Installation
Page 100
9. Engineering of Insulation
9.1 Insulation of refrigerant pipe
1. Operational procedure of refrigerant pipe
insulation
Cut the suitable pipe → insulation (except joint section) →
flare the pipe → piping layout and connection→ vacuum
drying → insulate the joint parts
2. Purpose of refrigerant pipe insulation
• During operation, temperature of gas pipe and
liquid pipe shall be over-heating or over-cooling
extremely. Therefore, it is necessary to carry out in-
sulation; otherwise it shall debase the performance
of unit and burn compressor.
• Gas pipe temperature is very low during cooling.
If insulation is not enough, it shall form dew and
cause leakage.
• Temperature of gas pipe is very high (generally
50-100℃) during heating. Insulation work must be
carried out to prevent hurt by carelessness touching.
3. Insulation material selection for refrigerant pipe
• The burning performance should over 120℃
• According to the local law to choose insulation
materials
• The thickness of insulation layer shall be above
10mm.If in hot or wet environment place, the layer
of insulation should be thicker accordingly.
4. Installation highlights of insulation construction
• Gas pipe and liquid pipe shall be insulated sepa-
rately, if the gas pipe and liquid pipe were insulated
together; it will decrease the performance of air
conditioner.
• The insulation material at the joint pipe shall be
5~10cm longer than the gap of the insulation mate-
rial.
• The insulation material at the joint pipe shall be
inserted into the gap of the insulation material.
• The insulation material at the joint pipe shall be
banded to the gap pipe and liquid pipe tightly.
• The linking part should be use glue to paste to-
gether
• Be sure not bind the insulation material over-tight, it
may extrude out the air in the material to cause bad
insulation and cause easy aging of the material.
9.2 Insulation of drainage pipe
1. Operational procedure of refrigerant pipe
insulation
Select the suitable pipe → insulation (except joint section)
→ piping layout and connection→ drainage test→ insulate
the joint parts
2. Purpose of drainage pipe insulation
The temperature of condensate drainage water is very low.
If insulation is not enough, it shall form dew and cause
leakage to damage the house decoration.
3. Insulation material selection for drainage pipe
• The insulation material should be flame retardant
material, the flame retardancy of the material should
be selected according to the local law.
• Thickness of insulation layer is usually above 10mm.
• Use specific glue to paste the seam of insulation ma-
terial, and then bind with adhesive tape. The width
of tape shall not be less than 5cm. Make sure it is
firm and avoid dew.
4. Installation and highlights of insulation
construction
• The single pipe should be insulated before connect-
ing to another pipe, the joint part should be insu-
lated after the drainage test.
• There should be no insulation gap between the
insulation material.
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