Lennox ComfortSense L7742U Guide de l'utilisateur

06/08 506061−01

*2P0608* *P506061-01*

E2008 Lennox Industries Inc.

Dallas, Texas, USA

COOLING

TUE OCT 23 1:15PM

Shipping and Packing List

1 − ComfortSensetModel L7742U touch screen, 7−day program-

mable thermostat

2 − Mounting screws (M3.5x25mm self−tapping screws)

2 − Wall Anchors

1 each − Installation Quick-Start Guide, Programming & Application

Guide, Homeowner’s Manual, Warranty card, Warranty Audit tag

PROGRAMMING AND

APPLICATION GUIDE

ComfortSenset7000 Series

Model L7742U Touch Screen Programmable Thermostat

CONTROLS

506061−01

06/08

Supersedes 05/08

IMPORTANT

In commercial applications, the ComfortSenset Model L7742U

thermostat can only be used with approved split-system

matches, and those which meet the following installation crite-

ria:

Sinstallation uses 18 GAUGE thermostat wire or larger,

Sthermostat wire run length DOES NOT EXCEED 300’ (91m),

Sload from any thermostat connection is LESS THAN 1 AMP.

If used with Harmony II®Zone Control System, consult Applica-

tion Note H−04−5.

Litho U.S.A.

506061−01 06/08 Page 2

Table of Contents

ComfortSensetModel L7742U Thermostat 3. . . . . . . . . . . . .

Features 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Fields & Touch Screen Points 4. . . . . . . . . . . . . . . . . .

Home ScreenCurrent Conditions & Temperature Settings 5

Controlling the Heat/Cool Modes of Operation 6. . . . . . . . . . .

Controlling the Fan Operation 7. . . . . . . . . . . . . . . . . . . . . . . . .

Schedule ScreenProgramming 8. . . . . . . . . . . . . . . . . . . . . .

Options screenReminders & User Settings 10. . . . . . . . . . . .

Options screenInstaller Settings 13. . . . . . . . . . . . . . . . . . . . .

Resetting Program to Factory Conditions 15. . . . . . . . . . . . . . .

EPA ENERGY STAR®Recommended Setpoints 16. . . . . . . . .

Humidification 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dehumidification 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Humiditrol

®Enhanced Dehumidification Accessory (EDA) 21.

Stage Delay and Differential Settings 23. . . . . . . . . . . . . . . . . . .

Temporary Temperature ChangePause the Schedule 29. . .

Remote Outdoor Sensor 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Memory Protection 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Date Code & Serial Number 31. . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A. Flow Diagrams & Wiring Diagrams 32. . . . . . . . . .

Appendix A. Diagnostic Information & Hidden Menu Tables 36

NOTE − This thermostat is equipped with automatic compressor

protection to prevent potential damage due to short cycling or extended

power outages. The short cycle protection provides a 5−minute delay

between heating or cooling cycles to prevent the compressor from be-

ing damaged.

WARNING

Always turn off power at the main power source by switching

the circuit breaker to the OFF position before installing or re-

moving this thermostat.

All wiring must conform to local and national building and elec-

trical codes and ordinances.

Do not switch system to cool if the outdoor temperature is be-

low 45°F (7°C). This can damage the cooling system.

CAUTION

This is a 24VAC low−voltage thermostat. Do not install on volt-

ages higher than 30VAC.

Do not short (jumper) across terminals on the gas valve or at the

system control to test installation. This will damage the thermo-

stat and void the warranty.

IMPORTANT

Read this manual before programming this thermostat.

Use this thermostat only as described in this manual.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 3

ComfortSensetModel L7742U Thermostat

Description

The ComfortSensetModel L7742U thermostat is an electronic 7−day

universal multi-stage programmable touch screen thermostat. It also

offers enhanced capabilities which include humidification measure-

ment and control, dew point adjustment control, dehumidification mea-

surement and control, Humiditrol®Enhanced Dehumidification Acces-

sory (EDA) capability, and equipment maintenance reminders. The

24VAC thermostat also features worry−free memory storage and a

menu−driven display. This document supports heat pumps or non−heat

pump units, with up to 4 stage heat / 2 stage cool heat pump (2 stages of

heat pump heating and 2 stages of auxiliary backup heat are provided.

Also, 2 stages of emergency heat are provided).

An optional outdoor temperature sensor (X2658) is required in applica-

tions with Humiditrol®EDA.

These instructions are intended as a general guide and do not super-

sede local codes in any way. Consult authorities having jurisdiction be-

fore installation.

Check equipment for shipping damage. If you find any damage, imme-

diately contact the last carrier.

Dimensions

Screen dimensions: 3−7/16" (87 mm) width x 2−9/16" (65 mm) height

Case dimensions: 5−7/8" (149 mm) width x 4−9/16" (116 mm) height x

1−1/4" (31mm) depth

Features

Outdoor Temperature Sensor (optional)

The outdoor sensor may be required, especially when using Humidi-

trol®EDA applications. In addition to measuring and displaying outdoor

temperature, the outdoor sensor provides dew point adjustment and

control for all models. If used with this thermostat, the sensor enables

optimal heating equipment operation via programmable balance points.

NOTE − The outdoor sensor uses standard thermostat wiring; it

may be wired using two wires of a multi−wire cable.

When the outdoor sensor is connected, the temperature is displayed in

the information display area (see figure 2).

NOTE − For proper operation of Humiditrol®EDA applications, the out-

door sensor (X2658) MUST be installed.

L" Input

L" input from the equipment is used to notify the user of an equipment

fault by displaying HVAC ERROR DETECTED" when one of the fol-

lowing conditions exist:

SL" terminal is activated with 24VAC and Y1 has been activated

for 5 minutes, OR,

SLSOM error signal is detected on L" input and Y1 has been acti-

vated for 5 minutes.

NOTE − If system is in battery mode, the L terminal is not functional. The

L input is used for diagnostic information purposes only, it is not in-

tended to provide equipment protection.

Compressor Short Cycle Protection

A 5−minute compressor short cycle protection timer begins when a

compressor output is de−energized. Also, if a power loss occurs, the

system will go into compressor protection mode and display WAIT in

the display if there is a cooling or compressor heating call.

506061−01 06/08 Page 4

Display Fields & Touch Screen Points

A Selection Tab touch fields − Press to select: HOME (normal dis-

play), SCHEDULE (for programming), OPTIONS (to set alerts, ser-

vice reminders, and other user and installer settings).

Figure 1. Touchscreen active fields

B MODE − press to cycle through HEAT, COOL, AUTO

(autochangeover),OFF, EM HEAT (emergency heat).

C FAN − press to cycle through ON, CIRC (circulate), AUTO.

D SCHED (schedule) − press to change between ON and OFF.

EDisplays the room temperature.

FDisplays the current operation SET AT point; if in AUTOchange-

over, both HEAT and COOL setpoints are identified.

GUp/down arrow touch fields used for adjusting temperature up or

down; if in AUTO (autochangeover) mode, 2 sets of up down ar-

rows.

HDisplays different information depending on the tab selected:

DHOME tab: displays outdoor temperature (if outdoor sen-

sor Lennox P/N X2658 is installed), indoor relative humid-

ity (RH), which mode is calling, hold settings information,

service reminders.

DSCHEDULE tab: displays the event being programmed;

DOPTIONS tab: displays a scrolling list of installer- and

user−adjustable parameters, including filter and service

reminder periods, etc.

ISchedule time adjustment, User/Installer Settings arrows:

DHOME screen: not visible except when executing a HOLD

SETTING)

DSCHEDULE and OPTION screens: used to adjust sched-

ule and option settings.

JDynamic touch fields − not visible in HOME screen unless execut-

ing a HOLD SETTING. For SCHEDULE and OPTIONS settings,

these boxes appear and change depending on the selection. See

the schedule and options sections for details.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 5

Home ScreenCurrent Conditions & Temperature Settings

INFORMATION

DISPLAY AREA

COOLING

TUE OCT 23 1:15PM

Figure 2. Home Screen

The HOME screen (figure 2) displays indoor temperature and outdoor

temperature if the X2658 sensor is installed outdoors and turned on in

user settings (outdoor sensor is required when humidity controlling fea-

tures are implemented). Other system operational information, such as

indoor relative humidity (if turned on in user settings), dehumidifying,

cooling or heating, will alternately be displayed in the information dis-

play.

The home screen displays temperature and the temperature settings in

large fonts. The INFORMATION DISPLAY shows the present day,

time, and operational information in a smaller font.

The menu tabs along the top of the screen are used to access the

SCHEDULE screen (for program setup) and the OPTIONS screen (to

access user/installer settings including, change to 24 hour clock,

change Fahrenheit to Celsius, set filter and service reminders, and

many other settings.

Equipment operation information appears in the boxes along the left

side of the home screen to indicate fan operation setting, cooling or

heating equipment operation setting, and whether or not scheduled pro-

gramming is ON or OFF. From these boxes, users can change the unit’s

mode to HEAT, COOL, AUTO (autochangeover − default), EM HEAT

(emergency heat for heat pump applications including dual fuel and HP

with Electric Heat), or OFF.

Also, the user can change the fan between ON (fan runs continuously

whether or not cool or heat equipment is running), AUTO (fan run time

controlled the schedule), or CIRC (circulate − user sets percentage of

fan run time).

The user can also decide whether or not to operate the unit per the pro-

grammable schedule, or in a non−programmable mode using the

SCHED box.

506061−01 06/08 Page 6

Controlling the Heat/Cool Modes of Operation

Press the screen anywhere − the first press turns on the backlight.

While in the HOME screen, press MODE field; repeated

presses scroll through all the modes. AUTO

(autochangeover) mode allows the thermostat to switch

between Heating and Cooling, whichever mode is dictated by

the indoor temperature. EM HEAT (emergency heat)

bypasses the first stage of heating (any stage[s] of heat pump

heating) and goes directly to the heat stage used for

maximum heating to more quickly warm a very cold house.

When the indoor temperature decreases or increases, the HEATING or

COOLING cycle will turn on based on the displayed mode. When the

HVAC system is on, the information display (shown in figure 3) will dis-

play one or several operational messages (listed in the table below). If

the outdoor sensor is connected, and is turned on in both installer and

user settings, outdoor temperature will be included in the displays. The

table below summarizes the information messages.

When the faults, errors, and service information displays appear, action

boxes will appear under the second line entries, REMIND, CLEAR,

SERVICE, or RESET. Press the box to perform the action.

Figure 3. Home Screen

Information Displays:

Faults, Errors, and Service Information Operating Information

TEMP SENSOR ERROR, MEMORY ERROR

CALL FOR SERVICE

Top line: fault/error

Bot. line: action

SET DATE/TIME

Default DATE/TIME (MON JAN 1 12:00 PM) [First time start up message]

NO OUTDOOR SENSOR

REMIND CLEAR SERVICE

Top line: fault/error

Bot. line: action

HEATING, COOLING, HUMIDIFYING, DEHUMIDIFYING,

SYSTEM OFF, OUTDOOR TEMP xxF, INDOOR RH xx%,

MON SEP 24 3:OO PM

Top line: operation messages

Bottom line: date and time

REPLACE: MEDIA FILTER; UV LAMP; HUM PAD; METAL INSERT

REMIND RESET

Top line: serv. req’d

Bot. line: action

SCHEDULE ON, SCHEDULE OFF, WAIT,

FAN ON, FAN CIRC

MON SEP 24 3:OO PM

Top line: add’l operation msgs

Bottom line: date and time

ROUTINE SYS CHECK−UP

REMIND RESET

Top line: serv. req’d

Bot. line: action

HOLD SETTING UNTIL PRESS SCHED TO

MON SEP 24 3:OO PM RESUME PROGRAM

[Alternating messages during

a held schedule]

NO OUTDOOR SENSOR, HUM SENSOR ERROR, HVAC ERROR DETECTED

REMIND SERVICE

Top line: fault/error

Bot. line: action

LOW BATTERY

REMIND

Top line:fault/error

Bot. line: action

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 7

Controlling the Fan Operation

Press the screen anywhere − the first press turns on the backlight.

From the HOME screen press FAN field; repeated presses

scroll through all the modes, AUTO, ON, and CIRC

(circulate).

Fan Modes

Fan Modes (ON, AUTO and CIRC) can be changed either from HOME

screen or from the SCHEDULE screen when programming the thermo-

stat. The three settings work like this:

SIf FAN mode displays AUTO on the HOME screen, this means

that FAN is following the schedule.

SIf FAN mode displays ON on the HOME screen, this means that

the fan is NOT following the schedule and that the fan will run con-

tinuously until it is changed from the HOME screen.

SIf FAN mode displays CIRC on the HOME screen, this means that

the fan is NOT following the schedule and that the fan will cycle

during periods of equipment inactivity. The cycle time is depen-

dant on user settings FAN CIRCULATE (Page 11).

If FAN mode displays AUTO (HOME) and ON or CIRC was selected

during scheduling for the current period, the thermostat will indicate the

current fan mode in the information display (FAN ON or FAN CIRC).

In the CIRC mode, the user can cycle the fan for a programmed

percentage of active time per hour, during periods of equipment

inactivity (i.e., heating or cooling equipment not running). The fan is ON

for 5 minutes at a time. The user may change the percentage of ON time

that the fan is on (see FAN CIRCULATE [Page 11]):

Fan Program

The user can program the fan to be ON, AUTO, or CIRC during a

program event period. While scheduling the event, if the fan is set to

ON, it will remain on during the entire event. If it is set to CIRC, it will

circulate during equipment inactivity per user programmable cycles

(see FAN CIRCULATE, Page 11). If set to AUTO, the fan will come on

with the equipment to serve the heating/cooling demand and go off

accordingly. Using the fan continuously or circulating the fan during the

occupied times may better improve the indoor air quality.

NOTE − When the HOME screen FAN mode is changed to ON or CIRC,

whatever was scheduled is ignored − the fan will either be ON or it will

CIRCULATE per the user−programmed intervals (USER SETTINGS −

FAN CIRCULATE (Page 11). When FAN − AUTO is selected in the

HOME screen, the schedule IS followed.

Controlling the Schedule

Press the screen anywhere − the first press turns on the backlight.

From the HOME screen press SCHED; repeated presses

toggle the schedule ON and OFF. If ON, the system follows

the program developed by the user (Page 8). If OFF, the

system operates as a non−programmable thermostatthe

user must make changes when desired. The

autochangeoverfeature will continue to operate based on the

manual user inputs.

506061−01 06/08 Page 8

Schedule ScreenProgramming

Press the screen anywhere − the first press turns on the backlight.

Press the SCHEDULE tab along the top of the screen. The display

changes to programming mode (figure 4) and shows the current set-

tings. The thermostat may be programmed for two or four (default)

events per day. The names for the events are: WAKE, LEAVE, RE-

TURN, and SLEEP. The selected time for an event to occur is based on

when you want the event to begin. Four events are common for work-

ing households.

WAKE PERIOD BEGINS

5:OOAM

Figure 4. Schedule Screen

Programmingmay be performed in groups of days (5/2 or all 7) or indi-

vidual days, as follows:

AMON TO SUN − allows every day to be set the same.

BMON TO FRI (weekday programming) and

SAT TO SUN (weekend programming).

CMONDAY through SUNDAY allows individual days of the

week to be programmed separately.

NOTE − After using one of the groups of days described above, the

program does allow you to subsequently change individual days to suit

your needs.

To select the groupings or individual days, scroll through the selections

pressing NEXT.

Programming Complexity

The programming process for groups of days or individual days is the

same, except in the amount of times required to go through the process.

Full WeekThe least complex program is the full week MON TO

SUN" program, wherein the events for every day of the week are the

same. This requires one time through the event programming process.

Work WeekNext in complexity to the full week program is the work

week program wherein the events are set for a typical work week (MON

TO FRI) and different events are set for the weekend (SAT TO SUN).

This requires two times through the events.

Day by DayMost complex because this requires going through the

programming process 7 times.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 9

Days & Events Programming process

Action Display shows...

1 Press SCHEDULE tab SCHEDULE screen

2 Press EDIT UP/DOWN arrows on right−hand

side of screen; EDIT changes to

CANCEL

3 Press NEXT to highlight the de-

sired grouping of days

Days change to match selected

group, e.g. MON TUE WED THU FRI

4 Press an event: WAKE (default),

LEAVE, RETURN, & SLEEP to

select for programming

Filled triangle above event

indicates which event is selected

for change

5 Press UP/DOWN arrows to

select desired temperature

After change is made, SAVE

appears in the bottom right−hand

of the screen

6 Press FAN repeatedly to select

desired fan mode

Fan indicator displays selection

(ON, AUTO, or CIRC)

7 Press UP/DOWN arrows to

adjust start time for

selected event

Information area displays start

time

8 Repeat steps 4 − 7 for all remaining events.

(If you selected other than MON TUE WED THU FRI SAT SUN), continue;

otherwise, skip to step 11.

9 Press NEXT for the next group

or the next day

Days change to match selected

group, e.g. SAT SUN

10 Repeat steps 3 through 8 for the remaining days, if necessary.

11 Press SAVE when all events and

days are programmed as desired

The changes are made and the

schedule screen reappears.

WAKE PERIOD BEGINS

5:OOAM

911

Figure 5. Programming days and events

506061−01 06/08 Page 10

Options screenReminders & User Settings

CLEAN button

When you select the OPTIONS tab, two buttons appear near the bot-

tom of the screen labeled CLEAN and ENTER. Press the CLEAN but-

ton to deactivate the touch" zones for 30 seconds. Clean the screen

with a soft cloth and a mild glass cleaning solution.

The Options screen provides user and installer access to the various

features for setup and access to the reminders.

REMINDERS

USER SETTINGS

Reminders [OPTIONS TAB > REMINDERS > [ENTER] ]

Set timers from 1 to 24 months in either calendar time or system run

time. Reminders appear when it is time to service the following (for

more details on REMINDERS, see Page 31):

REPLACE MEDIA FILTER

DUE FRI FEB 15 O8

REPLACE METAL INSERT

DUE SUN SEP 14 O8

REPLACE HUM PAD

DUE FRI FEB 15 O8

REPLACE UV LAMP

DUE THU SEP 14 O8

ROUTINE SYS CHECK−UP

DUE IN 216O HOURS

CUSTOM REMINDERS

DUE SUN APR 13 O8

User Settings [OPTIONS TAB > USER SETTINGS > [ENTER] ]

Press the OPTIONS tab; use the arrows to select USER SETTINGS.

Press ENTER.

USER SETTINGS

INSTALLER SETTINGS

The following items are available for modifying. Follow the instructions

for each parameter.

DATE/TIMESet month, day, year, hour, and minute using DATE/

TIME option. Select DATE/TIME; press ENTER. Small, filled up-arrow

is selected column; use up/down arrows to adjust; press box below

each small up-arrow to select each column. Adjust; press SAVE.

FEB 11 2OO8 12PM 49

MON DAY YR HR MIN

CANCEL||||||SAVE|

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