Daikin Super Multi NX FDKS25EAVMB, Installation Manual

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English

6

OUTDOOR UNIT INSTALLATION 

Install as described in the installation manual supplied with the outdoor unit.

REFRIGERANT PIPING WORK 

See the installation manual supplied with the outdoor unit.

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

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.
Do 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.

2.

REFRIGERANT PIPING

1) To prevent gas leakage, apply refrigeration machine oil on both 

inner and outer surfaces of the flare. (Use refrigeration oil for 
R410A)

2) 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. 
• Use torque wrenches when tightening the flare nuts to prevent 

damage to the flare nuts and escaping gas.

Caution

Overtightening may damage the flare and cause leaks.

For heat pump: If your feet feel cold when using the heating function, it is

recommended that the air discharge grille shown at below be

attached.

(Adjustable angle)

45°

A

A

(Cut exactly at right angles.)

Remove burrs

Flare’s inner surface 
must be flaw-free.

The pipe end must 
be evenly flared in a 
perfect circle.

Make sure that the 
flare nut is fitted.

Check

0-0.5mm

1.0-1.5mm

1.5-2.0mm

Set exactly at the position shown below.

Clutch-type

Flare tool for R410A

Clutch-type (Rigid-type) Wing-nut type (Imperial-type)

Conventional flare tool

Flaring

Die

Flare nut tightening torque

Gas side

Liquid side

3/8 inch

1/2 inch

1/4 inch

32.7-39.9N•m

(333-407kgf•cm)

49.5-60.3N•m

(505-615kgf•cm)

14.2-17.2N•m

(144-175kgf•cm)

01_EN_3P132003-3K.fm  Page 6  Wednesday, September 28, 2005  3:32 PM