Daikin VRV IV+ Service Manual page 100

3 Components
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
inverter PCB installed?
Yes
No
To check the wiring of the 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.
Is the wiring on the inverter
PCB correct?
Yes
No
To check the fuses of the inverter PCB
1 Measure the continuity of the fuse. If no continuity is measured,
the fuse is blown.
a
a Fuse
Any blown fuses on the
inverter PCB?
Yes
Service manual
100
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
Action
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
Replace the inverter PCB, see
"3.8.2 Repair procedures" on
page 103.
Action
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
Replace the inverter PCB, see
"3.8.2 Repair procedures" on
page 103.
Action
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
Adjust the wiring of the inverter
PCB, see "3.8.2 Repair
procedures" on page 103.
Action
Replace the inverter PCB, see
"3.8.2 Repair procedures" on
page 103.
Any blown fuses on the
inverter PCB?
No
To check the rectifier voltage of the inverter PCB
1 Stop the unit operation (via the user interface, operation switch,
...).
For single fan units
2 Measure the voltage on the rectifier voltage check connector (a)
X3A, located above the power terminal assembly (b). The
measured voltage should be approximately 560 V DC.
a
a Connector X3A
b Power terminal assembly
For double fan units
3 Measure the voltage on the rectifier voltage check connector (a)
X5A to check inverter PCB A3P (c). The measured voltage
should be approximately 560 V DC.
4 Measure the voltage on the rectifier voltage check connector (b)
X6A to check inverter PCB A6P (d). The measured voltage
should be approximately 560 V DC.
b
a Connector X5A
b Connector X6A
c Inverter PCB A3P
d Inverter PCB A6P
Is the measured voltage
approximately 560 V DC?
Yes
Action
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
b
d c
a
Action
Diode module and power module
are OK. Perform a power
transistor check of the inverter
PCB, see "3.8.1 Checking
procedures" on page 99.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07