Lennox S40 Installation And Setup Guide

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Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Ventilation Rate for
Low Speed
(Only listed for
2-speed ERV or HR
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 Outdoor
Condition Override
Options are Disabled (default) or Enabled.
ASHRAE
Compliance Check
= NO (Ventilation CFM too low to comply with ASHRAE 62.2) or =
YES (Current settings comply with ASHRAE 62.2)
ASHRAE Inltration
Credit
Parameter range is 0.0 - 200.0 CFM. Default is 0 CFM. Can be
adjusted in increments of 1.0 CFM.
ASHRAE House
Floor Area Serviced
by This Ventilator
Parameter range is 500.0 - 5000.0 square feet. Default is 2500.0
CFM. Can be adjusted in increments of 100.0 square feet. The
formula for calculating how much ventilation is required is:
(Total square footage of the home/100) + (number of bed-
rooms+1) x 7.5 cfm
ASHRAE Number of
Bedrooms
Parameter range is 1.0 - 10.0. Default is 3.0. Can be adjusted in
increments of 1.0.
Fresh Air Damper
Ventilation CFM
Parameter range is 20 - 250 CFM. Default is 75 CFM. Can be
adjusted in increments of 1.0.CFM
Ventilation Outdoor Condition Override - Enabled
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.
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
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
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.
Wall Insulation Options are poor, average and good. Default is average.
Wide Setpoint
Options are ON and OFF. Default is OFF. This allows a wider low
and high temperature. Normal range is 60 to 90°F (15.6 to 32.2°C)
. When this parameter is set to ON, the range is 40 to 100°F (4.4
to 37.8°C). This feature can also be set through the user interface
setting screen. From the home screen go to menu > settings > heat
& cool (or it may be just heat or cool) > wider set-point range.
Zone 1 through
4 First Stage
Differential
Differential is the temperature between when rst stage will cycle ON
and cycle OFF. (Example: Zone 1 Thermostat is set at 70°F (21°C)
with a 1.0°F (0.56°C) differential. Cooling Demand - cooling will cycle
ON when the room temperature reaches 70.5°F (21.4°C) and cycle
OFF when the room temperature is 69.5°F (20.8°C).
Range is 0.5 to 3°F (0.28 to 1.67°C). Default is 1°F (0.56°C).
Adjustments are in increments of 1°F (0.56°C).
NOTE: For Lennox variable capacity outdoor units the differentials
are ignored.
Zone 1 through
4 Continuous
Blower CFM
Minimum and maximum CFM will be dependent on system
component congurations. These parameter values are automatically
adjusted to the specic hardware conguration. See Lennox Smart
Zoning system installation instruction for minimum CFMs for specic
indoor units.
Zones requesting the fan ON are only allowed while no other zone
demand is present. The thermostat will sum all the zone continuous
blower CFM requirements and send the command only after
positioning the dampers and waiting for the damper close delay
period to expire (30 seconds) Continuous blower demands are the
lowest priority demands, all other conditioning demands will over-ride
the continuous blower demand.
Range is 5 CFM to maximum of indoor unit. Default is dependent on
tonnage of indoor unit. Adjustments are in increments of 5 CFM.
Zone 1 through 4
Cooling CFM
Minimum and maximum CFM will be dependent on system
component congurations. These parameter values are automatically
adjusted to the specic hardware conguration. See Lennox Smart
Zoning system installation instruction for minimum CFMs for specic
indoor units.
Target cooling CFM for a specic zone. Range is 5 CFM to maximum
of indoor unit. Default is dependent on tonnage of indoor unit.
Adjustments are in increments of 5 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