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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
4
Weigh refrigerant drum. Weight of refrigerant contained in drum can be determined by
comparing total weight with tare weight stamped on drum. Amount of refrigerant charged can
also be determined by comparing drum weights before and after charging.
5
Connect refrigerant drum to charging valve with flexible charging line. A charging line which
can be easily made up is as shown below. Before securing charging line tightly to
charging
valve, crack open valve on refrigerant drum slightly and blow out charging line. With
charging
line connections made tight, open drum valve slightly to test connections for leaks. Incline
drum with valve end down.
Charging or Drain Line
NOTE
When adding refrigerant to a charged system, start compressor and pump down system
to a suction pressure of 1 - 2 psig (6.9 - 13.8 kPa). Refer to paragraph 4-28(5)(b).
6
Open charging valve and carefully open valve on refrigerant drum. Liquid refrigerant will flow
into the system.
7
Start compressor as outlined in paragraph 4-28(5)(b) steps (9) through (14).
8
Continue charging until estimated amount of refrigerant required has been charged. If required
refrigerant charge by weight is not known, observe liquid level in receiver. When receiver is
nearly full, close charging valve, close dryer outlet valve, and open dryer bypass valve.
If
dryer has no bypass, close charging valve and open dryer inlet valve. With system
operating,
observe
4-841
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