TM 9-4120-378-14
Remarks
Action
Location/Item
Check to see that power is disconnected.
Service Valve
a. Remove screws from service valve access cover.
Access Cover
b. Remove service valve access cover.
Charging Valve Remove caps from high and low pressure service
Caps
valves.
Refrigeration
a. Connect low pressure gage hose of marnifold valve
System
to suction service valve.
Pressure
b. Connect high pressure hose of manifold valves to
discharge service valve.
Purge hoses - open discharge and suction service
c.
valves.
d. Check that manifold valves are closed.
e.
Start air conditioner.
f.
Compare gage readings with the normal range of
system pressure as shown on the following table.
Close discharge and suction service valves.
g.
h. Disconnect gages.
Install service valve access cover with screws.
i.
Pressure Range (psig)
Temperatures
125 F (52 C)
100 F (38 C)
Outdoor Ambient
50 F (10 C)
75 F (24 C)
75-90 suction
59-70 suction
60-75 suction
90 F (32 C)
55-65 suction
175-210 discharge 255-295 discharge 370-425 discharge
Return air to unit
125-160 discharge
(dry bulb)
65-75 suction
60-75 suction
58-70 suction
58-65 suction
80 F (27 C)
170-205 discharge 250-290 discharge 370-425 discharge
120-155 discharge
Return air to unit
(dry bulb)
