Lennox S40 Installation And Setup Guide

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Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Min
Dehumidication
Setpoint
This setting will limit the lowest dehumidication setting on the
thermostat. Range is 40 to 60%. Default is 40%. Adjustments are in
increments of 1%.
Minimum Gas
Heating Off Time
Range is 2.5 to 10 minutes. Default is 1.5 minutes. Adjustable in
increments of .5 minutes.
Modulating
Cooling Cycles
Per Hour
(Lennox Variable
Capacity Outdoor
Units)
This feature is activated when the structure BTU load is less than
the minimum outdoor unit cooling capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour
to maintain the settings of the thermostat. (This governs how many
cycles per hour the system will try to run when it needs to run at less
than minimum capacity).
Range is 3 to 6 cycles hours. Can be adjusted in increments of 0.5.
Default is 4.
Understanding Modulating Step Change and Steady State PI Gains
Each of these terms has a multiplier (or gain) associated with it called the proportional gain
and the integral gain respectively and affect responsiveness and stability
• Standard is a moderate gain suitable for nearly all installations.
• More Aggressive is a set of slightly higher gains that will make the system more responsive
to changes, and will try harder to stay on the set point. This setting may cause some systems
to oscillate.
• Less Aggressive is a set of slightly lower gains that will make the system less responsive
and help to stabilize an oscillating system by sacricing a small amount of time to set point.
None of the above options will cause the system to end a call if the demand for heating or
cooling remains above the minimum capacity of the system since the algorithm is designed to
nd the demand that allows the system capacity to exactly match the house heating or cooling
loss, creating a balance and constant temperature.
Modulating
Cooling Step
Change PI Gain
(Lennox Variable
Capacity Outdoor
Units)
Step change gains deal with set point changes and affects how fast
the system reaches the next set point.
Options are less aggressive, standard and more aggressive.
Default is standard.
Modulating
Cooling Steady
State PI Gain
(Lennox Variable
Capacity Outdoor
Units)
Steady state gain controls the demand when the system is not
responding to a sensed temperature change away from the S40
thermostat setting.
Options are less aggressive, standard and more aggressive.
Default is standard.
Modulating Gas
Heating Cycles
Per Hour
(SLP98V only)
This feature is activated when the structure BTU load is less than
the minimum Heat Pump heating capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour
to maintain the settings of the S40
thermostat. (This governs how
many cycles per hour the system will try to run when it needs to run
at less than minimum capacity.
Range is 4 to 10 cycles. Default is 6 cycles. Adjustments are in
increments of 0.5 cycles.
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Modulating Gas
Heating Step
Change PI Gain
(SLP98V only)
This is applicable to the SLP98V only. Step change gains deal with
set point changes and affects how fast the system reaches the next
set point (Example: Adjustment to the thermostat setting).
Options are less aggressive, standard and more aggressive.
Default is standard. Recommend not changing this setting.
Modulating HP
Heating Cycles
Per Hour
(Lennox Variable
Capacity Heat Pumps)
This feature is activated when the structure BTU load is less than
the minimum Heat Pump heating capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour
to maintain the settings of the thermostat. (This governs how many
cycles per hour the system will try to run when it needs to run at less
than minimum capacity).
Range is 3 to 6 cycles. Default is four cycles. Adjustments are in
increments of 0.5 cycles.
Modulating HP
Heating Step
Change PI Gain
(Lennox Variable
Capacity Heat Pumps)
Step change gains deal with set point changes and affects how fast
the system reaches the next set point (Example: Schedule change or
adjustment to the thermostat setting).
Options are less aggressive, standard and more aggressive.
Default is standard. Recommend not changing this setting.
Modulating HP
Heating Steady
State PI Gain
(Lennox Variable
Capacity Heat Pumps)
Steady state gain controls the demand when the system is not
responding to a sensed temperature change away from the
thermostat setting.
Options are less aggressive, standard and more aggressive.
Default is standard. Recommend not changing this setting.
Number of Gas
Heating Stages
(SLP98V only)
Number of selectable stages when Gas Heat Control Mode is set in
“Staged” mode.
Options are 1 through 4. Default is 4.
Outdoor
Temperature
Reading
Calibration
This will allow for adjustment to the outdoor temperature display
when the display temperature is off. Outdoor sensor is required.
Range is -10 to 10°F (-5.56 to 5.56°C). Default is 0°F (0.0°C).
Adjustments are in increments of 1°F. (0.56°C)
Outdoor
Temperature
Source
Options are off, Internet (AccuWeather
®
) or sensor. Default is Internet
(AccuWeather
®
).
Preferred Filter
Test Window
Start Time
Range is 0.0 to 230 hours. Default is 12 hours and increment is 10ºF.
Proximity
Control
Options are ON and OFF. Default is OFF. Is used to wake-up the
display from screen saver mode when motion near the Thermostat is
detected.
Reset
thermostat
Reset thermostat (erases thermostat settings and restarts installer
setup).
Screen Locked
Options are unlocked, partially locked and locked. Default is
unlocked.

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