Lennox ComfortSense L3021H Operation Manual
Non-programmable thermostat
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E2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Description
The Lennox ComfortSenset 3000 Series model L3021H
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.
Thermostat model L3021H is suitable for 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 the Lennox model
L3021H thermostat. Refer to the installation manual for
instructions regarding installation and wiring of the thermo-
stat.
02/08
*2P0208*
OPERATION MANUAL
ComfortSenset 3000 Series
Model No. L3021H
Non-Programmable Thermostat
CONTROLS
506078−01
02/08
Supersedes 504,931M
Table of Contents
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Initial Thermostat Power-up
When power is initially applied to the thermostat, the dis-
play will appear as shown in figure 1.
88
ROOM
SETPOINT
Figure 1. Display − Initial Power−Up
All display segments are momentarily activated. This oc-
curs 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).
*P506078-01*
Litho U.S.A.
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FILTER
SERVICE
FAN
ON
AUTO
88
SYSTEM
COOL
OFF
EMG.
HEAT
506078−01
1
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Table of Contents
Related Manuals for Lennox ComfortSense L3021H
Summary of Contents for Lennox ComfortSense L3021H
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Page 1: Table Of Contents
OPERATION MANUAL ComfortSenset 3000 Series E2008 Lennox Industries Inc. Dallas, Texas, USA Model No. L3021H Non-Programmable Thermostat CONTROLS 506078−01 Litho U.S.A. 02/08 Supersedes 504,931M Table of Contents Thermostat ........ -
Page 2: Heating Control
Enabling and Disabling Heat Mode Use the HEAT button to select normal heat mode, emer- ROOM gency heat mode, or to disable heat modes as desired. If the thermostat is in off mode, normal heat mode is enabled when the HEAT button is pressed. This is indicated by HEAT in the SYSTEM box as shown in figure 4. -
Page 3: Cooling Control
Heating Demand The thermostat will then activate the cooling equipment to satisfy the demand. Cooling operation is indicated by a The thermostat must be in either normal or emergency snowflake icon in the SYSTEM box as shown in figure 8. heat mode in order to properly control the heating equip- When the actual temperature drops below the temperature ment. -
Page 4: Fan Control
Fan Control Filter Reminder The L3021H thermostat includes a filter reminder feature. The filter reminder can be set for 1, 3, 6, or 12−month inter- The FAN button is located behind the small door on the vals. The SETTINGS button, located behind the door on right-hand side of the thermostat. -
Page 5: Service Indicator
If the optional outdoor sensor (X2658) is connected to the thermostat, balance point adjustment is available. The bal- ance point feature allows the measured outdoor tempera- SERVICE ROOM ture to govern operation of the heat pump and backup heat source. Use the SETTINGS button to access the balance point AUTO setting. -
Page 6: Thermostat Reset
Temperature Setpoint Range Thermostat RESET Setting range: 50°F (10°C) to 90°F (32°C) Setting resolution: 1°F (1°C) Under some abnormal conditions, it may be desirable to reset the thermostat to its default condition. The RESET Temperature Control Band button can be used to return the unit to normal operation after an occurrence such as an electrical storm or power SP+1.5F . - Page 7 Table 2. L3021H Terminal Designations Minimum Compressor ON time: 4 minutes Minimum Furnace ON time: 3 minutes Connections Description Minimum backup furnace cycle time (elapsed time be- Reversing valve, cool active tween any furnace activation and the next furnace activa- tion): 6 minutes.
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Page 8: Thermostat Output Table
Service Reminder LCD Backlight The SERVICE indicator is displayed only under the follow- Activated for 8 seconds when any key is pressed. ing conditions: if the thermostat Y1 terminal has been activated with NOTE − During an electrical storm or similar disturbance, 24VAC for at least 5 minutes, AND the L terminal is the backlight may activate for a few seconds. - Page 9 Table 3. Thermostat Output States Condition Electric Heat Backup − No Outdoor Sensor small heat demand large heat demand emergency heat demand cool demand no demand Gas Heat Backup (Dual Fuel) − No Outdoor Sensor small heat demand large heat demand emergency heat demand cool demand no demand...