Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 44

1) Indoor/outdoor (heat source) transmission line
Same as [4] 3.
[Shielded cable connection]
Same as [4] 1.
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on each out-
door (heat source) unit (OC). 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) on only one of the out-
door (heat source) units (OC). Set the central control switch (SW2-1) on the controller board on all OC to ON.
Only use shielded cables.
[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 unit (IC) to the appropriate terminals on the
terminal block for indoor-outdoor (heat source) transmission line (TB5) on LOSSNAY (LC). (Non-polarized 2-core ca-
ble)
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 or the LM adapter alone is connected.
5) Switch setting
Address setting is required as shown on the next page.
Wiring method
- 35 -
[ II Restrictions ]