TM 9-4120-378-14
5.7 REFRIGERATION SYSTEM SERVICING- (LEAK TEST).
-Continued
Location/Item
Action
Remarks
(g) If a leak is found, discharge and purge
the system and repair leak. See specific
instructions for components to be re-
moved.
(h)
If a leak was not found and refrigerant-22
was used to pressurize the system, see
charging instructions (see paragraph
(2) To pressurize a system that has been dis
charged and purged for leak testing with an
electronic detector
(a)
Remove the hose connection protective
caps from the high and low pressure ser-
vice valves.
(b)
Connect the hoses from a charging man-
ifold to the service valves.
(c)
Connect a cylinder of refrigerant-22 tc
the center hose connection of the charg-
ing manifold.
Connect the refrigerant-22 cylinder so
that only gas will be used for pressur-
ization.
(d)
Open both unit service valves and the
charging manifold valves.
Open the refrigerant cylinder valve
(e)
slightIy and adjust as necessary to pre-
vent formation of frost, and allow system
pressure to buildup until the gages read
40-50 psi (2.8-3.5 kg/cm2).
Close the charging manifold valves and
(f)
the refrigerant cylinder valve.
Remove the refrigerant-22 cylinder from
(g)
the center hose connection.
Connect a nitrogen regulator of dry nitro-
(h)
gen to the center hose connection.
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