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Insufficient cooling(Both compressor and compressor operate)
too high
Check the temperature setting.
OK
dirty
Check the air filter.
not dirty
there is
Is there high heat source or
any object restricting heat
radiation near the unit.
there isn't
open
Check doors and windows.
close
dirty
Check the outdoor and indoor
heat exchanger.
not dirty
Undersized air conditioner
Calculate heat load wit using
Cooling load estimate form.
OK
Check rotating direction of
NG
centrifugal fan.(to clockwise)
OK
NG
Check changing fan speed
properly.
OK
over 40 ˚ C
Is the outdoor temperature
too high ?
under 40 ˚ C
NG
Check the thermister.
OK
under 10 ˚ C
Measure temperature difference
between inlet and outlet air at indoor.
over 10 ˚ C
Checking complete.
Set the lower temperature.
Clean the air filter.
Remove the high heat
source or stop.
Doors and windows
must be kept closed.
Clean them with steam
cleaner or another method.
Change unit to proper
sized air conditioner.
NG
Check the fan motor connector.
OK
NG
Measure the resistance
of fan motor coil.
OK
Change the fan motor.
Avoid sun light and ventilate well for
outdoor heat exchanger.
Change the thermister.
Is frost sticking to capillary tube ?
Or is indoor heat exchanger no cold ?
NO
Connect properly.
YES
Is the refrigerant leaked ?
NO
The capillary tube restrict,
and change the capillary tube.
Measure the emperature
difference between discharge
tube and suction tube.
temperature difference
29
YES
Repair leakage and recharge
the refrigerant.
No temperature difference
The compressor is defective.
Change the compressor.
AF-S80CX
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