19
ENGLISH
33
5-3.
Insulating the Refrigerant Tubing
Tubing Insulation
●
Standard Selection of Insulation Material
Under the environment of the high temperature and high
humidity, the surface of the insulation material is easy
to become condensation. This will result in leakage and
dew drop. See the chart shown below when selecting the
insulation material. In case that the ambient temperature and
relative humidity are placed above the line of the insulation
thickness, the condensation may occasionally make a dew
drop on the surface of the insulation material. In this case,
select the better insulation efficiency.
*
However, since the condition will be different due to
the sort of the insulaton material and the environmental
condition of the installation place, see the chart shown
below as a reference when making a selection.
Standard Selection of Tubing Insulation
Sort of insulation material
Polyethylene heat resisting
material
Upper limits of usage
temperature
Gas tubing : 120 °C or above
Other tubing : 80 °C or above
Calculating condition
Thermal conductivity
of insulation material
0.043 W/(m · K)
(Average temperature 23 °C)
Refrigerant temperature
2 °C
Two tubes arranged together
40
10
20
30
40
50
50
60
70
80
90
100
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
40
50
60
70
80
90
100
40
50
60
70
80
90
100
40
50
60
70
80
90
100
40
50
60
70
80
90
100
40
50
60
70
80
90
100
40
50
60
70
80
90
100
o6.35
o15.88
o25.4
o19.05
o22.22
o9.52
o12.7
Liquid tube
Gas tube
Ambient temperature [°C]
Ambient temperature [°C]
Ambient temperature [°C]
Ambient temperature [°C]
Ambient temperature [°C]
Ambient temperature [°C]
Ambient temperature [°C]
Thickness 30mm
Thickness 30mm
Thickness 30mm
Thickness 30mm
Thickness 30mm
Thickness 30mm
Thickness 30mm
Thickness 20mm
Thickness 20mm
Thickness 20mm
Thickness 20mm
Thickness 20mm
Thickness 20mm
Thickness 20mm
Thickness 10mm
Thickness 10mm
Thickness 10mm
Thickness 10mm
Thickness 10mm
Thickness 10mm
Thickness 10mm
Insulation
Ambient relative humidity [%]
Ambient relative humidity [%]
Ambient relative humidity [%]
Ambient relative humidity [%]
Ambient relative humidity [%]
Ambient relative humidity [%]
Ambient relative humidity [%]
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34
Sealer
Flare insulator
Tube insulator
Vinyl clamps
Flare nut
Unit side
insulator
Insulation tape (white)
CAUTION
If the exterior of the outdoor unit valves
has been
¿
nished with a square duct
covering, make sure you allow suf
¿
cient
space to use the valves and to allow the
panels to be attached and removed.
Taping the flare nuts
Wind the white insulation tape around the flare nuts at the gas
tube connections. Then cover up the tubing connections with
the flare insulator, and fill the gap at the union with the supplied
black insulation tape. Finally, fasten the insulator at both ends
with the supplied vinyl clamps.
Refrigerant tubing and insulator
Drain pipe and insulator
Drain insulator and clamp
Packing
clamp
The procedure used for
installing the insulator
for both gas and liquid
tubes is the same.
Seal
Flare
insulator
Vinyl
clamp
Insulation
tape
Never grasp the drain or refrigerant connecting outlets
when moving the unit.
Insulation material
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must not
easily absorb moisture.
Be sure to use the heat-resistant insulator corresponding to the
gas tube of 120 °C or above and other tubes of 80 °C or above.
CAUTION
After a tube has been insulated, never try
to bend it into a narrow curve because it
can cause the tube to break or crack.
Small hose
band
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00̲280434̲Mini̲VRF̲Mentsuke.indb 19
00̲280434̲Mini̲VRF̲Mentsuke.indb 19
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2016/06/16 11:37:42
