20
GB
10.4. Thermal insulation of refrigerant
piping
Be sure to add insulation work to refrigerant piping by covering high-pressure
pipe and 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
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to insulation work in the ceiling plenum.
[Fig. 10.4.1]
C
A
B
D
E
A
Steel
wire
B
Piping
C
Oily mastic asphalt or asphalt
D
Heat insulation material A
E
Outer covering B
Heat
insulation
material A
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Ad Heat - resistant polyethylene foam + Adhesive tape
Outer
covering B
Indoor
Vinyl tape
Floor exposed Water-proof hemp cloth + Bronze asphalt
Outdoor
Water-proof hemp cloth + Zinc plate + Oily paint
Note:
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shall not be required.
No heat insulation must be provided for electric wires.
[Fig. 10.4.2]
B
A
D
C
E
E
E
D
A
B
A
High-pressure
pipe
B
Low-pressure
pipe
C
Electric
wire
D
Finishing
tape
E
Insulator
[Fig. 10.4.3]
Penetrations
[Fig. 10.4.4]
(Unit: mm [in])
<A> Inner wall (concealed)
<B> Outer wall
A B
A B
D
C
<C> Outer wall (exposed)
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E
A
B
D
F
G
B
<E> Roof pipe shaft
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boundary wall
F
H
D
B
G
I
A
J
1000
1000
[39-3/8]
[39-3/8]
A
Sleeve
B
Heat insulating material
C
Lagging
D
Caulking
material
E
Band
F
:DWHUSURR¿QJOD\HU
G
Sleeve with edge
H
Lagging
material
I
Mortar or other incombustible caulking
J
Incombustible heat insulation material
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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.)
Insulation materials for the pipes to be added on-site must meet the following
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Outdoor unit
-BC controller
High-pressure pipe
10 mm [13/32 in] or more
Low-pressure pipe
20 mm [13/16 in] or more
BC controller
-indoor unit
Pipe size 6.35 mm to 25.4 mm [1/4 in to 1 in]
10 mm min. [13/32 in min.]
Pipe size 28.58 mm to 38.1 mm [1-1/8 in to 1-21/32 in]
15 mm min. [19/32 in min.]
*
Installation of pipes in a high-temperature high-humidity environment, such
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