Main Pcb; Checking Procedures - Daikin VRV IV+ Service Manual

3 Components
22 Install the 2 screws (c) to fix the cable clamps (d).
23 Install the screws (a) to fix the power terminal assembly (b).
For double fan units
24 Clean the heat sink surface and apply a thin layer of heat sink
compound to the heat sink surface.
25 Install the inverter PCB on its correct location.
26 Latch the PCB supports (c) using a small pair of pliers to fix the
PCB.
27 Install and tighten the 2 screws (d) to fix the inverter PCB to the
heat sink plate.
c b
c
a
c b b c b
a Connector
b Wire terminal
c PCB support
d Screw
28 Install the 4 screws (e) that fix the heat sink (f) to the switch
box.
e e
e f e
e Screw
f Heat sink
29 Connect all connectors (a) to the inverter PCB.
30 Connect the wire terminals (b) to the inverter PCB.
Is the problem solved?
Yes
No
To adjust the wiring of the inverter PCB
1 Adjust the wiring according to the wiring diagram and
connection diagram, see "6.2 Wiring diagram" on
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.
Service manual
106
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
c a
a c
a
c
d
d
b b b b c
e e
e f e
Action
No further actions required.
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
page 146.
Is the problem solved?
Yes
No
3.9

Main PCB

3.9.1

Checking procedures

INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a power check of the main PCB
1 Measure the voltage between the following wires on connector
X1A of the main PCB. All measurements MUST be 230 V AC
±10%.
▪ L3 (pin 1)–N (pin 5)
▪ L1 (pin 3)–N (pin 5)
a
a Connector X1A
Does the main PCB receive
power?
Yes
No
2 Check the power supply to the unit, see
procedures" on page 130.
Does the unit receive power?
Yes
No
To check the power supply to the optional PCB
Measure the voltage on connector X37A of the main PCB. The
measurement MUST be 16 V DC.
a Connector X37A
Action
No further actions required.
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
Action
Return to "3.9.1 Checking
procedures" on page 106 of the
main PCB and continue with the
next procedure.
Continue with the next step.
"4.1.1 Checking
Action
Correct the wiring from the main
power supply terminal to the
main PCB, see "3.9.2 Repair
procedures" on page 108.
Adjust the power supply to the
unit, see "4.1.2 Repair
procedures" on page 133.
a
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07