Piper PA-44-180 SEMINOLE Maintenance Manual page 163

CHART 2104. TROUBLESHOOTING (AIR CONDITIONER)
Trouble
System will not produce
sufficient cooling. (cont.)
Excessively noisy system.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Causes
Electrical (cont.)
Insufficient air circulation over
condenser coils, fins clogged
with dirt or bugs.
Evaporator filter clogged.
Refrigeration.
Insufficient refrigerant in
system.
Clogged screen in expansion
valve.
Expansion valve thermal bulb
has lost charge.
Clogged screen in receiver
dehydrator.
Excessive moisture in system.
Air in system.
Electrical.
Defective winding or improper
connection in compressor.
clutch coil.
Mechanical.
Loose or excessively worn drive
belts.
Noisy clutch.
1G19
Remedy
Clean condenser coils.
Clean with cleaning solvent to
remove cigarette tars.
Recharge system until bubbles
disappear in receiver dehydrator
and gauge readings stabilize to
specifications.
Purge system and replace
expansion valve.
Purge system, replace expansion
valve.
Purge system; replace receiver
dehydrator.
Purge system; replace receiver
dehydrator.
Purge, evacuate and charge
system (Replace receiver
dehydrator.)
Replace or repair as necessary.
Tighten or replace as required.
Remove clutch for service or
replacement as necessary.
Page 21-52
Revised: May 15, 1989
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