Haier HDU-18CF03 Operating & Installation Manual page 32

Haier duct type air conditioner operation & installation manual indoor unit
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Installation Manual For Indoor Unit
Vacuum pumping
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 that 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.
Indoor unit
The notch upward(Attached detail view)
Field piping side
Subsidiary insulation tube
31

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Hdu-18hf03Hdu-28cf03Hdu-28hf03