TM 9-4120-378-14
5.9 REFRIGERATION SYSTEM SERVICING - (CHARGING). - C o n t i n u e d
Remarks
Action
Location/Item
d.
Open the two charging manifold valves.
e.
Open the refrigerant-22 or charging cylinder valve
slightly to allow a small amount of refrigerant to
purge air from the hoses. Tighten the hose connec-
tions at the air conditioner service valve.
f.
Close the low pressure (suction) charging manifold
valve.
Position the refrigerant-22 cylinder so that liquid will
g.
be used for charging. (Some cylinders must be in-
verted and some are equipped with a selection
valve.)
Using accurate scales, measure and record the
h.
weight of the charged refrigerant-22 cylinder.
i.
Fully open the refrigerant-22 cylinder valve.
j.
Open the high pressure service valve on the air
conditioner. Allow liquid refrigerant to enter the
system until the charged refrigerant cylinder weight
has decreased by 2.875 Ibs (1.15 kg) or until sys-
tem pressure has equalized.
k.
Close the refrigerant cylinder valve and the high
pressure (discharge) manifold valve.
l.
Connect power to air conditioner.
m. Press and release both pressure switch reset but-
tons.
n.
Turn air conditioner on and operate in the COOL
mode with the temperature control thermostat set
at a maximum COOLER position.
If the 2.875 Ibs (1.15 kg) full charge was obtained,
o.
skip Steps o through r. If the system pressure
equalized prior to obtaining a full charge of 2.875
Ibs (1.15 kg) proceed with Step p.
Switch the refrigerant cylinder valve, the low (suc-
p.
tion) pressure charging manifold valve, and the low
(suction) pressure service valve on the air condi-
tioner.
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