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TM5-4120-377-14
t. Run the air conditioner in COOL mode (with TEMPerature control thermostat in full DECREASE position)
for 15 minutes.
Do not skip the next step.
u. After 15 minutes, observe the sight glass on back of condenser section.
l Green center means the refrigerant moisture content is acceptable.
l Yellow center means there is too much moisture in the system. It must be discharged, evacuated, and
charged again.
l Milky white or bubbly liquid means the system has a low charge.
l Clear bubble-free liquid around the center means the system is fuIly charged.
v. If charge is low, add gas refrigerant.
(1) Be sure that drum is switched to gas position. Open the drum valve and the air conditioner low
pressure service valve.
(2) Continue to charge until sight glass is clear and bubble-free.
(3) Close the air conditioner low pressure service valve and refrigerant drum valve.
w. Check air conditioner for proper cooling. There should be at least a 15° F temperature difference between
evaporator discharge air and the inlet air. Turn the mode selector switch to OFF.
x. Assure that the high and low pressure air conditioner service valves are closed and remove the charging
manifold hoses from the air conditioner service valves.
y. Install service valve protective caps.
Figure 5-7. Service Valve Caps and Cover
z. Using screwdriver, secure service valve access cover with four screws and flat washers.
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