6. SYSTEM DESIGN
SELECTION OF PIPE HEAT INSULATING MATERIAL2-4.
Always insulate the refrigerant pipe to prevent condensation and water droplets by the refrigerant
pipe.
Decide the thickness of the heat insulating material by referring to the recommended minimum
thicness in abe . or instaation condition huidit huidit
huidit huidit
When the outdoor unit is installed in a higher position than the indoor unit, fill the connecting part
gap with putty, etc. to prevent the dew condensation water of the valve of the outdoor unit from
flowing to the indoors from the gap between the pipe and the heat insulating material.
Liquid pipe and gas pipe should be completely insulated with same specification.
In case not to insulate and not to seal refrigerant pipe completely, it will become the cause of
water leak.
Table1 Size of refrigerant pipe and recommended minimum thickness of heat insulating
material
(In case a heat insulating material which thermal conductivity is equal to or less than 0.040 W/(m·k) is
used. )
Recommended minimum thickness for heat
insulating material (mm)
Relative humidity
Refrigerant pipe
Outside diameter
mm (in.)
6.35 (1/4") 8 10 13 17
9.52 (3/8") 9 11 14 18
12.70 (1/2") 10 12 15 19
15.88 (5/8") 10 12 16 20
19.05 (3/4") 10 13 16 21
When an ambient temperature and relative humidity exceed 32°C DB and 85% respectively,
please strengthen heat insulation of refrigerant pipe. If necessary put a heat insulation on indoor
unit casing. When not strengthening heat insulation of refrigerant pipe, the surface of the heat
insulation may be dewed.
Since gas pipe becomes high temperature at heating operation for heatpump type, please select
the heat insulating material which heat-resistant temperature is 120°C or more.
Gas pipe Gas pipe
Connection cable
Finishing tape
Heat insulation Heat insulation
Liquid pipe
Liquid pipe
Make sure that pipe is covered completely by the heat insulation,not exposing to air. Inadequate
heat insulation may cause condensation.
Do not cover heat insulation gas and liquid pipes together as above figure. It may cause
condensation and capacity drop by heat loss.
- (06 - 17) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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