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Installation manual
7
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.
Set exactly at the position shown above.
5
Check that the flaring is properly made.
How to use reducers
Use the reducers supplied with the unit as described below.
Connecting a pipe of Ø12.7 to a gas pipe connection port for Ø15.9:
Connecting a pipe of Ø9.5 to a gas pipe connection port for Ø15.9:
Connecting a pipe of Ø9.5 to a gas pipe connection port for Ø12.7:
When using the reducer packing shown above, be careful not to
overtighten the nut, or the smaller pipe may be damaged.
(Approx. 2/3 - 1x the normal torque)
Apply a coat of refrigeration oil to the threaded connection port
of the outdoor unit where the flare nut comes in.
Use an appropriate torque wrench to avoid damaging the
connection thread by overtightening the flare nut.
1
Cut exactly at right angles.
2
Remove burrs.
Flare tool for R410A
Conventional flare tool
Clutch type
Clutch type
("Ridgid")
Wing nut type
("Imperial")
A
0~0.5 mm
1.0~1.5 mm
1.5~2.0 mm
1
Flare's inner surface must be flaw-free.
2
The pipe end must be evenly flared in a
perfect circle.
3
Make sure that the flare nut is fitted.
WARNING
Do not use mineral oil on flared part.
Prevent mineral oil from getting into the system as this
would reduce the lifetime of the units.
Never use piping which has been used for previous
installations. Only use parts which are delivered with
the unit.
Never install a drier to this R410A unit in order to
guarantee its lifetime. The drying material may
dissolve and damage the system.
Incomplete flaring may cause refrigerant gas leakage.
1
2
A
1
2
3
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
Ø15.9
↓
Ø12.7
Ø12.7
↓
Ø9.5
Ø15.9
↓
Ø12.7
Ø12.7
↓
Ø9.5
Ø15.9
↓
Ø9.5
Ø15.9
↓
Ø9.5
Gasket (1)
Gasket (2)
Reducer and gasket
1
Inter-unit piping
2
Flare nut (for Ø15.9)
3
No. 3
4
No. 1
Be sure to attach the gasket
5
Connection port of outdoor unit
1
Flare nut (for Ø9.5)
2
No. 5
3
No. 6
Be sure to attach the gasket
1
Flare nut (for Ø12.7)
2
No. 4
3
No. 2
Be sure to attach the gasket
Flare nut
Flare nut tightening torque
Ø9.5
32.7~39.9 N•m
(333~407 kgf•cm)
Ø12.7
49.5~60.3 N•m
(505~615 kgf•cm)
Ø15.9
61.8~75.4 N•m
(630~769 kgf•cm)
5
4
1
3
2
3
2
1
3
2
1