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(2) Piping size
(3) Limitations for one way piping length and vertical height difference.
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.
Connecting method (indoor unit)
Apply refrigerant oil at half union as large and flare nut.
To bend a pipe, give the roundness as possible not to crush
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.
(4) Piping connection
Forced fastening without centering
may damage the threads and cause a
gas leakage.
Pipe diameter Fastening torque
Liquid pipe 6.35mm
Gas pipe 15.88mm
Liquid pipe 9.52mm
Gas pipe 19.05mm
14.2-17.2N
.
m
61.8-75.4N
.
m
32.7-39.9N
.
m
97.2-118.6N
.
m
Gas pipe 12.7mm
49.5-60.3N
.
m
Install the removed flare nuts to
the pipes to be connected, then
flare the pipes.
Model
One way piping length
Vertical height difference
(between indoor and outdoor)
less than 20 m
AU362AHERA AU36NAHERA
AU422AIERA AU42NAIERA
AU522AIERA AU52NAIERA
AU122AEERA
AU182AFERA
AU242AGERA AU282AHERA
Gas pipe
15.88x1.0mm
Liquid pipe
Gas pipe
9.52x0.8mm
19.05x1.0mm
Liquid pipe
9.52x0.8mm
Gas pipe
12.7x1.0mm
Liquid pipe
6.35x0.8mm
Refrigerant piping
17
Installation Procedure
90+0.5
AU422AIERA
AU42NAIERA
AU522AIERA
AU52NAIERA
AU242AGERA
AU282AHERA
AU362AHERA
AU36NAHERA
AU122AEERA
AU182AFERA
less than 30 m
less than 15 m
less than 15 m
less than 50 m less than 30 m