating pipe. 
Turn off unit and proceed as in 
paragraph 10/. 
(2) 
Water valves not open or 
closed in accordance with 
instructions. 
See paragraph 10d or e. 
(3) 
Water pump motor not op- 
erating. 
Check for no power supply. 
Check for broken connections. 
Check “Line” switch. 
Check for too tight a setting of 
the pump packing nut. 
If burned out motor or broken 
pump impeller refer to higher 
echelon. 
(4) 
Water pump air bound. 
Follow the procedure as out- 
lined in paragraph 10/. 
If this fails to clear all trapped 
air out of the pump, remove 
both grease cups with pump 
still operating and insert a 
toothpick or small object into 
the bearing holes to break up 
grease. After all air has been 
removed, replace grease cups 
after referring to figure 15. 41 
Possible causes 
Possible remedies 
(5) 
Water pump clogged. 
Refer to higher echelon. 
c. 
Mixing chamber air bound. 
(1) 
Unit sucking air through 
Open air bleeder valve in ac- 
recirculation screen in- 
cordance with paragraph 10/. 
let because of improperly 
maintained water level. 
d. 
Sealed compressor motor not operating. 
(1) 
No power. 
Cooler or line switches open. 
Close. Check power source. 
(2) 
Thermostatic water tem- 
Clean and readjust contacts and 
perature control contact 
see paragraph 146. 
fails to open. 
(3) 
Relay not contacting prop- 
Clean and readjust contact. See 
erly on normally closed 
paragraph 14 h. 
contact. 
(4) 
Refrigerant pressure con- 
Clean and readjust contact. See 
trol contacts dirty, or not 
paragraph 14c. 
closing properly. 
(5) 
Starting capacitor burned 
out. 
Refer to higher echelon. 
(6) 
“Liquid line,” “suction 
Open valves as per paragraph 
line,” or “receiver” shut- 
10c. 
off valves not open. (This 
will cause refrigerant 
pressure control contacts 
to remain open.) 
(7) 
Refrigerant expansion 
valve stuck. 
Refer to higher echelon. 
e. 
Refrigerating unit not cooling. 
(1) 
Liquid line, suction line, or 
Completely open valves in ac- 
receiver valves only 
cordance with paragraph 10c. 
partly open. 
(2) 
Loss of refrigerant gas due 
to broken line or slow 
leak. 
Refer to higher echelon. 
/. 
Water temperature control not functioning. 
(1) 
Air in mixing chamber. 
Open air bleeder vent in ac- 
cordance with paragraph 10/. 42 
Possible causes 
Possible remedies 
(2) 
Thermostatic element de- 
Check setting of control with 
fective. 
thermometer immersed in 
main reservoir tank water. 
If confirmed, refer to higher 
echelon. 
(3) 
Moving contacts jammed. 
Remove cover and correct. 
34. WATER DOES NOT HEAT 
Heating element not operating. 
(1) 
No power. 
Heater or line switches open. 
Close. 
(2) 
Thermostatic water tem- 
perature control contacts 
fail to close or making 
poor contact. 
Correct in accordance with 
paragraph 14 5. 
K 
(3) 
Relay not contacting prop- 
erly on normally open 
contact. 
Adjust in accordance with para- 
graph 145. 
(4) 
Burned out relay coil. 
Refer to higher echelon. 
(5) 
Poor connection on heater 
terminals. 
Remove cap (fig. 5 (3)). Re- 
move wires, clean stud wires, 
and replace. 
(6) 
Heater elements burned 
out. 
Refer to higher echelon. 43 
PART FOUR 
AUXILIARY EQUIPMENT 
Section XV. DESCRIPTION AND DATA 
35. DESCRIPTION 
The major piece of auxiliary equipment which accompanies the 
Processing Unit is Medical item 9611700 X-ray Field Unit Process- 
ing Unit, Auxiliary Wash Tank. The Auxiliary Wash Tank (fig. 
16 (1)) with thermal pre-regulator (fig. 19) has been designed 
Med. Dept. No. Nomenclature 
1. Auxiliary wash tank assembled. 
2. Cypress wood tank. 
3. Pre-regulator bracket. 
4. Circulation valve tag No. 10. 
5. Community water source inlet tee tag No. 9. 
6. Inlet valve tag No. 11. 
Figure 16. Processing Unit and Auxiliary Wash Tank connected for operation. 44 
to operate in conjunction with the Processing Unit and to maintain 
a water temperature in the Auxiliary Wash Tank suitable for wash- 
ing films when a community water supply is used. 
a. Identification. The unit is shipped in two crates with the 
identifying marking of medical item number, manufacturer’s model 
number, manufacturer’s style number, cubic footage and weight, 
nomenclature, and whether part one or part two of a two part item. 
If the unit has been uncrated, it may be identified by the illustrations 
in this section of the manual. 
b. Difference in models. As with the Processing Unit the 
Auxiliary Wash Tank has been manufactured in two styles. It 
was first manufactured with steel main reservoir tank which is 
designated as the “old style.” (See fig. 2 (1).) The “new style” 
tank is constructed of cypress wood. (See fig. 16 (2).) 
36. TABULATED DATA 
a. Performances. The Auxiliary Wash Tank with pre-regulator 
coil in use has the capacity to cool 90° F., inlet water at least 10° F., 
with the rate of flow of 30 gallons of water per hour through the 
pre-regulator with master tank bath temperature of 65°. The inlet 
water upon passing through the pre-regulator coil immersed in the 
processing unit tank is normalized to a near ideal temperature. It 
then circulates through the Auxiliary Wash Tank passing by the 
films with a cascade effect because of tank baffles. 
b. Capacities. (1) The Auxiliary Wash Tank during normal 
operation will contain 55 gallons of water. 
(2) The maximum operating capacity of the Auxiliary Wash 
Tank is 60 gallons in flow per hour at 40 pounds per square inch 
water pressure. 
(3) Film capacities for this unit are limitless and controlled only 
by the physical size of the tank. 
37. TOOLS, PARTS, AND ACCESSORIES 
There are no tools, and parts furnished with the Auxiliary Wash 
Tank and only those accessories necessary in assembling the unit. 
The only tools necessary for the assembling of this unit are a cres- 
cent wrench to tighten the unions, a screw driver for the removal 
and replacement of the perforated side covers and the spanner 
wrench furnished with the Processing Unit to tighten base tank 
fittings. 45 
Med. Dept. No. Nomenclature 
1. Calibrated valve. 
2. Calibrated valve dial. 
3. Community drain tank coupling tag No. 2. 
4. Inlet tank coupling tag No. 4. 
5. Hose fitting tag No. 12. 
6. Pre-regulator tubing clamp to base. 
7. ' Pre-regulator tubing. 
8. Valve and fitting section clamp to base. 
9. Valve and fitting section. 
10. Community drain fitting tag No. 5. 
11. Auxiliary tank inlet coupling tag No. 7. 
Figure 17. The auxiliary wash tank base. 46 
38. OPERATING INSTRUCTIONS 
Note. Failure or unsatisfactory performance of equipment will be reported 
on WD AGO Form 468. 
Service upon receipt of new equipment is as follows: 
a. Uncrating. Place the crates in upright position near the 
location in which the unit will be installed. Remove all packing 
taking care not to pry against the contents, thereby causing damage. 
Examine all parts for possible damage. The complete apparatus 
consists of a base containing inner-connecting piping and a thermal 
pre-regulator disassembled in three parts and fastened in the base 
as shown in figure 17, union and hose fitting, part of which is fas- 
tened in the base, and upper tank containing baffles, six film hanger 
supports, a drip pan, one short inlet fitting with strainer, one plug, 
and one long community overflow drain pipe. |j|; 
b. Assembling. Examine figure 16 to obtain a picture of the 
appearance of the assembled unit. All water valves and connections 
are identified by means of numbered metal tags; other parts are 
identified on the illustrations. 
(1) Set the base in place beside the master film Processing Unit 
so that the calibrated valve (fig. 17 (1) and fig. 18 (6)) of the 
auxiliary base is facing the calibrated valve (fig. 18 (3)) of the 
Processing Unit and the two bases are approximately 11 inches 
apart. Never install the unit where it will be exposed to freezing 
temperature unless provision has been made to drain all water 
from the entire system. Also make sure the unit is in a reasonably 
level position. 
(2) Connecting two units. When the pre-regulator is to be used 
assemble as follows: Remove the section of valves and fittings on 
which are attached TAGS No. 8, 9, and 11 from the base by loosen- 
ing the clamps (fig. 17 (8)) holding it in place. This section con- 
nects between figure 18 (5) and figure 18 (4) which is the Auxili- 
ary Tank inlet and Processing Unit inlet, respectively. Connect the 
untagged end of this section, which is opposite to the end tagged 
No. 8, to the Processing Unit inlet union which is tagged No. 4 
(fig. 18 (4)) after removing the hose fitting and collar and tail 
part of the union tagged No. U. (See fig. 13 (1).) Caution must 
be exercised here as this union contains the orifice of the Processing 
Unit and this orifice or the suitable orifice must be placed in the 
union collar of this pre-regulator section being joined to the union 
part tagged No. 4. Now position the base of the Auxiliary Unit so 
that the end of the section with the half union tagged No. 8 (fig. 19 
(2)) can be joined to the Auxiliary Tank inlet union tagged No. 7 47 
Med. Dept. No. Nomenclature 
1. Auxiliary tank base. 
2. Tie rod nuts Vi x 13. 
3. Processing unit calibrated valve. 
4. Processing unit inlet coupling. 
5. Auxiliary Tank inlet coupling tag No. 7. 
6. Calibrated valve. 
7. Auxiliary master drain valve tag No. 3. 
Figure 18. Respective position before connecting units. 
(fig. 17 (11)) and join them. The Processing Unit base and Auxili- 
ary Tank base are now connected. 
(3) Assembling pre-regulator. Remove the heat exchange sec- 
tion of the pre-regulator from the base by loosening clamps (fig. 17 
(6)) and by means of its brackets or rack hang, this section on the 
front side of the main reservoir tank of the Master Film Processing 
Unit (fig. 16 (8)) so that the pre-regulator is immersed in the 65° 
F., water bath of the Processing Unit tank. The connecting tubes 
of the pre-regulator should now protrude over and down the for- 
ward part of the left end of the master tank. The pre-regulator is 
made up for use with either a wood type tank or a stain- 
less steel type tank. As the pre-regulator comes from the fac- 48 
Figure 19. Thermal pre-regulator assembled and drip pan. Med. Dept. No. Nomenclature 
1. Inlet valve tag No. 11. 
2. Auxiliary tank connection tag No. 8. 
3. Heat exchanger union. 
4. Thermal pre-regulator heat exchanger section. 
5. Drip pan. 
6. Pre-regulator tubing connection. 
7. Circulation valve tag No. 10. 
8. Inner connecting tubing Processing Unit to Auxiliary 
Wash Tank unit. 
9. Processing unit connection. 
10. Community water source inlet tee tag No. 9. 
Key to Figure 19 50 
tory, it is dimensioned for use with a wood type of master tank. 
However, if it is to be used with stainless steel tank, then the two 
Yu-inch brass nipples, 3 inches long, located just above and con- 
nected to the unions at the extremities of the heat exchanger section 
(fig. 19 (3)) must be replaced by the shorter nipples attached to 
these in an envelope. 
(4) Assembling pre-regulator to base connections. Remove the 
straight double length of tubing containing union parts on each 
end from the base (fig. 17 (7)) and using this, connect the two sec- 
tions of the pre-regulator covered in (2) and (3) above. The pre- 
regulator is now completely assembled and connections have been 
made at parts (2), (3), (6), and (9) of figure 19. Make sure these 
connections are watertight as they are all ground joint union 
connections. 
(5) Inspecting and placing tank. Screw the long 1-inch over- 
flow pipe into its fitting in the right front corner of the auxiliary 
tank. Be sure the %-inch plated brass plug is in its fitting along 
side of the 1-inch pipe. The remaining inlet fitting should contain 
a %-inch unplated brass plug. Fill the tank full of water and ob- 
serve for leaks. If leaks are observed, allow the tank to set so as 
to swell tight. After leaks have stopped, drain the tank and replace 
the unplated brass plug with the short screened inlet pipe. Do not 
use a wrench on these parts—they should be fastened handtight 
only—except if necessary on the plated plug. See that the paper 
tubing thread protectors are removed from the ends of the inlet 
and outlet fittings in the base of the wood tank. Carefully place 
the main reservoir tank in place on the base with the nameplate to 
the front. 
Caution: Do not tighten the tie rod nuts (fig. 18 (2)) on the tank 
except if the tank still leaks after it has swelled. Only tighten 
enough to stop a leak as it is possible to crush the tank. 
(6) Connecting tank to base. Connect tank coupling tagged 
No. 1 (fig. 17 (4)) to the short, screened tank inlet fitting on the 
left rear. Connect tank coupling tagged No. 2 (fig. 17 (3)) to tank 
outlet fitting containing the long 1-inch overflow pipe. 
(7) Plumbing in community supply and drain. Connect com- 
munity drain piping to fitting tagged No. 5 (fig. 17 (10)) on lower 
end of 1-inch overflow pipe. 
Note 1. Valve tagged No. 3 (fig. 18 (7)) is the master drain valve of the 
Auxiliary Unit to be used only when the equipment is to be subjected 
to freezing temperatures, and it is desired to drain all water from 
the entire system. It is not intended to be used for routine draining 
of the Auxiliary Tank. When valve tagged No. 3 is to be opened to 
drain the tank and system, connect it to the community drain piping. 51 
Connect community cold-water supply to the tee tagged No. 9 (fig. 
16(5) and fig. 19(10)) by means of the hose fittings attached to union 
tagged No. 12 (fig. 17 (5)) located on base platform of Auxiliary Tank. 
Close drain valve tagged No. 3. Close the pre-regulator valve tagged 
No. 10. Close the valve tagged No. 11. Close the calibrated valve in 
the Auxiliary Tank base. 
2. All water valves close in a clockwise direction. Do not use excessive 
force when operating the calibrated valve or the accuracy of the cali- 
bration may be affected. Turning it gently to the “closed” position 
will effectively shut off all water flow. 
(8) Drip pan. Place the drip pan (fig. 19 (5)) so as to con- 
nect between the Auxiliary Tank and Processing Unit tank. 
(9) Operation. After the Army Processing Unit is in operation 
the Auxiliary Tank and Thermal Pre-regulator are ready to be put 
into operation. The “Caution” plate on the front of the Auxiliary 
Tank should be heeded. 
39. SERVICE UPON RECEIPT OF USED EQUIPMENT 
The procedure outline in paragraph 38 should be followed in assem- 
bling used equipment. In addition, a thorough visual inspection 
should be made of the unit and piping. 
40. CALIBRATED WATER VALVE 
The valve located in the front right-hand corner of the Auxiliary 
Tank base (fig. 17 (1) and fig. 18 (6)) provides a convenient means 
for controlling the flow of water in the Auxiliary Tank. 
a. It is calibrated in gallons of water flow per hour for different 
water pressure. 
b. The valve dial is graduated up to 60 gallons inflow per hour 
at 40 pounds per square inch water pressure. 
c. To obtain the rate of flow at lower water pressures, multiply 
the dial reading by the correctionactor for the respective pres- 
sure. The correction factors for 10, 20, and 30 pounds pressure 
are given on the face of the dial. (See fig. 17 (2).) 
d. To shut off the flow of community water into the tank, set the 
index pointer of the valve dial to the “closed” position. 
41. OPERATION UNDER USUAL CONDITIONS 
a. Operation. Before the Auxiliary Unit is placed in opera- 
tion, temperature reading of the community water supply should 
be made; this temperature reading should be determined only after 
the water has had sufficient time to discharge from the pipe and 
give a true reading which will continue. If the reading is from 60° 
to 80° Fahrenheit, it is not necessary to use the pre-regulator coil 52 
and the unit should be operated as in b below. However, should the 
temperature read below 60° Fahrenheit or above 80° Fahrenheit 
upon admittance to the unit, the pre-regulator should be put into 
service as described in c below. 
b. Community water source 60° to 80° Fahrenheit. (1) 
Set the calibrated valve in the front right-hand corner of the Aux- 
iliary Tank base (fig. 18 (6)) to the gallons of water flow per hour 
desired. 
(2) Open valve tagged No. 11. (See fig. 16 (6) and fig. 19 (1).) 
(3) Close valve tagged No. 10. (See fig. 16 (4) and fig. 19 (7).) 
(4) If it should be found desirable not to use the pre-regulator 
and its piping at all because it is known that the community water 
supply will be at the proper temperature while using the Auxiliary 
Tank, then a direct water supply connection can be made to inlet 
coupling tagged No. 7. (See fig. 17 (11).) To do this, remove the 
collar and flange part of the union tagged No. 12 (fig. 17 (5)) lo- 
cated on the base platform and attached to inlet coupling tagged 
No. 7 making a complete union. Into this union screw the hose 
fitting adapter which was located either in the union part tagged 
No. 12 (fig. 17 (5)) or the water inlet tagged No. 9. (See fig. 19 
(10).) 
C. COMMUNITY WATER AT UNDESIRABLE TEMPERATURE. (1) Close 
valve tagged No. 11. (See fig. 16 (6) and fig. 19 (1).) 
(2) Open valve tagged No. 10. (See fig. 16 (4) and fig. 19 (7).) 
(3) The pre-regulator is now in use and the calibrated valve 
will read slightly higher due to water pressure losses in passing 
through the pre-regulator. 
42. OPERATION UNDER UNUSUAL CONDITIONS 
If the Auxiliary Wash Tank is to be used under unusual conditions 
as outlined in section IX, the same precautions should be taken 
where they comply. To drain this unit follow the instructions in 
paragraph 44a. 
43. MAINTENANCE INSTRUCTIONS 
a. Preventive maintenance. (1) When the Auxiliary Tank 
is filled with water examine the coupling underneath the tank as 
well as other parts of the water system for leaks. 
(2) Keep the Auxiliary Wash Tank and base dry and free from 
drippage and condensation at all times where water does not come 
in actual contact with the unit. 
b. Weekly services. (1) Drain tank. 53 
(2) Scrub and flush wood tank. This is necessary because of 
the possible contamination of community water. 
(3) If it is desirable, remove the discoloration of the film hanger 
adapters and pre-regulator coil. However, this coloration will have 
no harmful effect on the parts as they are silverplated and will 
naturally discolor because of the conditions. 
c. Semiannual services. (1) Perform services as specified 
for preventive maintenance and weekly services and thoroughly 
inspect the unit. 
(2) Constant use of the calibrated water valve over long periods 
of time may ultimately result in the introduction of slight inaccura- 
cies due to normal wear of the valve seat. If this should occur make 
the necessary corrections. 
44. MAINTENANCE OPERATION 
a. To drain tank. (1) Remove the left and perforated base 
cover. 
(2) Close valves tagged No. 10 (fig. 19 (7)) and tagged No. 11 
(fig. 19 (1)) and open the calibrated valve of the Auxiliary Unit. 
(See fig. 17 (1).) 
(3) Unscrew the long, 1-inch diameter overflow pipe in the Aux- 
iliary Tank in a counterclockwise direction. This will allow the 
water in the two right-hand compartments to flow into the com- 
munity drain. 
(4) Connect the drain valve tagged No. 3 (fig. 18 (7)) to com- 
munity drain. Now carefully unscrew only the upper front union 
located on the pre-regulator piping between the two wood tanks. 
(See fig. 19 (3).) 
Note. Hold a small container under this union when unscrewing it so as to 
catch any water in the short vertical length of piping above it which may drain 
out. 
(5) Now open drain valve tagged No. 3 (fig. 18 (7)) in the 
Auxiliary Tank base and the water in the left-hand compartment 
of the wood tank, the pre-regulator, and the piping in the base of 
the Auxiliary Unit will drain off. If air gets into the pre-regulator 
coil it will not completely drain as it will not siphon off. The water 
. can be removed by blowing in one end. 
(6) There will be some water left in the section of piping be- 
tween the two tanks. This may be drained off if desired by closing 
the community supply line valve and the calibrated valve of Process- 
ing Unit (fig. 18 (3)) and opening valves tagged No. 10 and No. 
11. The only water left in the system will now be in the Processing 
Unit. (For draining the Processing Unit, see par. 22.) 54 
b. To CLEAN tank. (1) After water has been removed from 
the tank, scrub vigorously with a bristle brush. 
(2) Flush the tank thoroughly with fresh water. 
C. To REMOVE DISCOLORATION FROM FILM HANGER ADAPTERS AND 
PRE-REGULATOR COIL. Use a mild silver cleaner such as powdered 
chalk and water. 
d. To CORRECT INACCURACIES OF CALIBRATED VALVE. (1) Slowly 
turn the valve wheel in a clockwise direction until the flow of com- 
munity water just stops. Do not turn past this point by the use of 
excessive force. 
(2) Loosen the four screws located on the inner circumference 
of the calibrated dial. This will permit the dial to turn. 
(3) Turn the calibrated dial (fig. 17 (2)) until the word “closed” 
is directly under the index pointer on the valve wheel. 
(4) Tighten all four screws, being careful not to upset the ad- 
justment. 
45. SHIPMENT AND STORAGE 
Disassembly, draining, and preparation of unit for transit is 
as follows: 
a. Remove the four perforated side covers from the base. 
h. Drain the unit of all water as explained under paragraph 44a. 
In addition, close the community wTater supply line valve and the 
calibrated valve on the Processing Unit. Open valves tagged No. 
10 and 11 to drain off any water left in this section of piping. Dis- 
connect the community water supply. 
c. After all the residual water has drained from the Auxiliary 
Tank unit and the pre-regulator close the valves tagged No. 3, 10, 
and 11. 
d. Disconnect the pre-regulator and its connecting piping by 
unscrewing the unions (fig. 19 (3) and (6)) which are at the ex- 
tremities of the straight vertical length of the double piping. Dis- 
connect the unions at each end of the piping (fig. 19 (2) and (9)) 
containing valves tagged No. 10 and No. 11 which connects between 
the Processing Unit end and the Auxiliary Unit. 
e. Disconnect the two Auxiliary Wood Tank couplings tagged 
No. 1 and No. 2. (See fig. 17 (4) and (3).) 
/. Lift the Auxiliary Wood Tank from its base. 
g. Fasten the three sections of the pre-regulator and piping in 
the base by means of the brackets and clamps provided as shown 
in figure 17. 
h. Replace the four perforated side covers on the base. The 
unit is now ready for packing and transportation. 55 
Section XVI. X-RAY FIELD UNIT, DRYER AND LOADING BIN 
COMBINATION: COMPLETE WITH AIR CIRCULATOR. 
FOR FIELD PROCESSING UNIT 
46. DESCRIPTION AND DATA 
The second piece of auxiliary equipment which often accompanies 
the Processing Unit is Medical item No. 9605500 X-ray Field Unit, 
Dryer and Loading Bin Combination, with Medical item No. 9605600 
X-ray Field Unit, Dryer and Loading Bin Combination, Hot Air 
Duct: 7 
a. General information. Item No. 9605500 (fig. 20) is in- 
tended for evacuation hospitals, general hospitals, and station hos- 
pitals. Occasionally it may be needed for use in a truck. It is 
Med. Dept. No. Nomenclature 
1. Knock out hole for electrical connection. 
2. Discharge side. 
3. Protective fan grill. 
4. Exhaust fan. 
5. Location of upper section lock. 
6. Drying rack. 
Figure 20. Exhaust side view of dryer and loading bin combination. 56 
Med. Dept. No. Nomenclature 
1. Floor loading shelf. 
2. Knock out hole for electrical connection. 
3. 9R07212 BLOCK, FUSE: 
4. Switch block. 
5. Loaded cassette compartment. 
6. Upper section. 
7. Film storage compartment, 
8. Lower section. 
Figure 21. Front view upper section exposed. 57 
easily portable, being composed of two sections with three com- 
partments. 
(1) The upper section (fig. 21 (6)) is completely lead-lined, so 
as to afford protection against X-radiation. It consists of two com- 
partments, a film storage compartment occupying the right half 
(fig. 21 (7)) and loaded cassette compartment occupying the left 
half. (See fig. 21 (5).) Racks have been provided in each of these 
two compartments to accommodate the three standard dimensions 
of X-ray films in use by the United States Army: 8- x 10-inch, 
10- x 12-inch, and 14- x 17-inch films. 
(2) The lower section (fig. 21 (8)) of the unit contains a drawer 
type of drying rack (fig. 22 (2) and fig. 20 (6)), four heater strips 
(fig. 22 (4) and fig. 23 (1)), exhaust fan (fig. 20 (4) and fig. 23 
Med. Dept. No. Nomenclature 
1. 9R07208 PAN, DRIP: 
2. Drying rack. 
3. 9R07206 LATCH: 
4. 9R07210 HEATER STRIP: 
Figure 22. Heater strip and air intake view. 58 
(3)), fan motor (fig. 23 (2))with capacitor (fig. 23 and (9)), 
floor loading shelf (fig. 21 (1)) drip pan (fig. 22 (1)), switch block 
(fig. 21 (4) and fig. 23 (5)) and fuse block (fig. 21 (3) and fig. 
23 (7)). 
b. Identification information. The unit is usually shipped 
as a one part item assembled as in figure 20; the crates will be 
marked with item number, nomenclature, weight and cubage. 
(1) If the unit is shipped uncrated it may be identified by the 
illustrations in this section. 
(2) This unit has been constructed either with right or left ex- 
hausts. The performance and operation of the unit is not changed. 
c. Data. (1) Performance. The unit drys film when placed in 
the lower section by means of an exhaust fan (fig. 20 (4)) which 
draws heated air through the lower section. This air is heated by 
means of four electrical resistance type heater strips installed on 
the lower section (fig. 22 (4)) opposite the exhaust fan. 
(2) Capacities. The storage of film in the upper compartments 
is limited only by the physical size of the film stored in the unit. 
The lower compartment drying rack has accommodations for 18 
films (as suspended on standard film hangers). 
47. OPERATING INSTRUCTIONS 
a. This part contains information for the guidance of the per- 
sonnel responsible for the operation of this equipment. It contains 
information on the operation of the equipment with the description 
and location of controls. 
Note. Failure or unsatisfactory performance will be reported on WD AGO 
Form 468. 
b. Service upon receipt of new equipment. The unit should 
be carefully uncrated and inspected for any damage. 
(1) Place the unit where it is to be used, keeping in mind the 
discharge of warm moist air from the discharge side (fig. 20 (2)) 
of the unit. It is unwise for the discharge of the air to be contained 
within the same room where the unit is installed. It is therefore 
necessary to often use a hot air duct as shown in figure 24, and pipe 
the exhaust air to the outside. 
Note. Visually inspect the unit to determine which side of the lower section 
contains the exhaust fan as it may be either side of the unit, 
(2) Make electrical connections. Run a line carrying 110-volt, 
60-cycle, single-phase, AC through the knock-out holes (fig. 20 (1) 
and fig. 21 (2)) and connect the incoming line (fig. 23 (8)) to the 
two terminals on the bottom side of the fuse block (fig. 21 (3) and fig. 23 (7)) one terminal and fuse being used as ground and the 
other terminal and fuse being used as the “hat” side of the line. 
Note. The heater strips are connected in parallel with the fan switch 
thereby making it impossible to energize the heater strips without first closing 
the exhaust fan motor circuit. 
Med. Dept. No. Nomenclature 
1. 9R07210 HEATER STRIP: 
2. Fan motor. 
3. Exhaust fan. 
4. 9R07204 SWITCH: (Exhaust fan motor switch). 
5. Switch block. 
6. 9R07204 SWITCH: (Heater switch). 
7. 9R07212 BLOCK, FUSE: 
8. Incoming line. 
9. 9R07202 CAPACITOR, MOTOR: 
Figure 23. Wiring diagram. 
c. Preoperative procedure. (1) The exhaust fan motor switch 
(fig. 23 (4)) when placed in the “ON” position should energize 
the fan motor and the fan should be immediately set in motion. 
This also closes the circuit to the “Heater Strips” switch. 
(2) The heater switch (fig. 23 (6)), when placed in the “ON” 
position, should energize the four heater strips and within a few 
seconds they should be warm to the touch. The heater strips may 
only be energized after the exhaust fan motor is energized. 
(3) The door latches (fig. 22 (3)) of the upper section should 
be checked to see that they operate freely and hold the doors closed 
securely. 60 
(4) The top of the upper section should be wiped clean and dry 
as it may be used as a film loading bench. 
d. Service upon receipt of used equipment. A thorough vis- 
ual inspection of the entire unit should be made and the same pro- 
cedure followed as outlined in b and c above. 
48. CONTROLS 
The only two controls of this unit are the switches located in the 
upper left-hand corner (fig. 21 (4)) of the unit, one of which will 
control the exhaust fan, the other the heater strips. 
49. OPERATION UNDER USUAL CONDITIONS 
Care should be exercised to keep the unit clean and dry at all times 
as the humidity caused by the damp film as well as film drippage 
often creates a condition of rust and deterioration of the unit. The 
“ON” and “OFF” operation of this unit remains the same as was 
stated in 47c. 
50. MAINTENANCE INSTRUCTIONS 
The two grease cups on the fan motor should be tested to finger- 
tightness weekly, and filled with Grease, general-purpose No. (CG) 
semiannually. 
51. TROUBLE SHOOTING 
a. Heater elements inoperative. 
Possible causes 
Possible remedies 
(1) 
Fuse blown. 
Check fuse block and replace 
fuse if necessary. 
(2) 
Switch inoperative. 
Check heating element switch 
and if inoperative, replace. 
(3) 
Heating element burned 
out. 
Refer to higher echelon. 
(4) 
Faulty wiring. 
Check for continuity with wir- 
ing diagram, figure 23. 
b. Exhaust fan inoperative. 
Possible causes 
Possible remedies 
(1) 
Fuse blown. 
Check fuse block and replace 
fuse if necessary. 
(2) 
Switch inoperative. 
Check heating element switch 
and if inoperative, replace. 
(3) 
Motor capacitor burned 
out. 
Refer to higher echelon. 61 
Possible causes 
Possible remedies 
(4) 
Exhaust fan motor burned 
out. 
Refer to higher echelon. 
(5) 
Faulty wiring. 
Check for continuity with wir- 
ing diagram, figure 23. 
c. 
Storage and loading bin latches inoperative. 
Possible causes 
Possible remedies 
(1) 
Spring broken or tension 
lacking. 
Replace with new latch. 
d. 
Drip pan unusable. 
Possible causes 
Possible remedies 
(1) 
Rust and corrosion. 
Replace. 
52. AUXILIARY EQUIPMENT 
If it is necessary to install the unit in a place where the exhaust air 
is to be carried to the outside use Medical item No. 9605600 X-ray 
Field Unit, Dryer and Loading Bin Combination, Hot Air Duct. 
This item should be requisitioned and installed as shown in figure 
24, so that it protrudes through a wall or separating section. 
Med. Dept. No. Nomenclature 
1. 9605600 HOT AIR DUCT: 
2. Recesses for engaging arms of upper section. 
Figure 2U. Dryer unit and hot air duct connected. Note. To install the hot air duct loosen the retainer screws that hold the 
protective fan grill (fig. 20(3)) and without removing the grill slip the hot air 
duct under the discharge side cut-out and tighten the retainer screws. 
53. STORAGE AND SHIPMENT 
a. If it is advisable because of weight and cubage factors to ship 
the unit in two parts (upper section and lower section separated), 
this may be done as follows: 
(1) Open the lower compartment rack door and reach in and 
under the top of the lower compartment and release a spring type 
latch located in a corresponding position under the arrow in figure 
20 (5). 
(2) Raise the upper section front about 4 inches and pull for- 
ward to disengage the two small arms which fit into the top of the 
lower section. (See fig. 24 (2).) 
(3) Remove the line wiring to the unit as well as the exhaust 
duct if one has been used. 
(4) The unit is now ready for shipment in two sections. 
h. The unit should be thoroughly cleaned and dried before 
crating. 63 
PART FIVE 
REPLENISHMENT OF DICHLORODIFLUOROMETHANE 
(FREON, F 12) REFRIGERANT GAS 
IN REFRIGERATION SYSTEM OF ARMY FIELD 
PROCESSING UNIT 
Section XVII. GENERAL 
54. INDICATION OF LOW GAS (F 12) PRESSURE 
Continual starting and stopping or continual running of the com- 
pressor motor are the only two reliable indications of a lack of 
Freon (F 12) in the refrigeration system. This is due to the in- 
ability of the compressor to build enough gas pressure, so that it may 
be held for any length of time in the bellows of the refrigerant 
pressure control. (Seefig.il (7).) 
Note. Replenishment of F 12 in the Army Field Processing Unit will only 
be performed by fourth- or fifth-echelon repair shops or installations. 
Section XVIII. EQUIPMENT AND TOOLS 
55. GENERAL 
A small number of tools and amount of equipment is necessary for 
adding F 12 from the cylinder (fig. 25 (17)) to the refrigeration 
system of the Processing Unit. These special tools and equipment 
are shown in figure 25. The equipment and tools may be drawn 
by the fourth- or fifth-echelon shops on requisitions for spare parts 
submitted in accordance with latest ASF Supply Catalog MED 7. 
56. TOOLS 
a. All tools listed in paragraph 5 will be needed. 
b. In addition to the above tools supplied with the Processing 
Unit, the following are also required and may be drawn on requi- 
sitions. 
(1) A tube cutter tool. (See fig. 25 (24).) 
(2) Tube flaring tool size 14-inch, (See fig. 25 (25),) 
(3) A refrigerant leak detector torch (Halid Lamp). (See fig. 
25 (26).) Figure 25. Tools and equipment unassembled. 65 
Med. Dept. No. Nomenclature 
1. SR01143 COUPLING, MALE, V4-INCH TUBING TO Vs-INCH PIPE: 
2. SR01144 NUT, UNION, TUBING, ’A-INCH: 
3. SR00782 TUBING, ’/.-INCH, COPPER: (3 feet) 
4. SR01144 NUT, UNION, TUBING, ’A-INCH: 
5. SR01146 TEE, TUBING, ’/.-INCH: 
6. SR01144 NUT, UNION, TUBING, ’A-INCH: 
7. SR00782 TUBING, ’A -INCH, COPPER: (3 inches) 
8. SR01144 NUT, UNION, TUBING, ’A-INCH: 
9. SR01147 COUPLING,’A-INCH INSIDE PIPE THREAD TO’A-INCH 
TUBING: 
10. SR01149 GAUGE, FREON, ’A-INCH NPT, 30-INCH VACUUM 
TO 150 LB; 
11. SR01144 NUT, UNION, TUBING, ’/,-INCH: 
12. SR00782 TUBING, ’/.-INCH, COPPER; (3 inches) 
13. SR01144 NUT, UNION, TUBING, ’A-INCH: 
14. SR01148 ADAPTER, %-INCH CYLINDER FITTING TO ’A-INCH 
TUBING: 
15. Cylinder outlet cap. 
16. Cylinder cap. 
17. 9R20008 GAS, F 12, 25 LB DRUM: 
18. SR01150 GAUGE, PRESSURE, ’A-INCH NPT, 0 TO 300 LB: 
19. SR01147 COUPLING, ’A-INCH INSIDE PIPE THREAD TO ’A- 
INCH TUBING: 
20. SR01144 NUT, UNION, TUBING, ’A-INCH: 
21. SR00782 TUBING, ’A-INCH, COPPER: (1 foot, 6 inches) 
22. SR01144 NUT, UNION, TUBING, ’A-INCH: 
23. SR01143 COUPLING, MALE, ’A-INCH TUBING TO ’A-INCH PIPE: 
24. TR02610 CUTTER, TUBING, ’A-INCH TO SA-INCH RANGE: 
25. TR02620 FLARING TOOL, ’A-INCH TO ’A-INCH TUBING: 
26. TR00043 LEAK DETECTOR, REFRIGERANT, PROCESSING UNIT: 
Key to Figure 25 66 
57. EQUIPMENT 
a. Gauges required. (1) One standard pressure gauge 0 to 
300 pounds (fig. 25 (18)) is needed to test Freon head pressures 
at the receiver tank. (See fig. 11 (1).) 
(2) One compound Freon gauge (fig. 25 (10)) which will show 
a minimum of 30 inches vacuum and a minimum of 60 pounds 
pressure is required to read the suction and pressure on the suction 
side of the refrigeration system. (See fig. 11 (6).) 
b. Five feet of 1/4-inch copper tubing is required cut into the 
following lengths: 
One piece, 3 feet in length. (See fig. 25 (3).) 
Two pieces, each 3 inches in length. (See fig. 25 (7) and 
(12).) 
One piece, 1 foot and 6 inches in length. (See fig. 25 (21).) 
c. Eight union nuts for flared copper tubing. (See fig. 
25 (2), (4), (6), (8), (11), (13), (20), and (22).) 
d. Two half unions or male couplings, tube O.D. size *4-inch, 
I.P.T. size i/g-inch. (See fig. 25 (1) and (23).) 
e. Two female couplings, tube O.D. size I.P.T. size *4- 
inch. (See fig. 25 (9) and (19).) 
/. One three way tee union coupling, tube O.D. size 
(See fig. 25 (5).) 
g. One cylinder reducing adapter %-inch pipe to 14-inch tubing. 
(See fig. 25 (14).) 
h. One cylinder dichlorodifluoromethane (Freon, F 12). (See 
fig. 25 (17).) 
Section XIX. REPLENISHMENT PROCEDURE 
58. CONNECTING TANK GAUGES AND EQUIPMENT 
a. Cut the tubing into the proper lengths and lay out all tubing, 
fittings, and gauges as shown in figure 25. Place the flare nuts on 
the corresponding tubing. Flare the tubing and join all parts of 
the equipment solidly as shown in figure 26, so that no gas may 
escape. 
Note. Do not at this point join the tubing assemblies to the equipment. 
b. Close the receiving tank valve. (See fig. 11 (1).) (All re- 
frigerant valves on this unit are back seating and must be turned 
clockwise to close before the studs are removed to make a tubing 
connection.) With the valve closed, remove the cap and stud, and 
screw the receiver tank gauge assembly in tightly. (See fig. 26 
(1) and (2).) Now crack the joint at the gauge by unscrewing 
the gauge slightly in its fitting. Turn the receiver tank valVe counterclockwise slightly to purge the gauge assembly line of all 
air. As soon as the gauge assembly tubing feels cool to the touch, 
quickly screw the gauge into its fitting and make sure that all 
connections are gastight and the gauge is reading the pressure 
within the receiving tank. Now open the valve completely so that 
it back seats. 
Med. Dept. No. Nomenclature 
1. Assembly, receiver tank to gauge. 
2. SR01150 GAUGE, PRESSURE, ’A-INCH NPT, 0 TO 300 LB: 
(Receiver tank head pressure gauge). 
3. Connection, suction line to gauge assembly. 
4. Assembly, cylinder to unit. 
5. SR01149 GAUGE, FREON, 'A - INCH NPT, 30-INCH VACUUM TO 
150 LB: 
6. Connection, cylinder to gauge assembly. 
Figure 26. Refrigeration unit with receiver tank gauge and cylinder gauge 
assemblies connected. 
c. Purging system of any air. With the unit disconnected and 
not operating turn the base assembly on end so that the condenser 
radiator (fig. 5 (1)) is down; this will place the receiver tank in a 
horizontal position and any air trapped in the receiver tank will 
work out of the liquid or gaseous refrigerant to the top of the tank, 
as air is lighter than Freon. After the unit is in this position and 
has been inoperative for from 20 minutes to hour, the receiver 
gauge assembly may be cracked at the gauge slightly to allow any 
air to escape. Once again when the line becomes frosty or cool to 
the touch, quickly tighten the gauge making the line gastight. 68 
(1) Another method to detect air in the refrigerant system 
trapped in the receiver tank is by the use of a Halid Lamp following 
the above procedure and taking a reading with the lamp where the 
gauge has been cracked to allow air and refrigerant to escape. (For 
use of Halid Lamp see par. 61.) 
Caution: Care should be exercised in the purging of refrigerant 
lines to make sure, first, that the system and line is purged of all 
air, and second, that too much refrigerant is not lost in the process. 
(2) After the unit has been purged of air, place it in an upright 
position. 
d. Make sure the valve on the Freon (F 12) cylinder is tightly 
closed, then remove the two protective caps. (See fig. 25 (15) and 
(16).) Now connect the cylinder adapter (fig. 25 (14)) to the 
cylinder, then connect the assembled line and gauge to the adapter. 
(See fig. 26 (6).) Close the suction line valve and remove the cap 
and stud (fig. 11 (6)) and connect the cylinder unit assembly into 
this valve leaving the joint at the unit slightly cracked. Slowly 
open the cylinder valve to purge the cylinder to unit line. When 
the cracked joint is frosted or cool to touch, quickly close the cylin- 
der valve and immediately tighten the connections at the unit. Then 
open the suction line valve. 
e. Set the compressor in operation and check all connections in 
the entire unit for leaks with the refrigerant gas detector torch 
(Halid Lamp). (See par. 61.) 
Caution: If the unit is not connected so that water runs through 
the mixing chamber, make sure the heater switch is in the “OFF” 
position. If there is no heater switch on the unit, disconnect the 
heater terminals so that the heater can not possibly burn out. 
Note. The F 12 cylinder should always remain in an upright position so 
that only gas may get into the line when the unit is being charged, as the charg- 
ing is done through the suction and return valve, and if liquid refrigerant gets 
into this valve it will be sucked into the compressor burning out the compressor 
motor and damaging the compressor valves. During charging of the unit the 
F 12 cylinder should be heated preferably by placing it in a pail of hot water. 
59. CORRELATING TEMPERATURES AND PRESSURES 
a. Take a temperature reading of the air directly over the con- 
denser with an ordinary thermometer and refer to the chart on 
“operating discharge pressures” which follows, using only the “air 
temperature over condenser column” which corresponds closest to 
the reading you have made of the air temperature. 
b. Take a reading of the receiver tank gauge (fig. 26 (2)) and 
find this reading in the correct column on the right-hand side of 
the chart. 69 
Chart for operating discharge pressures—Ibs./sq. in. (gauges) 
Air temperature over 
condenser 
Suction pressure Ib/sq. in. 
(gauge) 
70° 
80° 
90° 
100° 
110° 
- 
Receiver tank pressure lb (gauge) 
0 . 
89 
103 
121 
141 
162 
2 ___ 
92 
107 
124 
144 
165 
4 .. 
95 
110 
127 
148 
168 
6 
98 
113 
131 
151 
172 
8 .. 
101 
116 
134 
154 
175 
10 
104 
119 
137 
157 
178 
12 _ 
104 
119 
136 
155 
175 
14 
107 
122 
139 
158 
178 
16 
109 
125 
142 
160 
180 
18 
112 
128 
144 
163 
183 
20 
114 
130 
147 
165 
186 
22 
109 
124 
141 
161 
181 
24 
111 
126 
143 
162 
183 
26 
113 
128 
146 
165 
185 
28 
115 
130 
148 
167 
187 
30 _____ _'_ 
117 
133 
150 
169 
189 
32 
118 
135 
152 
171 
192 
34 
120 
137 
154 
173 
194 
36 
122 
139 
157 
176 
196 
38 _ 
124 
141 
159 
178 
198 
40 
126 
144 
161 
180 
200 
42 
128 
146 
163 
182 
202 
44 . 
130 
148 
165 
184 
204 
c. Follow across the left of the chart and find the suction pres- 
sure pounds which should read on the tank suction line gauge. (See 
fig. 26 (5).) If the gauge reading is lower than on the chart, add 
the necessary Freon by opening the tank valve slightly, until a cor- 
rect reading of the gauges correlates with the readings of the chart. 
Caution: Do not add gas too fast as you can overcharge as well 
as undercharge a refrigeration unit. 
60. REMOVAL OF REPLENISHMENT EQUIPMENT 
a. When the gauges and the chart correspond, immediately make 
sure that the cylinder valve is completely closed. 70 
b. After the unit has run for a few minutes and the pressures 
continue to correspond to the chart, although they may vary when 
the unit is operating and not operating, make sure that the receiver 
tank valve and suction line valve are completely closed. Disconnect 
the cylinder to suction line assembly and the receiver tank gauge 
assembly. Replace the plugs and the studs on the suction line valve 
and receiver tank valve. The unit is now in operation and fully 
charged. 
61. LEAK DETECTOR TORCH (HALID LAMP) 
a. Refrigerant leaks with Freon can be located by use of a leak 
detector torch (Halid Lamp). (See fig. 25 (26).) The torch con- 
sists of a special alcohol burner (some are for gasoline), the air for 
combustion being taken in through a flexible sampling tube. When 
air only is taken into the tube, the flame of the torch is colorless. 
When a mixture of air and a small amount of refrigerant is taken 
into the tube, the flame turns faintly green. A higher concentra- 
tion of refrigerant increases the green color in the flame. A high 
concentration of refrigerant turns the flame a bright blue. 
b. In using the leak detector torch, hold the inlet end of the sam- 
pling tube as close to the joint as possible without stopping off the 
air to the torch. Slowly proceed completely around each joint with 
the end of the sampling tube. Remember that an appreciable length 
of time is required for the sample to be drawn into the torch and 
that the indication, therefore, is not instantaneous. Since the re- 
frigerant vapors are heavier than air, the drift is downward from 
a leak. The indication of refrigerant may therefore often be de- 
tected below a leak where it cannot be detected above. 
c. If no leaks are found at lower pressures, turn out the liquid 
receiver service valve until a pressure of 15 pounds shows on the 
gauge; then retest for leaks. 
d. If a leak is apparent, it can be stopped often times by tighten- 
ing the joint. 
62. TO FREE REFRIGERANT EXPANSION VALVE WHEN STUCK 
At times the refrigerant expansion valve (fig. 12 (1)) may stick 
in a closed position on these units, and when this occurs they may 
usually be opened by the following method: 
a. Close the liquid line valve (fig. 11 (3)) and pump down the 
unit until 20 inches of vacuum may be read on the suction line gauge. 
b. Shut off the unit and crack the liquid line valve quickly and 
listen for a hissing through the refrigerant valve. 71 
APPENDIX 
Section I. SHIPMENT AND STORAGE 
1. GENERAL 
These instructions cover the preparation for temporary storage 
and local shipment. Items to be prepared for temporary storage 
or local shipment are those ready for immediate service but not 
stored over 80 days. These instructions cover only the preparation 
of the item. Packing, crating, and method of shipment will be in 
accordance with existing Medical Department procedure. 
2. PRE-DISASSEMBLY PROCEDURE 
Before the Processing Unit is drained of water and the tanks 
flushed, it should be given a final lubrication in accordance with 
Lubrication Order 8-629. (See fig. 15.) 
a. Check the pump packing on the water pump in accordance 
with paragraph 30. 
b. With 5 gallons of water in the unit and the circulation and 
recirculation pipe in the main reservoir tank reversed, operate as 
a closed unit for at least 30 minutes. At the end of this time, if the 
temperature reading (manually taken) is correct, shut off the unit. 
If incorrect, make minor adjustments which are necessary, and if 
these are not adequate refer the unit to higher echelon. 
3. DISASSEMBLY PROCEDURE 
a. Completely drain the unit and scrub the unit vigorously with 
a bristle brush. 
h. Remove the 110-V. line to the safelight from its receptacle 
and disconnect the main reservoir tank from the base assembly and 
allow to dry thoroughly, preferably in a warm dry place. 
Note. Too rapid drying is not recommended as the tank may crack. When 
the tanks are dry, remove the safelight and timer bracket, clean and dry thor- 
oughly, and store in the developer tank adequately wrapped and packed to 
prevent damage or breakage. 
c. Remove all wiring (110-V. to base assembly and ground to 
base) from their connections and fold into the unit. Then remove 
or disconnect all piping connections if the unit has been used as 
an open unit. 
d. Make sure that no water remains within the mixing chamber 
or water pump and lines. 72 
e. Allow the base assembly to dry thoroughly. Visually inspect 
the base assembly and remove any rust appearing on the surfaces 
of the unit by sanding with paper, Flint #2, or other suitable 
material. 
■/. When the base assembly is completely dry, thoroughly wipe 
all parts with an oily rag. 
4. STORAGE PROCEDURE 
If the unit is not to be moved, it now may be stored in its present 
condition for 30 days. 
5. SHIPMENT 
If the unit is to be locally shipped or moved extensively or stored 
for longer periods of time than were anticipated, it is advisable 
to place the base assembly and tank assembly in well-constructed 
and braced crates. 
6. WEIGHTS FOR PROCESSING UNIT 
Base assembly crated for shipment 294 lb 
Base assembly uncrated ready for use 225 lb 
Tank assembly crated for shipment 274 lb 
Tank assembly uncrated for use , 135 lb 
Note. For the “all metal tank group” add 15 lb. 
Section II. REFERENCES 
7. TECHNICAL MANUALS 
TM 8-280, Military Roentgenology. 
8. TECHNICAL BULLETINS 
TB MED 99, Life of Photoroentgen Films. 
TM MED 117, Electrical Requirements for X-Ray Apparatus in 
the Field or in Temporary Installations. 
9. ARMY SERVICE FORCES MEDICAL SUPPLY CATALOG 
Introduction MED 1 
Index MED 2 
List of items for troops, posts, camps, and stations MED 3 
Organizational and higher echelon spare parts, X-ray 
Field Unit, Processing Unit for __MED 7-9611500 
List of all parts, 9611500 X-ray Field Unit, Processing 
Unit (when published) MED 9 73 
10. LIST OF FORMS MENTIONED IN MANUAL 
WD AGO Form 468, Unsatisfactory Equipment Report, 
11. LIST OF ABBREVIATIONS USED IN MANUAL 
AC Alternating Current 
AGO Adjutant General’s Office 
AMP Ampere 
ASF Army Service Forces 
“DIFF” Differential 
F. Fahrenheit 
Fig. Figure 
In. i Inch 
I.P.T. Inside pipe thread 
KW. Kilowatt 
LB Pounds 
MED 7 ASF Catalog MED 7 
NO. Number 
O.D. Outside diameter 
Par. Paragraph 
PF Primary Winding Finish 
PS Primary Winding Start 
S2 Secondary Winding Terminal No. 2 
Sec. Section 
Sq. Square 
TM Technical Manual 
V Volt 
WD War Department 
65° __L 65 degrees INDEX 
Paragraph Page 
Abbreviations, list of App. 73 
Adapter, cylinder (F 12) 58d 68 
After operation check 30c 39 
Airspace 9a (1) 15 
Assemblies, Processing Unit 3d 4 
Assembling Processing Unit 9 15 
Assembling Tank Group Processing Unit 9d 16 
Autotransformer (50-cycle operation) 3c(2)(6),9f 4,17 
Auxiliary Wash Tank 35, 38a(2) 43,46 
Identification 35a 44 
Difference in models 355 44 
Baffles, tank 36a 44 
Base assembly, Processing Unit 3d(2) 7 
Bleeding 1 10/ 25 
Bulleyes, compressor 3c(2)(6) 4 
Calibration: 
Dial 14d(3) 29 
Orifice : 14e 29 
Valve Sd(2) (e) 10 
Valve and orifice 10a, 14c 21,29 
Valve, Auxiliary Wash Tank 40, 44d 51,54 
Water valve control 14d 28 
Capacities 4b 11 
Capacitor 46a (2) 57 
Capacity, Auxiliary Wash Tank 366 44 
Capacities, Loading Bin and Dryer 46c (2) 58 
Circuit breaker switch, pump motor 3d (2) (g) ,9/(1) 10, 20 
Circulation : 3a(2) 1 
Circulation check 10/(3) 25 
Circulating inlet pipe bushing with strainer_ 3d(l) (g) 7 
Circulating water pump and motor 3d(2) (d) 10 
Class B equipment 12 26 
Cleaning, Auxiliary Wash Tank 446 54 
Closed system 10c 23 
Cooler switch 3d(2) (g), 13,14# (3) 10, 26, 31 
Condenser radiator 246 35 
Connecting Auxiliary Wash Tank 386(6) 50 
Controls 14 26 
Controls, Dryer and Loading Bin 48 60 
Control switch 14g 31 
Community drain pipe 3d(l)(p0 7 
Compressor 9c, 13, 58e 16, 26, 68 
Compressor motor 14h 32 
Compressor inoperative 33d 41 Paragraph Page 
Community water temperature 14cZ 28 
Coupling No. 1, Processing Unit 9</(l) 17 
Coupling No. 2, Processing Unit 9p(2), 9# (3) 17 
Correcting calibrated valve and orifice 10a 21 
Crating .1 36 3 
Part 1 36(1) 3 
Part 2 36(2) 3 
Crescent wrench 56 11 
Cylinder (F 12) adapter 58d 68 
Darkroom light switch 14p(4) 31 
Darkroom interval timer 3d(l)(e) 7 
Darkroom safelight 3d(l)(/) 7 
Developer tank insert 3d(l)(6) 6 
Dichlorodifluoromethane 57h, 58e 66, 68 
Disassembly, Auxiliary Wash Tank 45a 54 
Disassembly procedure, Processing Unit App. 71 
Discoloration of accessories 30d(4) 39 
Discoloration, Auxiliary Wash Tank 44c 54 
Draining, Auxiliary Wash Tank 44a 53 
Drain piping 9flr(4) 17 
Drain reducing nipple 6a 11 
Drip pan, Auxiliary Wash Tank 38a, 38b (8) 46, 51 
Drip pan, Loading Bin and Dryer 
Combination 46a(2),51d 57,61 
Drying rack 46a (2) 57 
During operation check 306 38 
Dust 24 35 
Electrical connections, Loading Bin and 
Dryer 476(2) 58 
Electrical connections (50-cycle operation) 9i 17 
Electrical connections (60-cycle operation) 9h 17 
Electrical supply 9h, 9i 17 
Element thermal 3.5-amp, 6c, 9/(1) 11, 20 
End plate refrigerating coil 3c(2) (6) 4 
Excessive moisture on base 25 35 
Exhaust fan 46a(2), 46c(1), 48 57, 58, 60 
Exhaust fan inoperative, Loading Bin and 
Dryer 516 60 
Extreme heat 23 35 
F 12 57h, 58e 66, 68 
F 12, pressure 59 68 
Failure of equipment 7 15 
Fan motor with capacitor 46a(2) 57 
Film developing capacities 46(6) 11 
Film hanger supports, Auxiliary Wash Tank 38a 46 
Film holder supports 3d(l) (d) 7 
Film storage compartment 46a (1) 57 
Fixer tank insert 3d(lc) 6 
Flaring tool, tube 566(2) 63 Paragraph Page 
Floor loading shelf 46a (2) 57 
Freon 56, 58e 63, 68 
Freezing 22 34 
Fuse block 46a(2), 476(2) 57,58 
Gauge, 0 to 300 pounds pressure 57a (1) 66 
Gauge, compound 57a (2) 66 
Generator, gasoline electric 20 34 
Halid lamp 566 (3), 58c (1), 58e, 61 63, 68, 70 
Heater, electrical, 1,200-watt 3a(l),3d(2) (6),13,14/ 1,7,26,30 
Heater elements inoperative, Loading Bin 
and Dryer 51a 60 
Heater relay 13 26 
Heater switch 3d (2) (#), 13,14#(2) 10,26,31 
Heater strips 46a(2), 46c(1), 476(2), 48 57,58,60 
Heater, water, 1,200-watt 3a(l), 3d(2) (6), 13,14/ 1,10, 26, 30 
Heating element inoperative 34 42 
Hot air duct 52 61 
Index pointer Processing Unit 14d(3) 29 
Inlet pipe bushing with strainer 3d(l) (#) 7 
Inlet reducing nipple 6a 11 
Interchangeability of parts 3c (2) 4 
Tank group 3c (2a) 4 
Base assembly 3c (2b) 4 
Interconnecting Auxiliary Wash Tank to 
Processing Unit 386(2) 46 
Interval timer 3d(l)(e),15 7,32 
Latches, Loading Bin and Dryer Combina- 
tion inoperative 51c 61 
Leak detector torch 566 (3), 58c (1), 58e, 61 63,68,70 
Leaks, water, Processing Unit 9e 16 
Leaky water pump 30a(7) 38 
Loaded cassette compartment 46a (1) 57 
Location, Auxiliary Wash Tank 386(1) 46 
Location, Loading Bin and Dryer 476(1) 58 
Low water level 18# 33 
Lubrication 28 36 
Main line switch 3d (2) (#), 13,14# (1) 10,26,31 
Main reservoir tank 3d(la) 6 
Mixing chamber 3c(2) (6), 3d(2) (a) 4,10 
Mixing chamber air bound 33c 41 
Mixing chamber and plate (see End plate 
refrigerating coil). 
Mounting Auxiliary Wash Tank 386(5) 50 
Mounting Tank Group Processing Unit 9/ 17 
Motor fan with capacitor 46a (2) 57 
Nonreversible ratchet with offset handle 5a 11 
Nipple reducing 6a 11 Paragraph Page 
“OFF” operation 176 33 
“ON” operation 17a 33 
Open system lOd 23 
Operation 11 25 
Operation Auxiliary Wash Tank 386(9), 41a 51 
Orifices 66,14e 11, 29 
Overflow community drain pipe 3d(l)(p) 7 
Overflow pipe 9d(l) 16 
Overflow pipe with strainer 3d(l) (g) 7 
Performance 4a 10 
Performance, Auxiliary Wash Tank 36a 44 
Plumbing, Auxiliary Wash Tank 386 (7) 50 
Plumbing connections, Processing Unit 9g 17 
Power source 9h, 9i, 33a 17, 40 
Precautions 18 33 
Preventive maintenance, Auxiliary Wash 
Tank 43a 52 
Preoperative procedure, Loading Bin and 
Dryer 47c 59 
Pre-regulator 38a(2),386(3),386(4) 46,47,50 
Pump motor overload circuit breaker switch 3d (2) (g) 10 
Purging 586, 58c, 58c(l), 58d 66,67,68 
Ratchet wrench 5a 11 
Recalibrating valve, Processing Unit 14d(5) 29 
Receiver and base assembly 3c (2) (6) 4 
Receiver tank 58c 67 
Recirculating overflow pipe with strainer 3d(l) (g), 9d(2) 7,16 
References App. 72 
Refrigerant: 
Evaporator coil 3a (1) 1 
Coil, end plate 3c(2) (6) 4 
Expansion valve ! 62 70 
Leak detector 566 (3), 58c (1), 58e, 61 63, 67, 68, 70 
Line 106 21 
Pressure control 146(3), 14c 27,28 
Valves closed 10c 21 
Refrigeration system inoperative 33c 41 
Refrigerator unit 3d(2)(c) 10 
Relay control 146. 32 
Resetting pump circuit breaker 14a 26 
Safelight 3d(l) (/), 9d(3), 7,16, 25 
Sand 24 1 35 
Semiannual service, Auxiliary Wash Tank 43c 53 
Service upon receipt of used Loading Bin and 
Dryer 47d 60 
Shipment, Loading Bin and Dryer combi- 
nation 53 62 
Shipment, Processing Unit App. 71 Paragraph Page 
Side covers, Processing Unit 96 16 
Spanner face wrench 5c 11 
Storage, Loading Bin and Dryer 
Combination 53 62 
Storage, Processing Unit App. 71 
Strainer =. 30a (9) 38 
Suction line valve 58d 68 
Switch block 46a (2) 57 
Switch box 3d(2) (g) 10 
Tank assembly 3d(l) 4 
Tank coupling No. 1, Processing Unit 9#(1) 17 
Tank coupling No. 2, Processing Unit 9g(2), 9g(3) 17 
Tank group 3c(l) 4 
Technical operation 16 32 
Temperature controls, thermostatic 3d(2) (/) 10 
Testing for tank leaks, Processing Unit 9e 16 
Thermal element 3.5-amp 6c, 9j (1) 14, 20 
Thermal pre-regulator 38a, 386(3), 386(4) 46, 47, 50 
Thermostat, temperature, complete 3c(2)(6) 4 
Thermostatic temperature controls 3d(2) (/) 10 
Thermostatic water temperature control 146 27 
Timer, interval 3d(l)(e),15a 7,32 
Timer, bracket 9d(3) 16 
Tubing, copper 576 66 
Tube cutter 566 63 
Unpacking Processing Unit 8 15 
Unsatisfactory performance » 7 15 
Unsatisfactory performance, Auxiliary 
Wash Tank 38 46 
Unsatisfactory performance, Loading Bin 
and Dryer 47a 58 
Used equipment 12 26 
Unusual conditions, Auxiliary Wash Tank 42 52 
Valve, calibrated 3d(2) (e) 10 
Valve, calibrated, Auxiliary Wash Tank 40, 40d 51 
Valves, refrigerant 586 66 
Valve, suction line 58d 68 
Water circulation 336 40 
Water heater 14/ 29 
Water level 10/(1) 25 
Water pump 30a (6) 38 
Water pump and motor 3d(2) (d) 10 
Water pump motor 336(3) 40 
Water pump air bound 336(4) 40 
Water sources, Auxiliary Wash Tank 416 52 
Water source undesirable temperature, 
Auxiliary Wash Tank 41c 52 Paragraph Page 
Water supply 9p(5) 17 
Water temperature 14d 28 
Water valve, calibrated 14d 28 
1,200-watt electrical heater 3a(l),( 3d{2) (b), 13,14/ 1,10,26,30 
Weekly service 30d 39 
Weekly service, Auxiliary Wash Tank 43 b 52 
Weights, Processing Unit App. 72 
Wrench, adjustable crescent 5b 11 
Wrench, ratchet 5a 11 
Wrench, spanner face > 5c 11