TM 9-4120-371-14
Never introduce liquid refrigerant into the low pressure (suction) service valve.
NOTE
The system must be evacuated before charging. Use only refrigerant-22 to charge the
unit.
Whenever available, use recycled refrigerant for charging the refrigeration system.
a. Check that the hose from the low pressure service valve is connected to the compound gage side of the
charging manifold. The hose from the high pressure service valve should be connected to the pressure gage
side of the charging manifold.
b. Connect the center hose from the charging manifold to a well charged drum of refrigerant-22.
c. Loosen the hose connections to the two air conditioner service valves sightly.
d. Open the two charging manifold valves.
e. Open the refrigerant-22 drum valve slightly to allow a small amount of refrigerant to purge air from the
hoses. Tighten the hose connections at the air conditioner service valves.
f. Close the low pressure (suction) charging manifold valve. Never introduce liquid refrigerant into the low
pressure (suction) service valve.
g. Position the refrigerant-22 drum so that liquid will be used for charging. (Some drums must be inverted
and some are equipped with a selector valve.)
h. Using accurate scales, measure and record the weight of the refigerant-22 drum.
i. Open the refrigerant-22 drum valve.
* j. Open the high pressure service valve on the air conditioner. Allow liquid refrigerant to enter the system
until the drum weight has decreased by 3 pounds (1.2 kg) or until system pressure has equalized.
k. Close the refrigerant drum valve and the high pressure (discharge) manifold valve.
l. Connect air conditioner to a remote control module assembly.
m. Connect power.
n. Press and release both pressure switch reset buttons.
o. Turn air conditioner on and operate in the COOL mode with the Temperature control thermostat set at a
maximum DECREASE position.
* p. If the 3 pound (1.2 kg) full charge was obtained, skip steps p throughs. If the system pressure equalized
prior to obtaining a full charge of 3 pounds (1.2 kg), proceed with step p.
q. Switch the refrigerant drum to the gas only position.
r. Be sure that the refrigerant drum has been switched to the gas position and open the refrigerant drum
valve, the low (suction) pressure charging manifold valve, and the low (suction) pressure service valve on the
air conditioner.
* Effective for Keco Model F18T-2S Serial No. 81489 through 81533, use 3 Pounds (1.2kg) of Refrigerant.
Effective for Keco Model F18T-2S Serial No's. 82760 and higher, Keco Model F18T-2SA, and A.R.E. Model
CVP-20-5/6-08, use 4 Pounds (1.8kg) of Refrigerant.
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