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 TM 5-4120-374-13
5-7. REFRIGERANT SERVICING (CONT)
REMARKS
ACTION
LOCATION/lTEM
TOP OF HOUSING
a. Remove caps from discharge and suction service valves.
3. Refrigerant System
b. Pressure check the refrigerant system as follows:
(1) Connect suction pressure gauge to suction service valve.
(2) Start air conditioner.
(3) Connect discharge pressure gauge to discharge service
valve.
(4) Open discharge and suction service valves.
(5) Compare gauge readings with the normal range of
system pressure as shown in the following table.
(6) Close discharge and discharge service valves.
(7) Remove gauges and install valve caps.
Normal Operating Pressures
Outdoor Ambient Temperature
95F(35C)
120F/125F(48.9C/57.7C)
At 90F/80F(32.2C/26.7C)DB/WB return air to unit
6171 PSI
Suction Pressure
Discharge Pressure
230260 PSI
At 80F/67F(26.7C/19.4C)DB/WB return air to unit
Suction Pressure
4454 PSl
Discharge Pressure
150175 PSl
5-6
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