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INSTALLATION MANUAL FOR OUTDOOR UNIT
(1) Outline piping
4. Refrigerant piping
(2) Piping size
(3) Limitations for one way piping length and vertical height
One way piping length: less than
15m.
90 + 0.5
Install the removed flared nuts to the pipes to be connected,
then flare the pipes.
Precautions for refrigerant piping
Gas piping
Liquid piping
12.7(1/2")x1.0mm
6.35(1/4")x0.8mm
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
Forced fastening without centering may
damage the threads and cause a gas
leakage.
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.
Pipe dia Fastening torque
11.8N
.
m
49.0N
.
m
Liquid pipe 6.35mm(1/4")
Gas pipe 12.7mm(1/2")
Flare connection
Gas pipe
Indoor
unit
Outdoor
unit
3-way valve
3-way valve
Liquid
pipe
Flare connection