Lennox S40 Installation And Setup Guide

10
• Set LVCS cycle time to one hour.
• Set ventilation time to 60 minutes.
Lennox Communicating
Indoor Unit
NOTE: Pass the blower motor L1 wire through the current loop on the current sensing relay as illustrated.
When there is a heating, cooling or continous fan call, the ventilation
controller will open the outdoor air damper to ventilate if the
outdoor temperature and indoor humidity are within the limits of the
ventilation controller.
NOTE: Set the communicating thermostat fan mode operation to Circulate and adjust duration to match control ventilation time duration.
26L56
CURRENT SENSING
RELAY
120VAC COIL RELAY
24VAC LVCS
DAMPER TRANSFORMER
VENTILATION
DAMPER
OUTDOOR
TEMPERATURE
SENSOR
NEUTRAL
EAC/ACC 120VAC
Thermostat
Lennox Ventilation Control System (LVC)
(See Lennox
Communication
Wiring Diagram)
Figure 10. Lennox S40, Lennox Ventilation Control System (LVCS), Current Sensing Relay, 120VAC Coil Relay, Damper Transformer, Ventilation
Dampers and Communicating Indoor Unit (using Non-Communicating Terminals)

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