High Pressure Switch; Checking Procedures - Daikin VRV IV+ Service Manual

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Is the problem solved?
Yes
No
Repair procedures
To remove 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 Access the switch box, see
d
a a
a
a Connector
b Screw
c Connector X1A
d Connector X4A
2 Disconnect all other connectors from the fan inverter PCB.
INFORMATION
Bridge connector X4A is not supplied with the spare part
PCB. Transfer the bridge connector X4A
3 Loosen and remove the 2 screws that fix the fan inverter PCB
to the heat sink plate.
4 Carefully pull the PCB at the side and unlatch the PCB supports
one by one using a small pair of pliers.
5 To install the new fan inverter PCB, see
page 97.
To install the fan inverter PCB
1 Clean the heat sink surface and apply a thin layer of heat sink
compound to the heat sink surface.
2 Install the fan inverter PCB on its correct location.
3 Latch the PCB supports using a small pair of pliers to fix the
PCB.
4 Install and tighten the 2 screws to fix the fan inverter PCB to the
heat sink plate.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
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.
b
b c
"Repair procedures" on
d
a a
a
a Connector
b Screw
c Connector X1A
d Connector X4A
5 Connect all connectors to the fan inverter PCB.
6 Reinstall connector X4A which you recuperated from the
removed PCB.
Is the problem solved?
Yes
No
To adjust the wiring of the fan 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.
Is the problem solved?
Yes
No
3.7

High pressure switch

3.7.1

Checking procedures

To perform an electrical check of the high
pressure switch (general procedure)
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 Start the unit operation (via the user interface, operation switch,
central controller, ...).
3 Disconnect the high pressure switch connector from the PCB.
4 Connect a pressure gauge to the refrigerant circuit high
pressure service port and read the refrigerant pressure.
INFORMATION
When the unit is operating in heating mode, the high
pressure port is the gas service port. When the unit is
operating in cooling (defrost) mode, the high pressure port
is the liquid service port.
3 Components
b
b c
Action
No further actions required.
Return to "Checking
procedures" on page 95 of the
fan inverter PCB and continue
with the next procedure.
page 146.
Action
No further actions required.
Return to "Checking
procedures" on page 95 of the
fan inverter PCB and continue
with the next procedure.
"3.13 Plate
Service manual
97