LENNOX S40 Smart Thermostat User Guide
NOTE: At least one Smart Room Sensor must be ON in order to calculate
Heat / Cool
the current temperature.
This screen allows changes to how the system operates. Options are single
set-point, heat pump mode (normal or comfort), auxiliary heat and safety
protection.
Perfect Temperature
1. This option will only be available in non-zoning systems. This option
allows the user to control both heating and cooling temperatures with one
single temperature setting. Factory default is off.
NOTE: When set to Perfect Temp, the Heat • Cool position indicator
changes. The blue color (cooling) indicator is on the left and heating
(red) indicator is on the right. This is just the opposite on how it is
displayed in normal Heat • Cool mode. Also the Heat • Cool mode
indicator will display Auto instead.
NOTE: Perfect Temp is not compatible with Google Assistant. Google
Assistant will not be able to adjust the home temperature.
2. Select Heat Pump Mode: (only available with system using a heat
pump). Options are normal and comfort. Default is normal. Descriptions
for what each setting does is displayed on the screen.
Figure 21. Thermostat - Sleep Mode Selections
Wider Set-Point Range
Figure 21 shows Sleep Mode enabled, the Sleep Mode schedule, and the
Smart Room Sensors that have been selected to function in Sleep Mode.
Notice the selections are confirmed beneath the Smart Room Sensor list on
the thermostat.
Changes the default low and high maximum temperature setting from 60-
90°F to 40-99°F (15.5 - 32.0°C to 4.5 - 37.0°C).
Auxiliary Heat
When the outdoor temperature is above the high balance point, only the
heat pump is allowed to run. When outdoor temperatures are below the low
balance point, only the auxiliary heat source is allowed to run. When outdoor
temperatures are between the high and low balance points, then both the
heat pump and auxiliary heat source are allowed to run.
Auxiliary heat is the use of an additional heat source. When the heat pump
BTU capacity is not sufficient to keep up with the home’s heating demand;
sometimes it is also called supplemental heat. When used in a dual-fuel
mode, auxiliary heating is accomplished with a gas or oil fired unit. In this
mode of operation, the heat pump must shut down and uses just the auxiliary
heating unit for heating.
If the system is an air handler with electric heat, the auxiliary heat will be in
conjunction with the heat pump when the home heating requires it. Another
use of auxiliary heat with heat pump systems includes a setting called
Balance Point. Balance point puts temperature limits on when the heat pump
and electric heat can work together, or independently.
Fan
Allergen Defender
Go to Menu > Settings > Fan to turn on or off Allergen Defender. Internet
weather must be enabled and the pollen count is high for the following
pollens (Grass, Ragweed, Mold, Tree and Overall Pollen) the fan will run
between heating or cooling demands to help clean the air. Works best with
MERV 11 or higher filter.
Circulation Timer Adjustment
Air circulation can be adjusted on this screen. Adjustments between 9 to 27
minute duration per hour. The circulate option runs during any mode selected
except when the system is turned off.
» When the outdoor temperature is above the default high balance point
32
| General | Details |
|---|---|
| Name | LENNOX S40 Smart Thermostat User Guide |
| Make | Lennox |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.3 MB |
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