Lennox L7742U Owner's Manual
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Thermostat
  5. ComfortSense L7742U
  6. Owner's manual
Lennox L7742U Owner's Manual

Lennox L7742U Owner's Manual

Comfortsense 7000 series
Hide thumbs Also See for L7742U:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Programming Manual, Homeowner's Manual
Enlarged version
E2008 Lennox Industries Inc.
Dallas, Texas, USA
S Tabbed user interface with
touch screen interaction
S White backlighted screen
with adjustable brightness
S Equipment maintenance
reminders
06/08
*2P0608*
COOLING
S Humidification measurement
and control
S Programmable or
non−programmable options
S Automatically changes
between heating cooling
HOMEOWNER'S MANUAL
ComfortSenset 7000 Series
Model L7742U Touch Screen Programmable Thermostat
CONTROLS
506062−01
06/08
Supersedes 05/08

Table of Contents

ComfortSenset Model L7742U Thermostat
Display Fields & Touch Screen Points
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
®
Humiditrol
EDA Accessory
Remote Outdoor Sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Litho U.S.A.
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . .
506062−01
*P506062-01*
2
3
4
5
6
7
8
9
11
12
12
13
14
14

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the L7742U and is the answer not in the manual?

Questions and answers

Related Manuals for Lennox L7742U

Summary of Contents for Lennox L7742U

  • Page 1: Table Of Contents

    HOMEOWNER’S MANUAL ComfortSenset 7000 Series E2008 Lennox Industries Inc. Dallas, Texas, USA Model L7742U Touch Screen Programmable Thermostat CONTROLS 506062−01 Litho U.S.A. 06/08 Supersedes 05/08 Table of Contents ComfortSenset Model L7742U Thermostat ... . .
  • Page 2 ComfortSense Model L7742U Thermostat The ComfortSenset Model L7742U thermostat is an electronic 7−day, Compressor short−cycle protection (5 minutes). universal, multi−stage, programmable, touch screen thermostat. It also Real−time clock keeps time during power failures and automati- offers enhanced capabilities including humidification / dehumidification cally adjusts for daylight savings time and leap year.
  • Page 3 (autochangeover), OFF, EM HEAT (emergency heat) system the schedule (Page 7) and options (Page 9) sections for de- operations. tails. C FAN. Press to cycle through ON, CIRC (circulate), AUTO fan op- erations. ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 3...

  • Page 4: Tue Oct 23 1:15Pm

    Home Screen Current Conditions & Temperature Settings tings). Other system operational information, such as indoor relative humidity (if turned on in user settings), dehumidifying, cooling or heat- ing, will alternately be displayed in the information display. The home screen displays temperature and the temperature settings in large fonts.

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

    MON SEP 24 3:OO PM RESUME PROGRAM Bot. line: action a held schedule] NO OUTDOOR SENSOR, HUM SENSOR ERROR, HVAC ERROR DETECTED Top line: fault./error REMIND SERVICE Bot. line: action ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 5...

  • Page 6: Controlling The Fan Operation

    If FAN mode displays AUTO (HOME) and ON or CIRC was selected Controlling the Fan Operation during scheduling for the current period, the thermostat will indicate the current fan mode in the information display (FAN ON or FAN CIRC). Press the screen anywhere − the first press turns on the backlight. In the CIRC mode, the user can cycle the fan for a programmed From the HOME screen press the FAN field;...

  • Page 7: Controlling The Schedule

    To select the groupings or individual days, scroll through the selections Figure 4. Schedule Screen pressing NEXT. ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 7...

  • 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

    Set timers from 1 to 24 months in either calendar time or system run 12 OR 24 HOUR time. Reminders appear when it is time to service the following (for DEFAULT(12HR) more details on REMINDERS, see Page 14): ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 9...
  • Page 10 Options Screen Reminders & User Settings (continued) FAN CIRCULATE EVENTS DAILY 2 OR 4 default is 4; to change, scroll to EVENTS DEFAULT(35%) DAILY 2 OR 4; press ENTER. Use arrows to change to 2; press SAVE. 15% (9 minutes fan runtime per hour) EVENTS DAILY 2 OR 4 25% (15 minutes fan runtime per hour) DEFAULT(4)

  • Page 11: Humidification

    HUMIDITY SETTING is pressed (this Use up/down arrows to change the humidity setpoint (between 15 and setpoint adjust has NO effect on humidification): 45%); press SAVE. HUM SETPOINT DEHUM SETPOINT DEFAULT(45%) DEFAULT(5O%) ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 11...

  • Page 12: 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 SETTINGS ®...

  • Page 13: Temporary Temperature Change Pause The Schedule

    4. After saving, ON in the SCHED field flashes, and the information 1O:49AM OCT 1O display alternates between the following: HOLD SETTING UNTIL WKD MMM DD HH:MMMM PRESS SCHED TO RESUME PROGRAM Figure 6. Setting a Hold on the Schedule ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat Page 13...

  • Page 14: Service Reminders

    MUST be installed. on the time the specific output is ON (e.g. Fan output for Media Filter). In many applications, the ComfortSenset Model L7742U thermostat When the reminder time (either calendar time or run time) has elapsed, will display the temperature sensed by the remote outdoor sensor. With...

Table of Contents