TM9-4120-400-14
continued]
5-16.
CHARGING THE REFRIGERANT SYSTEM. -
20. Monitor weight of refrigerant cylinder as air conditioner compressor pulls additional refrigerant into system until
full (2.2 pounds (1.0 kg) for F9000H-1SA or 2.4 pounds (1.09 kg) for F9000H-3SA) charge is obtained. When
system is fully charged, immediately close charge valve and compound gauge valve.
21. Run air conditioner in COOL mode with TEMPERATURE SELECTOR set at maximum COOLER position for
15 minutes.
22. With unit running, observe sight glass on back of condenser section. Be sure that the refrigeration system is
not in bypass. When system goes into bypass bubbles will appear in the sight glass.
Green center means refrigerant moisture content is acceptable.
q Yellow center means there is too much moisture in system. It must be discharged, evacuated, and
charged again.
Milky white or bubbly liquid means system has a low charge.
q Clean bubble-free liquid around center means the system is fully charged.
23. If charge is still low, carefully add refrigerant.
Never introduce liquid refrigerant into the low pressure (suction) charging valve. This can
a. Set refrigerant cylinder to deliver gas only.
Never introduce high discharge pressure into a refrigerant cylinder. This can cause the
cylinder to rupture and injure personnel.
b. Check that pressure gauge valve is closed.
c. Open compound gauge and charge valves.
d. Continue to charge until sight glass is clear and bubble-free.
e. Close compound gauge, charge, and refrigerant cylinder valves.
24. Turn MODE SELECTOR switch to OFF.
5-44