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English■
10
2. Refrigerant piping
CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a
torque wrench.
2-1. Caution on piping handling
• Protect the open end of the pipe against dust and moisture.
• All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
2-2. Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:
• Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to
0.045kcal/mh°C))
Be sure to use insulation that is designed for use with HVAC Systems.
• ACR Copper only.
• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Piping size Flare nut tightening torque
Gas side
O.D. 3/8 inch (9.5mm) 24-1/8–29-1/2ft • Ibf (32.7-39.9N • m)
O.D. 1/2 inch (12.7mm) 36-1/2–44-1/2ft • lbf (49.5-60.3N • m)
Liquid side O.D. 1/4 inch (6.4mm) 10-1/2–12-3/4ft • lbf (14.2-17.2N • m)
Piping size Minimum bend radius Piping thickness Thermal insulation size
Thermal insulation
thickness
Gas side
O.D. 3/8 inch
(9.5mm)
1-3/16 inch (30mm)
or more
0.031 inch (0.8mm)
(C1220T-O)
I.D. 15/32-19/32 inch
(12-15mm)
13/32 inch
(10mm) Min.
O.D. 1/2 inch
(12.7mm)
1-9/16 inch (40mm)
or more
I.D. 9/16-5/8 inch
(14-16mm)
Liquid side
O.D. 1/4 inch
(6.4mm)
1-3/16 inch (30mm)
or more
I.D. 5/16-13/32 inch
(8-10mm)
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration
oil only to the inner
surface of the flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Apply oil
Torque wrench
Piping union
Flare nut
Spanner
Tighten
Wall
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
and water out.
Rain
Be sure to
place a cap.
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape Drain hose
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