Haier 1U71S2SG1FA Service Manual

Also see for 1U71S2SG1FA: Installation manual Service manual Installation manual

Contents

188Disconnect charging hose from gas stop valve's service port, then fully open liquid and gas stop valves. (Do notattempt to turn valve rod beyond its stop.)Tighten valve caps and service port caps for the liquid and gas stop valves with a torque wrench at the specifiedtorques. See "3 Refrigerant piping" on page 23 for details.5. Refilling the RefrigerantCheck the type of refrigerant to be used on the machine nameplate.Precautions when adding R32.Fill from the liquid pipe in liquid form.(recommend)1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like "liquidfilling siphon attached" displayed on it.) (recommend)2) Be sure to use the R32 tools to ensure pressure and to prevent foreign objects entering.6. Charging with Refrigerant1) This system must use refrigerant R32.2) Add refrigerant 20g per meter when the total piping lengthexceeds the standard value, but make sure that the totalliquid piping length should be less than the max.value.7.Precautions for Laying Refrigerant Piping• Cautions on Pipe Handling1) Protect the open end of the pipe against dust and moisture.2) All pipe bends should be as gentle as possible. Use a pipe bender for bending. (Bending radius should be 30 to40mm or larger.)• Selection of Copper and Heat Insulation MaterialsWhen using commercial copper pipes and fittings, observe the following:1) Insulation material: Polyethylene foamHeat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mho C) Refrigerant gas pipe's surface temperaturereaches 110 o C max. Choose heat insulation materials that will withstand this temperature.2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.Outdoor Unit Standard Total liquid Piping lengrh Max. Total liquid Piping length3U55S2SR2FA 30m 50m3U70S2SR2FA 30m 60m4U75S2SR2FA 40m 70m4U85S2SR2FA 40m 70m5U105S2SS2FA 40m 80mGas Pipe Gas Pipe InsulationO.D.: 9.52mm,12.7mmThickness: 0.8mmI.D.: 12-15mm, 12.7mmThickness: 13mm min.Liquid Pipe Liquid Pipe InsulationO.D.: 6.35mmThickness: 0.8mmI.D.: 18-10mmThickness: 10mm min.Filling a cylinder with an attacged siphon Filling other cylinders.Turn the cylinder upside-downwhen filing.Stand the cylinder upright when filling.There is a siphon pipe inside, so thecylinder need not be upside-down tofill with liquid.