Lennox S40 Installation And Setup Guide

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Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Zone 1 through 4
Heating CFM
Minimum and maximum CFM will be dependent on system
component congurations. These parameter values are automatically
adjusted to the specic hardware conguration (See table 9 in
Lennox Smart Zoning installation instruction for minimum CFMs for
specic indoor units).
Target heating CFM for a specic zone. Range is 5 to maximum
of indoor unit. Default is dependent on tonnage of indoor unit.
Adjustments are in increments of 5 CFM. Adjustments are in
increments of 5 CFM.
Zoning Anticipated
Discharge Air
Temperature
Adjustment
This parameter setting compensates for a rapid change of the
discharge air temperature due to fast changing conditions. It
examines the change in the discharge air temperature for the
previous two minutes and extrapolates or looks forward by the
number of seconds set in the parameter and uses this as the DATS
value for staging. This parameter setting helps prevent limit trip/
frozen coil from occurring.
Range is 0 to 120 seconds. Default is 0 seconds. Adjustments are in
increments of 5 seconds.
Zoning Gas
Heating DAT Cool
Down Target
At the end of a gas cycle, the Heat Blower Off-Delay may not be long
enough to completely cool the heat exchanger. This may result in a
primary limit trip then, or at the beginning of the next heat demand.
This parameter allows the blower to run after a gas heat call ends
until the discharge air temperature sensor (DATS) cools to the
temperature set in the parameter. If the temperature is set too low
this will cause the temperature in the room to overshoot.
Range is 80 to 90°F (26.67 - 32.22°C). Default is 90°F (32°C).
Adjustments are in increments of 1°F (0.56°C).
Zoning Initial
Staging Hold Time
for Gas Heating
In zoning systems, the furnace was upstaging before the discharge
air sensor reached a steady-state value and it would sometimes trip a
limit due to staging up the gas before the blower would even come on
(as occurs during pressure switch calibration).
In addition and options for delaying the rst staging event even
further since the starting point of the modulation gas heat in zoning
is picked to be appropriate for the airow being provided, so this
parameters allows an adjustment on top of the initial delay. Range:
3.0 – 8.0 minutes, with a default: 5.0 minutes. Can be adjusted in 1
minute increments.
Zoning Minimum
Zone Run-Time
Range is 90 to 600 seconds. Default is 120 seconds. Adjustments are
in increments of 30 seconds.
Zoning Supply
Air Temp Limit
for Cooling
In cooling mode, this setting sets the discharge air temperature low
limit. Below this temperature, the cooling is turned off.
Range is 35 to 45°F (1.67 - 7.22°C). Default is 40°F (4.44°C).
Adjustments are in increments of 1°F (0.56°C).
Zoning Supply Air
Temp Limit for Gas
/ Electric Heating
In heating mode, this setting sets the target discharge air
temperature.
Range is 120 to 160°F (48.88 to 54.44°C). Default is 125°F (52°C).
Adjustments are in increments of 5°F (2.78°C).
Table 5. Thermostat Parameters
Parameter
(In alphabetical
order)
Description
Zoning Target
Supply Air Temp
for Cooling
In cooling mode, this setting sets the target discharge air
temperature.
Range is 40 to 60°F (4.44 - 15.56°C). Default is 45°F (7.22°C).
Adjustments are in increments of 1°F (0.56°C).
Zoning Target
Supply Air Temp
for HP Heating
In heat pump heating mode, this setting sets the target discharge air
temperature.
Range is 85 to 110°F (29.44 to 43.33°C). Adjustments are in
increments of 1°F (0.56°C). Default 90°F (32°C) plus 20 degrees
overshoot for both stage and variable capacity systems.
Zoning Target
Supply Air Temp
for Gas/Electric
Heating
Default is 110°F. Range is 100°F to 130°F with 1 degree increment
adjustable. In heating mode, this setting sets the target discharge
air temperature. Default 100°F (38°C) plus 20 degrees overshoot for
both stage and variable capacity systems.
Table 6. Thermostat Parameters - Heat Cool Stages Locked In
H/C
Stages
Locked =
Enabled
H/C
Stages
Locked =
Disabled
POINTS:
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
SP +1.5SP +1.0 0.2+ PS5.0+ PS
Stg1 Differential
Stg2 Differential
Stg2 Differential
Stg1 Differential
Cooling (1- and 2-Stages)
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
1st stage
ON
2nd stage
ON
1st stage
ON
2nd stage
ON
2nd
stage
OFF
1st
stage
OFF
1st
stage
OFF
2nd stage
OFF
SP -1.5SP -1.0 SP -0.5
SP
SP +0.5SP -2.0
Stg1 Differential
Stg2 Differential
SP -2.5SP -3.0
Stg1 Differential
Stg2 Differential
POINTS:
Heating - Non-Heat Pump or Heat Pump w/o backup heat - 1 or 2 stages

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