Piper Arrow IV Turbo Maintenance Manual page 121

CHART 2101. TROUBLESHOOTING (AIR CONDITIONER)
Gauge Indication
High discharge pressure.
Low discharge pressure.
Low suction pressure.
(Accompanied by icing
evaporator.)
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Probable Causes
Overcharge of refrigerant.
Air in system.
Overheated condenser due
to blocking air passage.
Flooded evaporator indi-
cated by heavy frosting on
suction line and compressor
suction service valve.
Restriction in liquid line
from condenser.
Undercharge of refrigerant.
Sight glass shows bubbles
or foam.
Damaged compressor
valves or dirt under valves.
Damaged compressor.
Worn or broken piston or
piston rings.
Low air supply through
evaporator.
Very dirty evaporator fins
and coils.
1F1
Remedy
Purge excess refrigerant.
Check for leaks. Bleed
charge from system. Evac-
uate and recharge system.
Clean bugs and dirt from
condenser fins. Straighten
fins if bent.
Check that capillary bulb
is securely clamped to suc
tion line. If capillary bulb
OK replace expansion valve.
Check for kinked hoses and
stopped up filter.
Add refrigerant until bub-
bles disappear. Check sys-
tem leaks.
Replace compressor.
Replace compressor.
Repair blower or blower
motor. Clean stoppage in
air ducts.
Clean and flush with
water.
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Page 21-02
December 1, 1978