Daikin VRV IV+ Service Manual page 290

3 | Components
3.11 Main PCB
3.11.1 Checking procedures
To perform a power check of the main PCB
To check the power supply to the optional PCB
Service manual
290
INFORMATION
It is recommended to perform the checks in the listed order.
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 Turn ON the power of the unit.
2 Measure the voltage between the following wires on connector X1A of the
main PCB. All measurements MUST be 230 V AC±10%.
▪ L3 (pin 1)–N (pin 5)
▪ L1 (pin 3)–N (pin 5)
a
a Connector X1A
Does the main PCB receive power?
Yes
No
3 Check the power supply to the unit, see
Does the unit receive power?
Yes
No
Prerequisite: First perform all earlier checks of the main PCB, see
4
procedures" [ 290].
1 Turn ON the power of the unit.
2 Measure the voltage on connector X37A of the main PCB. The measurement
MUST be 16 V DC.
"3.15 Plate work" [
Action
Return to "3.11.1 Checking
4
procedures" [ 290] of the main PCB
and continue with the next procedure.
Continue with the next step.
"4.1.1 Checking procedures" [
Action
Correct the wiring from the main power
supply terminal to the main PCB, see
"3.11.2 Repair procedures" [
Adjust the power supply to the unit, see
"4.1.2 Repair procedures" [
4
315].
4
356].
4
293].
4
361].
"3.11.1 Checking
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05