21-00-02
Page 21-03
December 1, 1978
1F2
CHART 2101. TROUBLESHOOTING (AIR CONDITIONER) (cont)
Low suction pressure. Undercharge of refrigerant. Add refrigerant. Install new
(Evaporator not cold enough) Moisture freezing in ex- dryer. Evacuate and recharge.
suction gauge may pansion valve. Valve will
read a vacuum indicating show frost. Expansion
evaporator lacks re- valve inlet screen clogged. Remove screen. Clean with
frigerant. Inoperative expansion solvent and replace. Warm
valve. Valve stuck closed capillary by holding in
or capillary bulb has lost its hand. If suction pressure
charge. does not charge, replace
expansion valve.
Restriction anywhere in Locate restriction and
liquid line. Restriction repair.
will show frost.
High suction pressure. Capillary bulb clamp loose Clean contact surfaces of
on suction line. Suction suction line and cap bulb.
line shows frost. Tighten clamp.
Expansion valve not Replace expansion valve.
closing. Evaporator
flooded. Suction line
frosted to compressor.
Compressor drive belt Adjust belt tension.
slipping.
Magnetic clutch Check electrical circuit for
slipping. correct voltage to clutch coil.
Clean clutch surfaces of oil.
Leaking or broken com- Replace compressor.
pressor valves.
Gauge Indication Probable Causes Remedy
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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