Lennox S40 Installation And Setup Guide

9
LENNOX
COMMUNICATING
FURNACE
48G96 Relay
GND
IN
120VAC<-------HUMIDIFIER CONNECTIONS------> 24VAC
OPTIONAL DISCHARGE
AIR SENSOR
(SEE DAS NOTES)
OPTIONAL OUTDOOR
AIR SENSOR (SEE OAS
NOTES)
ERV / HRV
24VAC UV Light Applications: In any Lennox communicating system, the indoor unit will
NOT have adequate power to to run the 24VAC UV light application. An additional transformer
will be required. UV light wiring connections are independent of the HVAC system operation
(refer to UV light installation instruction.
Humidity Control Applications: Lennox communicating thermostats can sense humdiity and controls
both 24VAC “H” and 120VAC “H” outputs to cycle humdifier based on demand. No other
control or humidistat is required. Optional outdoor air temperature sensor for use with humidifier
(if not already in the system for other function and are typically built into all Allied communicating
outdoor units
Thermostat
Lennox
Communicating
Outdoor Unit
Lennox Communicating
Furnace or Air Handler
Thermostat
DRAIN
WIRE
CONNECTS
TO C
(See Lennox
Communication
Wiring Diagram)
(See Lennox
Communication
Wiring Diagram)
(See Lennox
Communication
Wiring Diagram)
Figure 9. Lennox S40 with Humidier Accessory

Lennox S40 Specifications

General

Display	Color touchscreen
Voice Control	Amazon Alexa, Google Assistant
Energy Reports	Yes
Programming	7-day programmable
Warranty	5-year limited warranty
Connectivity	Wi-Fi
Compatibility	Lennox HVAC systems
Smart Features	Geofencing
Sensors	Temperature, Humidity