Daikin FTKE25BVMT [152/268] Refrigerant piping work
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Daikin FTKE25BVMT [152/268] Refrigerant piping work

Daikin FTKE25BVMT [152/268] Refrigerant piping work
ED12-321A Indoor Units
Installation Manual 147
4
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.
2.
Refrigerant piping
1) 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.
2) To prevent gas leakage, apply refrigeration machine
oil on both inner and outer surfaces of the flare.
2-1. 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.
(Bending radius should be 30 to 40 mm or larger.)
2-2. 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 0.052kW/mK (0.035 to 0.045 kcal/mh°C)
Refrigerant gas pipe’s surface temperature reaches 110°C 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.
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Incomplete flaring may cause refrigerant gas leakage.
Warning
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe
thermal
insulation
25 class
O.D. 9.5mm
35 class
O.D. 12.7mm
O.D. 6.4mm
Thickness 0.8mm
25 class
I.D. 12-15mm
35 class
I.D. 14-16mm
I.D. 8-10mm
Thickness 10mm Min.Thickness 0.8mm
Refrigerant piping work
(Cut exactly at
right angles.)
Remove burrs
Set exactly at the position shown below.
A
A
IMPERIAL
RIGID
Die
0.5 mm
1.0 mm
Flaring
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/2 inch 1/4 inch
32.7-39.9N
m 49.5-60.3N
m 14.2-17.2N
m
(333-407kgf
cm) (505-615kgf
cm)
(144-175kgf
cm)
Coat here with refrigeration machine oil
Torque wrench
Piping union
Flare nut
Spanner
Flare’s inner
surface must be
flaw-free.
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.

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