TM 9-4120-395-14&P
Section II. MAINTENANCE PROCEDURES
Para.
Para.
Front and Side Door Assemblies
Drier ................................. ................................ 5-12
Capillary Tubes ................................................. 5-13
and Venturi Panel .............................................. 5-3
Refrigeration System, General Repairs ..... ....... 5-4
Accumulator ........................... .......................... 5-14
Indoor Coil ............................ ............................ 5-15
Discharging Refrigeration System ...... ............... 5-5
Outdoor Coil .......................... ........................... 5-16
Purging Refrigeration System ............................ 5-6
Check Valve ........................... .......................... 5-17
Brazing/Debrazing Procedures ............. ............. 5-7
Pressure Switches ..................... ...................... 5-18
Leak Testing Refrigeration System .................... 5-8
Reversing Valve ........................ ....................... 5-19
Evacuating Refrigeration System .......... ............ 5-9
Compressor ........................... ........................... 5-20
Charging Refrigeration System ............. ............ 5-10
Tubing and Fittings ..................... ...................... 5-21
Refrigeration Pressure Check ............................ 5-11
5-3. FRONT AND SIDE DOOR ASSEMBLIES AND VENTURI PANEL. See paras 4-17, 4-19, and 4-43. Repairs are
limited to the following:
a.
Straighten minor dents using standard sheet metal repair practices.
b.
Repair broken welds using standard weld repair practices.
c.
Replace or repair gasket or insulation.
(1) Remove as much old gasket or insulation material as possible by pulling or scraping it away from the metal
surface.
Solvents are flammable and their vapors can be explosive.
Repeated or
prolonged skin contact or inhalation of vapors can be toxic. Use in a well
ventilated area, wear gloves and eye protection, and keep away from sparks or
flame.
(2) Soften and remove old adhesive and gasket insulation residue, using solvent (Appendix F, Item 10) and a
stiff brush.
(3) Coat the mating surfaces of the metal and gasket or insulation (if applicable) with adhesive (Appendix F,
item 1). Let both surfaces dry until the adhesive is tacky but will not stick to fingers.
(4) Starting with an end, carefully attach to the metal. Press into firm contact all over.
d.
Should touch up or refinishing be necessary, see TM 43-0139, Painting Instructions for Army Materiel.
5-4. REFRIGERATION SYSTEM, GENERAL REPAIRS.
DANGEROUS CHEMICAL (R-22) refrigerant under pressure is used in this
equipment. DEATH or severe damage may result if personnel fail to observe
safety precautions. Use great care to avoid contact with liquid refrigerant or
refrigerant gas being discharged under pressure. Sudden and irreversible
tissue damage can result from freezing. Wear thermal protective gloves and a
face protector or goggles in any situation when, skin/eye contact is possible.
Do not inhale refrigerant gas. Ensure work area is well ventilated. Prevent
contact of refrigerant gas with flame or hot surfaces. Heat causes the
refrigerant to break down and form carbonyl chloride (phosgene), a highly
poisonous and corrosive gas.
NOTE
The refrigeration system must be totally discharged before performing maintenance
that requires opening of the pressurized system. Leak testing and drier replacement
are required any time the pressurized system has been opened. The system must be
evacuated before it is charged. The system must be properly charged to function
properly.
5-4