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.
Ⓐ
Heat insulation material
Ⓑ
Pipe
Ⓒ
Outer covering(Wind the connection part
and cutting part of heat insulation material
with a finishing tape.)
Penetrations
Heat insulation
material
Ad Heat - resistant
polyethylene foam + Adhesive tape
Outer
covering
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 roofing shall
not be required.
Bad
example
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
Liquid pipe
Gas pipe
Power cables
Finishing tape
Insulating material
Communication cables
• Be sure to fully insulate connecting portion.
These parts are not insulated.
Good
example
Liquid pipe
Communication cables
Communication cables
Separation
Gas pipe
Power cables
Insulating material
Power cables
Ⓐ
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.)
1m
1m
A
B
D
F
F
G
B
G
D
B
H
I
J
A
E
B
I
A
B
D
C
Inner wall (concealed)
Floor (fireproofing)
Roof pipe shaft
Penetrating portion on fire
limit and boundary wall
Outer wall
Outer wall (exposed)
Heat insulation of refrigerant piping
50
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH