Lennox L3011C User Manual
OPERATION MANUAL
E2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
ComfortSenset 3000 Series
Model No. L3011C
Non-Programmable Thermostat
CONTROLS
506079−01
02/08
Supersedes 504,865M
Table of Contents
L3011C Thermostat 1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Thermostat Power-up 1. . . . . . . . . . . . . . . . . . . . .
Heating Control 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Control 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Temperature Setpoint 3. . . . . . . . . . . . . . . . .
Fan Control 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Reminder 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Indicator 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat RESET 5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Thermostat Settings 5. . . . . . . . . . . . . . . . . . . .
Technical Specifications 5. . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Output Table 6. . . . . . . . . . . . . . . . . . . . . . .
Litho U.S.A.
L3011C Thermostat
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 programmable filter change reminder, and a system check indicator which will notify the user of the need for equipment
service.
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.
General
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.
Introduction
This document describes the operation of Lennox model
L3011C thermostat. Refer to the installation manual for
instructions regarding installation and wiring of the thermostat.
Initial Thermostat Power-up
When power is initially applied to the thermostat, the display will appear as shown in figure 1.
FILTER
ROOM
SETPOINT
Figure 1. Display − Initial Power−Up
All display segments are momentarily activated. This occurs as a normal part of thermostat initialization. Within a
few seconds, the display will appear as shown in figure 2
(figure shows temperature in Fahrenheit units).
88
88
SERVICE
FAN
ON
AUTO
SYSTEM
COOL
OFF
EMG.
HEAT
02/08 506079−01
*2P0208* *P506079-01*
ROOM
70
FAN
AUTO
If the thermostat is in heat mode, heat mode is disabled
when the HEAT button is pressed. This is indicated by OFF
in the SYSTEM box as shown in figure 5.
SYSTEM
HEAT
Figure 2. Display − Home Screen
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 indicated in the SYSTEM box at lower right).
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
SETPOINT
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 thermostat will then activate the heating equipment to satisfy the demand. Heating operation is indicated by a flame icon in the
SYSTEM box as shown in figure 6.
ROOM
69
64
72
FAN
AUTO
SYSTEM
OFF
FAN
AUTO
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 enabled when the HEAT button is pressed. This is indicated
by HEAT in the SYSTEM box as shown in figure 4.
ROOM
SETPOINT
Figure 4. Heat Mode Enabled
69
64
FAN
AUTO
SYSTEM
HEAT
88
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 heating equipment has been turned off.
NOTE − The heating equipment is activated for at least 3
minutes if no buttons are pressed during the demand interval.
Cooling Control
The COOL button is located behind the small door on the
right-hand side of the thermostat. See figure 3.
Enabling and Disabling Cool Mode
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 indicated by COOL in the SYSTEM box.
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.
SYSTEM
HEAT
506079−01 02/08
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