Thermal Insulation Of Refrigerant Piping - Mitsubishi Electric CITY MULTI PUMY-71 Manuel D'installation

7.6. Thermal insulation of refrigerant piping

Be sure to carry out insulation work to refrigerant piping by covering
liquid or high pressure pipe and gas or low pressure 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 insulation work is insufficient, there is a
possibility of condensation drip, etc. Pay special attention to insulation
work to ceiling plenum.
Piping
Steel wire
Insulating material A
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
A
Bad example
B
Good example
Penetrations
Inner wall (concealed)
Sleeve
Floor (Waterproofing)
Caulking material
Sleeve with edge
Insulating material
When filling a gap with mortar, cover the penetration part with steel plate so that the insulation material will not be caved in. For this part, use
incombustible materials for both insulation and covering. (Vinyl covering should not be used.)
Branch pipe
Branch pipes must be insulated using the insulator supplied with the optional branch piping kit.
14
Asphaltic oily mastic
or asphalt
Exterior B
B
A Liquid or high pressure
pipe
B Gas or low pressure pipe
C
C Electric wire
D Finishing tape
D
E Insulating material
E
D
A Insulating material
A
B Gas or low pressure pipe
E
C Electric wire
D Finishing tape
E Liquid or high pressure
pipe
C
Caulking material
Lagging
Insulating material
Sleeve with edge
Waterproofing layer
Glass fiber + Steel wire
Insulating
Adhesive + Heat - resistant polyethylene foam (10mm or
material A
thicker) + Adhesive tape
Indoor
Exterior B Floor exposed Water-proof hemp cloth + Bronze asphalt
Outdoor
Note:
When using polyethylene cover as covering material, asphalt shall
not be required.
• Be sure to fully insulate connecting portion.
Outer wall
Sleeve
Insulating
material
Roof pipe shaft
incombustibles such
Caulking material
Insulating material
Lagging material
Waterproofing
layer
Vinyl tape
Water-proof hemp cloth + Zinc plate + Oily paint
Not insulated.
Outer wall (exposed)
Band
Sleeve
Penetrating portion on fire limit and boundary wall
Caulking with
as mortar
Sleeve
1m 1m
Insulating
material
Incombustible
insulating mate-
rial