Daikin Perfera FTXM71R - Page 96

3 | Components
Service manual
96
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
To perform an electrical check of the DC fan motor assembly
1 First perform a mechanical check of the DC fan motor assembly, see "Checking
procedures"[494].
2 Turn ON the power of the unit.
3 Activate Cooling or Heating operation via the user interface.
4 Check the functioning of the turbo fan.
Turbo fan … Action
Rotates continuously (without
interruption)
DC fan motor assembly is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
Does not rotate or rotates for a short
time
Continue with the next step.
5 Turn OFF the unit via the user interface.
6 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.
7 Check that the DC fan motor connector is properly connected to the indoor
unit main PCB.
8 Unplug the DC fan motor connector and measure the resistance between the
pins 1‑2, 1‑3, and 2‑3 of the DC fan motor connector.
Result: All measurements MUST be 84.9~97.7Ω.
9 Set the Megger voltage to 500VDC or 1000VDC.
10 Measure the insulation resistance for the motor terminals. Measurements
between each phase and fan motor body (e.g. axle) MUST be >1000MΩ.
Are the measured resistance values
correct?
Action
Yes Perform a check of the indoor unit main
PCB, see "Checking procedures"[4102].
No Replace the DC fan motor, see "Repair
procedures"[496].
Repair procedures
To remove the turbo fan assembly
Prerequisite: First perform pump down operation. Close the refrigerant circuit
stop valves when done.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "3.14Plate work"[4151].
2 Remove the switch box, see "3.14Plate work"[4151].
3 Remove the 2 screws and remove the upper air outlet assembly.