Lennox S40 Installation And Setup Guide

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Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Auto
Dehumidication
Overcooling
Threshold
Adjustments are in increments of 1%. This value can automatically be
affected by adjusting other parameters. One example would be when
enabling Max Dehumidication Overcooling.
Range is 0 - 10%. Default is 4%.
Aux Heating
Activation
Threshold
This is an adjustment to hasten or delay the aux heat activation. This
adjusts how far below the set point the temperature must fall with the
HP at 100% before allowing electric heat to come on.
Range is 0 - 10°F (0.0 to 5.56°C) with increments of 0.25°F (0.14°C).
The default setting is 2.5°F (0.83°C).
Denition/Dependencies:
Step Change versus Steady State Modes
• Outdoor temperature below the high balance point or with balance
points disabled.
• Heat Pump demand above 95% for 10 minutes.
• Sixty (60) minute temperature rise prediction = less than this
Parameter Setting (value)
Result:
The Heating Proportional Integral Algorithm (as set for less, normal,
or more aggressive) will begin to stage on the electric heat to bring
the space temperature up to set point.
Synopsis: The lower this parameter is set, the quicker the auxiliary
heating will respond, in both step change mode and steady state
mode.
Balance Point Control
If system is set up as dual fuel or heat pump with electric heat and a outdoor temperature
sensor connected to thermostat, the low and high balance point settings will appear. The
balance points feature requires that a sensed outdoor temperature is provided to the
thermostat. The outdoor ambient temperature can be read from either a:
• Field-installed outdoor temperature sensor (X2658).
• Communicating heat pump. All communicating heat pumps have a factory-installed outdoor
temperature sensor.
Options are enabled or disabled. Default is disabled. When enabled, both low and high
balance points can be set.
High Balance Point
This setting is used to prevent the furnace or electric heat from
heating the structure. (Alert 19 - Minor - Notication only - The
outdoor temperature is higher than the level where the furnace or
electric heat is programmed to heat the home.)
Range is -17 to 75°F (-27.22 to 23.89°C). Default is 50°F (10.0°C).
Adjustments are in increments of 1°F (0.56°C).
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Low Balance Point
Setting used to prevent the heat pump from heating the structure.
(Alert 18 - Minor - Notication only - The outdoor temperature is
below the level where the heat pump is programmed to heat the
home).
Range is -20 to 72°F (-28.89 to 22.22°C). Default is 25°F (-3.89°C).
Adjustments are in increments of 1°F (0.56°C).
NOTE: Dual-Fuel Applications (Communicating Systems Only) -
Dual fuel applications, which include both a Heat Pump and
a gas furnace, will provide multiple stages of heating. For
example, a two−stage heat pump would deliver two stages
of heat. The gas furnace can add two to four more stages
of heat.
Brightness
Value
The brightness range is 0 - 100. Default 80. Touch either the + or -
button to increase or decrease the setting.
CFA Cooling
Discomfort
Threshold
Default is ON. The purpose of this algorithm when set to ON is to
detect systems with faults which are causing measurable loss of
comfort and thus, need repair/service intervention.
The algorithm monitors the duration in which the indoor temperature
is above the cool set point or below the heat set point and does
not approach the set-point. When an issue is detected alarm 901 is
activated.
Cooling Capacity
Alert
Options are ON or OFF. Default is ON. Cooling operation may not
be sufcient for the hottest days. Based on local conditions and
climatological data for zip code.
Examples: Dirty Filter, Low Refrigerant charge, TXV, etc. Symptom
during mild temperatures may include; system running longer than
normal but not showing any other symptoms.
Cooling Mode
Options are Normal and Comfort. Default is Normal. When changing
to Comfort Mode, several parameters are automatically modied for
optimal system operations. The changed parameters are listed on the
screen when set to Comfort.
• Normal - This setting cools the home to the desired temperature
setting. Once second-stage is activated by timer or differential,
it will not stage down to rst-stage until the next cooling cycle
demand.
• Comfort - This is when the system could automatically stage up or
down based on the current load demand.
Cooling
Prognostics
This algorithm will determine whether the unit will run out of capacity
during the hottest time of summer. It will look back everyday a
minimum of three days to see if there is a pattern and compare it
to the hottest day on record for that zip code before triggering an
notication. It must see a pattern before it will trigger the notication.
There may be a component or components that will require attention.
The sensitivity (threshold) selection options are OFF, LOW,
MEDIUM, and HIGH. The default is HIGH. The alert code notication
is 65545.

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