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5-13
TM5-4120-375-14
5-16. Leak Checking.
a. Connect a pressure gauge to the suction service valve and a
cylinder of refrigerant (item 21,table D-1) to the discharge
service valve. Open both service valves and the cylinder shutoff
valve. Let refrigerant flow into the system until the pressure
gauge indicate 50 psig (3.5 kg/cm 2). Close cylinder shutoff
valve and discharge service valve and disconnect the refrigerant
cylinder.
b.
Connect a cylinder of dry nitrogen (item 8,table D-1) to the dis-
charge service valve.
Open the cylinder shutoff valve and the
discharge service valve and pressurize the system to 350 psig
(22 kg/cm 2).
Close all three valves and test for leaks, using an
electronic leak detector or the soap bubble method as described
below:
NOTE
The electronic leak detector is sensitive to the presence of
refrigerant gas (Table D-1, Item 1) in the atmosphere. When refrigerant
gas is present in the atmosphere of the work area, false indications
can result. Use in a well ventilated but draft-free area.
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