Daikin VRV IV+ Service Manual page 312

3 | Components
To perform a mechanical check of the DC fan motor assembly
To perform an electrical check of the DC fan motor assembly
Service manual
312
One or both propeller fan blade
assemblies are damaged?
No
Prerequisite: First perform a mechanical check of the propeller fan blade
assembly, see "Checking
1 Manually rotate the fan motor shaft. Check that it rotates smoothly.
2 Check the friction of the DC fan motor shaft bearing.
Is the DC fan motor shaft friction
normal?
Yes
No
1 First perform a mechanical check of both DC fan motor assemblies, see
"Checking procedures" [
2 Turn ON the power of the unit.
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 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 connectors (X1A on A4P for M1F and X1A on A7P
for M2F) are properly connected to the PCB.
8 Unplug the DC fan motor connectors X1A of both fans and measure the
resistance between the pins 1–2, 1–3, and 2–3 of the DC fan motor
connectors.
Result: All measurements MUST be 4.44°Ω±5% at 20°C.
Action
Perform a mechanical check of the DC
fan motor assembly, see
procedures" [
4
procedures" [ 311].
Action
Perform an electrical check of the DC
fan motor assembly, see
procedures" [
Replace the DC fan motor assembly, see
"Repair
4
311].
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].
"Checking
4
311].
"Checking
4
311].
4
procedures" [ 313].
"To check the
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05