Lennox ComfortSense L7742U Guide de l'utilisateur

05/09 506228−01

*2P0509* *P506228-01*

E2009 Lennox Industries Inc.

Dallas, Texas, USA

Shipping and Packing List

1 − ComfortSense

®Model 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

ComfortSense®7000 Series

Model L7742U Touch Screen Programmable Thermostat

CONTROLS

506228−01

05/09

Supersedes 04/09

IMPORTANT

Read this manual before programming the thermostat.

Use this thermostat only as described in this manual.

IMPORTANT

In all applications, the ComfortSense®Model L7742U thermo-

stat can only be used with all residential units and approved

commercial split-system matches, and those which meet the

following installation criteria:

Sinstallation uses 18 GAUGE thermostat wire or larger,

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

Sload from any thermostat connection is 1 AMP or LESS.

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

tion Note H−04−5.

Litho U.S.A.

506228−01 05/09 Page 2

Table of Contents

ComfortSense

®Model L7742U Thermostat 3. . . . . . . . . . . . .

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

Touch Screen Display 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Home ScreenCurrent Conditions & Temp. Settings 5. . . . .

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

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

Controlling the Schedule 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Schedule TabProgramming 8. . . . . . . . . . . . . . . . . . . . . . . . .

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

Options TabInstaller Settings 13. . . . . . . . . . . . . . . . . . . . . . . .

Resetting Program to Factory Conditions 16. . . . . . . . . . . . . . .

EPA ENERGY STAR®Recommended Setpoints 17. . . . . . . . .

Humidification 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dehumidification 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Humiditrol

®Enhanced Dehumidification Accessory (EDA) 22.

Stage Delay and Differential Settings 24. . . . . . . . . . . . . . . . . . .

Temporary Temperature Change (Pausing the Schedule) 31. .

Optional Remote Outdoor Sensor 32. . . . . . . . . . . . . . . . . . . . . .

Service Reminders 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Part and Serial Numbers 33. . . . . . . . . . . . . . . . . . . . . . . . .

Memory Protection 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A. Flow Diagrams & Wiring Diagrams 34. . . . . . . . . .

Appendix B. Diagnostic Info. & Available System Settings 39.

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.

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.

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.

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 thermostat for shipping damage. If you find any damage, imme-

diately contact the last carrier.

Page 3 ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

ComfortSense®Model L7742U Thermostat (Catalog No. Y2081)

Description

The ComfortSense®Model L7742U thermostat is an electronic 7−day

universal multi-stage programmable touch screen thermostat. It also

offers enhanced capabilities which include:

Shumidification measurement and control,

Sdew point adjustment control,

Sdehumidification measurement and control,

SHumiditrol

®Enhanced Dehumidification Accessory (EDA) capa-

bility,

Sequipment maintenance reminders,

Sworry−free memory storage feature,

Smenu−driven display.

This thermostat supports heat pump units or non−heat pump units, with

up to 4 stages of heating (dual fuel units) and 2 stages of cooling.

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

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.

Outdoor Temperature Sensor

An outdoor temperature sensor (X2658) is required for dual fuel ap-

plications, balance points, dew point humidity control, and with Humidi-

trol®EDA.

In addition to measuring and displaying outdoor temperature, the out-

door sensor provides dew point adjustment and control for all models. If

used with this thermostat, the sensor enables optimal heating equip-

ment 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 can be dis-

played 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 outdoor

equipment fault by displaying HVAC ERROR DETECTED" when one

of the following conditions exist:

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

for 5 minutes (units without LSOM, but which use Service Light

Monitor Kit), OR,

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

vated for 5 minutes.

NOTE − The L input is used for diagnostic information purposes only, it

is not intended to provide equipment protection.

506228−01 05/09 Page 4

Touch Screen Display

Figure 1. Touchscreen display

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

A Selection Tabs − Press to select: HOME (normal display),

SCHEDULE (for programming), OPTIONS (to set fan operation,

alerts, service reminders, and other user and installer settings).

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

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

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

DDisplays room temperature.

EDisplays the current operation SET AT point(s). If MODE is set to

AUTO (autochangeover), both HEAT and COOL setpoints are

displayed.

FUp/down arrows used for adjusting temperature up or down; if in

AUTO (autochangeover) mode, two sets of up/down arrows ap-

pear.

GInformation display area, displays different information depending

on the tab selected:

DHOME tab: displays outdoor temperature (if outdoor sen-

sor X2658 is installed), indoor relative humidity (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.

HSchedule time adjustment, User/Installer Settings up/down ar-

rows:

DHOME screen: not visible except when executing a HOLD

SETTING)

DSCHEDULE and OPTION screens: used to adjust sched-

ule and option settings.

IDynamic keys − not visible in HOME screen unless executing a

HOLD SETTING. For SCHEDULE and OPTIONS settings, these

keys appear and change depending on the selection. See the

schedule and options sections for details.

Page 5 ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

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

temperatureif the outdoor sensor is installed. Other system operational

information,such as indoor relative humidity (if turned on in user set-

tings), dehumidifying, cooling or heating, will alternately be displayed in

the information display.

Equipment operation information appears in the boxes along the left

side of the home screen to indicate cooling or heating equipment opera-

tion setting, and whether scheduled programming 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.

The user can also decide whether to operate the unit per the program-

mable schedule, or in a non−programmable mode using the SCHED

box.

506228−01 05/09 Page 6

Controlling Heat/Cool Modes of Operation

On initial power up or after an a power loss over 2

hours, the thermostat powers up at the HOME

screen in the AUTO position. If it powers up after a

power loss of less than 2 hours, it assumes the last

mode set. Pressing MODE repeatedly scrolls

through all the modesAUTO, EM HEAT, COOL,

HEAT, then back to OFF.

HEAT, COOL and OFF modes are as each name implies. AUTO

(autochangeover) 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 AREA (shown in fig-

ure 3) will display one or several operational messages (listed in the

table below). If the outdoor sensor is connected and is turned on in 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, dy-

namic keys will appear under the second line entries, REMIND,

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

INFORMATION DISPLAY AREA

Figure 3. Home Screen

Information Display Area table

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 msg]

NO OUTDOOR SENSOR

CALL DEALER INFO

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 msgs

Bottom line: date & 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: operation msgs

Bottom line: date & 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 msgs during

a held schedule]

NO OUTDOOR SENSOR, HUM SENSOR ERROR, HVAC ERROR DETECTED

REMIND SERVICE

Top line: fault/error

Bot. line: action

DEALER INFORMATION (Edited to show dealer contact informa-

tion [2 lines])

Contact

Installing Dealer

Page 7 ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Controlling the Fan Operation

Fan Modes

If backlight is not on continuous, press the screen

anywhere to turn on the backlight. Press the

OPTIONS tab to access the FAN mode control.

Press FAN button; repeated presses scroll through

all the modes, AUTO, ON, and CIRC (circulate).

SAUTOthe fan is following schedule.

SONthe fan is NOT following the schedule and runs continuously

until it is changed from the OPTIONS screen.

SCIRCthe fan is following schedule and cycles during periods of

equipment inactivity. Cycle time is dependent on user settings

FAN CIRCULATE (Page 11).

If FAN mode displays AUTO 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.

NOTE − When the OPTIONS 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 OPTIONS screen, the schedule is followed.

Controlling the Schedule

If backlight is not on continuous, press the screen

anywhere to turn 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 autochangeover feature

continues to operate based on the manual user inputs.

The fan mode is displayed on the SCHEDULE screen when program-

ming the thermostat and can be changed only during schedule editing

(after EDIT is pressed). Fan settings in OPTIONS screen will OVER-

RIDE the scheduled fan operation.

506228−01 05/09 Page 8

Schedule tabProgramming

If backlight is not on continuous, press the screen anywhere to turn 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 settings.

EVENTS DAILY 2 OR 4The thermostat may be programmed for two

or four (default) events per day. The names for the events are: WAKE,

LEAVE, RETURN, and SLEEP. The selected time for an event to occur

is based on when you want the event to begin. Four events (default) are

common for working households. To change to two events per day, see

page 11. When set for two events per day, the display would appear as:

WAKE (or SLEEP) PERIOD BEGINS".

WAKE PERIOD BEGINS

5:OOAM

Figure 4. Schedule Screen

Programmingmay be performed in groups of days or individual 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 allows you to subsequently change individual days to suit your

needs.

To get to the different groupings of days, press EDIT, then press NEXT

repeatedly to scroll to the desired grouping.

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.

Page 9 ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Schedule tabProgramming (continued)

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

506228−01 05/09 Page 10

Options tabReminders/User Settings

CLEAN button [OPTIONS TAB > [CLEAN] ]

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 33):

REPLACE MEDIA FILTER

DUE FRI JUN 12 O9

REPLACE UV LAMP

DUE FRI SEP 11 O9

ROUTINE SYS CHECK−UP

DUE IN 216O HOURS

PURE AIR MAINTENANCE

DUE FRI SEP 11 O9

REPLACE HUM PAD

DUE FRI JUN 12 O9

(CUSTOM REMINDER 1)

DUE WED OCT 21 09

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

12 OR 24 HOUR Page 10

BACKLIGHT INTENSITY Page 12

BACKLIGHT SETTING Page 12

COOLING LIMIT Page 12

DATE/TIME Page 10

DISPLAY INFO Page 11

EVENTS DAILY 2 OR 4 Page 11

F/C Page 10

FAN CIRCULATE Page 11

HEATING LIMIT Page 12

HUMIDITROL ADJUST Page 12

HUMIDITY SETTING Pages 12, 20, 22

SECURITY LOCK Page 12

VIEW CONTACT INFO Page 11

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

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

FEB 11 2OO9 12PM 49

MON DAY YR HR MIN

CANCEL||||||SAVE|

F/Cdefault is Fahrenheit; to change to Celsius, scroll to F/C; press

ENTER. Use arrows to change to C; press SAVE.

F OR C

DEFAULT(F) F

12 OR 24 HOUR clockdefault is 12H; to change, scroll to 12 OR 24

HOUR; press ENTER. Use arrows to change to 24H; press SAVE.

12 OR 24 HOUR

DEFAULT(12HR) 12H

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