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Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
Index 1:
1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan
motor connector. If the value of the voltage is not in the range showing in below table, the
PCB has problems and needs to be replaced.
DC motor voltage input and output(voltage: 220-240V~)
NO.
Color
1
Red
2
3
Black
4
White
5
Yellow
6
Blue
DC motor voltage input and output(voltage :115V~)
NO.
Color
1
Red
2
3
Black
4
White
5
Yellow
6
Blue
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on, and check if the fan runs normally. If the fan runs normally, the PCB has problems and
needs to be replaced, If the fan does not run normally, measure the resistance of each two pins.
If the resistances are not equal to each other, the fan motor has problems and needs to be
replaced, otherwise the PCB has problems and needs to be replaced, otherwise the PCB has
problems and needs to be replaced.
3. Indoor AC Fan Motor
Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds,
measure the voltage of pin1 and pin 2. If the value of the voltage is less than 100V, the PCB has
problems and needs to be replaced.
Signal
Vs/Vm
---
---
GND
Vcc
Vsp
FG
Signal
Vs/Vm
140V~190V
---
---
GND
Vcc
Vsp
FG
Voltage
280V~380V
---
0V
14-17.5V
0~5.6V
14-17.5V
Voltage
---
0V
14-17.5V
0~5.6V
14-17.5V
31
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