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Optional Function
4.2.3 Input Outdoor Fan Motor Start/Stop (Control Function No.4)
This is an auxiliary function to protect the outdoor unit from snow. When the input terminals for Outdoor Fan Motor Start/Stop
on the outdoor unit PCB are short-circuited during the compressor stoppage, all the outdoor fan motors start operating. If the
compressor restarts operating, the outdoor fan motors will be restored to normal operation. If the input terminals of Outdoor
Fan Motor Start/Stop are opened during the outdoor fan motor operation following the short circuit of these terminals, the
outdoor fan motor will stop.
This function is available only during the compressor stoppage (during the compressor power-OFF or thermo-OFF of the
compressor power-ON) and the ambient temperature must greater than or equal to 50°F(10°C).
Therefore, this function will not be available even if the input signal is sent during the normal cooling or heating operation. An
example of basic wiring when Outdoor Fan Motor Start/Stop (Input 2) is set to 2 and 3 pins of CN17 by an external signal is
shown below.
• Setting Example
Outdoor Fan Motor Start/Stop at Input 2 (between 2 and 3 pins of CN17)
X1: Auxiliary Relay
SS3: Snow Sensor Switch
X1
Control Circuit
X1
2
3
1
2
3
3P Connector
Outdoor Unit
PCB
CN17
SS3
Power
Supply
Wiring Diagram Example of Outdoor Fan Motor Start/Stop
NOTE:
1. This is an auxiliary function to protect the unit from snow. In snowy regions, make sure to protect the unit with a snow-
prevention roof, fence or snow-prevention hood (Field-Supplied), etc.. Otherwise, abnormal vibrations due to imbalanced
propeller fan will be caused.
2. If the fan motor or fan controller fail during the outdoor fan motor start/stop operation, stop all the outdoor fan motor to
suspend the operation. Check the alarm code and deal properly with the failure next time the compressor is operated.
3. When setting the snow sensor switch for Outdoor Fan Motor Start/Stop, make sure that the continuous operating time is
30 seconds or more. Also the outdoor fan motor start/stop intervals shall be at least 10 minutes. Otherwise, malfunction of
the outdoor fan motors will be caused by frequent start/stop.
Because of this setting, the outdoor fan can operate even while the outdoor unit (compressor)
stops. Display a notice to that eect on a readily visible part of the unit body, in order to avoid
injuries caused by an unintended outdoor fan operation.
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