Daikin VRV IV+ Service Manual page 93

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Is the measured voltage on the
PCB correct?
Yes
No
To check the HAP LED of the fan inverter PCB
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Turn ON the power of the unit.
2 Locate the HAP LED on the fan inverter PCB.
a
a HAP LED
Does the HAP LED blink in
regular intervals
(approximately 1 Hz)?
Yes
No
To check if the correct spare part is installed
1 Visit your local spare parts webbank.
2 Enter the model name of your unit and check if the installed
spare part number corresponds with the spare part number
indicated in the webbank.
Is the correct spare part for the
fan inverter PCB installed?
Yes
No
To check the wiring of the fan inverter PCB
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
"6.2 Wiring diagram" on page 146.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
Action
Return to "Checking
procedures" on page 92 of the
PCB and continue with the next
procedure.
See "3.8.1 Checking
procedures" on page 99 of the
inverter PCB.
"3.13 Plate
Action
Return to "Checking
procedures" on page 92 of the
fan inverter PCB and continue
with the next procedure.
Replace the fan inverter PCB,
see "Repair procedures" on
page 94.
Action
Return to "Checking
procedures" on page 92 of the
fan inverter PCB and continue
with the next procedure.
Replace the fan inverter PCB,
see "Repair procedures" on
page 94.
Is the wiring on the fan inverter
PCB correct?
Yes
No
To check the fuse of the fan inverter PCB
1 Measure the continuity of the fuse. If no continuity is measured,
the fuse is blown.
a Fuse
Blown fuse on the fan inverter
PCB?
Yes
No
To perform a power transistor check of the fan inverter PCB
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Set the multimeter to diode measurement.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
2 Check the fan inverter PCB in reference with the tables below.
a
a Fan inverter PCB A4P
b Connector P11
c Connector N11
3 Components
Action
Return to "Checking
procedures" on page 92 of the
fan inverter PCB and continue
with the next procedure.
Adjust the wiring of the fan
inverter PCB, see "Repair
procedures" on page 94.
a
Action
Replace the fan inverter PCB,
see "Repair procedures" on
page 94.
Return to "Checking
procedures" on page 92 of the
fan inverter PCB and continue
with the next procedure.
"3.13 Plate
c d e f
b
Service manual
93