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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
insufficient, there is a possibility of condensation drip, etc. Pay special attention
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
Glass fiber + Steel wire
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:
•
When using polyethylene cover as covering material, asphalt roofing
shall not be required.
•
No heat insulation must be provided for electric wires.
[Fig. 10.4.]
B
E
A
B
C
D
E
A High-pressure pipe
B Low-pressure pipe
D Finishing tape
E Insulator
[Fig. 10.4.]
11. Wiring (For details, refer to the installation manual of each indoor/outdoor unit and controller.)
11.1. Caution
1 Follow ordinance of your governmental organization for technical standard
related to electrical equipment, wiring regulations and guidance of each
electric power company.
2 Wiring for control (hereinafter referred to as transmission line) shall be
(5 cm or more [2 in or more]) apart from power source wiring so that it is
not influenced by electric noise from power source wiring. (Do not insert
transmission line and power source wire in the same conduit.)
3 Be sure to provide designated grounding work to the outdoor unit.
4 Give some allowance to wiring for the electrical part box on the indoor and
outdoor units, because these boxes are sometimes removed at the time of
service work.
5 Never connect the main power source to terminal block of transmission line.
If connected, electrical parts will burn out.
16
B Piping
D Heat insulation material A
E
A
D
C Electric wire
Penetrations
[Fig. 10.4.4]
<A> Inner wall (concealed)
A B
<C> Outer wall (exposed)
E
B
A
<E> Roof pipe shaft
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
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.)
•
Insulation materials for the pipes to be added on-site must meet the following
specifications:
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
as the top floor of a building, may require the use of insulation materials
thicker than the ones specified in the chart above.
*
When certain specifications presented by the client must be met, ensure that
they also meet the specifications on the chart above.
6 Use 2-core shield cable for the transmission line. If transmission lines of
different systems are wired with the same multiplecore cable, the resultant
poor transmitting and receiving will cause erroneous operations.
7 Only the transmission line specified should be connected to the terminal
block for outdoor unit transmission.
Erroneous connection does not allow the system to operate.
8 When connecting a System Controller to outdoor units or performing a
group operation of indoor units that are connected to different outdoor
units, a transmission line for centralized control is required. When using a
transmission line for centralized control, connect the transmission line (non-
polar 2 core wire) to all TB7 terminals between all outdoor units.
9 Grouping is set by operating the remote controller.
(Unit: mm [in])
<B> Outer wall
D
C
A B
<D> Floor (waterproofing)
D
F
G
B
<F> Penetrating portion on fire limit and
boundary wall
I
J
A
1000
1000
[39-3/8]
[39-3/8]
B Heat insulating material
D Caulking material
F Waterproofing layer
H Lagging material
10 mm [13/32 in] or more
20 mm [13/16 in] or more
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