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Components
Service manual
117
(A)(F)TXF20~71A + FTXF20~25B + (A)(F)TXF20~42C + (A)(F)TXF20~42D +
(A)(F)TXF20~42E + (A)RXF20~71A + RXF20~60B + (A)RXF20~42C +
(A)RXF20~42D + (A)RXF20~42E
Split Sensira R32
ESIE18-12G – 2023.01
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 PCB.
8
Unplug the DC fan motor connector and measure the resistance between the
pins 1-3, 1-5, and 3-5 of the DC fan motor connector.
Result:
All measurements MUST be 83.2~92 Ω.
INFORMATION
Winding resistance values above are given for reference. You should NOT be reading
a value in kΩ or a short‑circuit. Make sure that the propeller fan blade does NOT
rotate, as this could affect resistance measurements.
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 main PCB, see
No
117].
Problem solved?
After all checking procedures listed above have been performed:
Is the problem solved?
Action
Yes
No further actions required.
No
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Repair procedures
To remove the propeller fan blade assembly
Prerequisite:
Stop the unit operation via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
1
Remove the required plate work, see
2
Remove the nut that fixes the propeller fan blade assembly.