Sanyo 26KHS72R Installation Instructions - Page 99
Precautions for Packed Valve Operation
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07-115 SSHP_II 5/7/07 4:00 PM Page 99 G Do not use a spanner to tighten the valve stem caps. Doing so may damage the valves. G Depending on the installation conditions, applying excessive torque may cause the nuts to crack. Packed valve Charging port Valve stem Precautions for Packed Valve Operation G If the packed valve is left for a long time with the valve stem cap removed, refrigerant will leak from the valve. Therefore, do not leave the valve stem cap removed. G Use a torque wrench to securely tighten the valve stem cap. G Valve stem cap tightening torque: Charging port ø3/8" (Liquid side) ø5/8" (Gas side) 8 - 10 N • m (80 - 100 kgf • cm) 19 - 21 N • m (190 - 210 kgf • cm) 28 - 32 N • m (280 - 320 kgf • cm) Main valve Valve stem cap Fig. 9-8 2 tubes arranged together Inter-unit control wiring Gas tube Liquid tube 9-3. Insulating the Refrigerant Tubing Tubing Insulation G Thermal insulation must be applied to all unit tubing, including the distribution joint (purchased separately). * For gas tubing, the insulation material must be heat resistant to 248°F or above. For other tubing, it must be heat resistant to 176°F or above. Insulation material thickness must be 13/32 in. or greater. If the conditions inside the ceiling exceed DB 86°F and RH 70%, increase the thickness of the gas tubing insulation material by 1 step. CAUTION If the exterior of the outdoor unit valves has been finished with a square duct covering, make sure you allow sufficient space to access the valves and to allow the panels to be attached and removed. Taping the flare nuts Wind the white insulation tape around the flare nuts at the gas tube connections. Then cover up the tubing connections with the flare insulator, and fill the gap at the union with the supplied black insulation tape. Finally, fasten the insulator at both ends with the supplied vinyl clamps. (Fig. 9-10) Insulation material The material used for insulation must have good insulation characteristics, be easy to use, be age resistant, and must not easily absorb moisture. CAUTION After a tube has been insulated, never try to bend it into a narrow curve because it can cause the tube to break or crack. Insulation Fig. 9-9 Armoring tape Sealer (supplied) Insulation tape (white) (supplied) Flare insulator (supplied) Unit side insulator Flare nut Tube insulator (not supplied) Heat resistant 248ºF or above Vinyl clamps (supplied) Fig. 9-10 Drain insulator and clamp. Large (supplied) Refrigerant tubing and insulator (not supplied) Drain pipe and insulator (not supplied) Packing clamp. Small hose band (supplied) Seal Insulation tape Vinyl Flare clamp insulator The procedure used for installing the insulator for both gas and liquid tubes is the same. Fig. 9-11 Never grasp the drain or refrigerant connecting outlets when moving the unit. 99