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 TM5-4120-383-14
5-14.
LEAK TESTING.-Continued
(d) Open n i t r o g e n tank valve and pressurize system to 350
2
psi (24.7 kg/cm ).
(e) Perform leak tests.
(f) If a leak is found, discharge and purge system and
repair leak. See specific instructions for component removal.
If a leak was not found and Refrigerant-22 was used to
(g)
pressurize system see charging instructions (para 5-16.).
(2) To pressurize a system that has been discharged and
purged, for leak testing with an electronic detector:
(a) Connect hoses from charging manifold to charging
valves.
(b) Connect drum of Refrigerant-22 to center hose
connection of service manifold.
Connect the Refrigerant-22 drum so that only gas will
be used for pressurization.
(c) Open both unit charging valves and charging manifold
valves.
(d) Qpen refrigerant drum valve slightly and adjust as
necessary to prevent formation of frost; and, allow system pressure
2
to build up until gages read 40-50 psi (2.8 - 3.5 kg/cm ).
(e) Close charging manifold valves and refrigerant drum
valve.
(f) Remove Refrigerant-22 drum from center hose connection.
(g) Connect a cylinder of dry nitrogen to center hose
connection.
(h) Open the charging manifold valves and the nitrogen
cylinder valve; allow system pressure to build up until gages read
2
350 psi (24.7 kg/cm ).
(i) Perform leak tests, then discharge and purge system, in
accordance with paragraphs 5-11 and 5-12 before performing
maintenance, or before evacuating and charging system, as
appropriate.
5-35
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