Repair Procedures - Daikin VRV IV+ Service Manual

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Are the test results OK?
No
Problem solved?
After all checking procedures listed above have been performed:
Is the problem solved?
Yes
No
3.8.2

Repair procedures

To remove the 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 Access the switch box, see
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
For single fan units
2 Loosen and remove the screws (a) that fix the power terminal
assembly (b).
3 Loosen and remove the 2 screws (c) that fix the cable clamps
(d).
4 Unplug the fan connectors X1A and X2A (e).
5 Unplug the wiring (f) from the main board.
6 Detach the tie wrap (g).
f
e
c
d
a
b
a
c
d
a Screw
b Power terminal assembly
c Screw
d Cable clamp
e Connectors X1A and X2A
f Wiring
g Tie wrap
7 Loosen and remove the screw (a) that fixes the cable clamp (b).
8 Detach the tie wrap (c).
9 Cut the tie wraps (d) on the cable harness.
10 Separate the cables (e) and (f).
11 Loosen and remove the 2 screws (g) that fix the compressor
inverter assembly (h).
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
Action
Replace the inverter PCB, see
"3.8.2 Repair procedures" on
page 103.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
"3.13 Plate
"3.13 Plate work" on page 118.
g
12 Loosen and remove the screw (i) that fixes the thermistor clamp
(j).
13 Loosen and remove the 2 screws (k) that fix the heat pipe (l).
14 Loosen and remove the screw (n) that fixes the ground wire
(m).
b
a
a Screw
b Cable clamp
c Tie wrap
d Tie wrap
e Cables
f Cables
g Screw
h Compressor inverter assembly
i Screw
j Thermistor clamp
k Screw
l Heat pipe
m Ground wire
n Screw
15 Using a flat screwdriver (a), separate the heat pipe (b) from the
heat sink (c).
16 Loosen and remove the screw (d) that fixes the power terminal
assembly (e).
17 Move the power terminal assembly (e) to the right.
18 Disconnect connectors X3 (f) and X5 (g) from the fan inverter
PCB (h).
d
e
b
c
a
a Flat screwdriver
b Heat pipe
c Heat sink
d Screw
e Power terminal assembly
f Connector X3
g Connector X5
h Fan inverter PCB
19 Turn the power terminal assembly (a) to the left.
20 Remove the 4 screws (b) that fix the heat sink (c).
WARNING
Thermal grease is applied to the heat sinks. Use gloves
when separating the heat sinks from the inverter boards.
3 Components
d
e
f
c
l
k
k
h
i
n m g g j
g h f
e
Service manual
103