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Lennox L3711C 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
L3711C 7−Day Programmable Thermostat
The Lennox ComfortSenset 3000 Series model L3711C
7-day programmable electronic thermostat provides
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 L3711C is suitable for non−heat pump,
single-stage heat/single-stage cool applications with either
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
L3711C 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*
control
and
has
a
This
product
includes
OPERATION MANUAL
ComfortSenset 3000 Series
Model No. L3711C 7-Day
Programmable Thermostat
CONTROLS
506072−01
02/08
Supersedes 505,067M

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.
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MO TU WE TH FR SA SU
I8:88
AM
PM
88
COOL SETPOINT
°
SERVICE
HEAT SETPOINT
88
°
*P506072-01*
Litho U.S.A.
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COOL
OFF
AUTO
EMG.
HEAT
°
Hi
Lo
506072−01

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Summary of Contents for Lennox L3711C

  • Page 1: Table Of Contents

    EMG. HEAT SETPOINT ° HEAT ° L3711C thermostat. Refer to the installation manual for in- structions regarding installation and wiring of the thermo- stat. Initial Thermostat Power-up Figure 1. Initial Power−Up Display When power is initially applied to the thermostat, the dis- All display segments are momentarily activated.

  • Page 2: Buttons, Backlight, Timers & Settings

    Within a few seconds, the HOME screen appears (see fig- Heat Cool ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be Prog Auto displayed. I0:26 Copy Day/Time PROG A B C D (DOOR Hold OPEN)

  • Page 3: Heat − Heat Mode

    NOTE − Heating equipment is activated for at least 3 min- utes if no buttons are pressed during the demand interval. These modes are described later. Page 3 L3711C 7-DAY PROGRAMMABLE THERMOSTAT...

  • Page 4: Hold − Temperature Hold Mode

    (see figure 8); the existing setpoint is displayed to the right of the actual room temperature. Each button The L3711C thermostat can be programmed to perform a press adjusts the setpoint up or down by 1 degree. set of both heating and cooling events for each day of the week.

  • Page 5: Copy − Copy A Program

    SETTINGS − Filter/Maintenance Reminders Figure 11. Copy a Programmed Day to Another The L3711C thermostat is designed to remind you when the filter needs changing or when routine maintenance is 7. Repeat steps 1 − 5 to program different times and tem- required, as (and if) defined, by you.

  • Page 6: Service Indicator

    The default setting for the reminders is OFF (disabled). Thermostat RESET Press Up/Down arrow buttons to select the desired re- Under some abnormal conditions, it may be necessary to minder intervals. reset" the thermostat to its default condition. Such a RE- Table 1.

  • Page 7: Thermostat Output Table

    Thermostat Output Table Table 4 depicts the L3711C thermostat output states for various input conditions. Table 4. L3711C Thermostat Outputs Condition Gas Heat, Auto Fan Heat Demand Cool Demand PLUG IN (Use Care To Avoid Bending Prongs.) No Demand Gas Heat, Continuous Fan...
  • Page 8 Table 5. L3711C Terminal Designations Maintenance Reminder Settings of Off, 6 or 12 (months of chronological time) are Terminal Description available. When programmed time has elapsed, a MAIN- 24VAC TENANCE indicator is displayed. First stage cooling Service Reminder First stage heating...

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