Piper SARATOGA PA-32-301 Maintenance Manual page 113

1E17
PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 2102. TROUBLESHOOTING (AIR CONDITIONER)
Gauge Indication Probable Causes Remedy
High discharge pressure. Overcharge of refriger-
ant.
Purge excess refriger-
ant.
Air in system.
Overheated condenser due
to blocking air passage.
Flooded evaporator indi-
cated by heavy frosting
on suction line and com-
pressor suction service
valve.
Restriction in liquid line
from condenser.
Check for leaks. Bleed
charge from system.
Evacuate and recharge
system.
Clean bugs and dirt
from condenser fins.
Straighten fins if
bent.
Check that capillary bulb
is securely clamped to
suction line. If capil-
lary bulb OK replace
expansion valve.
Check for kinked hoses and
stopped up filter.
Low discharge pressure. Undercharge of refriger-
ant. Sight glass shows
bubbles or foam.
Add refrigerant until
bubbles disappear. Check
system leaks.
Damaged compressor valves
or dirt under valves.
Damaged compressor. Worn
or broken piston or
piston rings.
Replace compressor.
Replace compressor.
Low suction pressure.
Accompanied by icing
evaporator.
Low air supply through
evaporator.
Repair blower or blower
motor. Clean stoppage in
air ducts.
Very dirty evaporator
fins and coils.
Clean and flush with
water.
21-52-00
Page 21-07
Revised: August 11, 1983