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Double-spanner
operation
For series 182
For series 242
Pipe material and size
Pipe material
Phosphorus deoxidized copper seamless
pipe (TP
2M
) for air conditioner
Pipe size
(mm)
Gas side
12.70
Liquid side 6.35
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.
Requirement
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)
6.35
9.52
12.70
15.88
Installing torque
(N-m)
11.8 (1.2kgf-m)
24.5 (2.5 kgf-m)
49.0 (5.0 kgf-m)
78.4 (8.0 kgf-m)
Type
Pipe size
(mm)
Gas side 15.88
Liquid side 9.52
Vacuum pumping
Open all valves
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 the valves on the outdoor unit.
Gas leakage detection
Check with a leakage detector or soap water that if there is gas leakage at the pipe
connections and bonnets.
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Insulation 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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