Mitsubishi Electric CITY MULTI PUHY-P-TKMU-A Manuel D'installation page 22

<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, OS-OS and IC-IC wiring
intervals.
b. Use feed wiring to connect terminals M1 and M2 and the ground terminal
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 of only
one outdoor unit in the system (except TKMU model). When the System controller is connected to TB7 side and TKMU outdoor unit model is used, connect a PAC-
SC51KUA to TB7 side. If a PAC-SC51KUA cannot be used, connect the System controller to TB3 side. Up to three System controllers can be connected to TB3 side.
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 ground terminal
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.
Unit
Indoor unit (Main)
Indoor unit (Sub)
Outdoor Unit (OC, OS)
M-NET R/C (Main)
M-NET R/C (Sub)
MA R/C
*1 OC, OS1 and OS2 of the outdoor units in the same refrigerant system are automatically identified. They are identified as OC, OS1 and OS2 in descending order of
capacity. (If the capacity is the same, they are identified in the ascending order of their address number.)
*2 When a PAR-30MAAU is connected to a group, no other MA remote controllers can be connected to the same group.
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.
i. When the centralized remote controller is connected to the system, set centralized control switches (SW5-1) on control boards in all outdoor units (OC, OS1 and
OS2) to "ON".
<Permissible Lengths>
1 M-NET Remote controller [Fig. 11..1]
• Max length via outdoor units: L +L +L
1 2
• Max transmission cable length: L and L
1
• Remote controller cable length: , ,
1 2
If the length exceeds 10 m [32 ft], use a 1.25 mm
calculation of the maximum length and overall length.
2 MA Remote controller [Fig. 11..]
• Max length via outdoor unit (M-NET cable): L
• Max transmission cable length (M-NET cable): L
• Remote controller cable length: m +m
1 2
3 Transmission booster [Fig. 11..]
• Max transmission cable length (M-NET cable): 1 L
• Remote controller cable length: , 10 m [32 ft] (0.3 to 1.25 mm
1 2
If the length exceeds 10 m [32 ft], use 1.25 mm
the total extended length and the longest remote length.

on the transmission line terminal block (TB3) of each outdoor unit (OC) to terminals M1,
in the electrical component box.
Range
01 to 50 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
01 to 50
units. This must be in sequence with the IC (Main)
Set the addresses of the outdoor units in the same refrigerant system in the order of sequential
51 to 100
number. OC, OS1 and OS2 are automatically identified. (*1)
101 to 150 Set at an IC (Main) address within the same group plus 100
151 to 200 Set at an IC (Main) address within the same group plus 150
– Unnecessary address setting (Necessary main/sub setting) (*2)
+L and L +L +L +L and L +L +L 500 m [1,640 ft] (1.25 mm
3 4 1 2 3 5 1 2 6
+L and L +L and L and L +L 200 m [656 ft] (1.25 mm
3 4 3 5 6 2 6
, 10 m [32 ft] (0.3 to 1.25 mm 2 [AWG 22 to 16])
3 4
+L +L +L and L +L +L 500 m [1,640 ft] (1.25 mm
1 2 3 4 1 2 6
and L +L and L and L +L 200 m [656 ft] (1.25 mm
1 3 4 6 2 6
and m +m +m +m 200 m [656 ft] (0.3 to 1.25 mm
1 2 3 4
+L +L +L +L 200 m [656 ft] (1.25 mm
1 2 3 5 6
+L +L +L +L 200 m [656 ft] (1.25 mm
2 L
1 2 3 5 7
+L +L 200 m [656 ft] (1.25 mm
3 L
1 2 4
+L +L +L , L +L +L +L 200 m [656 ft] (1.25 mm
4 L
6 5 3 4 4 3 5 7
[AWG 22 to 16])
2
Setting Method
[AWG 16] or more)
2
[AWG 16] or more)
2
[AWG 16] shielded wire. The length of this section (L
2
2 [AWG 16] or more)
[AWG 16] or more)
2
[AWG 22 to 16])
2
[AWG 16])
2
[AWG 16])
2
[AWG 16])
2
[AWG 16])
2
[AWG 16] shielded cable and calculate the length of that portion (L
2
) should be included in the
8
and L ) as within
4 7