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Lennox International Inc. l7742u - page 1
05/09 506229−01 *2P0509* *P506229-01* E 2009 Lennox Industries Inc. Dallas, T exas, USA S T abbed user interface with touch screen interaction S Humidification measurement and control S Soft blue backlighted screen with adjustable brightness S Programmable or non−programmable options S Equipment maintenance reminders S Automatically changes bet ...
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Lennox International Inc. l7742u - page 2
506229−01 05/09 Page 2 ComfortSense ® 7000 Series Model L7742U Thermost at Th e 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, Hu ...
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Lennox International Inc. l7742u - page 3
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 3 T ouch Screen Display A B C G I H F E D E Figure 1. T ouchscreen display Press the screen anywhere − the first press turns on the backlight. A Selection T abs − Press to select: HOME (normal display), SCHEDULE (for programming), OPTIONS (to set fan operation, al ...
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Lennox International Inc. l7742u - page 4
506229−01 05/09 Page 4 Home ScreenCurrent Conditions & T emperature Settings INFORMA TION DISPLA Y AREA COOLING TUE OCT 23 1:15PM Figure 2. Home Screen 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 ...
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Lennox International Inc. l7742u - page 5
ComfortSense t Model L7742U T ouch 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 MOD ...
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Lennox International Inc. l7742u - page 6
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 F AN mode control. Press F AN button; repeated presses scroll through all the modes, AUT O, ON, and CIRC (circulate). S AUTOthe fan is following schedule. S ON ...
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Lennox International Inc. l7742u - page 7
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 7 Schedule t abProgramming 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 DAIL Y 2 O R ...
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Lennox International Inc. l7742u - page 8
506229−01 05/09 Page 8 Schedule ScreenProgramming 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 TH ...
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Lennox International Inc. l7742u - page 9
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 9 Options ScreenReminders & User Settings CLEAN button [ OPTIONS T AB > [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 ...
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Lennox International Inc. l7742u - page 10
506229−01 05/09 Page 10 Options t abUser Setting s (continued) EVENTS DAIL Y 2 OR 4 default is 4; to change, scroll to EVENTS DAIL Y 2 OR 4; press ENTER. Use arrows to change to 2; press SA V E. EVENTS DAILY 2 OR 4 DEFAULT(4) 2 VIEW CONT ACT INFO scroll to VIEW CONT ACT INFO from the user settings menu; press ENTER. Use BACK to return to ...
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Lennox International Inc. l7742u - page 11
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 1 1 Options t abUser Setting s (continued) COOLING LIMIT This limits the temperature at which the thermostat may be set for cooling (default is 50º); to change to any degree between 45ºF and 90ºF , scroll to COOLING LIMIT ; press ENTER. Use arrows to change to d ...
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Lennox International Inc. l7742u - page 12
506229−01 05/09 Page 12 Humidification BASIC & PRECISION if set up by the installer settings for BASIC or PRECISION, this adjustment controls the relative humidity (RH) be- tween 15 and 45%. Scroll to HUMIDITY SETTINGS; press ENTER. Press the box below HUMIDIFY . HUMIDITY MODE HUMIDIFY DEHUMIDIFY | | Us e up/down arrows to change the humid ...
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Lennox International Inc. l7742u - page 13
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 13 Dehumidification If your system is set up to control dehumidification, this adjustment con- trols the relative humidity (RH) between 45 and 60%. Scroll to HUMID- ITY SETTINGS; press ENTER. Press the box below DEHUMIDIFY . HUMIDITY MODE HUMIDIFY DEHUMIDIFY | | Us e up/ ...
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Lennox International Inc. l7742u - page 14
506229−01 05/09 Page 14 T emporary T emperature ChangePause the Schedule T wo types of temperature changes may be made: temporary (while in the SCHEDule ON mode) or permanent (while in SCHEDule OFF). NOTE − If autochangeover is enabled at the time a temperature hold is invoked, the thermostat MA Y CHANGE OVER from heating to cooling and vice ...
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Lennox International Inc. l7742u - page 15
ComfortSense t Model L7742U T ouch Screen 7−Day Programmable Thermostat Page 15 Optional Remote Outdoor Sensor The outdoor sensor (X2658) may be required, especially when using Humiditrol® EDA applications. In addition to measuring and displaying outdoor temperature, the outdoor sensor provides dew point adjust- ment and control for all models. ...
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