19
GB
D
F
I
NL
E
P
GR
RU
TR
10.3. 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.
The number of indoor units and the total number of remote controllers is displayed within the parenthesis (
).
*1 If even one unit that is higher than 200 exists in the cooling system, the maximum capacity will be “200 or higher”.
Remote controller
MA R/C
M-NET R/C
32
20 (40)
26
16 (32)
(*1)
Capability of the
connected indoor units
Remote controller type
Number of connected indoor units that can be
connected without a RP
200 or lower
200 or higher
No OS
One OS
No OS
One OS
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
2
•
Maximum wiring length: Within 200 m
2. Remote control cables
3
Wiring examples
•
Controller name, symbol and allowable number of controllers.
*1 A transmission booster (RP) may be required depending on the number of connected indoor unit controllers.
Example of a group operation system with multiple outdoor units (Shielding wires and address setting are
necessary.)
<Examples of Transmission Cable Wiring>
[Fig. 10.3.1]
M-NET Remote controller (P.8)
[Fig. 10.3.2]
MA Remote controller (P.9)
[Fig. 10.3.3]
Transmission booster unit (P.9)
A
Group 1
B
Group 4
C
Group 5
D
Shielded Wire
E
Sub Remote Controller
( ) Address
<Wiring Method and Address Settings>
a. Always use shielded wire when making connections between the variable capacity unit controller (OC), the indoor unit (IC) and constant capacity unit controller (OS) as
well for all OC-OC, and IC-IC wiring intervals.
b. Use feed wiring to connect terminals M1 and M2 and the ground terminal on the transmission cable terminal block (TB3) of each variable capacity unit controller (OC),
and constant capacity unit controller (OS) to terminals M1, M2 and terminal S on the transmission cable block of the indoor unit (IC) and BC controller (BC, BS*1).
(*1: Case of R2/WR2/BIG-R2 series)
c.
Connect terminals 1 (M1) and 2 (M2) on the transmission cable terminal block of the indoor unit (IC) that has the most recent address within the same group to the
terminal block on the remote controller (RC).
d. Connect together terminals M1, M2 and terminal S on the terminal block for central control (TB7) for the outdoor unit (OC).
e. On one outdoor unit only, change the jumper connector on the control panel from CN41 to CN40.
f.
Connect the terminal S on the terminal block for central control (TB7) for the outdoor unit (OC) for the unit into which the jumper connector was inserted into CN40 in Step
above to the ground terminal
in the electrical component box.
g. Set the address setting switch as follows.
*
To set the outdoor unit address to 100, the outdoor address setting switch must be set to 50.
To set the M-NET R/C address to 200, the M-NET R/C address setting switch must be set to 00.
Kind of remote control cable
Cable diameter
Remarks
(case of M-NET R/C)
2-core cable (unshielded)
0.3 to 1.25 mm
2
When 10 m is exceeded, use cable with the same
specifications as (1) Transmission line wiring
Name
Code
Possible unit connections
Outdoor unit
Indoor unit
Remote controller
Other
Variable capacity unit controller
Constant capacity unit controller
Indoor unit controller
Remote controller (*1)
Transmission booster unit
–
1 unit per 1 OC
2 to 32 units per 1 OC (*1)
2 units maximum per group
0 to 1 unit per 1 OC (*1)
OC
OS
IC
RC
RP
10.2. 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. 10.2.1] / [Fig. 10.2.2]
(P.8)
A
Power source
B
Transmission line
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).
