Daikin FTXA20A Service Manual page 116

2 | Components
To perform an electrical check of the DC fan motor assembly
Service manual
116
Is the DC fan motor shaft friction
normal?
No
1 First perform a mechanical check of the DC fan motor assembly, see
4
procedures" [ 115].
INFORMATION
Check the DC fan motor power supply (voltage) circuit on the PCB.
2 Turn ON the power of the unit.
3 Activate Cooling or Heating operation via the user interface.
4 Check the functioning of the outdoor unit fan.
Outdoor unit fan ...
Rotates continuously (without
interruption)
Does not rotate or rotates for a short
time
INFORMATION
The DC fan motor connector MUST be plugged into the appropriate PCB.
5 Confirm via the service monitoring tool that the DC fan motor assembly
receives an ON signal.
6 Turn OFF the unit via the user interface.
7 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
8 Disconnect the DC fan motor connector S70 and measure the resistance on
the connector pins shown below. The measured resistance MUST be:
VDC Comm
4 1
4 2
4 3
4 7
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
Action
Replace the DC fan motor assembly, see
"Repair procedures" [
Action
DC fan motor assembly is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
Continue with the next step.
Resistance VDC
OL 1
108 kΩ 2
1.2 kΩ 3
OL 7
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
4
118].
"Checking
Comm Resistance
4 OL
4 108 kΩ
4 1.2 kΩ
4 OL
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05