19
G
B
11.3. Wiring transmission cables
1
Types of control cables
1. Wiring transmission cables
Types of transmission cables: Shielding wire CVVS, CPEVS or MVVS
Cable diameter: More than 1.25 mm
2
Maximum wiring length: Within 200 m
Maximum length of transmission lines for centralized control and indoor/outdoor transmission lines (Maximum length via outdoor units): 500 m MAX
The maximum length of the wiring between power supply unit for transmission lines (on the transmission lines for centralized control) and each outdoor unit and
system controller is 200 m.
2. Remote control cables
M-NET Remote Controller
Kind of remote control cable
Sheathed 2-core cable (unshielded) CVV
Cable diameter
0.3 to 1.25 mm
2
(0.75 to 1.25 mm
2
)*
Remarks
When 10 m is exceeded, use cable with
the same speci
Þ
cations as 1. Wiring
transmission cables.
MA Remote Controller
Kind of remote control cable
Sheathed 2-core cable (unshielded) CVV
Cable diameter
0.3 to 1.25 mm
2
(0.75 to 1.25 mm
2
)*
Remarks
Within 200 m
*
Connected with simple remote controller.
2
Wiring examples
Controller name, symbol and allowable number of controllers.
Name
Code
Possible unit connections
Outdoor unit
Main unit
OC
– (*2)
Sub unit
OS
– (*2)
BC controller
Main unit
BC
One controller for one OC
Sub unit
BS
Zero, one or two controllers for one OC
Indoor unit
Indoor unit controller
IC
1 to 50 units per 1 OC (*1)
Remote controller
Remote controller (*1)
RC
2 units maximum per group
Other
Transmission booster unit
RP
0 to 2 units per 1 OC (*1)
*1 A transmission booster (RP) may be required depending on the number of connected indoor unit controllers.
*2 OC and OS of the outdoor units in the same refrigerant system are automatically identi
Þ
ed. They are identi
Þ
ed as OC and OS in descending order of capacity. (If the
capacity is the same, they will be in ascending order of their address number.)
Example of a group operation system with multiple outdoor units (Shielding wires and address setting are
necessary.)
<Examples of transmission cable wiring>
[Fig. 11.3.1] M-NET Remote Controller (P.8)
*1: When the power supply unit is not connected to the transmission line for centralized control, disconnect the male power supply connector (CN41) from ONE
outdoor unit in the system and connect it to CN40.
*2: If a system controller is used, set SW2-1 on all of the outdoor units to ON.
[Fig. 11.3.2] MA Remote Controller (P.9)
<A> Change the jumper connector from CN41 to CN40
<B> SW2-1:ON
<C> Keep the jumper connector on CN41
A
Group 1
B
Group 3
C
Group 5
D
Shielded wire
E
Sub remote controller
( )
Address
[Fig. 11.3.3] Combination of outdoor units and transmission booster unit (P.9)
( ) Address
Daisy-chain terminals (TB3) on outdoor units in the same refrigerant system together.
Leave the power jumper connector on CN41 as it is. When connecting a system controller to the transmission line (TB7) for centralized control, refer to
[Fig. 11.3.1], [Fig. 11.3.2], or DATA BOOK.
<Wiring Method and Address Settings>
a. Always use shielded wire when making connections between the outdoor unit (OC) and the indoor unit (IC), as well for all OC-OC, OC-OS and IC-IC wiring intervals.
b. Use feed wiring to connect terminals M1 and M2 and the earth terminal
on the transmission line terminal block (TB3) of each outdoor unit (OC) to terminals M1,
M2 and terminal S on the transmission line block of the indoor unit (IC). For OC and OS, connect TB3 to TB3.
c. Connect terminals 1 (M1) and 2 (M2) on the transmission line 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 in a different refrigerant system (OC). For OC
and OS in the same refrigerant system, connect TB7 to TB7.
e. When the power supply unit is not installed on the central control transmission line, change the jumper connector on the control board from CN41 to CN40 on only
one outdoor unit in the system.
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
the step above to the earth 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.
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