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
L3522C 5/2 Day Programmable
Thermostat
This thermostat, model L3522C 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 L3522C is suitable for non-heat pump,
two-stage heat/two-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 L3522C thermostat. Refer to the installation
manual for instructions regarding installation and wiring of
the thermostat.
OPERATION MANUAL
ComfortSense
Model No. L3522C 5/2 Day
Programmable Thermostat
CONTROLS
506075-02
9/2018
Supersedes 5/2017
Table of Contents
Thermostat .....................................................................1
General ...........................................................................1
Introduction .....................................................................1
Initial Thermostat Power-up ............................................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
Thermostat Output Table ................................................8
Initial Thermostat Power-up
When power is initially applied to the thermostat, the
display will appear as shown in figure 1.
Figure 1. Initial Power-Up Display
All display segments are momentarily activated. This
occurs as a normal part of thermostat initialization.
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 L3522C thermostat. Refer to the installation manual for instructions regarding installation and wiring of the thermostat. -
Page 2: Buttons, Backlight, Timers & Settings
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. NOTE: Tables 2 and 3 on page 6 show all system and programming defaults. -
Page 3: Heat - Using The Heat Mode
NOTE: Heating equipment is activated for at least 3 minutes HEAT - Using the Heat Mode if no buttons are pressed during the demand interval. Enabling and Disabling Heat Mode COOL - Using the Cool Mode The thermostat must be in the HEAT mode to control the heating equipment. -
Page 4: Hold - Using Temperature Hold Modes
While in Temporary Hold, press HOLD once to switch equipment operation is locked out for 5 minutes. If another cooling demand occurs during this 5-minute to Permanent Hold (HOLD displays solid; PROG not displayed); press HOLD again to return to the program interval, “COOL”... -
Page 5: Fan - Controlling The Fan Operation
To program events and temperatures, perform the following is required, as (and if) defined, by you. These optional steps, once with Cool selected and once with Heat selected. reminders are not enabled until you activate them. To do so, press the Settings button (shown below the Fan button in 1. -
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: Thermostat Output Table
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, Small...