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 modesO, 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

TEMP SENSOR ERROR, MEMORY ERROR

Top line: fault/error

CALL FOR SERVICE

Bot. line: action

NO OUTDOOR

SENSOR

Top line: fault/error

CALL DEALER

INFO

Bot. line: action

 

 

REPLACE: MEDIA FILTER; UV LAMP; HUM PAD; METAL INSERT

Top line: serv. req’d

REMIND

RESET

Bot. line: action

ROUTINE SYS

CHECK−UP

Top line: serv. req’d

REMIND

RESET

Bot. line: action

NO OUTDOOR SENSOR, HUM SENSOR ERROR, HVAC ERROR DETECTED

Top line: fault/error

REMIND

SERVICE

Bot. line: action

DEALER INFORMATION (Edited to show dealer contact informa-

Contact

tion [2 lines])

Installing Dealer

Operating Information

SET

DATE/TIME

 

 

 

[First time start up msg]

Default DATE/TIME (MON JAN 1 12:00 PM)

 

HEATING,

COOLING,

HUMIDIFYING, DEHUMIDIFYING,

Top line: operation msgs

SYSTEM OFF, OUTDOOR TEMP xxF, INDOOR RH xx%,

 

MON

SEP

24

3:OO

PM

 

 

Bottom line: date & time

SCHEDULE ON, SCHEDULE

OFF, WAIT,

FAN ON, FAN CIRC

Top line: operation msgs

MON

SEP

24

3:OO

PM

 

 

Bottom line: date & time

HOLD

SETTING UNTIL

PRESS

SCHED TO

[Alternating msgs during

MON

SEP

24

3:OO

PM

RESUME

PROGRAM

a held schedule]

Page 5

ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat

Page 5
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Lennox International Inc comfortsense 7000 series touch screen programmable thermostat, l7742u Operating Information

l7742u, comfortsense 7000 series touch screen programmable thermostat specifications

Lennox International Inc. is renowned for its innovative heating, ventilation, and air conditioning (HVAC) solutions, and the ComfortSense 7000 Series Touch Screen Programmable Thermostat, model L7742U, stands as a testament to its commitment to energy efficiency and user-friendly design. This advanced thermostat combines cutting-edge technology with an intuitive interface, making it an ideal choice for homeowners looking to enhance comfort while managing energy costs.

One of the standout features of the ComfortSense 7000 Series is its large, easy-to-read, full-color touch screen display. This enables users to navigate the thermostat’s settings and programming options effortlessly. The interface is designed to provide clear visibility, even in low light conditions, ensuring that managing your home’s climate is straightforward at any time of day.

The thermostat allows for flexible programming, accommodating up to four separate time periods in a single day, which can be customized for heating and cooling settings. This programmable feature means users can optimize their HVAC usage according to their daily schedules, leading to potential energy savings and increased comfort when they need it most.

Another significant characteristic of the L7742U model is its compatibility with a wide range of heating and cooling systems. This versatility enables homeowners to integrate the thermostat with both conventional and advanced HVAC systems, including heat pumps and multi-stage units, which enhances its appeal across various applications.

The ComfortSense 7000 Series also includes smart features that allow for remote access. When connected to Wi-Fi, users can adjust their home’s temperature settings from their smartphones or tablets using the Lennox mobile app. This feature is particularly valuable for homeowners who want to make adjustments while away from home, ensuring that indoor conditions remain pleasant upon their return.

Moreover, the thermostat is designed with energy efficiency in mind. It utilizes advanced technologies, such as energy usage reports and reminders for regular maintenance checks, empowering users to take charge of their energy consumption. This can lead to reduced utility bills and a smaller environmental footprint.

In conclusion, the Lennox ComfortSense 7000 Series Touch Screen Programmable Thermostat, model L7742U, is a sophisticated yet user-friendly device that enhances the overall efficiency and comfort of home environments. Its advanced programming capabilities, smart technologies, and compatibility with various HVAC systems make it a smart choice for today’s energy-conscious homeowners. With Lennox’s commitment to quality, users can expect reliability and performance that meets the demands of modern living.