Lennox S40 Installation And Setup Guide

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Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Ventilation Control Mode - timed (default)
Ventilation Minutes
Per Hour
Parameter range is 0.0 - 60.0 minutes. Default is 20.0 minutes. Can
be adjusted in increments of 1.0 minutes.
• The system rst tries to satisfy the ventilation time by only ventilating
while conditioning is occurring. NOTE: Continuous fan is NOT
considered conditioning.
• When the required time remaining to ventilate for the hour does not
equals the amount of time remaining in that hour, the system begins
ventilation and does not stop until the ventilation time requirement
is satised.
• When ventilating without a conditioning demand, the ventilation
output is active as well as a continuous indoor fan demand.
• When ventilating with a conditioning demand, the ventilation output
is active with the conditioning demand outputs.
Ventilation Rates
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up
is completed and the CFMs are known. Once the thermostat’s CFMs are adjusted they are
used with the thermostat’s timer algorithm to determine how long to run the HRV/ERV and to
change from low to high speed if a 2-stage HRV/ERVs.
Ventilation Rate
(Only listed for
1-speed ERV or
HRV)
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be
adjusted in increments of 1.0 CFM.
Ventilation Rate for
Low Speed
(Only listed for
2-speed ERV or HRV
Parameter range is 10 - 200 CFM. Default is 50 CFM. Can be
adjusted in increments of 1.0 CFM.
Ventilation Rate for
High Speed
(Only listed for
2-speed ERV or HRV
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be
adjusted in increments of 1.0 CFM.
Ventilation
High Outdoor
Temperature Limit
Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in
increments of 5ºF.
While the outdoor temperature is equal to or higher than the setting
for Ventilation High Outdoor Temperature Limit, ventilation does
not run. When locked out due to high outdoor temperature, it will
become unlocked when either the outdoor temperature is missing,
or when the temperature reported is 1°F less than the Ventilation
High Outdoor Temperature Limit setting when display units are in
Fahrenheit, or is reported as 0.5°C less than lock out setting when
the display units are Celsius.
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Ventilation
Low Outdoor
Temperature Limit
Parameter range is -20 to 55ºF. Default is 0ºF. Can be adjusted in
increments of 5ºF.
While the outdoor temperature is lower than the setting for the
Ventilation Low Outdoor Temperature Limit, ventilation does
not run. When locked out due to low outdoor temperature, it will
become unlocked when the outdoor temperature is missing, or
when the temperature reported is 1°F higher than the Ventilation
Low Outdoor Temperature Limit setting when display units are
Fahrenheit, or is reported as 0.5°C higher than lock out setting when
the display units are Celsius
Ventilation High
Outdoor Dew Point
Limit
Parameter range is 45 to 80ºF. Default is 55ºF. Can be adjusted in
increments of 5ºF.
While the outdoor dew point is higher than the setting for the high
outdoor dew point limit, ventilation does not run. When locked out
due to high outdoor dew point limit, it will become unlocked when
the outdoor dew point is missing, or when the dew point temperature
reported is 1°F less than the lock out setting when display units are
Fahrenheit, or is reported as 0.5°C less than lock out setting when
the display units are Celsius.
Ventilation Control Mode - ASHRAE
• In this mode the thermostat can assist the installer by validating the ventilation CFMs are
capable of meeting the ASHRAE required ventilation volumes, but the thermostat has no
ability to control CFM from the HRV/ERV.
• The system rst tries to satisfy the ventilation volume by only ventilating while conditioning is
occurring. Continuous fan is not considered conditioning.
• The total volume of ventilation air is accumulated and stored to compare against the target
hourly ventilation volume (Vhr). The accumulated value resets each hour.
• When the remaining required volume of ventilation air for the hour divided by the fan only
ventilation rate is equal to or greater than the time remaining to ventilate for the hour and no
conditioning is occurring, the system begins ventilation using continuous fan and does not
stop until the target hourly ventilation volume requirement is satised.
• When ventilating without a conditioning demand, the ventilation output is active as well a
continuous indoor fan demand.
• When ventilating with a conditioning demand, the ventilation output is active with the
conditioning demand outputs.
• When the system is ventilating, the user interface can indicate as such by showing “ventilating”
to the user on the home screen.
Ventilation Rates
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up
is completed and the CFMs are known. Once the thermostat’s CFMs are adjusted they are
used with the thermostat’s timer algorithm to determine how long to run the HRV/ERV and to
change from low to high speed if a 2-stage HRV/ERVs.
Ventilation Rate
(Only listed for
1-speed ERV or HRV
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be
adjusted in increments of 1.0 CFM.

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