Mitsubishi Electric CITY MULTI PQHY-P72-Z KMU-A Manuel D'installation page 28

Example of a group operation system with multiple heat source units (Shielding wires and address setting are
necessary.)
<Examples of transmission cable wiring>
[Fig. 11..1] [Fig. 11..] [Fig. 11..4] [Fig. 11..6] ME Remote Controller (P.1 - 14)
*1: For [Fig. 11.3.1] [Fig. 11.3.4]
When the power supply unit is not connected to the transmission line for centralized control, disconnect the male power supply connector (CN41) from ONE
heat source unit in the system and connect it to CN40.
*2: If a system controller is used, set SW5-1 on all of the heat source units to ON.
[Fig. 11..] [Fig. 11..] MA Remote Controller (P.1, 14)
<A> Change the jumper connector from CN41 to CN40
<B> SW5-1:ON
<C> Keep the jumper connector on CN41
Group 1
A B
[Fig. 11..] [Fig. 11..6] Combination of heat source units and transmission booster unit (P.1, 14)
• ( ) Address
• Daisy-chain terminals (TB3) on heat source units in the same refrigerant system together.
• Leave the power jumper connector on CN41 as it is. When connecting a system controller to the transmission line (TB7) for centralized control, refer to
[Fig. 11.3.1], [Fig. 11.3.2] or [Fig. 11.3.4], [Fig. 11.3.5] or DATA BOOK.
<Wiring Method and Address Settings>
a. Always use shielded wire when connecting the heat source 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
M1, 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 heat source 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 on only
one heat source unit in the system.
f. Connect the terminal S on the terminal block for central control (TB7) for the heat source unit (OC) for the unit into which the jumper connector was inserted into
CN40 in the step above to the earth terminal
g. Set the address setting switch as follows.
* To set the heat source unit address to 100, the heat source address setting switch must be set to 50.
Unit
Indoor unit (Main)
Indoor unit (Sub)
Heat source Unit (OC, OS)
BC controller (Main)
BC controller (Sub)
ME R/C (Main)
ME R/C (Sub)
MA R/C
h. Group setting operation among the multiple indoor units is performed by the remote controller (RC) after the 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 heat source units (OC, OS1, and
OS2) to "ON".
*1 OC, OS1, and OS2 of the heat source 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).
8
Group 3 C Group 5
in the electrical component box.
Range
01 to 50 Use the most recent address within the same group of indoor units. With an R2 system with sub BC
controllers, set the indoor unit address in the following order:
1 Indoor units connected to the main BC controller
2 Indoor units connected to BC sub controller 1
3 Indoor units connected to BC sub controller 2
Set the indoor unit addresses so that all the addresses of 1 are smaller than those of 2, and that all
the addresses of 2 are smaller than those of 3.
01 to 50 Use an address, other than that of the IC (Main) from the units within the same group of indoor units.
This must be in sequence with the IC (Main)
51 to 100 Set the addresses of the heat source units in the same refrigerant system in the order of sequence.
OC, OS1, and OS2 are automatically identified. (*1)
51 to 100 Heat source unit address plus 1. When the set indoor unit address duplicates the address of another
indoor unit, set the new address to a vacant address within the set range.
51 to 100 Lowest address within the indoor units connected to the BC controller (sub) plus 50
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)
Shielded wire Sub remote controller
D E
on the transmission line terminal block (TB3) of each heat source unit (OC) to terminals
Setting Method
( ) Address