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E
E
D
A
B
10.8. 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
polyethylene, so that no gap is observed in the joint between indoor unit
and insulating material, and insulating materials themselves. When in-
sulation work is insufficient, there is a possibility of condensation drip,
etc. Pay special attention to insulation work to ceiling plenum.
C
A
B
D
E
A Steel wire
B Piping
C Asphaltic oily mastic or asphalt
D Heat insulation material A
E Outer covering B
Heat
insulation
material A
Outer
covering B
Glass fiber + Steel wire
Adhesive + Heat - resistant polyethylene foam +
Adhesive tape
Indoor Vinyl tape
Floor exposed
Water-proof hemp cloth + Bronze asphalt
Outdoor
Water-proof hemp cloth + Zinc plate + Oily paint
Note:
When using polyethylene cover as covering material, asphalt roof-
ing shall not be required.
A
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
• Be sure to fully insulate connecting portion.
A Liquid pipe
B Gas pipe
C Electric wire
D Finishing tape
E Insulating material
A Liquid pipe
B Gas pipe
D Finishing tape
E Insulating material
Bad example
Good example
A These parts are not insulated.
Note:
No heat insulation must be provided for electric wires.
B
A
D
C
E