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8-3-1. Checking the outdoor unit
8-3. Checking the Outdoor System
8-3-2. Checking the defrost operation
Work procedure
Apply 220 V AC between terminals L and N on the
outdoor unit terminal plate.
•
Short-circuit the T-RUN terminal to the COM terminal
of TEST/T-RUN terminals.
•
The LED (red) on the control board must illuminate.•
The compressor, fan motor, 4-way valve, and solenoid
valve (for the hot gas bypass) must turn ON.
(They turn ON about (70) seconds later after the power
is turned ON.)
•
No.
1
2
Check items (unit operation)
Work procedure
Connect a dummy resistor of 39 k ohm to the outdoor
coil temperature sensor connector.
• Non-stop defrost
The maximum length of defrost operation is 12
minutes.
Defrost can also be released based on the below
conditions for the outdoor heat exchanger sensor.
However, the condition is (20 °C) or higher when the
outdoor air temperature is below 0 °C.
*1
(*1)
Less than 2 minutes Not released
2 minutes or more 14 °C or higher
•
No.
1
Check items (unit operation)
Indoor fan
Outdoor fan
CM
Solenoid valve
(for hot gas
bypass)
30 sec.
10 sec.5 sec.
(80 Hz)
ON
ONOFF OFF
OFFON
Defrost start Release
ON
Setting Setting
LL
Stop
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.
Using forced defrost operation to check this function.
73