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 TM 9-4120-425-14&P
REFRIGERATION SYSTEM SERVICING (CHARGING) - Continued
0054-00
SERVICE CHARGING
1.
Connect the hose from the low pressure service valve to the compound gauge side of the charging manifold. The
hose from the high pressure service valve should be connected to the high pressure gauge side of the manifold.
2.
Connect the center hose from the charging manifold to a well charged cylinder of refrigerant-22, or a charging
cylinder.
3.
Loosen the hose connection to the center of charging manifold.
4.
Open the refrigerant-22 or charging cylinder valve slightly to allow a small amount of refrigerant to purge air from
the hose. Tighten the hose connection at the charging manifold.
5.
Using accurate scales, measure and record the weight of the charged refrigerant-22 cylinder.
6.
Fully open the refrigerant-22 cylinder valve.
7.
Open the low pressure valve of the charging manifold. Allow refrigerant gas to enter the system until the system
pressure has equalized.
8.
Connect power to air conditioner.
9.
Press and release high pressure switch reset button. It may be necessary to jumper low pressure switch.
10. Turn air conditioner on and operate in the COOL mode with the temperature control thermostat set at a maximum
COOLER position.
11. Monitor the weight of the refrigerant cylinder as the air conditioner compressor pulls additional refrigerant gas into
the system until the full 6.00 pounds (2.72 kg) charge is obtained. When the system is fully charged immediately
close the refrigerant cylinder valve, and the charging manifold low pressure (suction) valve.
12. Run the air conditioner in COOL mode with temperature control thermostat in full COOLER position for 15
minutes.
NOTE
Do not skip the next step.
0054-00-3
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