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 TM 55-1905-220-14-8
4-29. 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.
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 4-29(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 4-29(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
4-871
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