LENNOX S40 Smart Thermostat User Guide
Smart Zoning System
Table 3. Humidity Control Modes of Operations
NOTE: Lennox Smart Zoning Control only functions with Lennox
Setting
communicating systems.
Description
Mode
IMPORTANT
The Lennox Smart Room Sensor is not compatible with systems using the
Lennox Smart Zoning System (iHarmony).
dehumidification set−point
48%
For user setting options, go to Menu > Settings > Zoning Control. By
default Zoning is ON on the Zoning Control screen. If the homeowner wishes
to place the system into central mode, then this setting must be OFF. Each
zone can be renamed on this screen.
40%
60%
Heating / Cooling Changeover
The following is an example of how the zoning system operates during a
heating / cooling changeover.
humidification set−point + dehumification set−point
When the system is satisfying a call from zone 1 for heating and receives a call
for cooling from zone 2, the following will occur:
40%
48%
15%
60%
• The system will continue to fulfill the demand from zone 1 until satisfied or a
maximum time of 20 minutes has been reached.
• If after 20 minutes the system is still operating based on satisfying the heating
demand from zone 1, the system will terminate that demand.
• The system will then shut system down for five (5) minutes. This allows for
system temperatures and operating pressures to stabilize.
Dew point adjustment mode will change the humidification set
point based on the outdoor temperature and a user-defined dew
point adjustment setting.
• After a five (5) minute delay the system will begin operations to satisfy the
cooling demand from zone 2.
NOTE: Dew Point - Adjustment requires an outdoor
temperature sensor and is automatically controlled by
the outside temperature.
The system will continue to operate in this manner each time it receives a zone
call that is opposite of the current mode of operation (heating or cooling).
dew point
on
0%
Cooling Operation
−15%
15%
When a zone thermostat makes a demand for cooling, the zone damper opens
and the cooling equipment begins operating.
Cooling demand is terminated when:
Dehumidification Accessory Installed
» All zone demands for cooling are terminated.
When either an Auxiliary Dehumidifier or Humiditrol equipment is installed
the settings available are Off and Dehumidify. When Dehumidify is selected
a Dehumidification Set-Point adjustment tool is available and allows
adjustments between 50% to 60%.
» The demand has exceeded the Heat • Cool changeover time limit (20
minutes) while a heat demand exists.
When cooling demand is terminated, a five minute minimum off time delay is
initiated. Second stage cooling is energized when the discharge air temperature
is 7°F higher than the set point of the cooling staging temperature settings.
35
| 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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