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INSTALLATION MANUAL FOR OUTDOOR UNIT
4. Refrigerant piping
(1) Outline piping
(2) Piping size
Liquid pipe
Gas pipe
Install the removed flared nuts to the pipes to be connected,
then flare the pipes.
(3) Limitations for one way piping length and vertical height difference.
One way piping length: less than 15m.
Vertical height difference: Less than 5m.
Precautions for refrigerant piping
Do not twist or crush piping.
Be sure that no dust is mixed in piping.
Bend piping with as wide angle as possible.
Keep insulating both gas and liquid piping.
Check flare-connected area for gas leakage.
(4) Piping connection
Connecting method
Apply refrigerant oil at half union and flare nut.
To bend a pipe, give the roundness as large as possible not to crash the pipe.
When connecting pipe, hold the pipe centre to centre then screw nut on by hand, refer to Fig.
Be careful not to let foreign matters, such as sands enter the pipe.
Forced fastening without centering may
damage the threads and cause a gas leakage.
Flare connection
Indoor
unit
9.52x0.8mm
15.88x1.0mm
13
3-way valve
Liquid
pipe
Gas pipe
Flare connection
Pipe dia
Liquid pipe 9.52mm(3/8")
Gas pipe 15.88mm(5/8")
Outdoor
unit
3-way valve
Fastening torque
42N . m
60N . m
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