Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 40

1) Indoor/outdoor (heat source) transmission line
Daisy-chain terminals M1 and M2 on the terminal block for indoor-outdoor (heat source) transmission line (TB3) on
the outdoor (heat source) unit (OC), terminals M1 and M2 of the terminal block for indoor-outdoor (heat source)
transmission line (TB02) on the BC controller (BC and BS), and terminals M1 and M2 on the terminal block for in-
door-outdoor (heat source) transmission line (TB5) on each indoor unit (IC). (Non-polarized 2-core cable)
Only use shielded cables.
[Shielded cable connection]
Same as [4] 1.
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block for centralized control transmission line (TB7). Disconnect
the male connector on the controller board from the female power supply switch connector (CN41), and connect it
to the female power supply switch connector (CN40).
Only use shielded cables.
[Shielded cable connection]
To ground the shielded cable, daisy-chain the S-terminals on the terminal block (TB7) on each of the outdoor (heat
source) units. Connect the S (shielded) terminal on the terminal block (TB7) on the outdoor (heat source) unit whose
CN41 was replaced with CN40 to the ground terminal ( ) on the electric box.
3) MA remote controller wiring
Same as [4] 1.
[When 2 remote controllers are connected to the system]
Same as [4] 1.
[Group operation of indoor units]
Same as [4] 1.
4) LOSSNAY connection
Same as [4] 2.
5) Switch setting
Address setting is required as shown on the next page.
Wiring method
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[ II Restrictions ]