INSTALLATION MANUAL FOR OUTDOOR UNIT
23
(1) Outline piping
4. Refrigerant piping
(2) Piping size
(3) Limitations for one way piping length and vertical height difference.
One way piping length: less than 15m.
Vertical height difference: Less than 5m.
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
15.88(5/8") x 1.0mm
6.35(1/4") x 0.8mm
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.
Flare connection
Gas pipe
Indoor
unit
Outdoor
unit
2-way valve
3-way valve
Liquid
pipe
Flare connection
Pipe dia
Fastening torque
18N.m
60N.m
Liquid pipe 6.35mm(1/4")
Gas pipe 15.88mm(5/8")
(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.
