Haier HR18D2VAR Installating And Operation Manual

Also see for HR18D2VAR: Service manual

Contents

8Refrigerant Line SizingCheck the following table (Table 3) for correct suction and liquid line sizes for any combination ofthe unit size and the maximum refrigerant line length.Refrigerant Line Length (Ft)Unit Size 0 - 24 25 - 49 50 - 74(Ton) Line Outside Diameter (In)Suction Liquid Suction Liquid Suction Liquid1.5 3/4 3/8 3/4 3/8 7/8 1/22.0 3/4 3/8 3/4 3/8 7/8 1/22.5 3/4 3/8 3/4 3/8 7/8 1/2Table 3:Refrigerant Line SizingThe factory charge is sufficient for 25 feet of standard liquid line. For longer or shorter liquid linelengths, adjust the charge as follows:1/4" Line +/- 0.3 oz. Per foot5/16" Line +/- 0.4 oz. Per foot3/8" Line +/- 0.6 oz. Per foot1/2" Line +/- 1.2 oz. Per foot.Vertical Separation between Indoor and Outdoor UnitsMaximum allowable vertical separations between indoor and outdoor units are illustrated in Figure4-A and Figure 4-B. It's 70' when the indoor unit is below the outdoor unit (Figure 4-A), and 50' whenthe indoor unit is above the outdoor unit (Figure 4-B).To ensure good oil return to the compressor when the indoor unit is below the outdoor unit, suctionline oil trap should be used as illustrated in Figure 4-A.Tubing Connections! CAUTION - Use extreme caution in removing the caps from the suction and liquid line fittings, asthere is pressure present. A fitting is on the liquid line to remove pressure.! CAUTION - Heat Pumps are charged with refrigerant. Heat Pump liquid and suction valves areclosed to contain the charge within the unit. Do not force the valve stem against the retaining ring. Ifthe valve stem is backed out past the retaining ring, system pressure could force the valve stem outof the valve body and possibly cause personal injury.! CAUTION - The piston is in the accessory bag. Don't forget to take it out and put into the indoorliquid pipe orifice.Instructions on the field tubing connections and valve opening procedure are as follow:SEER131313133.0 7/8 3/8 1 1/8 3/8 1 1/8 1/2