YMGI: Your Modern Green Idea
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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1. To prevent damaging the pipe avoid sharp bends. Pipe bends should have a radius of 6 inches (150 mm)
or more.
2. Bending the pipe repeatedly in the same area may cause it to split or break.
Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
1. Be sure to connect the pipe against the port on the indoor unit correctly. If the pipe is not centered, the flare
nut will not tighten smoothly. If the flare nut is forced to turn, the threads will be damaged.
2. Do not remove the flare nut until the pipe is connected, to prevent debris from getting into the piping
system.
When connecting or removing it the refrigerant pipes to the unit, it is recommended that both a wrench and torque
wrench are used.
When connecting, cover both the inside and outside of the flare nut with refrigeration oil. Tighten by hand, and
then finish tightening it with a wrench.
Refer to table below to check if the wrench has been tightened properly over tightening can damage the nut and
cause leakage).
Flare nut tightening torque
Pipe Diameter
Tightening Torque
1/4˝(Inch)
15-30 (N·m)
3/8˝(Inch)
35-40 (N·m)
5/8˝(Inch)
60-65 (N·m)
1/2˝(Inch)
45-50 (N·m)
3/4˝(Inch)
70-75 (N·m)
7/8˝(Inch)
80-85 (N·m)
Examine the connection pipe for leaks, then perform the treatment of heat insulation, as shown in the illustration.