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CAUTION
1) 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.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque
wrenches.
Apply refrigeration oil to the inner surface of the flare.
Do not apply refrigeration oil to the outer surface.
Do not apply refrigeration oil to the flare nut to
avoid tightening with excessive torque.
1. Cautions on pipe 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. 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 0.052W/mK (0.035 to 0.045kcal/(mh •˚C)
Refrigerant gas pipe's surface temperature reaches 110˚C (230°F) 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.
Piping size,
Minimum bend
mm (in)
radius
6.35 (1/4") 1-3/16" (30mm) or more
9.52 (3/8") 1-3/16" (30mm) or more
12.70 (1/2") 1-9/16" (40mm) or more
15.88 (5/8") 1-15/16" (50mm) or more 5/128" (1.0mm)
19.05 (3/4") 1-15/16" (50mm) or more
3) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
NOTICE
Do NOT exceed the unitʼs maximum working pressure (see "Max. Allowable Pressure" on the unit name plate).
CAUTION
• Installation of pipe work shall be kept to a minimum and pipe work shall be protected from physical damage and shall not
be installed in an unventilated space.
• Reusable mechanical connectors and flare joints shall be accessible for maintenance purposes.
• Provision shall be made for expansion and contraction of long runs of piping.
• Protection devices, piping, and fittings shall be protected as far as possible against adverse environmental effects, for
example, the danger of water collecting and freezing in relief pipes or the accumulation of dirt and debris.
• Piping in refrigeration systems shall be so designed and installed to minimize the likelihood of hydraulic shock damaging
the system.
• Precautions shall be taken to avoid excessive vibration or pulsation.
REFRIGERANT PIPING
[Apply oil]
Flare nut
Piping
Thermal insulation
thickness
size
I.D. 5/16" (8mm) - 13/32" (10mm)
1/32" (0.8mm)
I.D. 15/32" (12mm) - 9/16" (14mm)
(C1220T-O)
I.D. 9/16" (14mm) - 10/16" (16mm)
I.D. 10/16" (16mm) - 25/32" (20mm)
(C1220T-O)
I.D. 25/32" (20mm) - 15/16" (24mm)
1-11
[Tighten]
Torque wrench
Spanner
Pipe union
Flare nut
Pipe Size, mm (in)
Torque, Nm/(lbf-ft)
6.35 (1/4")
14.2-17.2 /(10-1/2 – 12-3/4)
9.52 (3/8")
32.7-39.9 /(24-1/8 – 29-1/2)
12.70 (1/2")
49.5-60.3 /(36-1/2 – 44-1/2)
15.88 (5/8")
61.8-75.4 /(45-5/8 – 55-5/8)
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.
Thermal insulation
thickness
Inter-unit wire
Gas pipe
13/32" (10mm) Min.
Gas pipe
insulation
Finishing tape
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
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