Haier AD142AMBEA Operation And Instruction Manual - page 21
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Installation Manual For Indoor Unit
Vacuum pumping
Open all valves
Gas leakage detection
Insulation treatment
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.
Check with a leakage detector or soap water that if there is gas leakage at the pipe
connections and bonnets.
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.
The notch upward(Attached detail view)
Indoor unit
Subsidiary insulation tube
Field piping side