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Lennox ComfortSense L3722C Operation Manual

Comfortsense 3000 series 7-day programmable thermostat
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E2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

L3722C 7−Day Programmable Thermostat

The Lennox ComfortSenset 3000 Series model L3722C
7-day programmable electronic thermostat
excellent
temperature
easy-to-read
display.
programmable filter change reminder, an equipment
maintenance reminder, and a system check indicator to
notify the user when the equipment requires service.
Thermostat model L3722C is suitable for non-heat pump,
two-stage heat/two-stage cool applications using a gas or
electric furnace. Also, the thermostat provides auto-
changeover capability.

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
L3722C thermostat. Refer to the installation manual for in-
structions regarding installation and wiring of the thermo-
stat.

Initial Thermostat Power-up

When power is initially applied to the thermostat, the dis-
play will appear as shown in figure 1.
02/08
*2P0208*
provides
control
and
has
a
This
product
includes
OPERATION MANUAL
ComfortSenset 3000 Series
Model No. L3722C 7-Day
Programmable Thermostat
CONTROLS
506071−01
02/08
Supersedes 505,068M

Table of Contents

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large,
a
Copy tofrom
PROG
A B C D
HOLD
FAN ON
AUTO
FILTER
MAINTENANCE
i88
OUTROOM
Figure 1. Initial Power−Up Display
All display segments are momentarily activated. This oc-
curs as a normal part of thermostat initialization.
Within a few seconds, the HOME screen appears (see fig-
ure 2) with default settings as shown. After about 1 minute
of initialization time, the actual room temperature will be
displayed.
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MO TU WE TH FR SA SU
I8:88
AM
PM
88
COOL SETPOINT
°
SERVICE
HEAT SETPOINT
88
°
*P506071-01*
Litho U.S.A.
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COOL
OFF
AUTO
EMG.
HEAT
°
Hi
Lo
506071−01

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Summary of Contents for Lennox ComfortSense L3722C

  • Page 1: Table Of Contents

    ° HEAT ° This document describes the operation of Lennox model L3722C thermostat. Refer to the installation manual for in- structions regarding installation and wiring of the thermo- Figure 1. Initial Power−Up Display stat. All display segments are momentarily activated. This oc- curs as a normal part of thermostat initialization.

  • Page 2: Buttons, Backlight, Timers & Settings

    NOTE − Tables 3 and 4 on page 7 show all system and Heat Cool programming defaults. Prog Auto I0:26 PROG A B C D Copy Day/Time HOLD (DOOR Hold OPEN) AUTO COOL ROOM AUTO Settings Enter EMG. ° HEAT (Outside) Figure 3.

  • Page 3: Heat − Heat Mode

    If your system supports 2−stage cooling (as does the L3722C thermostat), you may notice various cooling levels ROOM ° being delivered during a demand. Also, if a small cooling HEAT SETPOINT °...

  • Page 4: Auto − Using The Autochangeover Mode

    Figure 10. Temporary Hold Temperature Mode PROG − Thermostat Programming Copy Day/Time The L3722C thermostat can be programmed to perform a (DOOR Hold set of both heating and cooling events for each day of the OPEN) week. Each day can be programmed for 4 unique events per day, and each day can be different from any other day.

  • Page 5: Fan − Controlling Fan Operation

    Monday. Press the Hold COPY button. Repeat steps A and B for as many days as you Figure 14. Using Fan AUTO want the same program. Page 5 L3722C 7−DAY PROGRAMMABLE THERMOSTAT...

  • Page 6: Copy − Copy A Program

    AUTO Flashing EMG. ° The L3722C thermostat is designed to remind you when HEAT the filter needs changing or when routine maintenance is required, as (and if) defined, by you. These optional re- minders are not enabled until you activate them. To do so, press the SETTINGS button once or twice for the desired Figure 17.

  • Page 7: Removing/Installing Thermostat

    Maintenance Reminder Thermostat Output Table Equipment Protection Timers Reset Back to Zero Table 2 depicts the L3722C thermostat output states for Autochangeover various input conditions. The following notes described Table 4. Default Program Settings (Time/Temp) terms used in the table.
  • Page 8 If the Fahrenheit/Celsius display must be changed, use a Equipment Protection Timers plastic, non−conductive tool to push the dip switch to the Minimum Compressor OFF time ... 5 minutes right position (see figure 18). Minimum Compressor ON time .

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