Daikin RKS71FVM [43/125] 505 615kgf cm 630 770kgf cm 144 175kgf cm
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Daikin RKS71FVM [43/125] 505 615kgf cm 630 770kgf cm 144 175kgf cm

Daikin RKS50FVM [43/125] 505 615kgf cm 630 770kgf cm 144 175kgf cm
Installation Manual ED04-702
42 Room Air Conditioners F-Series
Refrigerant Piping Work
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.
2-1. 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 40mm 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 0.052W/mK (0.035 to 0.045kcal/(mh •ºC))
Refrigerant gas pipe’s surface temperature reaches 110ºC 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.
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.
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
3) Never use piping which has been used for previous installations. Only use parts which are delivered
with the unit.
4) Do never install a drier to this R410A unit in order to guarantee it’s lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
WARNING
2) To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces of the flare.
(Use refrigeration oil for R410A.)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Thickness 10mm Min.
71 class
O.D. 15.9mm
Thickness 1.0mm
50/60 class
O.D. 12.7mm
Thickness 0.8mm
71 class
I.D. 16-20mm
50/60 class
I.D. 14-16mm
Gas side Gas pipe thermal insulation
50/60/71 classs
O.D. 6.4mm
Thickness 0.8mm
50/60/71 class
I.D. 8-10mm
Liquid side Liquid pipe thermal insulation
Flare nut tightening torque
Gas side Liquid side
1/2 inch 5/8 inch 1/4 inch
49.5-60.3N
m 61.8-75.4N m 14.2-17.2N m
(505-615kgf
cm) (630-770kgf cm) (144-175kgf cm)
,
install as described in the installation manual supplied with the Multi outdoor unit.
With a Multi indoor unit
Coat here with refrigeration oil
Torque wrench
Piping union
Flare nut
Spanner
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
(Cut exactly at
right angles.) Remove burrs
Set exactly at the position shown below.
A
Flaring
Die
A 0-0.5mm
Clutch-type
Flare tool for R410A
1.0-1.5mm
Clutch-type (Rigid-type)
1.5-2.0mm
Wing-nut type (Imperial-type)
Conventional flare tool
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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