Service manual

22
AF-R100CX
AF-R120CX
Insufficient cooling(Both compressor and compressor operate)
Check the temperature setting.
too high
dirty
dirty
not dirty
not dirty
OK
close
OK
NG
NG
Undersized air conditioner
there is
there isn't
open
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.
Check the fan motor connector.
Measure the resistance
of fan motor coil.
Change the fan motor.
Connect properly.
Avoid sun light and ventilate well for
outdoor heat exchanger.
Change the thermister.
Is the refrigerant leaked ?
Repair leakage and recharge
the refrigerant.
The compressor is defective.
Change the compressor.
The capillary tube restrict,
and change the capillary tube.
Measure the emperature
difference between discharge
tube and suction tube.
Is frost sticking to capillary tube ?
Or is indoor heat exchanger no cold ?
Check the air filter.
Is there high heat source or
any object restricting heat
radiation near the unit.
Check doors and windows.
Check the outdoor and indoor
heat exchanger.
Calculate heat load wit using
Cooling load estimate form.
Check rotating direction of
centrifugal fan.(to clockwise)
Check changing fan speed
properly.
Is the outdoor temperature
too high ?
Check the thermister.
Measure temperature difference
between inlet and outlet air at indoor.
Checking complete.
OK
OK
NG
NG
OK
OK
NG
NO
NO
YES
YES
No temperature difference
temperature difference
OK
over 40ûC
under 10ûC
over 10ûC
under 40ûC