Lennox iComfort S30 Installation And Setup Manual page 9

Outdoor Unit Indoor Unit Controller
Smart Hub
Mag-Mount
12VDC COM BUS
+ -
R i+ I- C
A B
Single wire
12VDC A B
Single wire
COM BUS
+ -
to bundle
to indoor unit
wire to indoor
terminal "C".
Single wire
terminal "C".
to terminal "C".
Unused wires
Unused wires
Unused wires
Figure 4. Thermostat Wire Termination in Communicating Systems (Electrical Noise)
Indoor Unit Controller
PureAir S
Single wire
to terminal "C".
Unused wires
Figure 5. Thermostat Wire Termination in Communicating Systems (Electrical Noise) - Optional PureAir S
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