Daikin VRV IV+ Service Manual page 274

3 | Components
3.10 Inverter PCB
3.10.1 Checking procedures
To perform a power check of the inverter PCB
To check the HAP LED of the inverter PCB
Service manual
274
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
Prerequisite: Access the switch box, see
1 Turn ON the power of the unit.
2 Measure the voltage between the following wires on the inverter PCB.
Result: All measurements MUST be 400 V AC.
▪ L1B –L2B
▪ L1B –L3B
▪ L2B –L3B
a b
a Wire L1B
b Wire L2B
c Wire L3B
Does the inverter PCB receive power?
Yes
No
3 Perform an electrical check of the noise filter PCB, see
4
procedures" [ 298].
1 First perform a power check of the inverter PCB, see
4
procedures" [ 274].
INFORMATION
Make sure that the inverter PCB is NOT in stand‑by mode. The HAP LED will NOT
blink when in stand‑by mode.
2 If needed wake up the PCB by performing one of the following actions:
"3.15 Plate
c
Action
Return to
procedures" [
and continue with the next procedure.
Continue with the next step.
4
"3.15 Plate work" [ 315].
4
work" [ 315].
"3.10.1 Checking
4
274] of the inverter PCB
"3.12.1 Checking
"3.10.1 Checking
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05