Piper Lance II - Page 558

LANCE
II
SERVICE
MANUAL
TABLE
XIV-IV.
TROUBLESHOOTING
CHART
(AIR CONDITIONER)
(cont.)
Gauge Indication
Probable
Causes
Remedy
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.
Low suction pressure.
(Evaporator
not cold
enough) suction gauge
may
read a
vacuum
in-
dicating
evaporator
lacks
refrigerant.
Undercharge of
refrigerant.
Moisture
freezing in expansion
valve. Valve
will
show
frost. Expansion valve
inlet screen clogged.
Inoperative expansion
valve. Valve stuck
closed or capillary
bulb has lost its
charge.
Add refrigerant.
Install new dryer.
Evacuate
and
recharge
14-13 and 14-14.
Remove screen.
Clean with solvent
and replace. Warm
capillary by holding
in hand.
If suction
pressure does not
charge, replace ex-
pansion
valve.
Restriction
anywhere
in liquid line. Re-
striction will show
frost.
Locate restriction and
repair.
High suction pressure.
Capillary bulb clamp
loose
on suction
line.
Suction line shows
frost.
Clean contact surfaces
of suction line and
cap bulb. Tighten
clamp.
Expansion valve not
closing.
Evaporator
flooded. Suction line
frosted to compressor.
2L6
Replace expansion
valve.
ACCESSORIES AND UTILITIES
Issued:
1/3/78