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TM 9-4110-257-14
(2) To pressurize a system that has been discharged and purged.
(a) Connect the charge hose to a refrigerant cylinder containing refrigerant R-134a set to deliver gas only.
(b) Check that service manifold vacuum valve is closed.
(c) Open the service manifold compound gage, pressure gage, and charge valves.
(d) Open refrigerant cylinder valve and pressurize system to 40-50 psi (2.8-3.5 kg/cm²).
(e) Close service manifold valves and refrigerant cylinder valve.
(f)
Disconnect charge hose from the refrigerant cylinder and connect it to a nitrogen regulator and nitrogen
cylinder.
(g) Open the service manifold compound gage, pressure gage, and charge valves.
(h) Open nitrogen cylinder valve and pressurize system to 350 psi (24.7 kg/cm2).
(3) Test for leaks at all points of possible leakage using a refrigerant gas leak detector. If a leak is found, take
necessary steps to replace damaged components or repair leak.
(4) If no leak was found and refrigerant only was used to pressurize the system, check refrigeration unit charge (para.
5-12).
(5) If no leak was found and nitrogen was used to pressurize the system, discharge (para. 5-7), evacuate
(para. 5-11), and charge (para. 5-12) the refrigeration unit.
5-19
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