Lennox ComfortSense 3000 Series Operation Manual
5/2 day programmable thermostat
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- Operation manual (16 pages) ,
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- Installation instructions manual (6 pages)
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2018 Lennox Industries Inc.
©
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
L3511C 5/2 Day Programmable
Thermostat
This thermostat, model L3511C 5/2 day programmable
electronic thermostat has a large, easy-to-read display
and provides excellent temperature control. This product
includes a programmable filter change reminder, an
equipment maintenance reminder, and a system check
indicator to notify the user when the equipment requires
service.
Thermostat model L3511C is suitable for non-heat pump,
single-stage heat/single-stage cool applications with
either 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 the Lennox
model L3511C thermostat. Refer to the installation manual
for instructions regarding installation and wiring of the
thermostat.
OPERATION MANUAL
ComfortSense
Model No. L3511C 5/2 Day
Programmable Thermostat
CONTROLS
506076-02
9/2018
Supersedes 5/2017
Table of Contents
Thermostat .....................................................................1
General ...........................................................................1
Introduction .....................................................................1
Buttons, Backlight, Timers & Settings.............................2
Setting the Day and Time ...............................................2
HEAT - Using the Heat Mode .........................................3
COOL - Using the Cool Mode .........................................3
HOLD - Using Temperature Hold Modes ........................4
PROG - Thermostat Programming .................................4
FAN - Controlling the Fan Operation ..............................5
SETTINGS - Filter/Maintenance Reminders ..................5
Service Indicator .............................................................6
Thermostat RESET ........................................................6
Removing/Installing Thermostat .....................................6
Default Thermostat Settings ...........................................6
Technical Specifications .................................................6
Temperature Setpoint Range..........................................7
Fan Control .....................................................................7
Default Thermostat Settings ...........................................8
Thermostat Output Table ................................................8
Figure 1. Initial Power-Up Display
3000 Series
®
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Table of Contents
Related Manuals for Lennox ComfortSense 3000 Series
Summary of Contents for Lennox ComfortSense 3000 Series
-
Page 1: Table Of Contents
Check equipment for shipping damage. If you find any damage, immediately contact the last carrier. Introduction This document describes the operation of the Lennox model L3511C thermostat. Refer to the installation manual for instructions regarding installation and wiring of the thermostat. -
Page 2: Buttons, Backlight, Timers & Settings
All display segments are momentarily activated. This occurs as a normal part of thermostat initialization. Within a few seconds, the Home Screen appears (see figure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed. -
Page 3: Heat - Using The Heat Mode
HEAT - Using the Heat Mode COOL - Using the Cool Mode Enabling and Disabling Heat Mode Enabling and Disabling Cool Mode The thermostat must be in the HEAT mode to control the Use the COOL button to enable or disable cool mode as heating equipment. -
Page 4: Hold - Using Temperature Hold Modes
HOLD - Using Temperature Hold Modes PROG - Thermostat Programming When HOLD is displayed at the HOME screen, the The L3511C thermostat can be programmed to perform a thermostat is in a temperature hold condition. This means set of either heating or cooling events (but not a combination that the temperature program data is ignored and the of heat and cool) for 5 consecutive days using a set of 4 thermostat functions much like a non-programmable... -
Page 5: Fan - Controlling The Fan Operation
3. Use the Up/Down arrow buttons to select the desired minute; press PROG. 4. Use the Up/Down arrow buttons to select the desired temperature setpoint; press PROG. 5. Repeat steps 2 through 4 for periods B, C, and D. 6. Repeat steps 1 through 5 for the 2-day program. Figure 15. -
Page 6: Service Indicator
Service Indicator Table 2. Default Thermostat Settings Mode Heat (Permanent Hold) When abnormal equipment operation is detected, the Setpoint 70°F (or 21°C) SERVICE indicator will flash on the screen (see figure 17). Auto This indicates that the equipment requires service from a qualified service technician. -
Page 7: Temperature Setpoint Range
Minimum furnace cycle time (elapsed time between any furnace activation and the next furnace activation): 6 minutes. Minimum elapsed time between any compressor activation and the next compressor activation: 6 minutes. 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. -
Page 8: Default Thermostat Settings
Default Thermostat Settings Thermostat Operating Conditions 35°F to 105°F, 5% to 90% RH Thermostat Storage Conditions -40°F to 185°F, 5% to 95% RH Thermostat Output Table Table 5 depicts the L3511C thermostat output states for various input conditions. Table 5. Thermostat Outputs Condition Gas Heat, Auto Fan HEAT Demand...