Lennox ComfortSenset 3000 Series Non Programmable Thermostat Thermostat User Manual

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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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If the thermostat is in heat mode, heat mode is disabled  
when the HEAT button is pressed. This is indicated by OFF  
ROOM  
FAN  
70  
AUTO  
SYSTEM  
ROOM  
69  
FAN  
AUTO  
HEAT  
SYSTEM  
SETPOINT  
64  
Figure 2. Display − Home Screen  
OFF  
Figure 2 illustrates the HOME screen. Note that an indoor  
room temperature of 70°F is initially displayed. After about  
1 minute of warm−up time, the actual room temperature will  
be displayed. HEAT mode is the system default (as indi-  
cated in the SYSTEM box at lower right).  
Figure 5. Heat Mode Disabled  
Heating Demand  
The thermostat must be in heat mode in order to properly  
control the heating equipment. When in heat mode, if the  
actual temperature is lower than the temperature setpoint, a  
heating demand is detected by the thermostat. The thermo-  
stat will then activate the heating equipment to satisfy the de-  
mand. Heating operation is indicated by a flame icon in the  
SYSTEM box as shown in figure 6.  
A pale blue display backlight will turn on each time a key is  
pressed. The backlight will turn off 8 seconds after the last  
key is pressed.  
Heating Control  
The HEAT button is located behind the small door on the  
right−hand side of the thermostat. See figure 3.  
ROOM  
72  
FAN  
AUTO  
SYSTEM  
88  
HEAT  
Figure 6. Heating Demand  
When the actual temperature rises above the temperature  
setpoint, the flame icon will disappear. This indicates that  
the heating demand has been satisfied and that the heat-  
ing equipment has been turned off.  
Figure 3. Additional Thermostat Buttons  
Enabling and Disabling Heat Mode  
Use the HEAT button to enable or disable heat mode as  
desired. If the thermostat is in off mode, heat mode is en-  
abled when the HEAT button is pressed. This is indicated  
by HEAT in the SYSTEM box as shown in figure 4.  
NOTE − The heating equipment is activated for at least 3  
minutes if no buttons are pressed during the demand inter-  
val.  
Cooling Control  
The COOL button is located behind the small door on the  
right-hand side of the thermostat. See figure 3.  
ROOM  
69  
FAN  
Enabling and Disabling Cool Mode  
AUTO  
Use the COOL button to enable or disable cool mode as  
necessary. If the thermostat is in off mode, cool mode is  
enabled when the COOL button is pressed. This is indi-  
cated by COOL in the SYSTEM box.  
SYSTEM  
SETPOINT  
64  
If the thermostat is in cool mode, cool mode is disabled  
when the COOL button is pressed. This is indicated by  
OFF in the SYSTEM box.  
HEAT  
Figure 4. Heat Mode Enabled  
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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  
snowflake icon in the SYSTEM box as shown in figure 7.  
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  
right-hand side of the thermostat. See figure 3. The FAN  
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,  
AUTO will be displayed in the FAN box as shown in figure 10.  
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  
reminder interval. See figure 3. Press the SETTINGS but-  
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-  
minder will be displayed as shown in figure 12. After the fil-  
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  
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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  
is visible in figure 3. Use a paper clip or small pencil to  
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.  
Table 2 depicts the L3011C thermostat output states for  
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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