Panasonic S-07MM2U6 Installation Instructions Manual

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175-2. 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 ConnectionIndoor unit type 7 9 12 15 18Gas tubing inch ø1/2mm ø12.7Liquid tubing inch ø1/4mm ø6.35 Outdoor unitTorque wrenchSpannerIndoor unitFig. 5-6(2) To fasten the flare nuts, apply specified torque as at right:● When removing the flare nuts from the tubingconnections, or when tightening them after connectingthe tubing, be sure to use 2 adjustable wrenches orspanners. (Fig. 5-6)If the flare nuts are over-tightened, the flare may bedamaged, which could result in refrigerant leakage andcause injury or asphyxiation to room occupants.Tube diameter Tightening torqueapproximate Tube thicknessø1/4"(ø6.35 mm)lbf·inch 120 – 160 lbf·inch 1/32”N·m 14 – 18 N·m 0.8 mm{kgf·cm} {140 – 180 kgf·cm}ø1/2”(ø12.7 mm)lbf·inch 430 – 540 lbf·inch 1/32”N·m 49 – 61 N·m 0.8 mm{kgf·cm} {490 – 610 kgf·cm}● For the flare nuts at tubing connections, be sure to use the flare nuts that were supplied with the unit, or else flarenuts for R410A (type 2). The refrigerant tubing that is used must be of the correct wall thickness as shown in thetable at right.Because the pressure is approximately 1.6 times higher than conventional refrigerant pressure, the use of ordinary flarenuts (type 1) or thin-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 guidewhen 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).5-3. Insulating the Refrigerant TubingTubing Insulation● Thermal insulation must be applied to all units tubing,including distribution joint (field supply).* For gas tubing, the insulation material must be heatresistant to 248°F (120°C) or above. For other tubing,it must be heat resistant to 176°F (80°C) or above.Insulation material thickness must be 13/32” (10 mm)or greater.If the conditions inside the ceiling exceed DB 86°F(30°C) and RH 70%, increase the thickness of the gastubing insulation material by 1 step.Liquid tubing Gas tubingInsulationTwo tubes arranged togetherFig. 5-7