Lennox VOSB Series Installation Instructions Manual page 14

1. Remove the screws that secure the control box cover.
Remove the cover and place it to the side where it will
not be damaged.
2. Locate the terminal strip in the control box. Connect
the power wiring (sized per NEC/CEC and local codes)
and communications cable (two-conductor shielded
cable). Refer to unit nameplate for rated voltage.
3. If the indoor unit is the final unit in a group that is wired
in series, install the provided resistor across terminals
P and Q.
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 15. 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
L1 L2 Service
Disconnect
Fuse
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
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
L1 L2 Service
Disconnect
Fuse
14
Outdoor Unit(Sub2 Unit)
L1 L2 L3
L1 L2 L3
Service
Disconnect
L1 L2 L3
Indoor unit
L1 L2
Service
Disconnect
Fuse