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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
to insulation work in the ceiling plenum.
[Fig. 10.4.1]
C
B
A
D
E
A Steel wire
C Oily mastic asphalt or asphalt
E Outer covering B
Heat
insulation
Adhesive + Heat - resistant polyethylene foam + Adhesive tape
material A
Indoor
Vinyl tape
Outer
Floor exposed Water-proof hemp cloth + Bronze asphalt
covering B
Outdoor
Water-proof hemp cloth + Zinc plate + Oily paint
Note:
shall not be required.
No heat insulation must be provided for electric wires.
[Fig. 10.4.2]
B
E
A
B
C
D
E
A High-pressure pipe
B Low-pressure pipe
D Finishing tape
E Insulator
[Fig. 10.4.3]
20
B Piping
D Heat insulation material A
E
A
D
C Electric wire
Penetrations
[Fig. 10.4.4]
A B
E
B
A
G
D
B
H
F
A Sleeve
C Lagging
E Band
G Sleeve with edge
I Mortar or other incombustible caulking
J Incombustible heat insulation material
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
Outdoor unit
High-pressure pipe
-BC controller
Low-pressure pipe
Pipe size 6.35 mm to 25.4 mm [1/4 in to 1 in]
BC controller
10 mm min. [13/32 in min.]
-indoor unit
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
(Unit: mm [in])
Outer wall
D
C
A B
D
F
G
B
boundary wall
I
J
A
1000
1000
[39-3/8]
[39-3/8]
B Heat insulating material
D Caulking material
F
H Lagging material
10 mm [13/32 in] or more
20 mm [13/16 in] or more
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