Daikin VRV IV+, Service Manual

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3 | Components
Service manual
305
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
To remove the oil return valve body
Prerequisite: Recuperate the refrigerant from the refrigerant circuit, see
"4.2.2 Repair procedures" [ 4 368].
1 Remove the oil return valve coil from the oil return valve body, see
"3.13.2 Repair procedures" [
4
304].
2 Cut the oil return valve pipes using a pipe cutter.
a
b
a
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 "3.13.2 Repair procedures" [
4
304].
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.