TM 9-4120-407-14
4-15. FLUSHING THE REFRIGERANT SYSTEM.
b. Purge
This task covers:
a. Flush
INITIAL SETUP
Equipment Conditions:
Tools
Compressor removed. See para 4-31.
Refrigeration Unit Service Tool Kit
(Item 1, Appendix B)
Goggles (Item 1, Appendix B)
Gloves (Item 2, Appendix B)
Diaphragm Pump (Item 13, Appendix B)
Nitrogen Regulator (Item 6, Appendix B)
Materials/Parts
Refrigerant R-114 (Item 4, Appendix E)
Nitrogen (Item 7, Appendix E)
a. Flush. Flush the refrigerant system with refrigerant R-114. Procedures for flushing the system are as
follows:
(1) Connect the two filter-drier fittings with a jumper, locally manufactured from refrigerant tubing
and fittings.
(2) Connect a line from the discharge line in the Air Conditioner to the discharge side of pump.
(3) Connect a line containing a filter to the suction line in the Air Conditioner. The other end of the
line should discharge into a small drum or suitable reservoir.
(4) Connect a line to draw from the bottom of the reservoir to the inlet of the pump.
Burns can result from contact with acid formed by bum out of oil and
refrigerant. Avoid inhaling fumes and wear a gas mask if area is not
thoroughly ventilated. Wear protective goggles or glasses to protect
eyes. Wear gloves to protect hands.
(5) Fill reservoir with refrigerant R-114 and start pump. Keep reservoir full until refrigerant begins
to pour out of the return line. Continue flushing for at least 15 minutes.
(6) Reverse the Air Conditioner discharge and suction line connections, replace the filter with a new
filtering medium, and flush the system for at least 15 minutes.
4-36
