Lennox ComfortSense 3000 Series Operation Manual
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Lennox ComfortSense 3000 Series Operation Manual

Programmable thermostat
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2018 Lennox Industries Inc.
©
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
L3532H 5/2 Day Programmable

Thermostat

This thermostat, model L3532H 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 L3532H is suitable for heat pump,
3-stage heat/2-stage cool applications using a gas
or electric auxiliary heat source. An optional outdoor
temperature sensor provides auxiliary heat lockout,
balance point operation, and dual-fuel compatibility.

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 L3532H thermostat. Refer to the installation
manual for instructions regarding installation and wiring of
the thermostat.
OPERATION MANUAL
ComfortSense
Model No. L3532H 5/2 Day
Programmable Thermostat
CONTROLS
506074-02
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 .........................................4
HOLD - Using Temperature Hold Modes ........................4
PROG - Thermostat Programming .................................5
FAN - Controlling the Fan Operation ..............................5
SETTINGS - Balance Point ............................................6
Service Indicator .............................................................7
Thermostat RESET ........................................................7
Removing/Installing Thermostat .....................................7
Default Thermostat Settings ...........................................7
Technical Specifications .................................................7
Temperature Setpoint Range..........................................8
Fan Control .....................................................................8
Default Thermostat Settings ...........................................9

Initial Thermostat Power-up

When power is initially applied to the thermostat, he
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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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 L3532H 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 8 show all system and programming defaults.

  • Page 3: Heat - Using The Heat Mode

    HEAT - Using the Heat Mode Normal Heat Mode In normal heat mode, both the heat pump and the backup heat source are used to provide heat. If the thermostat detects that the heat pump is not able to provide enough heat (as may be the case in very cold weather), then the Figure 6.

  • Page 4: Cool - Using The Cool Mode

    demand is present, ”Lo” will be displayed in the SYSTEM COOL - Using the Cool Mode box. However, if a large cooling demand is present, ”Hi” will be displayed in the SYSTEM box (shown in figure 11). Enabling and Disabling Cool Mode NOTE: If no buttons are pressed during a demand for Use the COOL button to enable or disable cool mode as cooling, the equipment must operate for at least 4...

  • Page 5: Prog - Thermostat Programming

    Figure 13. Temporary Hold Temperature Mode While in Temporary Hold, press HOLD once to switch to Permanent Hold (HOLD displays solid; PROG not displayed); press HOLD again to return to the program Figure 15. 5/2 Program Example (PROG displays; HOLD not displayed). NOTE: Pressing ENTER during the following programming PROG - Thermostat Programming steps, saves and exits to the HOME screen.

  • Page 6: Settings - Filter/Maintenance Reminders

    If auto fan mode is selected (AUTO displayed in FAN box at any time to store any changes and exit to the - see figure 14), the fan will only run when the heating or HOME screen. cooling equipment is running. After either programmed interval has elapsed, the reminder will be displayed as shown in figure 19.

  • Page 7: Service Indicator

    point is 40°F and the actual outdoor temperature Default Thermostat Settings is 35°F, the outdoor temperature must rise to 43°F before equipment adjustment occurs. Conversely, Default thermostat settings are in table 2 and the default if the balance point is 40°F and the actual outdoor program is shown in table 3.

  • Page 8: Temperature Setpoint Range

    If the Fahrenheit/Celsius display must be changed, use a Table 4. L3532H Terminal Designations plastic, non-conductive tool to push the dip switch to the Terminals Descriptions right position (see figure 22). 24VAC common Outdoor temperature sensor connection 1 Outdoor temperature sensor connection 2 * For most applications, E will be jumpered to W1.

  • Page 9: Default Thermostat Settings

    status, maintenance reminder status, and equipment With a small COOL demand, temperature is above protection timers). After 24 hours of power loss, programmed setpoint +0.5F but below setpoint +1.5F AND settings will be lost and replaced with default settings. 30-minute upstage timer HAS NOT expired. With a large COOL demand, temperature is above IMPORTANT setpoint +1.5F OR 30-minute upstage timer HAS...

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