Smart Hub; Installation; Antennas; Wire Connections - Lennox iComfort S30 Smart Thermostat Operating, Troubleshooting And Technical Cheat Sheet

1. Smart Hub

1.1. Installation

DO NOT install the Smart Hub on indoor unit, duct work or any equipment that could induce vibration.
Mount Smart Hub on flat surface away from indoor unit to minimize vibration. Securing module to a wall stud is desir­
able. If mounted on metal surface other than above, antennas need to be perpendicular to the metal surface.

1.2. Antennas

Unfold both antennas to the vertical position. Adjustments may be required to optimized transmitting and receiving.

1.3. Wire Connections

1.3.1. Wire gauge and Maximum Run Length:
The Smart Hub connects to the indoor unit through common four-conductor thermostat wire. It receives 24VAC
power from the indoor unit over two wires and communicates with the indoor unit and the rest of the HVAC
system through two different wires. Wiring from the Smart Hub to the indoor unit should be limited to 300 feet or
less (for 18 AWG wire).
1.3.2. Smart Hub to Mag-Mount Terminal Connections
Type
RS-485
24VAC
Power
1.3.3. Smart Hub to Indoor Unit Terminal Connections
Type
RS-BUS
24VAC
Power
Smart Hub Mag-Mount
Terminal Terminal
Labels Labels
+ +
- -
A A
B
B
Smart Hub Indoor Unit
Terminal Terminal
Labels Labels
I+ I+
i- i-
R R
C C
Terminal Color Function
Yellow
Two wire serial RS-485 interface,
3.3V signaling up to 400 feet.
Green
Blue 24VAC RS-bus power input
Black 24VAC RS-bus common input
Terminal Color Function
Yellow
RS-bus high – data line 1
RS-bus high – data line 2
Green
Red 24VAC RS-bus power input
Black 24VAC RS-bus common input
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