TM 5-4220-227-14
6-11.
Heater/Chiller Module.
This task covers:
Repair
INITIAL SETUP
Tools
Materials/Parts
General Mechanic's Tool Kit
Ethylene Glycol (Item 10, Appendix E)
(NSN 5180-00-177-7033)
Refrigerant-22 (Item 23, Appendix E)
Recovery and Replacing Unit, Refrigerant
Equipment Condition
Materials/Parts
Heater/chiller module removed (para. 4-28).
Coil Element
Evaporator Coil
Repair. Refer to the heater/chiller module flow diagram (figure 6-16) and electrical schematic (figure 6-17) when
repairing the heater/chiller module.
WARNING
Death or serious injury may result if personnel fail to observe safety precautions when handling liquid
refrigerant. 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 where skin-eye-contact is possible.
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
In accordance with Environmental Protection Agency regulations refrigerants cannot be discharged into
the atmosphere. A refrigerant recovery and recycling unit must be used whenever discharging the
refrigerant system.
Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL ONLY.
6-35
