Mitsubishi Electric CITY MULTI PUHY-P-TJMU-A Manuel D'installation page 17

<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
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.
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 Range
Indoor unit (Main) 01 to 50
Indoor unit (Sub) 01 to 50
Outdoor Unit (OC, OS) 51 to 100
M-NET R/C (Main) 101 to 150
M-NET R/C (Sub) 151 to 200
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.)
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 (SW2-1) on control boards in all outdoor units (OC, OS1 and OS2)
to "ON".
<Permissible Lengths>
1 M-NET Remote controller [Fig. 11.3.1]
• Max length via outdoor units: L +L
1
• Max transmission cable length: L
1
Remote controller cable length: r
•
1
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. 11.3.2]
• Max length via outdoor unit (M-NET cable): L
• Max transmission cable length (M-NET cable): L
Remote controller cable length: c
•
1
3 Transmission booster [Fig. 11.3.3]
Max transmission cable length (M-NET cable): 1 L
•
Remote controller cable length: r
•
1
If the length exceeds 10 m [32 ft], use 1.25 mm
the total extended length and the longest remote length.
in the electrical component box.
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)
Set the addresses of the outdoor units in the same refrigerant system in the order of sequential number. OC, OS1 and OS2
are automatically identified. (*1)
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 +L
2 3 4 1 2 3 5 1 2
and L +L and L +L and L and L +L
3 4 3 5 6 2 6
, r , r , r
10 m [32 ft] (0.3 to 1.25 mm
=
2 3 4
+L +L +L and L +L +L =
1 2 3 4 1 2 6
and L +L and L and L
1 3 4 6
and c
+c +c +c +c 200 m [656 ft] (0.3 to 1.25 mm
=
2 1 2 3 4
+L +L +L +L 200 m [656 ft] (1.25 mm
=
1 2 3 5 6
2 L
+L +L +L +L 200 m [656 ft] (1.25 mm
=
1 2 3 5 7
3 L
+L +L 200 m [656 ft] (1.25 mm
=
1 2 4
4 L
+L +L +L , L +L +L
6 5 3 4 4 3 5
, r
10 m [32 ft] (0.3 to 1.25 mm 2 [AWG 22 to 16])
=
2
on the transmission line terminal block (TB3) of each outdoor unit (OC) to terminals M1, M2
Setting Method
2
500 m [1,640 ft] (1.25 mm [AWG 16] or more)
=
6
2
200 m [656 ft] (1.25 mm [AWG 16] or more)
=
2 [AWG 22 to 16])
2
[AWG 16] shielded wire. The length of this section (L
2
500 m [1,640 ft] (1.25 mm [AWG 16] or more)
2
+L 200 m [656 ft] (1.25 mm [AWG 16] or more)
=
2 6
2 [AWG 22 to 16])
2 [AWG 16])
2 [AWG 16])
2
[AWG 16])
2
+L 200 m [656 ft] (1.25 mm [AWG 16])
=
7
2
[AWG 16] shielded cable and calculate the length of that portion (L
) should be included in the
8
and L ) as within
4 7
17