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Page Title:
REFRIGERANT SYSTEM SERVICE - (CHARGING) - continued |
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 TM 9-4120-430-14
0049 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. See
figure 1.
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 form
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.
13. After 15 minutes, observe the liquid sight indicator (sight glass) on left rear of unit.
a.
Green center means the refrigerant moisture content is acceptable.
b.
Yellow center means there is too much moisture in the system. It must be discharged, evacuated and charged
again.
c.
Milky white or bubbly liquid means the system has a low charge.
d.
Clear bubble-free liquid around the center means the system is fully charged.
14. If charge is low, add more gas refrigerant.
a.
Open the cylinder valve and the manifold low pressure valve.
15. Check air conditioner for proper cooling. There should be at least a 15 degrees F temperature difference between
evaporator discharge air and intake air. Turn mode selector switch to OFF.
0049 00-2
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