Panasonic S-12MY2U6 Installation Instructions Manual

Also see for S-12MY2U6: Operating instructions Installation instructions Installation instructions Operating instructions

Contents

14Cautions During Brazing● Replace air inside the tube with nitrogen gas to prevent copper oxide film from forming during the brazing process.(Oxygen, carbon dioxide and Freon are not acceptable.)● Do not allow the tubing to get too hot during brazing. The nitrogen gas inside the tubing may overheat, causing refrigerantsystem valves to become damaged. Therefore allow the tubing to cool when brazing.● Use a reducing valve for the nitrogen cylinder.● Do not use agents intended to prevent the formation of oxide film.These agents adversely affect the refrigerant and refrigerant oil, and may cause damage or malfunctions.5-2. Connecting Tubing Between Indoor and Outdoor Units(1) Tightly connect the indoor-side refrigerant tubing extended from the wall with the outdoor-side tubing.Indoor Unit Tubing Connection ( 1, 2... n-1)Indoor unit type 12 18Gas tubing inch ø1/2mm ø12.7Liquid tubing inch ø1/4mm ø6.35(2) To fasten the flare nuts, apply specified torque.● When removing the flare nuts from the tubing connections, orwhen tightening them after connecting the tubing, be sure touse 2 adjustable wrenches or spanners. (Fig. 5-6)If the flare nuts are over-tightened, the flare may be damaged,which could result in refrigerant leakage and cause injury orasphyxiation to room occupants.Outdoor unitTorque wrenchSpannerIndoor unitFig. 5-6● For the flare nuts at tubing connections, be sure to use theflare nuts that were supplied with the unit, or else flare nuts forR410A (type 2). The refrigerant tubing that is used must be ofthe correct wall thickness as shown in the table at right.Tube diameter Tightening torque,approximateTubethicknessø1/4” (ø6.35 mm)Ibf·inch 120 – 160 lbf·inch 1/32”N·m 14 – 18 N·m 0.8 mm{kgf·cm} {140 – 180 kgf·cm}ø3/8” (ø9.52 mm)Ibf·inch 300 – 360 lbf·inch 1/32”N·m 34 – 42 N·m 0.8 mm{kgf·cm} {340 – 420 kgf·cm}ø1/2” (ø12.7 mm)Ibf·inch 430 – 540 lbf·inch 1/32”N·m 49 – 61 N·m 0.8 mm{kgf·cm} {490 – 610 kgf·cm}ø5/8” (ø15.88 mm)Ibf·inch 590 – 710 lbf·inch 5/128”N·m 68 – 82 N·m 1.0 mm{kgf·cm} {680 – 820 kgf·cm}ø3/4” (ø19.05 mm)Ibf·inch 885 – 1060 lbf·inch 5/128”N·m 100 – 120 N·m 1.0 mm{kgf·cm} {1000 – 1200 kgf·cm}Because the pressure is approximately 1.6 times higher than conventional refrigerant pressure, the use of ordinary flare nuts (type 1) orthin-walled tubes may result in tube rupture, injury, or asphyxiation caused by refrigerant leakage.● In order to prevent damage to the flare caused by over-tightening of the flare nuts, use the table above as a guide when tightening.● When tightening the flare nut on the liquid tube, use an adjustable wrench with a nominal handle length of 7 – 7/8 in. (200 mm).