Haier HPU-48HV03 Operation And Installation Manual page 26

Installation procedures
Piping connection
1.
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 sundries, such as sands enter the pipe.
Forced fastening without centering may
damage the threads and cause a gas leakage.
Pipe dia
Liquid pipe 9.52mm(3/8")
Gas pipe 19.05mm(3/4")
24
Fastening torque
29.4N . m
117.7N . m