Flaring The Pipe End; How To Use Reducers - Daikin 4MXS80E3V3B2 Installation Manual

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.
1 Cut exactly at right angles.
2 Remove burrs.
3 Put the flare nut on the pipe.
4 Flare the pipe.
Flare tool for R410A
Clutch type
A 0~0.5 mm
Set exactly at the position shown above.
5 Check that the flaring is properly made.
1 Flare's inner surface must be flaw-free.
The pipe end must be evenly flared in a
2
perfect circle.
Make sure that the flare nut is fitted.
3
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.
Installation manual
7
1
A
Conventional flare tool
Clutch type Wing nut type
("Ridgid") ("Imperial")
1.0~1.5 mm 1.5~2.0 mm
1

How to use reducers

No. 1 No. 2
Ø15.9 Ø12.7
↓ ↓
Ø12.7 Ø9.5
2
Gasket (1)
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:
5
1 Inter-unit piping
2 Flare nut (for Ø15.9)
3 No. 3
No. 1
2
4
Be sure to attach the gasket
5 Connection port of outdoor unit
3
Connecting a pipe of Ø9.5 to a gas pipe connection port for Ø15.9:
1 Flare nut (for Ø9.5)
2 No. 5
No. 6
3
Be sure to attach the gasket
Connecting a pipe of Ø9.5 to a gas pipe connection port for Ø12.7:
1 Flare nut (for Ø12.7)
2 No. 4
No. 2
3
Be sure to attach the gasket
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.
Flare nut
Ø9.5
Ø12.7
Ø15.9
No. 3 No. 4 No. 5
Ø15.9 Ø12.7 Ø15.9
↓ ↓
Ø12.7 Ø9.5 Ø9.5
Gasket (2) Reducer and gasket
4 3 2
3 2 1
3 2 1
Flare nut tightening torque
32.7~39.9 N•m
(333~407 kgf•cm)
49.5~60.3 N•m
(505~615 kgf•cm)
61.8~75.4 N•m
(630~769 kgf•cm)
No. 6
Ø15.9
↓ ↓
Ø9.5
1