Fujitsu ACUH09LUAS1, Service Manual

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4-4. Indoor unit fan motor
¢ Models: ACUH09LUAS1, ACUH12LUAS1, and ACUH18LUAS1
Check point 1. Check rotation of fan
Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)
If fan or bearing is abnormal, replace it.
Check point 2. Check resistance of indoor fan motor
Refer to below. Circuit-test “Vm” and “GND” terminal
NOTE: Vm: DC voltage, GND: Earth terminal
If they are short-circuited (below 300 kΩ), replace indoor fan motor and controller PCB.
Pin number
(wire color)
Terminal function
(symbol)
1 (Red) DC voltage (Vm)
2 No function
3 (Black) Ground terminal (GND)
4 (→hite) Control voltage (Vcc)
5 No function
6 No function
7 (↔ellow) Speed command (Vsp)
8 (Brown) Feed back (FG)
4-4. Indoor unit fan motor
- (03-50) -
4. Service parts information
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G