Daikin VRV IV+ Service Manual page 91

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a b
a Tie strap
b Expansion valve cover
c Expansion valve motor
3 Pull the expansion valve motor to remove it from the expansion
valve body.
INFORMATION
It may be needed to turn the expansion valve motor 1/8
turn counter clockwise to unlock it.
4 Cut all tie straps that fix the expansion valve motor harness.
5 Disconnect the expansion valve motor connector from the
appropriate PCB. See "To perform an electrical check of the
expansion valve" on page 90
valve connectors and their locations.
6 To install the expansion valve motor, see
procedures" on page 90.
To remove the expansion valve body
Prerequisite: Recuperate the refrigerant from the refrigerant circuit,
see "4.2.2 Repair procedures" on
Prerequisite: If needed, remove any parts or insulation to create
more space for the removal.
1 Remove the expansion valve motor, see
procedures" on page 90.
2 Cut the expansion valve pipes using a pipe cutter.
a
c
b
a Expansion valve body
b Expansion valve pipe
c Pipe cutter
INFORMATION
The expansion valve and motor can have a different
configuration / layout.
3 Remove the expansion valve body.
4 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
5 Heat the ends of the expansion valve pipes using an oxygen
acetylene torch and remove the expansion valve pipe ends.
6 Stop the nitrogen supply when the piping has cooled down.
7 To install the expansion valve body, see
procedures" on page 90.
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VRV IV+ Heat Pump
ESIE18-14 – 2019.07
c
for an overview oft he expansion
"3.5.2 Repair
page 136.
"3.5.2 Repair
"3.5.2 Repair
To install the expansion valve body
1 Install the expansion valve body in the correct location and
correctly oriented.
2 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
3 Wrap a wet rag around the expansion valve body and solder
the refrigerant pipes to the expansion valve body.
CAUTION
Overheating the valve will damage or destroy it.
4 After soldering is done, stop the nitrogen supply after the
component has cooled‑down.
a
b
a Expansion valve body
b Expansion valve pipe
5 To install the expansion valve motor, see
procedures" on page 90.
6 Add refrigerant to the refrigerant circuit, see
procedures" on page 136.
To install the expansion valve motor
1 Install the expansion valve motor on the expansion valve body.
INFORMATION
Turn the expansion valve motor 1/8 turn clockwise to lock it
on the expansion valve body.
a
b
a Expansion valve motor
b Pipe
2 Route the expansion valve motor harness towards the
appropriate PCB.
3 Connect the expansion valve motor connector to the
appropriate PCB.
WARNING
When reconnecting a connector to the PCB, do NOT apply
force, as this may damage the connector or connector pins
of the PCB.
4 Fix the expansion valve motor harness using new tie straps.
Is the problem solved?
Yes
No
3 Components
"3.5.2 Repair
"4.2.2 Repair
Action
No further actions required.
Return to "3.5.1 Checking
procedures" on page 89 of the
expansion valve and continue
with the next procedure.
Service manual
91