Haier HDU-18HF03 User Manual download pdf (Page 32)

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

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Haier HDU-18HF03 User Manual Page 32