Daikin FTKE35BVM [160/268] Refrigerant piping work
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Daikin FTKE35BVM [160/268] Refrigerant piping work

Daikin FTKE35BVMA [160/268] Refrigerant piping work
ED12-321A Indoor Units
Installation Manual 155
4
,
install as described in the installation manual supplied with the Multi outdoor unit.
1.
Flaring the pipe end.
1) Cut the pipe end with pipe cutterer.
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.
1) Incomplete flaring may cause refrigerant gas leakage.
Warning
125
60
83
503.5 44.5
290
52
1050
99.5
52 90 55
100
100
With a Multi indoor unit
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.
Coat here with refrigeration machine oil
Torque wrench
Piping union
Flare nut
Spanner
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare. (Use
refrigeration oil for R-22)
2-1. Caution on Piping 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.
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
Flare nut tightening torque
Gas side Liquid side
1/2 inch 5/8 inch 1/4 inch 3/8 inch
49.5-60.3N
m 61.8-75.4N
m 14.2-17.2N
m 32.7-39.9N
m
(505-615kgf
cm) (630-770kgf
cm)
(144-175kgf
cm) (333-407kgf
cm)
Valve cap tightening torque
Gas side Liquid side
1/2 inch 5/8 inch 1/4 inch 3/8 inch
26.5-32.3N
m 48.1-59.7N
m 21.6-27.4N
m
(270-330kgf
cm)
(490-610kgf
cm) (220-280kgf
cm)
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe thermal insulation
50 class
O.D. 12.7mm
Thickness 0.8mm
60/71 class
O.D. 15.9mm
Thickness 1.0mm
50/60 class
O.D. 6.4mm
71 class
O.D. 9.5mm
50 class
I.D. 14-16mm
60/71 class
I.D. 16-20mm
50/60 class
I.D. 8-10mm
Thickness 10mm Min.
Thickness 0.8mm
71 class
I.D. 12-15mm
Refrigerant piping work
(Cut exactly at
right angles.) Remove burrs
Set exactly at the position shown below.
A
IMPERIAL
RIGID
1.0 mm
0.5 mm
Flaring
A
Die
Check
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.

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