3
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Components
Service manual
290
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
3.11 Main PCB
3.11.1 Checking procedures
INFORMATION
It is recommended to perform the checks in the listed order.
To perform a power check of the main PCB
Prerequisite:
Stop the unit operation via the central controller.
Prerequisite:
Turn OFF the respective circuit breaker.
Prerequisite:
Remove the required plate work, see
315].
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?
Action
Yes
and continue with the next procedure.
No
Continue with the next step.
3
Check the power supply to the unit, see
Does the unit receive power?
Action
Yes
Correct the wiring from the main power
supply terminal to the main PCB, see
No
Adjust the power supply to the unit, see
361].
To check the power supply to the optional PCB
Prerequisite:
First perform all earlier checks of the main PCB, see
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.
Summary of Contents for VRV IV+
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