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TM 5-4120-364-13
4-8.
ADDING REFRIGERANT.
General.  Bubbles or a milky or frothy appearance of the refrigerant passing the sight
a.
glass in normal operation is indication that the system needs additional refrigerant. The normal
refrigerant charge in the unit when shipped is 13 pounds 8 ounces of refrigerant R-12. Test for leaks
with available leak detector, repair leak and add refrigerant.
Adding Refrigerant. When adding refrigerant to the system, connect the service gage
b.
hookup shown in figure 4-2 and proceed as follows:
(1) Turn stem of suction service valve counterclockwise as far as possible.
(2) Connect a line from the R-12 charging cylinder to connection on compressor
suction valve. Leave connection loose at the compressor valve and open charging cylinder outlet valve
long enough to purge all air from the charging line through the loose connection. Tighten charging line
connection at compressor suction valve when gas can be heard escaping from the loose connection.
(3) Turn suction service valve clockwise 3 or 4 turns.
(4) Open charging cylinder outlet valve 1 or 2 turns.
4-6. 1/(4-6.2 blank)
Change 3

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