Heat pump 50Hz/R410A
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2. Guideline for each installation process
Part 3 Design and installation
2.4.3 Essential points of thermal insulation
1) Thermal insulation of refrigerant piping
Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe separately with enough
thickness heat-resistant insulation materials, so that no gap is observed in the joint between indoor unit and
insulating material, and insulating materials themselves. When insulation work is insufficient, there is a possibility
of condensation drip, etc. pay special attention to insulation work to ceiling plenum.
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
• Be sure to fully insulate connecting portion.
Liquid pipe
Gas pipe
Insulation
Wrong
method
Correct
method
These parts are not insulated.
A
C
C
C
B
A
A
B
C
Liquid pipe
Gas pipe
Insulation
A
B
C
A
A
B
2) Caution during insulation work
• In case the cables are installed in the conduit, a finishing tape is not required.
• Defect and insufficient insulation can cause condensation drops.
• Binding the insulation too tight may result in dew drops.
• Be sure not to tie rap the insulation but put special taping or the clamp at the connecting portion.
• The insulation overlapping part at the piping connection must be a distance from the flaring part at the pipe connection.
