16
GB
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 infl uenced 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.
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 specifi ed 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.
11. Wiring
(For details, refer to the installation manual of each indoor/outdoor unit and controller.)
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
insuffi cient, there is a possibility of condensation drip, etc. Pay special attention
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
Glass fi ber + Steel wire
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:
When using polyethylene cover as covering material, asphalt roofi ng
•
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)
<D> Floor (waterproofi ng)
E
A
B
D
F
G
B
<E> Roof pipe shaft
<F> Penetrating portion on fi re limit and
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
Waterproofi
ng
layer
G
Sleeve with edge
H
Lagging
material
I
Mortar or other incombustible caulking
J
Incombustible heat insulation material
When fi lling 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
•
specifi cations:
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
as the top fl oor of a building, may require the use of insulation materials
thicker than the ones specifi ed in the chart above.
*
When certain specifi cations presented by the client must be met, ensure that
they also meet the specifi cations on the chart above.
WT05788X01_GB_cs2j.indd 16
12/10/2009 11:25:02 AM
