haier AU142AFBIA - Manual (Page 14)

13
INSTALLATION MANUAL FOR OUTDOOR UNIT
(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.
Install the removed flared nuts to the pipes to be connected,
then flare the pipes.
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.
90 + 0.5
(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
42N.m
60N.m
Liquid pipe 9.52mm(3/8")
Gas pipe 15.88mm(5/8")
Flare connection
Gas pipe
Indoor
unit
Outdoor
unit
3-way valve
3-way valve
Liquid
pipe
Flare connection
Gas pipe 15.88x1.0mm
9.52x0.8mm Liquid pipe