Daikin VRV IV+ Service Manual page 276

3 | Components
To check the fuses of the inverter PCB
To check the rectifier voltage of the inverter PCB
Service manual
276
2 Check that all wires are properly connected and that all connectors are fully
plugged‑in.
3 Check that no connectors or wires are damaged.
4 Check that the wiring corresponds with the wiring diagram, see
4
diagram" [ 385].
INFORMATION
Correct the wiring as needed.
Is the problem solved?
Yes
No
Prerequisite: First perform all earlier checks of the inverter PCB, see
"3.10.1 Checking procedures" [
1 Measure the continuity of the fuse. If no continuity is measured, the fuse has
blown.
a
a Fuse
Any blown fuses on the inverter PCB?
Yes
No
Prerequisite: First perform all earlier checks of the inverter PCB, see
"3.10.1 Checking procedures" [
1 Turn ON the power of the unit.
For single fan units
2 Measure the voltage on the rectifier voltage check connector (a) X3A, located
above the power terminal assembly (b).
Result: The measured voltage should be approximately 560 V DC.
Action
No further actions required.
Return to "3.10.1 Checking
procedures" [
and continue with the next procedure.
4
274].
Action
Replace the inverter PCB, see
"3.10.2 Repair
Return to "3.10.1 Checking
procedures" [
and continue with the next procedure.
4
274].
"6.2 Wiring
4
274] of the inverter PCB
4
procedures" [ 282].
4
274] of the inverter PCB
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05