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U) <br /> c <br /> 6. Refilling refrigerant w <br /> Check the type of refrigerant to be used on the machine nameplate. <br /> Precautions when adding R410A <br /> Fill from the liquid pipe in liquid form. <br /> R410A is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal <br /> operation. <br /> 1) Before filling, check whether the cylinder has a siphon attached or not.(It should have something like"liquid filling siphon <br /> attached"displayed on it.) <br /> Filling a cylinder with an attached siphon Filling other cylinders <br /> Stand the cylinder upright when filling. Turn the cylinder <br /> There is a siphon pipe inside, so the cylinder, upside-down when filling. <br /> need not be upside-down to fill with liquid. J <br /> • Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering. <br /> 7. Refrigerant piping work <br /> 7-1.Cautions on pipe handling ;; A i /_ _Be sure to wall <br /> • Protect the open end of the pipe from dust and moisture. ,�, place a cap.\I_', <br /> • All pipe bends should be as gentle as possible.Use a pipe bender for Rain 1!,;` If no flare cap is <br /> bending. ____available,cover .a <br /> the flare mouth — <br /> " with tape to keep <br /> 7-2. Selection of copper and heat insulation materials dirt and water out. <br /> When using commercial copper pipes and fittings,observe the following: <br /> • Insulation material: Polyethylene foam <br /> Heat transfer rate:0.041 to 0.052W/mK(0.024 to 0.030Btu/fth°F(0.035 <br /> to 0.045kca1/mh°C)) <br /> Be sure to use insulation that is designed for use with HVAC Systems. <br /> • ACR Copper only. <br /> • Be sure to insulate both the gas and liquid piping and observe the <br /> insulation dimensions as below. <br /> Piping size Minimum bend radius Piping thickness Thermal insulation size Thermal insulation <br /> thickness <br /> O.D.3/8 inch 1-3/16 inch(30mm) I.D.15/32-19/32 inch <br /> (9.5mm) or more 0.031 inch(0.8mm) (12-15mm) <br /> Gas side O.D.1/2 inch 1-9/16 inch(40mm) (C1220T-0) I.D.9/16-5/8 inch <br /> (12.7mm) or more (14-16mm) 13/32 inch <br /> O.D.5/8 inch 1-15/16 inch(50mm) 0.039 inch(1.0mm) I.D.5/8-13/16 inch (10mm)Min. <br /> (15.9mm) or more (C1220T-0) (16-20mm) <br /> Liquid side O.D.1/4 inch 1-3/16 inch(30mm) 0.031 inch(0.8mm) I.D.5/16-13/32 inch <br /> (6.4mm) or more (C1220T-O) (8-10mm) <br /> • Use separate thermal insulation pipes for gas and liquid refrigerant pipes. <br /> Inter-unit wire <br /> Gas pipe <br /> Liquid pipe <br /> ..O...."0) <br /> Gas pipe O Liquid pipe <br /> insulation / \ insulation <br /> Finishing tape Drain hose <br /> English 8 <br />