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[ Caution ]
Leak detection will be conducted at each spot for at least 3 minutes. If any leak has been identified, tighten the nut and
perform the detection again until no leaks are found. After completing the leak detection, wrap the exposed IDU pipe
joint with insulation material and tie it with a binding tie to prevent condensation and dripping water.
8
Heat Insulation Treatment
Pipes the liquid and air sides have a low temperature during cooling. Take sufficient insulation measures to prevent
condensation.
[ Caution ]
Be sure to use a thermal insulation material with a heat
resistance of 120°C or higher for the gas pipe.
The attached insulation material for the part of the IDU where
the pipe connects must undergo heat insulation treatment that
leaves no gaps.
Thermal insulation materials directly exposed to the open air
will degrade and lose their insulating properties. For outdoor
pipelines, additional protective treatments should be performed,
such as adding metal duct boxes.
1. Steps of insulating refrigerant piping
Refrigerant pipe
construction
Connecting parts: For example, brazing area, flare, or flange connection shall be insulated after passing the air
tightness test.
2. Reasons why refrigerant piping shall be insulated
(1) The gas pipes and liquid pipes can become extremely hot or cool while in operation. Therefore, they should be
insulated. Otherwise, the cooling and heating effects will be seriously impacted, and the compressor may become
burnt.
(2) The gas pipes are cold when the unit operates in cooling mode. If they are not properly insulated, they may cause
condensation and water leakage.
(3) The outlet pipe (gas pipe) is hot (usually 50–100℃) when the unit operates in heating mode, and accidental contact
with the pipe will cause burns. To avoid burns, the pipes should be insulated.
3. Selection of insulation materials for refrigerant piping
Use the closed-cell foam insulation material, which has a flame retardant level of B1 and heat resistance of over 120℃.
4. Thickness of the insulation layer
When the outer diameter d of the copper pipe is not greater than Φ12.7mm, the thickness δ of insulation layer is greater
than 15mm.
When the outer diameter d of the copper pipe is not smaller than Φ15.9mm, the thickness δ of insulation layer is greater
than 20mm.
[ Caution ]
The above thickness should be increased if the place is hot and humid.
The pipes outdoors should be protected by metal covers to avoid sunlight, rain, weathering, external force or artificial
damage.
Insulation operation (except
connecting parts)
Binding tie
Unit
body
Air tightness test
31
Installation
Onsite
piping side
Insulation at
connecting parts
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