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4. The indoor-heat source transmission line, connect the shield ground to the
grounding terminal (
). For the centralized transmission lines, connect to
the shield terminal (S) on the terminal block (TB7). If the heat source units
whose power supply connector CN41 is replaced with CN40, short circuit the
shield terminal (S) and the ground terminal (
5. Attach the connected wires securely 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.
Caution:
Tighten terminal screws to the specified torque.
- Poor wire contact caused by loose screws may result in overheating and
resultant fire.
- The use of the unit with a damaged circuit board may result in overheating and
resultant fire.
Note:
•
Tighten terminal screws to the specified torque. (*1)
*1: Terminal block (TB1 (M6 screw)) : 2.5 ~ 2.9 [N·m]
Terminal block (TB3, TB7 (M3.5 screw)) : 0.82 ~ 1.0 [N·m]
•
Make sure that the spring washers are parallel to the terminal block.
•
Make sure that the wires are securely fastened to the terminal screws.
•
Drive the screws straight down, and use caution not to damage the
screw heads.
•
Install the ring terminals back to back so that the screws can be driven
straight down.
•
Make an alignment mark with a permanent marker across the screw
head, washer, and terminal after tightening the screws.
11.. 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 [656ft]
•
Maximum length of transmission lines for centralized control and indoor/heat source transmission lines: 500 m [1640ft] at the maximum
The maximum length of wiring between power supply unit for transmission lines (for centralized control), and each heat source unit and system controller is 200 m [656ft].
2. Remote control cables
•
ME Remote Controller
Sheathed 2-core cable
Type of remote control cable
(CVV, shielded CVVS, CPEVS, or MVVS)
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
When 10 m [32ft] is exceeded, use cable
Remarks
with the same specifications as 1. Wiring
transmission cables.
*
Connected with simple remote controller.
CVVS, MVVS: PVC insulated PVC jacketed shielded control cable
CPEVS: PE insulated PVC jacketed shielded communication cable
CVV: PVC insulated PVC sheathed control cable
•
MA Remote Controller
Type of remote control cable
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
Remarks
Within 200 m [656ft]
*
Connected with simple remote controller.
2 Wiring examples
•
Controller name, symbol and maximum 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 in descending order of capacity. (If the capacity
is the same, they will be in ascending order of their address number.)
) in addition to the above.
[AWG16]
2
[AWG 22 to 16]
2
[AWG 18 to 16])*
2
[AWG 22 to 16]
2
[AWG 18 to 16])*
2
Code
OS1, OS2
[Fig. 11..1] (P.11)
A Power source
C Ground terminal
[Fig. 11..] (P.11)
A Terminal block with loose screws
C Spring washers must be parallel to the terminal block.
[Fig. 11..] (P.11)
A Power wires, transmission lines
C Terminal blocks (TB1, TB3, TB7)
E Install the ring terminals back to back.
[Fig. 11..4] (P.11)
A Cable strap
C Ground terminal for field wiring connection
2 Conduit tube installation
•
Hammer 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
burrs and protect the tube with masking tape.
•
Use the conduit tube to narrow the opening if there is a possibility of small
animals entering the unit.
Possible unit connections
OC
– (*2)
– (*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)
B Transmission line
B Properly installed terminal block
B Daisy-chain (transmission lines only)
D Make an alignment mark.
B Power source cable
7
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