COMFORT-AIRE B-SVH24SA-1 Service Manual page 38

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
must be replaced.
DC motor voltage input and output (voltage: 220-240V~)
NO. Color Signal
1 Red Vs/Vm
2 --- ---
3 Black GND
4 White Vcc
5 Yellow Vsp
6 Blue FG
DC motor voltage input and output (voltage :115V~)
NO. Color Signal
1 Red Vs/Vm
2 --- ---
3 Black GND
4 White Vcc
5 Yellow Vsp
6 Blue FG
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on, and check if the fan can run normally, if the fan can run normally, the PCB must be
replaced, If the fan can't run normally, measure the resistance of each two pins. If the resistance is
not equal to each other, the fan motor must be replaced, otherwise the PCB must 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 pin2. If the value of the voltage is less than 100V (208~240V
power supply) or 50V (115V power supply), the PCB must be replaced.
Voltage
280V~380V
---
0V
14-17.5V
0~5.6V
14-17.5V
Voltage
140V~190V
---
0V
14-17.5V
0~5.6V
14-17.5V
38
Service Manual - SVH 09/12/18/24 Series