Raytheon Beech Baron E55 - Troubleshooting Air Conditioning System

MSlYINleOn
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
CHART
3
TROUBLESHOOTING
AIR
CONDITIONING SYSTEM
(TE-1119,
TE-1125
AND
AFTER;
TH-873,
TH-895
AND
AFTER)
I
PROBLEM
PROBABLE
CAUSE
CORRECTIVE
ACTION
1.
Insufficient
cooling,
i
a.
Blower
not
functioning,
a.
Repair.
b.
Obstructed
or
disconnected
air
b.
Remove
obstruction
or
repair.
duct.
c.
Compressor
clutch
or
belt
c.
Repair
or
adjust.
slipping.
d.
Evaporator
filter
clogged,
d.
Replace.
e.
Refrigerant
level
low,
e.
Leak-test
and
recharge.
2.
No
cooling,
a.
Blown
fuse,
loose
connection,
a.
Check
connections,
fuse,
I
continuity
and
proper
adjustment
of
expansion
valves.
b.
Blower
not
functioning.
b.
Repair.
c.
Leak in
system,
c.
Leak-test
and
recharge.
d.
Compressor
valves
inoperative,
d.
Repair
or
replace.
e.
Slipping
or
broken
belt,
e.
Tighten
or
replace.
3.
Excessive
vibration
of unit.
a.
Overcharged.
a.
Correct
refrigerant
charge.
b. Air in
system.
b.
Purge
and
recharge
system.
I
c.
Mount
or
compressor
bolts
loose
c.
Tighten
or
replace.
or
broken.
d. Drive
pulley
loose.
d.
Tighten.
4.
Noisy
unit.
a.
Compressor
oil level
low.
a.
Add
oil.
b.
Faulty
belt.
b.
Replace.
c.
Low
refrigerant
level,
c.
Add
refrigerant.
d.
Fan
hitting
shroud.
d.
Align
and
tighten
shroud.
e.
Faulty
compressor.
e.
Replace.
5.
Hissing
in
evaporatormoduie.
a,
Low
charge,
a.
Add
refrigerant.
6.
Chatter
or
knock in
evaporator
a.
Faulty
expansion
valve.
a.
Replace.
module.
7.
Belt
slipping,
a.
Loose.
a.
Adjust.
b.
Overcharge.
b.
Correct
refrigerant
level.
c.
Air
in
system,
c.
Evacuate and
recharge.
8.
Excessive
beltwear.
a.
Pulleys
not
in
line.
a.
Align
pulleys.
b. Belt
too
tight,
b.
Adjust
or
replace.
Jun
27/03Page
38
SECTION
10