Haier HR18D2VAR Installating And Operation Manual

Also see for HR18D2VAR: Service manual

Contents

OUTDOOR UNITLIQUID LINEPITCH SUCTION LINE TOWARD OUTDOORUNIT 1/2" FRO EVERY 10' OF LINEINDOOR UNIT ABOVE ORLEVEL TO OUTDOOR UNITINDOOR UNITOUTDOOR UNITADDITIONAL SUCTION LINEOIL TRAP FOR EACH 20 FOOTRISE OF PIPEINDOOR UNITLIQUID LINESUCTION LINE OILTRAP WHEN INDOORUNIT IS 4 FEET ORM O R E B E L O WOUTDOOR UNITINDOOR UNIT BELOW OUTDOOR UNIT70'MAX.Figure 47Only refrigeration-grade copper piping (dehydrated and sealed) should be used. Take extreme care to keepthe refrigerant tubing clean and dry prior to and during installation. If in doubt, blow out the tubingwith dry nitrogen to remove any chips or debris before connection. Always keep tubing sealed until it isin place and the connections are to be made.Refrigerant piping should be as short as possible, with a minimum of elbows or bends, to avoid capacityloss and increased operating costs.Refrigerant lines must be adequately supported. If metal strapping is used to secure the tubing, do not allowthe strapping to directly contact the tubing. Use a closed cell insulation to separate the strapping from thetubing.Do not kink or twist the tubing.Refrigerant piping should not be installed in a cement slab, as this limits access to the refrigerant should aleak be suspected.To ensure good oil return to the compressor, it is important to pitch the horizontal suction line towardthe compressor, approximately 1/2" for every 10' of line.Line InsulationSuction line requires insulation in order to prevent condensation from forming on the piping and toprevent heat gain caused by surrounding air. Generally 3/8" wall thickness of Armflex or equivalentis satisfactory. In severe application (hot, high humidity areas) greater thickness may be required. Applythe line insulation by sliding it on the sealed tuing before cutting and making connections.Liquid line does not necessarily need insulation, however, if they are exposed to high ambient temperatures(i.e. kitchen, boiler rooms, hot attics & rooftop surface), then, they should be insulated. Make sure touse the proper size tubing for the liquid line to prevent liquid refrigerant flashing to a vapor withinthe liquid line.Do not allow the vapor line and liquid line to touch together. This would cause an undesirable heattransfer resulting in capacity loss and increased power consumption.INVERTED LOOPLIQUID LINEOUTDOOR UNITSUCTION LINEINDOOR UNIT50'MAX.6'B-1B-2A