Haier AU42NALEAA Service Manual - Page 94

Pipe material and size >a__WcU[S^ a`V[e[a`Wc Type For series 182 Pipe material Phosphorus deoxidized copper seamless pipe (TP2M) for air conditioner Pipe size Gas side (mm) Liquid side 12.70 6.35 For series 242 Pipe size Gas side (mm) Liquid side 15.88 9.52 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) Double-spanner operation 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. -94-