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1.1.7 ABNORMALITIES OF DEVICES (Cont.)
Phenomenon
Indoor Cool Load is Greater
Insufficient
Cooling
Operation
Excessively
Low Suction
*1): Refer to Item 16.6 of TC
Cause
than Cooling Capacity
Gas Leakage
or Shortage
of Refrigerant
Excessively
Small Diameter
Tube or Long
Piping
Incorrect
Activation of
Check Valve of
Outdoor Unit
Failure or
Malfunction of
Expansion
Valve
Pressure
Clogged
Capillary Tube
in Indoor Unit
Clogged
Strainer in
Indoor Unit
Clogging at
Low Pressure
Piping
Clogging at
Low Pressure
Piping
Insufficient
Air Flow to
Indoor Unit
Heat
Exchanger
Excessively
Low Air
Temp. to
Indoor Unit
Heat
Exchanger
TROUBLESHOOTING
Check Item
Calculate Cool load.
Measure Superheat.
Measure and check field-
supplied pipes.
Check whether or not
temp. difference exists
before/after check valve.
Check for clogging.
Check for connection cord
and connector.
Is there operation sound
from coil?
Is thermistor on
compressor normal?
Is thermistor installed
correctly on compressor?
Is there dewing after
capillary tube?
Check temp. difference at
inlet and outlet of strainer.
Check temp. difference.
Check for clogged air filter.
Check for obstacle at inlet
or outlet.
Insufficient revolution of
indoor unit Fan motor?
Short-circuited indoor unit
air?
1
13
Action
(Turn OFF main switch)
Use a bigger unit.
Correctly charge
refrigerant after repairing
gas leakage.
Use correct pipes.
Replace check valve for
outdoor unit.
Remove clogging.
Replace connector.
Replace coil.
Replace thermistor.
Correctly install it.
Replace capillary tube in
indoor unit.
Replace strainer in indoor
unit.
Remove clogging.
Clean air filter.
Remove obstacles.
Replace fan motor.
Remove cause of short-
circuited air.
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Table of Contents
Troubleshooting
