Installation Manual
SiMT041311E
69
Installation / Operation Manual
13
Outdoor Unit Installation
4.
Refrigerant piping
CAUTION
Flare nut tightening torque
Gas side
Liquid side
9.5mm
6.4mm
Valve cap tightening torque
Gas side
Liquid side
9.5mm
6.4mm
Service port cap tightening torque
10.8-14.7N · m (110-150kgf · cm)
Torque wrench
Flare nut
Flare nut
Apply oil
Tighten
Spanner
5.
Refrigerant piping work
5-1 Cautions on pipe handling
Be sure to place a cap.
Rain
Wall
5-2 Selection of copper and heat insulation materials
Inter-unit wire
G
Humidifying hose
Finishing tape
Liquid pipe insulation
Liquid pipe
Gas pipe
Gas pipe insulation
Piping bundle diagram
Gas side
Liquid side
Gas pipe thermal insulation
O.D. 9.5mm
O.D. 6.4mm
I.D. 12-15mm
I.D. 8-10mm
Minimum bend radius
Thickness 10mm Min.
30mm or more
Thickness 0.8mm (C1220T-O)
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
• 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.
• Refrigerant oil for R410A can also be used for application to the inner flare.
Do not apply
refrigeration oil to
the outer surface.
Apply refrigeration
oil to the inner
surface of the
flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Piping union
32.7-39.9N · m
(333-407kgf · cm)
14.2-17.2N · m
(144-175kgf · cm)
21.6-27.4N · m
(220-280kgf · cm)
If no flare cap is
available, cover the
flare mouth with tape
to keep dirt or water
out.
• 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.
When using commercial copper pipes and fittings, observe the following:
• 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 max.
Choose heat insulation materials that will withstand this temperature.
• Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Seal the edge of the insulation
if there is a possibility that the
condensation from the stop
valve might drip onto the indoor
unit through the gap between
the insulation and the pipe.
Liquid pipe thermal
insulation
