Piper Navajo Chieftain PA-31-350 Service Manual page 918

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XIV-XV. TROUBLESHOOTING CHART (AIR CONDITIONER) (cont)
Trouble
Cause
Remedy
System will not
produce sufficient
cooling.(cont.)
Mechanical
Evaporator clogged.
Clean with compressed
air. Use cleaning
solvent to remove
cigarette tars.
Insufficient air
circulation over
condenser coils;
fins clogged with
dirt or bugs.
Clean condenser.
coils.
Refrigeration
Insufficient re-
frigerant in sys-
tem.
Clogged screen
in expansion
valve.
Expansion valve
thermal bulb has
lost charge.
Clogged screen
in receiver.
Excessive moisture
in system.
Air in system.
Recharge system until
bubbles disappear in
receiver and gauge
readings stabilize to
specifications.
Purge system and re-
place expansion valve.
Purge system; replace
expansion valve.
Purge system; replace
receiver.
Purge system; replace
receiver.
Purge, evacuate, and
charge system.
(Replace receiver.)
NOTE
When a unit must be removed from the system for service or
replacement, the system must have the dehydrator replaced also,
and the system must be purged, evacuated, and recharged to
remove excess moisture.
Reissued: 9/23/80
412
ACCESSORIES AND UTILITIES