Haier 1U71S2SG1FA Service Manual page 55

Note:
Over filling or underilling of refrigerant will cause compressor fault. The amount of the added refrigerant shall be as
specified in the instructions.
Connecting
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 thick ness of connection pipe≥0.8mm
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.
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.
φ6.35
φ9.52
φ12.7
φ15.88
Installing Torque (N-m)
11.8 (1.2 kgf-m)
24.5 (2.5 kgf-m)
49.0 (5.0 kgf-m)
78.4 (8.0 kgf-m)
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