Lennox S40 Installation And Setup Guide

24
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Gas Heat Control
Mode
(SLP98V only)
Options are Staged, Load Tracking Variable Capacity and Variable
Capacity. Default is Load Tracking Variable Capacity
Staged: Some furnaces can be congured to provide up to four
stages of gas heat operation. When staged heating is chosen, the
S40 thermostat allows you to choose between 1, 2, 3 and 4 stages of
heat. Single-stage heat: rst stage provides 100% of full capacity.
• Two-stage heat: First stage provides 70% of full capacity; 2nd
stage provides 100% of full capacity.
• Three-stage heat: First stage provides 60% of full capacity; 2nd
stage provides 80% of full capacity; third stage provides 100% of
full capacity.
• Four-stage heat: First stage provides 35 or 40% of full capacity;
second stage provides 60% of full capacity; third stage provides
80% of full capacity; fourth stage provides 100% of full capacity.
Load Tracking Variable Capacity: Load tracking variable capacity
will smoothly track the load (sensible temperature changes) up and
down and adjust the furnace heating rate both ways.
Variable Capacity: Variable capacity only tracks the load upward
(rising temperature). Variable capacity uses the thermostat stage
differentials but not stage timers.
Gas Heating
Activation Temp
Difference
(Lennox Variable
Capacity Heat Pumps)
When the system is dual-fuel and steady state while operating at full
HP demand, this is the amount of °F (°C) below the set point that is
allowed before allowing to switch to gas heat.
Range is 0.5 to 10°F (0.0 to -5.56°C). Default is 1.5°F (1.30°C).
Adjustments are in increments of 0.5°F (0.14°C).
Heat Cool Stages Locked In
Heat Cool (H/C) Stages Lock in default is disabled (heat/cool stages are turned off separately).
If changed to Enabled, heat/cool stages are turned off together. For non-variable capacity
systems only. See “Table 6. Thermostat Parameters - Heat Cool Stages Locked In” on page
30 for graphics.
Group ID
Multiple thermostats in a home can be assigned to a group (up
to nine groups with up to ve thermostats in each group). All
thermostats in a group can communicate with other thermostats in
the same group over the home Wi-Fi network.
If a thermostat is set to Group ID 0, there will be no connectivity with
another thermostat.
Default Group ID is 1. Valid range is 0 to 9. (Recommend no more
than 5 thermostats per group. Doing so will eliminate possible Wi-Fi
bandwidth issues.)
HP Heating
Lockout Time
The HP could not get a zone to progress 0.5 degrees towards the
set point in 120 minutes (Alert Code 40 - Minor alert). System will
switch to secondary heat source. (Electric heat or furnace in dual fuel
applications). Transition back to Heat Pump normal operation when
termination setting times out.
Range is 60 to 240 minutes. Default is 60 minutes. Adjustments are
in increments of 30 minutes.
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
HP Heating
Mode
(Lennox Variable
Capacity Heat Pumps)
Options are Normal and Comfort. Default is Normal. The normal
setting heats the home to the desired temperature setting. Modify the
heating comfort mode to limit minimum compressor speed to 60 – 70
percent range and/or adjust comfort mode CFM.
• Normal is when the heat pump will heat the home will providing
the highest efciency.
• Comfort is when the heat pump will deliver warmer air for comfort,
but sacrices on efciency.
Humiditrol Comfort
Adjust
Options are Maximum Overcooling, Midpoint Overcooling and
Minimum Overcooling. Default is Maximum Overcooling.
• Maximum Overcooling: Indoor temperature > (greater than) two
degrees above heating set point.
• Midpoint Overcooling: Indoor temperature > (greater than) HEAT
set point + COOL set point / 2.
• Minimum Overcooling: Indoor temperature > (greater than) two
degrees below cooling set point.
NOTE: Lennox variable capacity outdoor units are not compatible
with Humiditrol (EDA).
Humidity Reading
Calibration
If it is determine that the actual humidity percentage being detected
at the thermostat is off based on independent readings using other
humidity reading devices, the display can be adjusted using this
setting.
Range is -10.0 to 10.0%. Default is 0.0%.
IAQ Cleaning
CFM
Range is 250.0 to 1550.0 CFM. Default is 250.0 CFM and adjustable
in 10CFM increments. This is the CFM adjustment when the system
is in cleaning mode.
Lock In 2nd
Stage HP by
Outdoor Temp
(Lennox Two-Stage
Communicating
Heat Pumps Only)
This accessory allows the unit to lock in second stage HP heating
when the outdoor temperature goes below the jumper pin setting.
Options are off, 40°F (4°C), 45°F (7°C), 50°F (10°C) and 55°F (13°C).
Default is off.
Max Heat
Setpoint
The highest temperature setting that the heat set point can be set on
the thermostat. Default is 90.0F (32.33°C). Range is 60.0 to 90.0°F
(15.56 to 32.22°C). Adjustable in increments of 1°F (0.56°C).
Max Humidication
Setpoint
This setting will limit the highest humidication setting on the
thermostat. This parameter will only appear when a humidier
accessory is installed. Range is 15 to 45%. Default is 45%.
Adjustments are in increments of 1%.
Min Cool
Setpoint
This setting will limit the lowest cooling temperature setting on the
thermostat. Range is Range is 60.0 to 90.0°F (15.56 to 32.22°C).
Default is 60°F (15.56°C). Adjustments are in increments of 1°F
(0.56°C).

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