9-3. Checking the Outdoor System
9-3-1. Checking the outdoor unit
• Apply 220 V AC between terminals 1 and 2 on the
outdoor unit 3P terminal block.
• Of the connector T-RUN/TEST terminals, short-circuit
the T-RUN terminal to the COM terminal.
NOTE: If the above check items are okay, but the outdoor unit does not operate, there may be a faulty connection between
the indoor unit and the outdoor unit.
ControlNo.
1
2
• The LED (red) on the control circuit board must
illuminate.
• The compressor, fan motor, 4-way valve, and solenoid
valve (for the hot gas bypass) must turn ON.
(They turn ON a few seconds after the power is turned
ON.)
NOTE:
The dashed line for the defrost or clean defrost lamp
indicates lamp illumination at clean defrost only.
• The maximum length of defrost operation is 12
minutes.
Defrost can also be ended based on the below
conditions for the outdoor heat exchanger sensor.
Less than 2 minutes → Not ended
2 minutes or more → 10°C or higher
(However, the condition is 7°C or higher when the
outdoor air temperature is below 0°C.)
Check items (unit operation)
9-3-2. Using forced defrost procedure
• Connect a dummy resistor of 39 kΩ to the outdoor coil
temperature sensor connector.
ControlNo.
1
■ Non-stop defrost
Check items (unit operation)
Indoor fan
CM
ON
120 Hz
ON OFF
OFF
(ON)
ONON
OFF
Setting
LL
Stop
30 sec.
5 sec.
Stop Stop
LL LL
Defrost start End
Solenoid valve
(for hot gas
bypass)
Outdoor fan
Defrost or
clean defrost
lamp
10 sec.
Setting
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