Installation Manual 45
ENGLISH
Refrigerant piping installation
Thermal insulation of refrigerant piping
Heat
insulation
material
Outer
covering
Ad 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.
• 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
Power lines
Finishing tape
Insulating material
Bad example
Good example
These parts are not insulated.
B
A
C
A
B
C
A
C
D
E
A
B
C
D
E
Transmission lines
F
Liquid pipe
Transmission lines
Transmission lines
Separation
Gas pipe
Power lines
Insulating material
A
B
C
D
E
A
A
B
F
Heat insulation material
Pipe
Outer covering
(Wind the connection part and cutting part of
heat insulation material with a finishing tape.)
Power lines
E
D
D
B
A
C
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 insulation work is insufficient, there is a
possibility of condensation drip, etc. Pay special attention to insulation work to ceiling plenum.
1m
1m
A
B
D
F
G
B
G
D
B
H
I
J
A
E
B
I
A
B
D
C
Inner wall (concealed)
Floor (fireproofing)
Penetrating portion on fire
limit and boundary wall
Roof pipe shaft
Outer wall
Outer wall (exposed)
Penetrations
Sleeve
Heat insulating material
Lagging
Caulking material
Band
Waterproofing layer
Sleeve with edge
Lagging material
Mortar or other incombustible caulking
Incombustible heat insulation 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.)
