Lennox ComfortSense 7000 series Planungshandbuch

05/09 506229−01

*2P0509* *P506229-01*

E2009 Lennox Industries Inc.

Dallas, Texas, USA

STabbed user interface with

touch screen interaction

SHumidification measurement

and control

SSoft blue backlighted screen

with adjustable brightness

SProgrammable or

non−programmable options

SEquipment maintenance

reminders

SAutomatically changes

between heating cooling

HOMEOWNER’S MANUAL

ComfortSense®7000 Series

Model L7742U Touch Screen Programmable Thermostat

CONTROLS

506229−01

05/09

Supersedes 04/09

Table of Contents

ComfortSense

®7000 Series Model L7742U Thermostat 2. . .

Display Fields & Touch Screen Points 3. . . . . . . . . . . . . . . . . .

Home ScreenCurrent Conditions & Temperature Settings 4

Controlling the Heat/Cool Modes of Operation 5. . . . . . . . . . .

Controlling the Fan Operation 6. . . . . . . . . . . . . . . . . . . . . . . . .

Controlling the Schedule 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Options screenReminders & User Settings 9. . . . . . . . . . . .

Humidification 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dehumidification 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Humiditrol

®EDA Accessory 13. . . . . . . . . . . . . . . . . . . . . . . . . .

Temporary Temperature ChangePause the Schedule 14. . .

Remote Outdoor Sensor 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Memory Protection 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Litho U.S.A.

506229−01 05/09 Page 2

ComfortSense®7000 Series Model L7742U Thermostat

The ComfortSense®7000 Series Model L7742U thermostat is an elec-

tronic 7−day, universal, multi−stage, programmable, touch screen ther-

mostat. It also offers enhanced capabilities including humidification /

dehumidification / dewpoint measurement and control, Humiditrol®

EDA (Enhanced Dehumidification Accessory) control, and equipment

maintenance reminders.

SLarge, clear display with soft blue backlight shows the current and

set temperature, day/date/time, indoor relative humidity and out-

door temperature (if optional outdoor sensor is used).

SDehumidification measurement and control

SHumiditrol

®EDA capability

SDew point adjustment control

SMenu−driven programming guides user through the scheduling

process showing only necessary information on each screen.

SErgonomic design.

SSmooth Setback Recovery starts system early to achieve set-

point at start of program period.

SCompressor short−cycle protection (5 minutes).

SReal−time clock keeps time during power failures and automati-

cally adjusts for daylight savings time and leap year.

SMaintenancereminders let user know when to service or replace

filters, humidifier pads, ultraviolet lamps, plus two user or installer

defined custom reminders.

SProgram Hold options allow user to override the program sched-

ule as desired by time and date.

SSelect individual days or groups of days to set programming.

SProgrammablefan offers increased performance when combined

with whole home indoor air quality products.

SOutdoor temperature display (with optional outdoor sensor)

shows current outdoor temperature.

Your installer has set up your thermostat based on the type of heating

and cooling system and accessories that your thermostat connects to.

This booklet details user settings available to you that will give you as

much functionality and control as you want.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 3

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.

506229−01 05/09 Page 4

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.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 5

Controlling the 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 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, 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. Selecting Mode of Operation

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

506229−01 05/09 Page 6

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 10).

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 10]):

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 10). 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 10). When FAN − AUTO is

selected in the OPTIONS screen, the schedule IS followed.

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 10]):

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 7).

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.

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 7

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 10. 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.

506229−01 05/09 Page 8

Schedule ScreenProgramming

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

ComfortSensetModel L7742U Touch Screen 7−Day Programmable Thermostat

Page 9

Options Screen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 15):

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 9

BACKLIGHT INTENSITY Page 11

BACKLIGHT SETTING Page 11

COOLING LIMIT Page 11

DATE/TIME Page 9

DISPLAY INFO Page 10

EVENTS DAILY 2 OR 4 Page 10

F/C Page 9

FAN CIRCULATE Page 10

HEATING LIMIT Page 11

HUMIDITROL ADJUST Page 11

HUMIDITY SETTING Pages 11, 12, 13

SECURITY LOCK Page 11

VIEW CONTACT INFO Page 10

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

indicates 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|

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

506229−01 05/09 Page 10

Options tabUser Settings (continued)

EVENTS DAILY 2 OR 4default is 4; to change, scroll to EVENTS

DAILY 2 OR 4; press ENTER. Use arrows to change to 2; press SAVE.

EVENTS DAILY 2 OR 4

DEFAULT(4) 2

VIEW CONTACT INFOscroll to VIEW CONTACT INFO from the

user settings menu; press ENTER. Use BACK to return to menu. (To

set this to display on the home screen, see DISPLAY INFO.)

DISPLAY INFOcontrols what is displayed in the field below the tem-

perature and above the time on the HOME screen; it may display OUT-

DOOR TEMP, INDOOR RH (relative humidity), and CONTACT INFO

or any combination of the three, or none if all three are set to OFF.

Scroll to DISPLAY INFO; press ENTER. Use arrows to select OUT-

DOOR TEMP. INDOOR RH or CONTACT INFO; press ENTER.

DISPLAY INFO

OUTDOOR TEMP

INDOOR RH

CONTACT INFO

NOTE − When turning ON the OUTDOOR TEMP option OUT-

DOOR SENSOR REQUIRED" will display if the physical sensor

is not installed.

NOTE − If outdoor sensor is not present and if user tries to select the

options DISPLAY INFO −> OUTDOOR TEMP or HUMIDITROL a mes-

sage is displayed OUTDOOR SENSOR REQUIRED" instead of scroll

options for these menus. Information about installing the sensor is de-

scribed on Page 15.

For INDOOR RH, use arrows to select ON or OFF; then press SAVE.

INDOOR RH

DEFAULT(OFF) ON

For OUTDOOR TEMP, select ON or OFF; then press SAVE.

OUTDOOR TEMP

DEFAULT(OFF) ON

For CONTACT INFO, select ON or OFF; then press SAVE.

CONTACT INFO

DEFAULT(OFF) ON

FAN CIRCULATEAs an option to running the fan all the time, fan cir-

culate allows the user to decide how much the fan will run during peri-

ods of equipment inactivity. The fan ON time is always set to 5 minutes.

This option will cause the fan to come on more or less frequently. The

default is 35%; to change, scroll to FAN CIRCULATE; press ENTER.

Use arrows to change to 15, 25, or 45%; press SAVE.

FAN CIRCULATE

DEFAULT(35%) 25%

15% (9 minutes fan run time per hour)

25% (15 minutes fan run time per hour)

35% (21 minutes fan run time per hour)

45% (27 minutes fan run time per hour).

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