It is possible to replace a Lennox iComfort s30 with an ecobee smart thermostat premium on a Lennox SL280UHV, but it will take a little rewiring.
My iComfort s30 thermostat smart hub slowly died after a power outage. I couldn't find a replacement part in stock, and the new upgraded hub would cost between $500 and $1200.
The good news is that I was able to replace the iComfort s30 with an ecobee premium model. I selected the premium model because it was on sale and would work well with my whole house humidifier.
Because the iComfort s30 and my outdoor unit were both communicating devices, I had to move wires from the 4-wire (R, I+, I-, C) terminals to the more standard non-communicating terminals (W1, W2, Y1, G, C, R, etc.) on both the inside furnace control board and the outside unit control board.
I used the ACC+ terminal on the ecobee to control the AprilAire 600 Whole-House Large Bypass Humidifier. It's a one-wire solenoid setup. I removed the HUM connections from the control board and joined the red humidifier wire to the black ACC+ wire. The C connection stayed the same.
⚠ Always disconnect power to your HVAC before opening any part of it. You could accidentally short a wire and damage the system or shock yourself.
 |
| ecobee wiring setup |
Original indoor unit wiring:
 |
| Original Lennox SL280UHV wiring |
On the indoor control board, I moved the red, yellow, green, and blue wires to the terminals that matched up with the ecobee wiring terminals. Fortunately, I had three additional wires already in the bundle to connect the rest.
For the outdoor unit, I moved the yellow wire from I- to Y1 on both the furnace and outdoor unit control boards. I left the green wire disconnected from both. (not pictured)
Final wiring for indoor unit:
 |
| Final wiring for ecobee with humidifier |
The disconnected green wire on the left runs to the outdoor unit and is no longer used.
Red and black wires with the blue cap connect the ecobee ACC+ terminal to the humidifier.
W1, W2, G, Y1, C, R all run to the ecobee thermostat.
Y1, C, R run to the outdoor unit. If you have a communicating system, make sure to move the yellow wire to Y1 on the outdoor control board.
⚠ Always disconnect power to your HVAC before opening any part of it. You could accidentally short a wire and damage the system or shock yourself.
Comments