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1.
Flaring the pipe end.
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the unit life.
3) Never use piping which has been used for previous installations. Only use parts which are provided with the unit.
4) Do never install a refrigerant drier to this unit.
5) The drying material may dissolve and damage the system.
6) Incomplete or improper flaring may cause refrigerant gas leakage.
2.
Refrigerant piping.
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
3) Use torque wrenches 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 the torque wrenches.
[Apply oil]
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
2-1. Caution on piping handling
1) Protect the open end of the pipe against dust and moisture.
2) 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:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052 W/mK (0.024 to 0.030 Btu/fth˚F (0.035 to 0.045kcal/mh˚C))
Refrigerant gas pipe's surface temperature reaches 230˚F (110˚C) max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide
insulation dimensions as below.
15/18 class
O.D. 1/2 inch (12.7mm)
1-9/16 inch (40mm) or more 1-15/16 inch (50mm) or more 1-3/16 inch (30mm) or more
Thickness 0.031 inch
(0.8mm) (C1220T-O)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Refrigerant Piping Work
Apply refrigeration
oil to the inner
surface of the flare.
Spanner
Piping union
Gas side
24 class
O.D. 5/8 inch (15.9mm)
O.D. 1/4 inch (6.4mm)
Minimum bend radius
Thickness 0.039 inch
Thickness 0.031 inch
(1.0mm) (C1220T-O)
(0.8mm) (C1220T-O)
(Cut exactly at
right angles.)
Set exactly at the position shown below.
A
Die
[Tighten]
Torque wrench
1/2 inch
36.5- 44.5ft • Ibf
(49.5-60.3N • m)
Flare nut
Liquid side
Gas pipe thermal insulation
15/18/24 class
15/18 class
I.D. 0.551-0.630 inch
(14-16mm)
Flare's inner
surface must
be flaw-free.
Remove burrs
Flaring
Flare tool for R410A
Conventional flare tool
Clutch-type
Clutch-type (Rigid-type)
A
0-0.020 inch (0-0.5mm)
0.039-0.059 inch (1.0-1.5mm)
Flare nut tightening torque
Gas side
5/8 inch
45.6- 55.6ft • Ibf
(61.8-75.4N • m)
Be sure to
place a cap.
Rain
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt or
water out.
Gas pipe
Gas pipe
insulation
Finishing tape
Liquid pipe thermal insulation
24 class
I.D. 0.630-0.709 inch
(16-20mm)
Thickness 0.393 inch (8mm) Min.
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Wing-nut type (Imperial-type)
0.059-0.079 inch (1.5-2.0mm)
Liquid side
1/4 inch
10.4 -12.7ft • Ibf
(14.2-17.2N • m)
Wall
Inter-unit wiring
Liquid pipe
Liquid pipe
insulation
Drain hose
15/18/24 class
I.D. 0.315-0.393 inch
(8-10mm)