OPERATION MANUAL
ComfortSenset 3000 Series
Non-Programmable Thermostat
E2008 Lennox Industries Inc.
Dallas, Texas, USA
Model No. L3011C
CONTROLS
506079−01
02/08
Litho U.S.A.
Supersedes 504,865M
Table of Contents
L3011C Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Thermostat Power-up . . . . . . . . . . . . . . . . . . . . .
Adjusting Temperature Setpoint . . . . . . . . . . . . . . . . .
Thermostat RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Thermostat Settings . . . . . . . . . . . . . . . . . . . .
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Output Table . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
L3011C Thermostat
Initial Thermostat Power-up
The Lennox ComfortSenset 3000 Series model L3011C
non-programmable electronic thermostat is easy-to-use,
has a large, easy-to-read display, and provides excellent
temperature control. The thermostat also includes a pro-
grammable filter change reminder, and a system check in-
dicator which will notify the user of the need for equipment
service.
When power is initially applied to the thermostat, the dis-
FILTER
SERVICE
ROOM
88
Thermostat model L3011C t is suitable for non-heat pump,
single−stage heat/single cool applications that are
matched with a gas or electric furnace.
FAN
ON
AUTO
General
SYSTEM
COOL
OFF
EMG.
HEAT
88
SETPOINT
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Figure 1. Display − Initial Power−Up
Introduction
This document describes the operation of Lennox model
L3011C thermostat. Refer to the installation manual for
instructions regarding installation and wiring of the thermo-
stat.
All display segments are momentarily activated. This oc-
curs as a normal part of thermostat initialization. Within a
(figure shows temperature in Fahrenheit units).
02/08
506079−01
*2P0208*
*P506079-01*
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Use the UP or DOWN arrow keys to adjust the setpoint up
or down. The setpoint will increase by 1°F each time the
UP key is pressed. The setpoint will decrease by 1°F each
time the DOWN key is pressed.
Cooling Demand
The thermostat must be in cool mode in order to properly
control the cooling equipment. When in cool mode, if the
room temperature is higher than the temperature setpoint,
a cooling demand is detected by the thermostat.
After the desired setpoint is reached, the HOME screen
will reappear after about 8 seconds.
The thermostat will thenactivate thecooling equipment to
satisfy the demand. Cooling operation is indicated by a
When the actual temperature drops below the temperature
setpoint, the snowflake icon will disappear. This indicates
that the cooling demand has been satisfied and that the
cooling equipment has been turned off.
Fan Control
The FAN button is located behind the small door on the
button can be used to select either continuous fan mode or
auto fan mode.
If continuous fan mode is enabled, the fan will run continu-
ously regardless of whether the heating or cooling equip-
ment is running. Also, ON will be displayed in the FAN box
ROOM
79
FAN
AUTO
SYSTEM
COOL
ROOM
73
FAN
ON
Figure 7. Cooling Demand
NOTE − The cooling equipment is activated for at least 4
minutes if no buttons are pressed during the demand inter-
val. Cooling equipment operation is locked out for 5 min-
utes after a demand has been satisfied. If another cooling
demand occurs during this 5−minute interval, the snow-
flake icon will flash; however, the cooling equipment will
not run until the 5−minute delay has elapsed.
SYSTEM
HEAT
Figure 9. Fan ON with Icon
If auto fan mode is selected, the fan will only run when the
heating or cooling equipment is running. In this case,
Adjusting Temperature Setpoint
The temperature setpoint represents the desired tempera-
ture of the space around the thermostat. The default tem-
perature setpoint is 70°F. To adjust the setpoint, press the
UP or DOWN arrow keys to the right of the display screen.
The existing setpoint will be displayed just below the actual
ROOM
73
FAN
AUTO
SYSTEM
69
ROOM
FAN
AUTO
HEAT
SYSTEM
64
Figure 10. Fan AUTO with Icon
SETPOINT
To change from continuous to auto fan mode and vice ver-
sa, press the FAN button. Also note the presence of a fan
icon in the FAN box. This icon indicates that the fan is run-
ning.
HEAT
Figure 8. Setpoint Display and Adjustment
L3011C THERMOSTAT
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Filter Reminder
FILTER
The L3011C thermostat includes a filter reminder feature.
The filter reminder can be set for 1, 3, 6, or 12−month inter-
vals. The SETTINGS button, located behind the door on
the right−hand side of the thermostat is used to set the filter
ton from the HOME screen to display the Filter Reminder
ROOM
72
FAN
AUTO
SYSTEM
FILTER
HEAT
0
Figure 12. Display of Filter Reminder
Service Indicator
When abnormal equipment operation is detected, the
SERVICE indicator will flash on the upper-right corner of
the screen. This indicates that the equipment requires ser-
vice from a qualified service technician. The SERVICE in-
Figure 11. Filter Reminder Settings
The default setting for the filter reminder is 0, which dis-
ables the function. Use the UP arrow while in the Filter Re-
minder Settings screen to select the desired interval be-
tween reminders. It may be necessary to press the UP
arrow several times to access the desired setting. The
HOME screen will reappear about 10 seconds after the ar-
row key has been pressed for the final time.
SERVICE
ROOM
73
FAN
AUTO
SYSTEM
After the programmed interval has elapsed, the FILTER re-
ter has been changed, reset the filter reminder by pressing
the SETTINGS button for 4 seconds. The screen will blink
for a few moments to indicate that the timer has been reset.
HEAT
Figure 13. Service Indicator Flashing
506079−01 02/08
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Temperature Setpoint Range
Setting range: 50°F (10°C) to 90°F (32°C)
Setting resolution: 1°F (1°C)
Thermostat RESET
Under some abnormal conditions, it may be desirable to
ꢀreset" the thermostat to its default condition. This can be
useful on rare occasions when the the thermostat is behav-
ing abnormally (e.g. after an electrical storm or power out-
age). The RESET button can be used to recover from this
situation.
Fan Control
AUTO or ON modes, gas or electric heat compatible via
DIP switches (also see Thermostat Output section).
I/O Relays
The RESET button is an unlabeled, recessed button lo-
cated behind the door on the right−hand side of the thermo-
stat, just below the SETTINGS button. The RESET button
press the RESET button. After the RESET button is
pressed, the thermostat settings will return to the defaults
listed in the Default Settings section.
All thermostat relays are latching type to minimize power
consumption.
1.. HEAT/COOL relay output
2.. FAN relay output
3.. SERVICE relay input
Equipment Protection Timers
Minimum Compressor OFF time: 5 minutes
Minimum Compressor ON time: 4 minutes
Minimum Furnace ON time: 3 minutes
Default Thermostat Settings
Default thermostat settings are in table 1.
Table 1. Default Thermostat Settings
Minimum furnace cycle time (elapsed time between any
furnace activation and the next furnace activation): 6 min-
utes.
Mode
Heat
Setpoint
Fan
70°F (or 21°C)
Auto
Minimum elapsed time between any compressor activa-
tion and the next compressor activation: 6 minutes.
Filter Reminder
OFF (reminder setting = 0)
NOTE − All protection timers (except the compressor OFF
timer) can be over−ridden if a heating or cooling demand is
initiated or terminated using the UP, DOWN, HEAT, or
COOL buttons.
Equipment Protection Reset back to zero
Timers
Technical Specifications
Equipment Protection Override
Thermostat Type
Both the minimum compressor OFF timer and the mini-
mum equipment cycle timer can be over−ridden by press-
ing and holding either the HEAT or COOL button down for 4
seconds.
Electronic nonprogrammable thermostat for 1H/1C, gas or
electric heat, non−heat pump, non−power robbing applica-
tions.
Power Supply Range
18VAC − 30VAC (24VAC nominal), 60Hz
Over−Temperature Protection
Thermal mechanical switch opens W1 at 93°F+/−6°F.
Temperature Display
Display Scale: Fahrenheit or Celsius user selectable (via
DIP switches)
Filter Reminder
Settings of 0 (Off), 1, 3, 6 or 12 months are available. When
programmed time has elapsed, a FILTER indicator is dis-
played.
Display range: 35°F (2°C) to 99°F (37°C)
Display resolution: 1°F (1°C)
Display Accuracy: +/−1°F
Service Reminder
The SERVICE indicator is displayed only under the follow-
ing conditions:
Temperature Measurement Range
Measurement Scale: Fahrenheit
Measurement Range: 35°F to 99°F
S
if the thermostat Y1 terminal has been activated with
24VAC for at least 5 minutes, AND the L terminal is
shorted to the R terminal;
Measurement Resolution: 0.5°F
Measurement Accuracy: +/−1°F
Field Offset: via DIP switches to +/−3°F
Sampling Method: temperature measurements sampled
every 15 seconds. Displayed temperature is the average
of the last four measurements.
OR
S
if the thermostat Y1 terminal has been activated with
24VAC for at least 5 minutes, AND the L terminal is
shorted to the C terminal.
L3011C THERMOSTAT
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Power Loss/Recovery
Thermostat Output Table
Thermostat memory is retained for a minimum of 24 hours
during a power loss (includes retention of programmed
temperature setpoint, heat/cool and fan mode settings, fil-
ter reminder status, and equipment protection timers). Af-
ter 24 hours of power loss, programmed settings will be
lost and replaced with default settings.
various input conditions.
Table 2. L3011C Thermostat Outputs
Condition
W1
Y1
G
Gas Heat, Auto Fan
heat demand
X
cool demand
X
X
IMPORTANT
no demand
Power must be applied for at least six consecutive
hours prior to a power loss in order for memory to
be retained for the specified time.
Gas Heat, Continuous Fan
heat demand
X
X
X
X
X
cool demand
X
X
X
LCD Backlight
no demand
Activated for 8 seconds when any key is pressed.
Electric Heat, Auto Fan
heat demand
X
X
NOTE − During an electrical storm or similar disturbance,
the backlight may activate for a few seconds. This is nor-
mal and will no longer occur after the electrical disturbance
has passed.
cool demand
no demand
Electric Heat, Continuous Fan
Thermostat Operating Conditions
heat demand
cool demand
no demand
X
X
X
X
35°F to 105°F, 5% to 90% RH
Thermostat Storage Conditions
NOTE − X = output is activated with 24VAC.
−40°F to 185°F, 5% to 95% RH
506079−01 02/08
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