Trane CGAH 250 - Page 13

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Cl Compressor
short-circuit
Suction
pressure
too
fow.
Drier
filter iced
up.
Drier
filter obstructed.
Replace.
Compressor
starts
and
stops rapidly
Motor
defective.
Replace
c<lmpressor.
keeps
running without stopping
Temperature
too
high in
areas
requiring Excess load on cooling
system.
air-conditioning.
Check thermal insulation
and
air-tightness
of areas relquiring
air-conditioning.
Bubbles
in
indicator. a)
Not enough refrigerant.
bl
Dehydration filter obstructed.
a) Repair leak. Add
more refrigerant.
b)
Replacer
filter cartridge.
Chilled
water temperature
output
too
high.
Excess
cooling demand
on
system.
Look
for
possible
causes of excess outside
air intake.
Check
quality
of insulation in
premises
requiring
air-conditioning, and
if
necessary
reduce
the water flow rate
through rergulation
valve.
Ai
El Loss
of
oil in compressor
Oil leveltoo
low in
indicator. Not
enough oil.
Add
oil.
Gradual
fall in oil level.
Drier filter
clogged.
Replace.
Aspiration
duct abnormally cold.
Compressor
noisy.
Liquid
flow
back to compressor.
Adjust
superheat
and check bulb fixing.
Fl Compressor
noisy
Compressor
knocks.
Components
broken
in
compressor. Change
cclmpressor.
Suction
duct abnormally cold.
a) Uneven liquid
flow.
b) Expansion
valve locked
in open
position.
a)
Check
superheat
setting and fixing
of
expansion
valva
bulb.
b) Repair
or replace.
G)
Not enough
power
in
system
.'
Thermostatic
expansion va
lve
'whistles'.
Not enough
refrigerant.
Add refrig;erant.
Excess
pressurre
drops through
drier
filter.
Drier filter
clogged.
Replace.
Excessive superheat.
Superheat
not
properly
adjusted.
Check adjrrstment
of
superheat and adjust
thermostatic
expansion
valve.
Insuffïcient water flow.
Chilled water
pipes
obstructed. Clean
pipes.
Insufficient superheat.
Pressu
re drops
through evaporator.
Check
adjrrstment
of
superheat and adjust
thermostatic
pressure
release.
Chilled
water
output
temperature
too
high,
Superheat
poorly
adjusted.
or too low, and
emulsion
in oil.
Adjust
the rmostatie
expa nsion
valve.
Che'ck
superheat.
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