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 TM 5-4120-374-13
LOCATION/lTEM
ACTION
REMARKS
TOP OF HOUSING
Avoid bodily contact with liquid refrigerant and avoid inhaling refrigerant gas. Be especially
careful that Refrigerant 12 does not come in contact with eyes. In case of refrigerant leaks,
ventilate area immediately.
4. Discharge Refrigerant a.
Remove valve caps from service valves.
b.
Attach charging manifold hoses to service valves.
System.
NOTE
In accordance with Environmental Protection Agency regulations refrigerants cannot be
discharged into the atmosphere. A refrigerant recovery & recycling unit must be used
whenever discharging the refrigerant system.
Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL ONLY
c. Connect and operate a recovery/recycling unit in
accordance with the manufacturer's instructions.
5. Dehydrator
Refer to paragraph 5-12 and replace dehydrator.
6. Purge Refrigerant
a.
Remove valve cap from discharge and suction service
valves.
system
b.
Using proper nitrogen regulator, connect a cylinder of
dry nitrogen to suction service valve.
Attach suitable hose to discharge service valve.
c.
d.
Open both suction and discharge service valves.
e.
Open valve on nitrogen cylinder and allow nitrogen to
flow through refrigerant system until all moisture is
forced out. Do not exceed 5 psig.
f.
Close nitrogen cylinder valve.
Close suction and discharge service valves.
g.
h.
Remove nitrogen cylinder and discharge hose.
i.
Using bar manifold, connect vacuum pump to center
hose. Using proper hoses, connect suction service
valve to suction pressure gage.
Turn on vacuum pump, open service valves and hold a
j.
29.0 inch Hg vacuum for eight (8) hours.
k.
Close suction and discharge service valves.
l.
Turn off vacuum pump.
m.
Remove hoses from suction and discharge valves.
n.
Remove vacuum pump and install valve caps.
Change
2
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