Mitsubishi Electric CITY MULTI PUMY-P NHMU Série Manuel D'installation page 9

6. Electrical work
L1 L2 GR M1 M2 S M1 M2 S
A
TB3 TB7
B
A : Power source
B : Transmission line
Fig. 6-1
6.3. 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 mm2 [AWG16]
• Maximum wiring length: Within 200 m [656 ft]
2. M-NET Remote control cables
Kind of remote control cable Shielding wire MVVS
Cable diameter 0.5 to 1.25 mm
When 10 m [32 ft] is exceeded, use cable with the
Remarks
same specifications as transmission line wiring
Example of a group operation system with multiple outdoor units (Shielding wires and address setting are nec-
essary.)
<Examples of Transmission Cable Wiring>
M-NET Remote Controller (Fig. 6-2)
MA Remote Controller (Fig. 6-3)
<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, 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 outdoor unit (OC) to terminals M1, M2
and terminal S on the transmission cable block of the indoor unit (IC).
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. The jumper connector CN41 on the control panel does not change.
f. Connect the terminal S on the terminal block for central control for the power supply unit to the ground terminal (
g. Set the address setting switch as follows.
Unit Range
IC (Main) 01 to 50
IC (Sub) 01 to 50
Outdoor Unit 51 to 100
M-NET R/C (Main) 101 to 150
M-NET R/C (Sub) 151 to 200
MA R/C –
h. The group setting operations among the multiple indoor units is done by the remote controller (RC) after the electrical power has been turned on.
<Permissible Lengths>
1 M-NET Remote controller
• Max length via outdoor units: L +L
1
• Max transmission cable length: L
ℓ
• Remote controller cable length:
If the length exceeds 10 m [33 ft], use a 1.25 mm
calculation of the maximum length and overall length.
2 MA Remote controller
• Max length via outdoor unit (M-NET cable): L
• Max transmission cable length (M-NET cable): L
• Remote controller cable length: m
CONDUIT PLATE : accessory
2 [AWG20 to AWG16]
Use the most recent address within the same group of indoor units
Use an address, other than that of the IC (Main) from among the units within the same group of indoor units. This must be in
sequence with the IC (Main)
Use the most recent address of all the indoor units plus 50
* The address automatically becomes "100" if it is set as "01 - 50".
Set at an IC (Main) address within the same group plus 100
Set at an IC (Main) address within the same group plus 150
Unnecessary address setting (Necessary main/sub setting)
+L +L and L +L +L +L and L +L
2 3 4 1 2 3 5 1
and L +L and L +L and L and L
1 3 4 3 5 6 2
ℓ ℓ ℓ ℓ
, , + , 10 m [33 ft] (0.5 to 1.25 mm
1 2 2 3 4
+L +L +L and L +L +L
1 2 3 4 1 2
and L +L and L and L
1 3 4 6
and m +m +m and m +m +m +m
1 1 2 3 1 2 3
6.2. Control box and connecting position of wiring
(Fig. 6-1)
1. Connect the indoor unit transmission line to transmission terminal block (TB3), or
connect the wiring between outdoor units or the wiring with the centralized control
system to the centralized control terminal block (TB7).
When using shielded wiring, connect shield ground of the indoor unit transmission
line to the earth screw (
units and the central control system transmission line to the shield (S) terminal of
the centralized control terminal block (TB7) shield (S) terminal. In addition, 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 centralized control
system should also be connected to the ground (
2. Conduit mounting plates (ø27 [1-1/16 inch]) are being provided. Pass the power
supply and transmission 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).
3. MA Remote control cables
Kind of remote control cable
Cable diameter
2 Wiring examples
• Controller name, symbol and allowable number of controllers.
Name
Outdoor unit controller
Indoor unit controller
Remote controller
Setting Method
2
+L +L 500 m [1640 ft] (1.25 mm
2 6 7
+L and L 200 m [656 ft] (1.25 mm
6 7
2 [AWG20 to AWG16])
2
[AWG16] shielded wire. The length of this section (L
+L 500 m [1640 ft] (1.25 mm 2 [AWG16] or more)
6 7
+L and L 200 m [656 ft] (1.25 mm
2 6 7
2
200 m [656 ft] (0.3 to 1.25 mm [AWG20 to AWG16])
4
) and connect shield ground of the line between outdoor
).
2-core cable (unshielded)
2
0.3 mm (AWG22) to 1.25 mm
Symbol Allowable number of controllers
OC
IC One to eight controllers for one OC
RC Maximum of 16 controllers for one OC
(M-NET)
MA Maximum of two per group
) in the electrical component box.
[AWG16] or more)
2 [AWG16] or more)
) should be included in the
8
2 [AWG16] or more)
2
(AWG16)
9