Fujitsu AIRSTAGE J-II Design & Technical Manual

Also see for Airstage J-II: Service manual

PIPING DESIGN2.IMPORTANT ITEMS WHEN USING REFRIGERANT R410A2-1. R410A operates at higher pressure and has less solubility with mineral oil thantraditional R22 refrigerant. Therefore, the lubricant and a part of pipe material are different.Some special tools are necessary.REFRIGERANT PIPING MATERIAL AND WALL THICKNESS It is necessary to use seamless copper tubes for refrigerant use.Thickness of tubes are shown in table below.Endurance pressure of the pipe must be 4.2 MPa.Nominal Diameter (in) 1/4" 3/8" 1/2" 5/8" 3/4"Outside Diameter (mm) 6.35 9.52 12.70 15.88 19.05Material JIS H3300 C1220T-O or equivalent *1Wall Thickness *2 (mm) 0.8 0.8 0.8 1.0 1.2*1: Allowable tensile stress ≥ 33 (N/mm2)*2: Endurance pressure of the pipe must be 4.2 MPa.Please select the pipe size in accordance with regional standard.LUBRICANTRefrigerant R410A (Mixed refrigerant)Lubricant Synthetic oilTOOLS R410A work requires a number of special tools. Since the tools (with *3 symbol) for R22 workcannot be used for R410A, prepare them beforehand.Tool name Process and applicationPipe cutter Pipe cuttingRefrigerant piping workFlaring tool *3 Pipe flaring workTorque wrench *3 Flare nut connectionExpander Expansion at pipe connectionPipe bender Pipe bending workNitrogen gas Pipe interior oxidation prevention Air tightness testWelder Pipe brazingGauge manifold *3 Vacuum evacuation and refrigerantcharging Operation checkAir tightness test ~Refrigerant additional chargingCharging hose *3Vacuum pump (with adaptor) *3 Vacuum dryingElectronic scale for refrigerant charging Refrigerant additional chargingGas leak tester *3 Gas leakage test*3: Please refer to a service manual for details.- (06 - 13) -SYSTEMDESIGNSYSTEMDESIGN