Wiring; Caution; Control Box And Connecting Position Of Wiring; Wiring Transmission Cables - Mitsubishi Electric CITY MULTI PUHY-P850YSGM-A Manual De Instalación

11. Wiring

11.1. Caution

1 Daisy chain terminals of the terminal block for centralized control transmission
line (TB7) on the main unit (OC) to the terminal block (TB7) on the sub unit
(OS).
Replace the insertion of the short circuit connector on the control board from
CN41 of one main unit to CN40. CN41 on sub units must not be replaced.
Set centralized control switches (SW2-1) on control boards in all main units
to "ON".
2 Follow ordinance of your governmental organization for technical standard re-
lated to electrical equipment, wiring regulations and guidance of each electric
power company.
3 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.)
4 Be sure to provide designated grounding work to outdoor unit.
5 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.
6 Never connect the main power source to terminal block of transmission line. If
connected, electrical parts will be burnt out.
7 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.
8 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 on the
Main unit (OC) for transmission line, Other : Terminal block TB7 for centralized
control)
* Terminal block TB3 on the Sub unit (OS) is not used in this system.
Erroneous connection does not allow the system to operate.
9 Group is set by operating the remote controller.
11.2. 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 earth screw (
Fix the wiring securely in place with the cable strap at the bottom of the termi-
nal block so that the external force if not applied to the terminal block. External
force applied to the terminal block may damage the block and short-circuit,
ground fault, or fire may result.
2 Wiring examples
• Controller name, symbol and allowable number of controllers.
Name
Main unit
Outdoor 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.
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.7)
[Fig. 11.3.2] MA Remote Controller (P.7)
[Fig. 11.3.3] Transmission booster unit (P.7)
<A> Change the jumper connector from CN41 to CN40
<B> SW2-1:ON
<C> Keep the jumper connector on CN41
<D> SW2-1: OFF
A Group 1 B Group 4
( ) Address
[Fig. 11.2.1] (P.6)
2. Conduit mounting plates (ø46, ø53) are being provided. Pass the power sup-
ply and transmission wires through the appropriate knock-out holes, then re-
move 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).
4. Narrow the opening by using a conduit to keep small animals out.

11.3. Wiring transmission cables

1 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
• Maximum length of transmission lines for centralized control and indoor/out-
door transmission lines (Maximum length via indoor 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
• MA Remote Controller
Kind of remote control cable
* Connected with simple remote controller.
).
Code Possible unit connections
OC –
OS 1 unit per 1 OC
IC 1 to 32 units per 1 OC (*1)
RC 2 units maximum per group
RP 0 to 1 unit per 1 OC (*1)
C Group 5 D Shielded wire
A Power source B Transmission line
C Earth screw
2
Sheathed 2-core cable (unshielded)
Cable diameter 0.3 to 1.25 mm
When 10 m is exceeded, use cable with the
Remarks
same specifications as 1. Wiring transmission
cables.
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
Cable diameter
Remarks Within 200 m
E Sub remote controller
2 2
(0.75 to 1.25 mm )*
2 (0.75 to 1.25 mm 2 )*
15