Pipe material
Phosphorus deoxidized copper seamless pipe (TP2M) for air conditioner .
Allowable pipe length and drop
These parameters differ according to the outdoor unit . See the instruction manual attached with the outdoor unit
for details .
Supplementary refrigerant
The refrigerant supplementation shall be as specified in the installation instructions attached with the outdoor unit .
The adding procedure shall be aided with a measuring meter for a specified amount of supplemented refrigerant .
Note:
Overfilling or underfilling of refrigerant will cause compressor fault . The amount of the added refrigerant shall be as
specified in the instructions .
Connection of refrigerant pipe
Conduct flared connection work to connect all refrigerant pipes .
The connection of indoor unit pipes must use double spanners .
The installing torque shall be as given in the following table .
Wall thicknessof connection pipe 0 .8mm
Connecting pipe O.D. (mm) Installing torque (N-m)
Double-spanner
opeation
Ø6.35 11.8 (1.2kgf-m)
Ø9.52 24.5 (2.5kgf-m)
Ø12.7
49.0 (5.0kgf-m)
Ø15.88
78.4 (8.0kgf-m)
Ø19.05
97.2 (9.9kgf-m)
Creating vacuum
With a vacuum pump, create vacuum from the stop valve of the outdoor unit . Emptying with refrigerant sealed in
the outdoor unit is absolutely forbidden .
Open all valves
Open all the valves on the outdoor unit .
Gas leakage detection
Check with a leakage detector or soap water if there is gas leakage at the pipe connections and bonnets .
lnsulation treatment
Conduct insulation treatment on both the gas side and liquid side of pipes respectively .
During cooling operation, both the liquid and gas sides are cold and thus shall be insulated so
as to avoid dew generation .
The insulating material at gas side shall be resistant to a temperature above 120 C
The indoor unit pipe connection part shall be insulated .
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