Daikin R410A Installation Manual

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Daikin R410A Installation Manual Manual pdf 9 page image

8 ■EnglishRefrigerant Piping WorkCAUTIONBe sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping may cause condensa-tion or burns if touched.Cautions on Pipe Handling• Protect the open end of the pipe against dust and moisture.(Tighten both edges with clamp.)• All pipe bends should be as gentle as possible. Use a pipe bender for bending.(See the minimum bend radius in the table below.)WallIf no flare cap isavailable, coverthe flare mouthwith tape to keepdirt or water out.Be sure toplace a cap.RainSelection of Copper and Heat Insulation materialsWhen using commercial copper pipes and fittings, observe the following:• Insulation material: Polyethylene foamHeat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to 0.045kcal/mh°C))Be sure to use insulation that is designed for use with HVAC Systems.• Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.Gas side Liquid side Gas pipe thermal insulationLiquid pipethermalinsulationO.D. 3/8 inch(9.5mm)O.D. 1/2 inch(12.7mm)O.D. 5/8 inch(15.9mm)O.D. 1/4 inch(6.4mm)I.D. 15/32-19/32inch (12-15mm)I.D. 9/16-5/8inch (14-16mm)I.D. 5/8-25/32inch (16-20mm)I.D. 5/16-13/32inch (8-10mm)Minimum bend radius Thickness 13/32 inch (10mm) Min.1-3/16 inch(30mm) or more1-9/16 inch(40mm) or more1-15/16 inch(50mm) or more1-3/16 inch(30mm) or moreThickness 0.031 inch (0.8mm)(C1220T-O)Thickness 0.039inch (1.0mm)(C1220T-O)Thickness 0.031inch (0.8mm)(C1220T-O)Also, when subject to high humidity, heat insulation of the refrigerant piping (the unit piping andbranch piping) must be further reinforced.Reinforce the insulation when installing the unit near bathrooms, kitchens, and other similar locations.Refer to the following:• 86°F (30°C), more than 75% RH: 13/16 inch (20mm) Min. in thicknessIf the insulation is not sufficient, condensation may form on the surface of the insulation.• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.Gas pipe Liquid pipeGas pipeinsulation Liquid pipeinsulationFinishing tape Drain hoseDrain Piping WorkCAUTIONMake sure all water is out before making the duct connection.■ Install the drain piping.• Make sure the drain works properly.• The diameter of the drain pipe should be greater than or equal to the diameter ofthe connecting pipe (vinyl tube; pipe size: 25/32 inch (20mm); outer dimension:1-1/32 inch (26mm)).Drain pipe connection holeRefrigerant pipesConnect the drain pipe afterremoving the rubber cap andinsulation tubing attached tothe connection hole.• Keep the drain pipe short and sloping downwards at a gradient of at least 1/100to prevent air pockets from forming.OKWrong