Air Conditioning Troubleshooting - Piper PA-32R-301 SARATOGA SP Maintenance Manual

COOLING (cont.)
C. Air Conditioner Troubleshooting.
Probable troubles peculiar to the air conditioner system components covered in this chapter are listed
in Chart 1, along with their probable causes and suggested remedies. After the trouble has been cor-
rected, check the entire system for security and operation of its components.
Environmental regulations may require use of a collection
system when necessary to evacuate freon from system
Check all environmental regulations for your local area before
servicing air conditioning system
Gauge Indication
High discharge pressure
Low discharge pressure
Low suction pressure
accompanied by icing
of evaporator.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
— CAUTION —
— NOTE —
CHART 1
Air Conditioner Troubleshooting (Sheet 1 of 5)
Probable Causes
Overcharge of refrigerant
Air in system.
Overheated condenser due to
blocking air passage.
Flooded evaporator indicated 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.
1H18
Remedy
Purge excess refrigerant.
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 capillary bulb OK
replace expansion valve
Check for kinked hoses and
stopped up filter.
Add refrigerant until bubbles
disappear. Check system for
leaks.
Replace compressor.
Replace compressor.
Repair blower or blower
motor. Clean stoppage in air
ducts.
Clean and flush with water
21-50-00
Page 21-11
Reissued: July 1, 1993