Thermal Insulation Of Refrigerant Piping - Mitsubishi Electric CITY MULTI PUHY-YMC Installation Manual

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.
B
A
D
A Steel wire
B Piping
C Asphaltic oily mastic or asphalt
D Heat insulation material A
E Outer covering B
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
A
Bad example
B
Good example
Note:
No heat insulation must be provided for electric wires.
22
C
E
B
A Liquid pipe
B Gas pipe
C Electric wire
C
D Finishing tape
E Insulating material
D
E
E
E
A Liquid pipe
B Gas pipe
A
D Finishing tape
E Insulating material
D
Glass fiber + Steel wire
Heat
insulation Adhesive + Heat - resistant polyethylene foam +
material A
Adhesive tape
Indoor Vinyl tape
Outer
Floor exposed Water-proof hemp cloth + Bronze asphalt
covering B
Outdoor Water-proof hemp cloth + Zinc plate + Oily paint
Note:
When using polyethylene cover as covering material, asphalt roof-
ing shall not be required.
• Be sure to fully insulate connecting portion.
A
A These parts are not insulated.