Daikin 2MXU40GV1B Kurulum Kılavuzu - Sayfa 11
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Refrigerant Piping Work
Precautions for Laying Refrigerant Piping
• 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.
• 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°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.
Gas side
40 or 50class
O.D. 9.5mm
30mm or more
Thickness 0.8mm (C1220T-O)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
• 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
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 its lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
9
50 class
O.D. 12.7mm
O.D. 6.4mm
Minimum bend radius
40mm or more
30mm or more
Gas pipe thermal insulation
Liquid side
40 class
Set exactly at the position shown below.
A
Die
Be sure to
place a cap.
Rain
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Finishing tape
Gas pipe
Gas pipe
insulation
Liquid pipe insulation
50 class
I.D. 12-15mm
Thickness 13mm Min.
(Cut exactly at
right angles.)
Remove burrs
Flaring
Flare tool for R410A
Clutch-type
Clutch-type (Rigid-type)
A
0-0.5mm
1.0-1.5mm
Flare's inner
surface must
be flaw-free.
Wall
Inter-unit wiring
Drain hose
Humidifying
hose
Liquid pipe
Liquid pipe
thermal insulation
I.D. 8-10mm
Thickness
10mm Min.
Conventional flare tool
Wing-nut type (Imperial-type)
1.5-2.0mm
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
■English