Lennox l7742u - Manuals - manualsarea.com

Page 2 - ComfortSense

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 /...

Page 3 - Touch Screen Display; Press the screen anywhere − the first press turns on the backlight.

ComfortSense t Model L7742U Touch Screen 7−Day Programmable Thermostat Page 3 Touch Screen Display A B C G I H F E D E Figure 1. Touchscreen display Press the screen anywhere − the first press turns on the backlight. A Selection Tabs − Press to select: HOME (normal display), SCHEDULE (for programmin...

Page 4 - Home ScreenCurrent Conditions & Temperature Settings; COOLING; Figure 2. Home Screen

506229−01 05/09 Page 4 Home ScreenCurrent 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 outdoortemperature if the outdoor sensor is installed. Other system operationalinformati...

Page 5 - Controlling the Heat/Cool Modes of Operation; Figure 3. Selecting Mode of Operation; Operating Information

ComfortSense t Model 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 2hours, the thermostat powers up at the HOMEscreen in the AUTO position. If it powers up after apower loss of less than 2 hours...

Page 6 - Controlling the Fan Operation; Fan Modes; AUTOthe fan is following schedule.; Fan Program; Controlling the Schedule

506229−01 05/09 Page 6 Controlling the Fan Operation Fan Modes If backlight is not on continuous, press the screenanywhere to turn on the backlight. Press theOPTIONS tab to access the FAN mode control.Press FAN button; repeated presses scroll throughall the modes, AUTO, ON, and CIRC (circulate). S A...

Page 7 - Schedule tabProgramming; EVENTS DAILY 2 OR 4; Figure 4. Schedule Screen; Full Week

ComfortSense t Model L7742U Touch Screen 7−Day Programmable Thermostat Page 7 Schedule tabProgramming If backlight is not on continuous, press the screen anywhere to turn onthe backlight. Press the SCHEDULE tab along the top of the screen.The display changes to programming mode (figure 4) and shows ...

Page 8 - Schedule ScreenProgramming; Days & Events Programming process; Action; WAKE PERIOD BEGINS

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−handside of screen; EDIT changes toCANCEL 3 Press NEXT to highlight the de-sired grouping of days Days change to m...

Page 9 - Options ScreenReminders & User Settings; OPTIONS TAB; clockdefault is 12H to change, scroll to 12 OR 24

ComfortSense t Model L7742U Touch Screen 7−Day Programmable Thermostat Page 9 Options ScreenReminders & 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 d...

Page 10 - Options tabUser Setting; For INDOOR RH, use arrows to select ON or OFF then press SAVE.

506229−01 05/09 Page 10 Options tabUser Setting s (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; pr...

Page 11 - cooling

ComfortSense t Model L7742U Touch Screen 7−Day Programmable Thermostat Page 11 Options tabUser 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 between45ºF and 90ºF, scroll to COOLING LIMIT; press...

Page 12 - Humidification; if set up by the installer settings for BASIC or

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 belowHUMIDIFY. HUMIDITY MODE HUMIDIFY DEHUMIDIFY |...

Page 13 - Dehumidification; OFF; Humiditrol; If your system includes a Humiditrol

ComfortSense t Model L7742U Touch 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. HU...

Page 14 - Temporary Temperature ChangePause the Schedule; Temporary Temperature Changes (schedule ON); HOLD SETTING UNTIL; Figure 6. Setting a Hold on the Schedule

506229−01 05/09 Page 14 Temporary Temperature ChangePause the Schedule Two types of temperature changes may be made: temporary (while inthe SCHEDule ON mode) or permanent (while in SCHEDule OFF). NOTE − If autochangeover is enabled at the time a temperature hold isinvoked, the thermostat MAY CHANGE ...

Page 15 - Optional Remote Outdoor Sensor; In many applications, the ComfortSense; Memory Protection; Maintenance

ComfortSense t Model L7742U Touch Screen 7−Day Programmable Thermostat Page 15 Optional Remote Outdoor Sensor The outdoor sensor (X2658) may be required, especially when usingHumiditrol® EDA applications. In addition to measuring and displayingoutdoor temperature, the outdoor sensor provides dew poi...