Carrier 38QUA009DS, Service Manual, Page: 79 / 116

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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 insulation; 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
separately, if the gas pipe and liquid pipe
were insulated together; it will decrease the
performance of air conditioner.
Liquid pipe Insulation meterial Gas pipe

The insulation material at the joint pipe
shall be 5~10cm longer than the gap of the
insulation material.

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
together

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.
13.8.2 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 material, 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
connecting to another pipe, the joint part
should be insulated after the drainage test.

There should be no insulation gap between
the insulation material.
Engineering of electrical wiring
1 Highlights of electrical wiring
installation