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8.4. Thermal insulation of refrigerant piping
Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas
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 to ceiling plenum.
[Fig. 8.4.1] (P.4)
A Steel wire
C Asphaltic oily mastic 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.
9. Wiring
9.1. Caution
1 Follow ordinance of your governmental organization for technical standard re-
lated 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) 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 outdoor unit.
4 Give some allowance to wiring for electrical part box of indoor and outdoor
units, because the box is 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 be burnt out.
6 Use 2-core shield cable for transmission line. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor trans-
mitting and receiving will cause erroneous operations.
7 Only the transmission line specified should be connected to the terminal block
for outdoor unit transmission.
(Transmission line to be connected with indoor unit : Terminal block TB3 for
transmission line, Other : Terminal block TB7 for centralized control)
Erroneous connection does not allow the system to operate.
8 In case to connect with the upper class controller or to conduct group opera-
tion in different refrigerant systems, the control line for transmission is required
between the outdoor units and each other.
Connect this control line between the terminal blocks for centralized control.
9.3. Wiring transmission cables
1 Connecting a transmission booster unit
A transmission booster (RP) is required when the number of connected indoor unit models in a cooling system exceeds the number of models specified in the chart below.
* The maximum number of units that can be controlled is determined by the indoor unit model, the type of remote controller and their capabilities.
(*1)
Capability of the
connected indoor units
one BC controller
200 or lower
two BC controller
one BC controller
200 or higher
two BC controller
*1 If even one unit that is higher than 200 exists in the cooling system, the maximum capacity will be "200 or higher".
2 Types of control cables
1. Wiring transmission cables
•
Types of transmission cables: Shielding wire CVVS or CPEVS
•
Cable diameter: More than 1.25 mm
•
Maximum wiring length: Within 200 m
2. Remote control cables
2-core cable (unshielded)
Kind of remote control cable
Cable diameter
0.3 to 1.25 mm
When 10 m is exceeded, use cable with the same
Remarks
specifications as (1) Transmission line wiring
B Piping
D Heat insulation material A
Number of connected indoor units that can be
connected without a RP
The number of indoor units and the total number of remote controllers is displayed within the parenthesis ( ).
2
2
[Fig. 8.4.2] (P.4)
A Liquid pipe
B Gas pipe
D Finishing tape
E Insulater
[Fig. 8.4.3] (P.4)
Penetrations
[Fig. 8.4.4] (P.4)
<A> Inner wall (concealed)
<C> Outer wall (exposed)
<E> Roof pipe shaft
<F> Penetrating portion on fire limit and boundary wall
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 materi-
als for both insulation and covering. (Vinyl covering should not be used.)
(2-wire line with no polarity)
When conducting group operation in different refrigerant systems without con-
necting to the upper class controller, replace the insertion of the short circuit
connector from CN41 of one outdoor unit to CN40.
9 Group is set by operating the remote controller.
9.2. Control box and connecting position of
wiring
1. Connect the indoor unit transmission line to transmission terminal block (TB3),
or connect the wiring between outdoor units or the wiring with the central con-
trol system to the central control terminal block (TB7).
When using shielded wiring, connect shield ground of the indoor unit transmis-
sion line to the earth screw (
) and connect shield ground of the line between
outdoor units and the central control system transmission line to the shield (S)
terminal of the central control terminal block (TB7) shield (S) terminal. In addi-
tion, in the case of outdoor units whose power supply connector CN41 has
been replaced by CN40, the shield terminal (S) of terminal block (TB7) of the
central control system should also be connected to the ground (
[Fig. 9.2.1] (P.4)
A Power source
2. Conduit mounting plates (ø27) are provided. Pass the power supply and trans-
mission wires through the appropriate knock-out holes, then remove the knock-
out piece from the bottom of the terminal box and connect the wires.
3. Fix power source wiring to terminal box by using buffer bushing for tensile
force (PG connection or the like).
Remote controller type
MA R/C
3 Wiring examples
•
Controller name, symbol and allowable number of controllers.
Name
Symbol
Outdoor unit controller
OC
BC Controller (Master)
BC
BC Controller (Slave)
BS
Transmission booster unit
RP
Indoor Unit Controller
IC
Remote Controller
RC
*1 A transmission booster (RP) may be required depending on the number of
connected indoor unit controllers.
C Electric wire
<B> Outer wall
<D> Floor (fireproofing)
B Heat insulating material
D Caulking material
F Waterproofing laye
H Lagging material
).
B Transmission line
Remote controller
M-NET R/C
32
19 (38)
32
18 (36)
26
15 (30)
26
14 (28)
Allowable number of controllers
One controller for one OC
Zero or one controller for one OC
Zero or one unit for one OC (*1)
Two to twenty four controllers for one OC (*1)
Maximum of two per group
11
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