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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
54
Thermal insulation of refrigerant piping
Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe sepa-
rately 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 insula-
tion work is insufficient, there is a possibility of condensation drip, etc. Pay special attention to in-
sulation 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.)
• Do not insulate gas or low pressure pipe and liquid or high
pressurepipe together.
Bad
example
Good
example
Liquid pipe
Gas pipe
Power cables
Penetrations
Inner wall (concealed)
C
A
B
Floor (fireproofing)
Roof pipe shaft
D
F
G
B
Liquid pipe
Gas pipe
Power cables
Finishing tape
Insulating material
Communication cables
Power cables
Communication cables
Separ
-ation
Insulating material
Communication cables
Outer wall
Outer wall (exposed)
D
B
A
Penetrating portion on fire
limit and boundary wall
I
G
D
B
H
A
1m
Heat insulation
Adhesive + Heat - resistant poly-
material
ethylene foam + Adhesive tape
Indoor
Floor ex-
Outer
posed
covering
Outdoor Water-proof hemp cloth +
NOTE
!
When using polyethylene cover as cover-
ing material, asphalt roofing shall not be
required.
• Be sure to fully insulate connecting portion.
Ⓐ Sleeve
Ⓑ Heat insulating material
E
Ⓒ Lagging
B
Ⓓ Caulking material
Ⓔ Band
I
Ⓕ Waterproofing layer
Ⓖ Sleeve with edge
Ⓗ Lagging material
Ⓘ Mortar or other incombustible caulking
Ⓙ Incombustible heat insulation material
J
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 mate-
rials for both insulation and covering.
1m
(Vinyl covering should not be used.)
Vinyl tape
Water-proof hemp cloth +
Bronze asphalt
Zinc plate + Oily paint
These parts are not insulated.
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