Lennox VRF VMDB Series Installation Instruction page 15

Indoor units and mode selection boxes on the same
refrigeration circuit should have a common power
supply but must have an independent disconnect switch
installed adjacent to each item of equipment for servicing
208/230V 1Ph 60Hz
Power supply
L1 L2
L1 L2
Dedicated
breaker
L1 L2 L3
L1 L2 L3
Mode Selection Box
L1 L2
Service
Disconnect
Fuse
Figure 21. Typical Power Wiring Diagram (VRF Heat Recovery System Shown)
208/230V 3Ph 60Hz
or 460V 3Ph 60Hz
Power supply
L1 L2 L3
Outdoor Unit (Main Unit)
Service
Disconnect
L1 L2 L3
Indoor unit
Service
L1 L2
Disconnect
Fuse
and maintenance purposes. Indoor unit and mode
selection box power supply MUST not be taken from the
outdoor unit. Always follow NEC/CEC and Local Codes.
Outdoor Unit (Sub1 unit)
L1 L2 L3
L1 L2 L3
Service
Disconnect
L1 L2 L3
Indoor unit
Service
L1 L2
Disconnect
Fuse
15
Outdoor Unit(Sub2 Unit)
L1 L2 L3
L1 L2 L3
Service
Disconnect
L1 L2 L3
Indoor unit
L1 L2
Service
Disconnect
Fuse