Lennox ComfortSense 7000 series Homeowner's Manual
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Lennox ComfortSense 7000 series Homeowner's Manual

Comfortsense 7000 series touch screen programmable thermostat
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See also: User Manual
Enlarged version
E2009 Lennox Industries Inc.
Dallas, Texas, USA
S Tabbed user interface with
touch screen interaction
S Soft blue backlighted screen
with adjustable brightness
S Equipment maintenance
reminders
05/09
*2P0509*
S Humidification measurement
and control
S Programmable or
non−programmable options
S Automatically changes
between heating cooling
HOMEOWNER'S MANUAL
ComfortSense
Model L7742U Touch Screen Programmable Thermostat
CONTROLS
506229−01
05/09
Supersedes 04/09

Table of Contents

®
ComfortSense
7000 Series Model L7742U Thermostat
Display Fields & Touch Screen Points
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®
Humiditrol
EDA Accessory
Remote Outdoor Sensor
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7000 Series
Litho U.S.A.
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*P506229-01*
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Summary of Contents for Lennox ComfortSense 7000 series

  • Page 1: Table Of Contents

    HOMEOWNER’S MANUAL ® ComfortSense 7000 Series E2009 Lennox Industries Inc. Dallas, Texas, USA Model L7742U Touch Screen Programmable Thermostat CONTROLS 506229−01 Litho U.S.A. 05/09 Supersedes 04/09 Table of Contents ® ComfortSense 7000 Series Model L7742U Thermostat . . . Display Fields & Touch Screen Points .
  • Page 2 ® ComfortSense 7000 Series Model L7742U Thermostat ® The ComfortSense 7000 Series Model L7742U thermostat is an elec- Compressor short−cycle protection (5 minutes). tronic 7−day, universal, multi−stage, programmable, touch screen ther- Real−time clock keeps time during power failures and automati- mostat.
  • Page 3 Touch Screen Display C SCHED (schedule) − press to change between ON and OFF. D Displays room temperature. E Displays the current operation SET AT point(s). If MODE is set to AUTO (autochangeover), both HEAT and COOL setpoints are displayed. F Up/down arrows used for adjusting temperature up or down;...

  • Page 4: Home Screen Current Conditions & Temperature Settings

    Home Screen Current Conditions & Temperature Settings The HOME screen (figure 2) displays indoor temperature and outdoor temperature if 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.

  • Page 5: Controlling The Heat/Cool Modes Of Operation

    Controlling the Heat/Cool Modes of Operation On initial power up or after an a power loss over 2 When the faults, errors, and service information displays appear, dy- hours, the thermostat powers up at the HOME namic keys will appear under the second line entries, REMIND, screen in the AUTO position.

  • Page 6: Controlling The Fan Operation

    Controlling the Fan Operation Fan Modes 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]): If backlight is not on continuous, press the screen anywhere to turn on the backlight.
  • Page 7 Schedule tab Programming If backlight is not on continuous, press the screen anywhere to turn on Programming may be performed in groups of days or individual days, the backlight. Press the SCHEDULE tab along the top of the screen. as follows: The display changes to programming mode (figure 4) and shows the MON TO SUN −...

  • Page 8: Schedule Screen Programming

    Schedule Screen Programming Days & Events Programming process Action Display shows... Press SCHEDULE tab SCHEDULE screen Press EDIT UP/DOWN arrows on right−hand side of screen; EDIT changes to CANCEL Press NEXT to highlight the de- Days change to match selected sired grouping of days group, e.g.

  • Page 9: Options Screen Reminders & User Settings

    Options Screen Reminders & User Settings CLEAN button [ User Settings [ OPTIONS TAB > [CLEAN] OPTIONS TAB > USER SETTINGS > [ENTER] When you select the OPTIONS tab, two buttons appear near the bot- 12 OR 24 HOUR Page 9 Page 9 tom of the screen labeled CLEAN and ENTER.

  • Page 10: Fan Circulate

    Options tab User Setting (continued) EVENTS DAILY 2 OR 4 default is 4; to change, scroll to EVENTS For INDOOR RH, use arrows to select ON or OFF; then press SAVE. DAILY 2 OR 4; press ENTER. Use arrows to change to 2; press SAVE. INDOOR RH EVENTS DAILY 2 OR 4 DEFAULT(OFF)

  • Page 11: Backlight Intensity

    Options tab User Setting (continued) COOLING LIMIT This limits the temperature at which the thermostat BACKLIGHT INTENSITY default is 100%; scroll to BACKLIGHT IN- may be set for cooling (default is 50º); to change to any degree between TENSITY; press ENTER. Use arrows to change to 20 to 100% in 20% 45ºF and 90ºF, scroll to COOLING LIMIT;...

  • Page 12: Humidification

    Humidification BASIC & PRECISION if set up by the installer settings for BASIC or Scroll to HUMIDITY SETTINGS; press ENTER. Press the box below PRECISION, this adjustment controls the relative humidity (RH) be- HUMIDIFY. tween 15 and 45%. HUMIDITY MODE HUMIDIFY DEHUMIDIFY Scroll to HUMIDITY SETTINGS;...

  • Page 13: Dehumidification

    Dehumidification ® If your system is set up to control dehumidification, this adjustment con- Humiditrol Enhanced Dehumidification trols the relative humidity (RH) between 45 and 60%. Scroll to HUMID- Accessory (EDA) ITY SETTINGS; press ENTER. Press the box below DEHUMIDIFY. HUMIDITY MODE ®...

  • Page 14: Temporary Temperature Change Pause The Schedule

    Temporary Temperature Change Pause the Schedule Two types of temperature changes may be made: temporary (while in 5. After the 3 hours expires, the scheduled programming will re- sume, OR, press SCHED to cancel the hold. the SCHEDule ON mode) or permanent (while in SCHEDule OFF). Permanent Temperature Changes (schedule OFF −...

  • Page 15: Memory Protection

    Optional Remote Outdoor Sensor Service Reminders The outdoor sensor (X2658) may be required, especially when using The user may turn on and turn off the following service reminders (all of Humiditrol® EDA applications. In addition to measuring and displaying which default to OFF) in either chronological time and/or run time and outdoor temperature, the outdoor sensor provides dew point adjust- may be reset (to default) or delayed (snooze) at any time: ment and control for all models.

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Comfortsense l7742u

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