Repair Procedures - Daikin VRV IV+ Service Manual

3 Components
3.11.2

Repair procedures

To remove the oil return valve coil
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.
Prerequisite: If needed, remove any parts to create more space for
the removal of the oil return valve coil.
1 Remove the screw and remove the oil return valve coil from the
oil return valve body.
a
a Screw
b Valve coil
c Valve body
2 Cut all tie straps that fix the oil return valve coil harness.
3 Disconnect the oil return valve coil connector from the
appropriate PCB.
4 To install the oil return valve coil, see
procedures" on page 114.
To remove the oil return valve body
Prerequisite: Recuperate the refrigerant from the refrigerant circuit,
see "4.2.2 Repair procedures" on
1 Remove the oil return valve coil from the oil return valve body,
see "3.11.2 Repair procedures" on
2 Cut the oil return valve pipes using a pipe cutter.
b
a Oil return valve pipe
b Oil return valve body
3 Remove the oil return valve.
4 Keep the insulation for re-use.
5 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
6 Heat the end of the oil return valve pipes using an oxygen
acetylene torch and remove the oil return valve pipe ends.
7 Stop the nitrogen supply when the piping has cooled down.
8 To install the oil return valve body, see
procedures" on page 114.
Service manual
114
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
"3.13 Plate
b
c
"3.11.2 Repair
page 136.
page 114.
a
a
"3.11.2 Repair
To install the oil return valve body
1 Install the oil return valve in the correct location.
2 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
3 Wrap a wet rag around the oil return valve and solder the oil
return valve pipes to the oil return valve.
CAUTION
Overheating the valve will damage or destroy it.
4 After soldering is done, stop the nitrogen supply after the
component has cooled‑down.
b
a Oil return valve pipe
b Oil return valve body
5 Install the insulation in the original location.
6 Install the oil return valve coil on the oil return valve body, see
"3.11.2 Repair procedures" on
7 Add refrigerant to the refrigerant circuit, see
procedures" on page 136.
To install the oil return valve coil
1 Install the oil return valve coil on the oil return valve body.
a
a Screw
b Valve coil
c Valve body
2 Install and tighten the screw to fix the oil return valve coil.
3 Route the oil return valve coil harness towards the appropriate
PCB.
4 Connect the oil return valve coil connector to the 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.
5 Fix the oil return valve coil harness using new tie straps.
Is the problem solved?
Yes
a
a
page 114.
"4.2.2 Repair
b
c
Action
No further actions required.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07