Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 52

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), terminals M1 and M2 on the terminal block
for indoor-outdoor (heat source) transmission line (TB5) on each indoor unit (IC), and terminals M1 and M2 on
the system controller. (Non-polarized 2-core cable)
Only use shielded cables.
[Shielded cable connection]
To ground the shielded cable, daisy-chain the ground terminal on the outdoor (heat source) unit and on the ter-
minal block (TB1) on the BC and BC, the S terminal on the terminal block (TB5) on the indoor unit, and the S
terminal on the system controller.
2) Transmission line for centralized control
Same as [4] 4.
[Shielded cable connection]
Same as [4] 3.
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
Connect terminals M1 and M2 on the terminal block (TB5) on the indoor units (IC) to the appropriate terminals
on the terminal block for indoor-outdoor (heat source) transmission line (TB5) on LOSSNAY (LC). (Non-polar-
ized 2-core cable)
Indoor units must be interlocked with the LOSSNAY unit using the system controller. (Refer to the operation
manual for the system controller for the setting method.) Interlock setting from the remote controller is required
if the ON/OFF remote controller alone is connected.
5) Switch setting
Address setting is required as shown on the next page.
Wiring method
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[ II Restrictions ]