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Installation Procedure
(2) Piping size
HBU-18CF03
HBU-18HF03
HDU-18CF03
HDU-18HF03
HDU-28CF03
HDU-28HF03
(3) Limitations for one way piping length and vertical height difference.
M o d e l
HBU-18CF03
HDU-18CF03
HBU-18HF03
HDU-18HF03
HDU-28HF03
HDU-28CF03
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 (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.
Forced fastening without centering
may damage the threads and cause a
gas leakage.
Liquid pipe
6.35x0.8mm
12.7x1.0mm
Gas pipe
Liquid pipe
9.52x0.8mm
15.88x1.0mm
Gas pipe
One way piping length
less than 15 m
less than 40 m
Pipe dia
Liquid pipe 6.35mm
Liquid pipe 9.52mm
Gas pipe 12.7mm
Gas pipe 15.88mm
Gas pipe 19.05mm
8
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Refrigerant piping
90+0.5
Install the removed flare nuts to
the pipes to be connected, then
flare the pipes.
Vertical height difference
(between indoor and outdoor)
less than 5 m
less than 15 m
Fastening torque
14.2-17.2N . m
32.7-39.9N . m
49.5-60.3N . m
61.8-75.4N . m
97.2-118.6N . m
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