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4. In the case of indoor-heat source transmission line, connect the shield
ground to the grounding terminal (
centralized control, connect it to the shield terminal (S) on the terminal block
for centralized control (TB7). Furthermore, in the case of the heat source
units whose power supply connector CN41 is replaced with CN40, short
circuit the shield terminal (S) and the grounding terminal (
the above.
5. Fix the connected wires securely in place with the cable strap at the bottom
of the terminal block. External force applied to the terminal block may
damage it resulting in a short circuit, ground fault, or a fire.
[Fig. 11.2.1] (P.10)
A Power source
C Earth screw
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
•
Maximum wiring length: Within 200 m
•
Maximum length of transmission lines for centralized control and indoor/heat source transmission lines (Maximum length via heat source 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 heat source 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
When 10 m is exceeded, use cable with
Remarks
the same specifications 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
Remarks
Within 200 m
*
Connected with simple remote controller.
2 Wiring examples
•
Controller name, symbol and allowable number of controllers.
Name
Heat source unit
Main unit
Sub unit
BC controller
Main unit
Sub unit
Indoor unit
Indoor unit controller
Remote controller
Remote controller (*1)
Other
Transmission booster unit
*1 A transmission booster (RP) may be required depending on the number of connected indoor unit controllers.
*2 OC and OS of the heat source units in the same refrigerant system are automatically identified. They are identified 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 heat source units (Shielding wires and address setting are
necessary.)
<Examples of transmission cable wiring>
[Fig. 11.3.1] [Fig. 11.3.3] [Fig. 11.3.4] [Fig. 11.3.6] M-NET Remote Controller (P.11, 12, 13)
*1: For [Fig. 11.3.1] [Fig. 11.3.4]
When the power supply unit is not connected to the transmission line for centralized control, disconnect the male power supply connector (CN41) from ONE
heat source unit in the system and connect it to CN40.
*2: If a system controller is used, set SW2-1 on all of the heat source units to ON.
[Fig. 11.3.2] [Fig. 11.3.5] MA Remote Controller (P.11, 13)
<A> Change the jumper connector from CN41 to CN40
<B> SW2-1:ON
<C> Keep the jumper connector on CN41
Group 1
A
B
( )
Address
[Fig. 11.3.3] [Fig. 11.3.6] Combination of heat source units and transmission booster unit (P.12, 13)
•
( ) Address
•
Daisy-chain terminals (TB3) on heat source 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 [Fig. 11.3.4], [Fig. 11.3.5] or DATA BOOK.
26
). In the case of transmission lines for
) in addition to
B Transmission line
2
(0.75 to 1.25 mm
)*
2
2
(0.75 to 1.25 mm
)*
2
2
Group 3
C Group 5
[Fig. 11.2.2] (P.10)
A Cable strap
C Ground terminal for connection to field wiring
2 Conduit tube installation
•
Close by hammering the knockout holes for the conduit tube located on the
base and the bottom part of the front panel.
•
When installing the conduit tube directly through the knockout holes, remove
the burr and protect the tube with masking tape.
•
Use the conduit tube to narrow down the opening if there is a possibility of
small animals entering the unit.
Code
Possible unit connections
OC
– (*2)
OS
– (*2)
BC
One controller for one OC
BS
Zero, one or two controllers for one OC
IC
1 to 50 units per 1 OC (*1)
RC
2 units maximum per group
RP
0 to 2 units per 1 OC (*1)
Shielded wire
Sub remote controller
D
E
B Power source cable
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