(1) Refer to figure 4-11 and install the suction pressure service valve and/or the discharge pressure service
(2) Perform any further maintenance of refrigeration components required.
(3) If no further maintenance of refrigeration components is required, refer to paragraph 4-8 and purge the
(4) Refer to paragraph 4-4c and check the service valves and the dehydrator for refrigerant leaks. Refer to
paragraph 4-4d and repair any leaks found.
(5) Refer to figure 4-4 and evacuate the refrigerant system.
(6) Refer to paragraph 4-10 and charge the system with refrigerant.
(7) Re-perform inspection procedure (paragraph a) for service valve to check for refrigerant leaks.
(1) Turn the selector switch to the "OFF" position and disconnect the air conditioner from the electrical power
(2) Refer to figure 4-12 and inspect the expansion valve, power bulb and tubing for obvious defects.
(3) Refer to paragraph 4-4c and check the expansion valve for refrigerant leaks. If expansion valve is leaking
refrigerant, refer to step c for repair.
Never adjust the expansion valve unless absolutely necessary. When adjusting
the expansion valve, allow the unit to run on "COOL" at least 20 minutes between
each adjustment. Insure that all panels are in place during the running period.
(1) Refer to figure 4-12 and tape the bulb of a thermometer to the suction line near the expansion valve
(2) Refer to figure 4-5 and install a suction pressure gage.
(3) Turn the selector switch to the "COOL" position and turn the thermostat control knob counter-clockwise to
its limit. Operate the unit on cool for approximately 30 minutes to stabilize the thermometer reading.
(4) Note pressure indicated on the suction pressure gage. To this pressure, add 2 psig (the estimated
suction line loss).