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Outdoor Unit Installation
4.
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.
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
T
orque wrench
Piping union
Flare nut
Spanner
Tighten
Tightening torque
Flare nut
Piping connection
3/8 inch (9.5mm)
24-1/8 –
29-1/2lbf • ft
(32.7-39.9N • m)
36-1/2–
44-1/2lbf • ft
(49.5-60.3N • m)
Gas side
1/2 inch (12.7mm)
45-5/8–
55-5/8lbf • ft
(61.8-75.4N • m)
5/8 inch (15.9mm)
10-1/2 –
12-3/4lbf • ft
(14.2-17.2N • m)
Liquid side
1/4 inch (6.4mm)
Width across flats
Valve cap
3/4 inch (19mm)
12-5/8 –
15-3/8lbf • ft
(17.0-20.9N • m)
16–
20-1/4lbf • ft
(21.6-27.4N • m)
8 –
10-7/8lbf • ft
(10.7-14.7N • m)
7/8 inch (22mm)
Service port cap
Cautions on pipe handling
•
Protect the open end of the pipe from dust and moisture.
•
All pipe bends should be as gentle as possible. Use a pipe bender for bending.
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt and water out.
Be sure to
place a cap.
Rain
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.
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Gas side
Piping size
O.D. 3/8 inch
(9.5mm)
O.D. 1/2 inch
(12.7mm)
O.D. 5/8 inch
(15.9mm)
O.D. 1/4 inch
(6.4mm)
1-3/16 inch (30mm)
or more
1-9/16 inch (40mm)
or more
1-15/16 inch (50mm)
or more
1-3/16 inch (30mm)
or more
0.031 inch (0.8mm)
(C1220T-O)
0.039 inch (1.0mm)
(C1220T-O)
0.031 inch (0.8mm)
(C1220T-O)
I.D. 15/32-19/32 inch
(12-15mm)
I.D. 9/16-5/8 inch
(14-16mm)
I.D. 5/8-13/16 inch
(16-20mm)
I.D. 5/16-13/32 inch
(8-10mm)
13/32 inch
(10mm) Min.
Minimum bend radius
Piping thickness
Thermal insulation size Thermal insulation
thickness
Liquid side
•
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
• Using finishing tape, bundle and wrap the indoor unit piping and drain hose together so that the drain hose is below
the other piping.
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