To Access The Switch Box On Double Fan Units; To Remove The Plate Work On Single Fan Units - Daikin VRV IV+ Service Manual

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c
b
a
a Main PCB
b Noise filter PCB
c Reactor
6 Completely tilt the main PCB assembly to get full access to the
noise filter PCB and the reactor.
7 To install the switch box, see
3.13.2 To access the switch box on double fan
units
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see
page 118.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
e a a
b a d c e a b
a Screw
b Screw
c Short screw
d Screw
e Screw
f Inverter mounting plate
2 Do NOT loosen the screws (a) that fix the inverter PCB's at this
step. These screws need only be removed when replacing an
inverter PCB.
3 Loosen and remove the 4 screws (b) that fix the heat sinks.
4 Loosen and remove the short screw (c) that fixes the grounding
wire to the heat sinks.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
"3.13 Plate work" on page 118.
"3.13 Plate work" on
a a e
f
1
2
b a e a b e e
5 Loosen and remove the screw (d) that fixes the Thermistor R1T
mounting bracket.
6 Using a screwdriver, carefully separate both heat sinks from the
inverter PCB's.
WARNING
Thermal grease is applied to the heat sinks. Use gloves
when separating the heat sinks from the inverter boards.
7 Loosen and remove the 6 screws (e) that fix the inverter
mounting plate.
a Inverter mounting plate
b Liquid cooling piping
8 Carefully pull the inverter mounting plate (a) to the front and tilt
it. Pay attention to the liquid cooling piping (b).
9 Disconnect the necessary wiring to have access to noise filter
PCB's, the reactors and - on the rear side of the inverter
mounting plate - the inverter PCB's and fan inverter PCB's.
10 To install the switch box, see
3.13.3 To remove the plate work on single fan
units
1 Stop the unit operation (via the user interface, operation switch,
...).
2 Turn OFF the respective circuit breaker.
To remove the service plate
a a
b
a Screw
b Service plate
3 Loosen and remove the 2 screws (a) that fix the service plate
assembly.
4 Remove the service plate assembly (b) from the unit.
3 Components
b a
"3.13 Plate work" on page 118.
Service manual
119