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9 English• When connecting the pipings downward, remove the knock-out by making 4 holes in the middle on the each side of theknockout with a drill.(Refer to figure 22)1. Dril2. Center area around knockout hole3. Knockout hole4. Slit• After knocking out the knock-out, it is recommended to applyrepair paint to the edge and the surrounding end surfaces to pre-vent rusting.(Refer to figure 23)1. Bottom frame2. Inter-unit pipingNoteCutting out the 2 slits makes it possible to install as shown in fig-ure 23. (Use a metal saw to cut out the slits.)• Please refer to the Table 1 for the dimensions for processingflares.• When connecting the flare nut, coat the inner surface of the flarewith refrigeration oil and initially tighten by hand 3 or 4 turnsbefore tightening firmly.• Please refer to the Table 1 for the tightening torque. (Too muchtightening will end up in splitting of the flare.)Table 1• If a torque wrench is not available, there is a place where the tight-ening torque will suddenly increase if a normal wrench is used totighten the flare nut.From that position, further tighten the flare nut the angle shownbelow.• After all the piping has been connected, use nitrogen to perform agas leak check.(Refer to figure 24-[1])1. Front connection2. Gas side accessory pipe (1)3. Gas side accessory pipe (3)4. Gas side piping (field supply)5. Cut at an appropriate length.6. Gas side accessory pipe (2)(Refer to figure 24-[2])1. Rear-side connection2. Gas side accessory pipe (1)3. Gas side accessory pipe (2)4. Gas side accessory pipe (3)5. Gas side piping (field supply)(Refer to figure 24-[3])1. Side connection2. Gas side accessory pipe (2)3. Cut at an appropriate length.4. Gas side piping (field supply)5. Gas side accessory pipe (3)6. Gas side accessory pipe (1)(Refer to figure 24-[4])1. Bottom connection2. Cut at an appropriate length.3. Gas side piping (field supply)4. Gas side accessory pipe (3)5. Gas side accessory pipe (1)Precautions for connecting pipes• Be careful not to let the inter-unit piping come into contact with thecompressor terminal cover.Adjust the height of the insulation material on liquid pipe when ithas the possibility of getting in contact with the terminal. Alsomake sure that the inter-unit piping does not touch the mountingbolt of the compressor.(Refer to figure 26)1. Terminal cover2. Compressor3. Corking, etc.4. Insulation material5. Bolts6. Inter-unit piping• If installing the outdoor unit higher than the indoor unit, caulk thespace around insulation and tubes because condensation on thecheck valve can seep through to the indoor unit side.[Preventing foreign objects from entering]• Plug the pipe through-holes with putty or insulating material (procured locally) to stop up all gaps, as shown in figure 25.(Insects or small animals entering the outdoor unit may cause ashort in the control box.)(Refer to figure 25)1. Putty or insulating material2. (field supply)7-6 Heat insulation of piping• If you think the humidity inside the ceiling might exceed 86°F(30°C) and RH80%, reinforce the insulation on the cooling piping.(At least 0.78 inch (20 mm) thick) (Condensation may form on thesurface of the insulation.)• Be sure to insulate the inter-unit piping (liquid and gas-side) andthe refrigerant branch kit. (Not insulating them may cause leak-ing.)(The highest temperature that the gas-side piping can reach isaround 248°F (120°C), so be sure to use insulating material which isvery resistant.)CAUTIONFor local insulation, be sure to insulate all the way to the pipe con-nections inside the machine.Exposed piping may cause leaking or burns on contact.Pipe size TighteningtorqueA dimen-sions forprocessingflaresFlare shapeφ 3/8 inch(φ 9.5mm)24.1-29.4 ft·lbf(32.7-39.9N·m)0.504-0.520 inch(12.8-13.2mm)φ 5/8 inch(φ 15.9mm)45.6-55.6 ft·lbf(61.8-75.4N·m)0.760-0.776 inch(19.3-19.7mm)φ 3/4 inch(φ 19.1mm)71.7-87.5 ft·lbf(97.2-118.6N·m)0.929-0.944 inch(23.6-24.0mm)Pipe size Further tightening angle Recommended arm lengthof toolφ 3/8 inch(φ 9.5mm) 60°- 90 ° Approx. 7-7/8 inch(200 mm)φ 5/8 inch(φ15.9mm) 30°- 60° Approx. 11-13/16 inch(300 mm)φ 3/4 inch(φ 19.1mm) 20° - 35° Approx. 17-11/16 inch(450 mm) A45˚± 2˚90˚± 2˚ R0.016-0.031 inch(R0.4-0.8mm)Refrigeration oil
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