Daikin VRV IV+ Service Manual page 292

3 | Components
To check the wiring of the main PCB
To check the fuses of the main PCB
Service manual
292
Is the correct spare part for the main
PCB installed?
Yes
No
Prerequisite: First perform all earlier checks of the main PCB, see
4
procedures" [ 290].
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
1 Check that all wires are properly connected and that all connectors are fully
plugged‑in.
2 Check that no connectors or wires are damaged.
3 Check that the wiring corresponds with the wiring diagram, see
4
diagram" [ 385].
4 Check that the bridge connector X4A is plugged in, see
4
diagram" [ 385].
INFORMATION
Correct the wiring as needed.
Is the problem solved?
Yes
No
Prerequisite: First perform all earlier checks of the main PCB, see
4
procedures" [ 290].
1 Measure the continuity of the fuse. If no continuity is measured, the fuse has
blown.
a
a
a Fuse
Any blown fuses on the main PCB?
Yes
Action
Return to "3.11.1 Checking
4
procedures" [ 290] of the main PCB
and continue with the next procedure.
Replace the main PCB,
4
procedures" [ 293].
Action
No further actions required.
Return to "3.11.1 Checking
4
procedures" [ 290] of the main PCB
and continue with the next procedure.
Action
Replace the blown fuse(s), see
"3.11.2 Repair procedures." [
"3.11.2 Repair
"3.11.1 Checking
"6.2 Wiring
"6.2 Wiring
"3.11.1 Checking
4
293]
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05