TM 9-4120-404-14
4-6. SERVICING THE REFRIGERANT SYSTEM.
This Task Covers:
a. Equipment Setup
b. Refrigerant recovery
c. Purging the System
d. Leak Testing the System
e. Evacuating the System
f. Charging the System
g. System Pressure Check
h. Equipment Removal
Initial Setup:
Tools Required
Tool Kit, Service, Refrigeration, Unit (Item 1, Appendix B)
Gloves (Item 2, Appendix B)
Goggles (Item 2, Appendix B)
Refrigerant Recovery and Recycling Unit (Item 4, Appendix B)
Regulator Assembly (Item 6, Appendix B)
Nitrogen Cylinder (Item 2, Appendix E)
Vacuum Pump (Item 1, Appendix B)
Refrigerant, R-22 (Item 16, Appendix E)
Oil (Item 22, Appendix E)
Personnel Required
Two EPA Certified Refrigeration Technicians
Equipment Condition
Air conditioner shut down and cool.
Air conditioner disconnected from power source.
WARNING
DANGEROUS CHEMICAL
(R22)
is used in this equipment.
DEATH or severe injury may result if personnel fail to observe safety precautions.
Use great care to avoid contact with liquid refrigerant gas being recovered 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 refrigerant to break down and form carbonyl chloride
(phosgene), a highly poisonous and corrosive gas.
WARNING
REFRIGERANT UNDER PRESSURE
is used in the operation of this equipment.
DEATH or severe injury may result if you fail to observe safety precautions. Never
use a heating torch on any part that contains refrigerant 22. Do not let liquid
refrigerant touch you, and do not inhale refrigerant gas.
4-5
