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Service Manual -
VMH 9/12/18/24 SU & VMH30/36S D Series
31
34
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
m
otor connector. If the value of the voltage is not in the range showing in below table, the
PCB
h
as problems and need
s
to be replaced.
2.
Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on,
and check if the fan runs normally
. I
f 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.
DC motor voltage input and output(voltage: 220-240V~)
NO.
Color
Signal
Voltage
1
Red
Vs/Vm
280V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
14-17.5V
5
Yellow
Vsp
0~5.6V
6
Blue
FG
14-17.5V
DC motor voltage input and output(voltage :115V~)
NO.
Color Signal
Voltage
1
Red
Vs/Vm
140V~190V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
14-17.5V
5
Yellow
Vsp
0~5.6V
6
Blue
FG
14-17.5V