Daikin VRV IV+ Service Manual page 308

3 | Components
Problem solved?
Repair procedures
To remove the propeller fan blade assembly
Service manual
308
3 Activate Cooling or Heating operation via the Cool/Heat master 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
5 Stop the unit operation via the central controller.
6 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see
rectifier voltage" [
7 Check that the DC fan motor connector X1A is properly connected to the 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 8.27 Ω±5% at 20°C.
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 Measure the insulation resistance for the motor terminals. Measurements
between each phase and ground must be >1°MΩ.
Are the measured resistance values
correct?
Yes
No
After all checking procedures listed above have been performed:
Is the problem solved?
Yes
No
Prerequisite: Stop the unit operation via the central controller.
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.
4
356].
Action
Perform a check of the fan inverter PCB,
see "Checking
Replace the DC fan motor, see
procedures" [
Action
No further actions required.
Return to the troubleshooting of the
specific error and continue with the
next procedure.
"To check the
4
procedures" [ 259].
"Repair
4
308].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05