York R410A User Manual page 20

Installation Procedure
4. Refrigerant piping
(1) Piping diagram
(2) Piping size
YIFFYC025BAEFA
YIFFYC030BAEFA
YIFFYC036BAEFA
YIFFYC036BANFA
YIFFYC040BAEFB
YIFFYC040BANFA
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.
(3) 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.
Pipe dia
Liquid pipe 6.35mm
Liquid pipe 9.52mm
Gas pipe 12.7mm
Gas pipe 15.88mm
Gas pipe 19.05mm
Flare connection
Gas pipe
Indoor
unit
Liquid pipe
Liquid pipe 9.52x0.8mm
Gas pipe 15.88x1.0mm
Liquid pipe 9.52x0.8mm
Gas pipe 19.05x1.0mm
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
3-way stop valve
Outdoor
unit
3-way stop valve
90+0.5
Install the removed flare nuts
to the pipes to be connected,
then flare the pipes.
20
Outdoor Unit