Lennox ComfortSense 5000 Series Programmable Touch Screen Thermostats

Table of Contents

• Thermostat Features

• Thermostat Display

• System Settings

• Fan Settings

• Program Your Heating and Cooling Schedule

• Fan Schedule

• Cancel a Schedule Period

• Set the Time

• Override Temperature Setting—Temporary Hold

• Override Temperature Setting—Permanent Hold

• Override Temperature Setting—Vacation Hold

• Temperature Recovery Feature

• Clean the Thermostat Screen

• Battery Replacement

• Reminder Timers

• Built-In Compressor Protection

• Outdoor Temperature

• Advanced Heat Pump Features (Select Models)

• Screen Lock

• Advanced Settings

• Troubleshooting Tips

Thermostat Features

• Large, clear display with backlight shows the current temperature, the current temperature setting and the time -- even in the dark.
• Menu-driven programming makes set-up effortless.
• Touch screen interaction.
• Real-time clock keeps time during power failures and automatically converts to daylight savings time.
• "Saving Changes" notification assures you that changes have been saved.
• Change / check reminders let you know when it is time to replace filters, UV lamps, batteries, etc.

Thermostat Display

The thermostat display shows various information and allows interaction via touch-sensitive buttons. Key elements include:

FAN Button:

Selects fan operation: AUTO, ON, or CIRC.

SYSTEM Button:

Selects system mode: HEAT, OFF, COOL, or EM HEAT (for heat pump systems).

UP ARROW:

Increases the temperature setting.

DOWN ARROW:

Decreases the temperature setting.

SCHED Button:

Select to enter the schedule programming mode.

HOLD Button:

Sets a permanent temperature hold or activates a vacation hold.

CLOCK Button:

Used to set the time forward or backward.

SCREEN Button:

Locks the touch screen for cleaning.

MORE Button:

Accesses reminders for furnace filter, UV light, or humidifier pad replacement.

Display Area:

Shows the current day of the week, inside temperature, set temperature, current time, outside temperature (if sensor is installed), and status indicators like "Following Schedule" or "RECOVERY".

System Settings

The system setting options depend on your heating and cooling type:

• HEAT: Thermostat controls the heating system.
• OFF: Both heating and cooling systems are off.
• COOL: Thermostat controls the cooling system.
• AUTO: The thermostat automatically switches between heating and cooling modes based on temperature.
• EM HEAT (Heat Pump Systems Only): Thermostat controls emergency and auxiliary heat if needed, when the heat pump compressor is not operational.

Fan Settings

The FAN setting can be programmed for ON, AUTO, or CIRC for each period selected:

• ON: Fan runs continuously for improved air circulation or central air cleaning.
• AUTO: Fan runs only when the heating or cooling system is active.
• CIRC: Fan runs randomly approximately 35% of the time, providing improved air circulation without continuous operation.

Fan Status Display: The home screen may show "AUTO" or "ON" to indicate the programmed fan setting.

Manually Override Scheduled Fan Setting: Press the FAN key, then select the desired fan setting to temporarily override the programmed schedule. The thermostat will return to the programmed operation at the start of the next schedule period.

Program Your Heating and Cooling Schedule

Your thermostat supports up to four schedule periods per day:

• Wake: Time for comfortable home temperature.
• Leave: Energy-saving temperature setting when away.
• Return: Time to return to a more comfortable temperature.
• Sleep: Energy-saving temperature setting during sleep.

Schedule times are set in 15-minute intervals.

Editing the Schedule:

1. Press the SCHED key.
2. Press the EDIT key to display the days of the week.
3. Select the desired days to edit (multiple days can be selected). Check marks will appear next to selected days.
4. Press the WAKE key.
5. Use the UP and DOWN arrows to adjust the time and temperature for the Wake period.
6. Press the LEAVE key and repeat step 5.
7. Press the RETURN key and repeat step 5.
8. Press the SLEEP key and repeat step 5.
9. Press the DONE key to save changes. A "Saving Changes" message will appear.
10. Repeat steps 1-9 for any remaining days of the week.

To exit without saving, press the CANCEL key.

Cancel a Schedule Period

To adjust your schedule for lifestyle changes (e.g., staying home all day), you can cancel specific periods:

1. Press the SCHED key.
2. Press the EDIT key.
3. Select the day(s) affected by the change.
4. Press the schedule period to cancel (WAKE, LEAVE, RETURN, or SLEEP). The selected period will flash.
5. Press the CANCEL key. The period's settings will disappear from the screen.
6. Press the DONE key.

A cancelled period can be reinstated by editing the schedule again.

Set the Time

1. Press the CLOCK key.
2. Use the UP and DOWN arrows to set the correct time.
3. Press the DONE key.

IMPORTANT: Ensure the current day of the week is displayed correctly. Refer to Advanced Settings if needed.

Override Temperature Setting—Temporary Hold

Temporarily override the programmed temperature until the next scheduled period or a specific time:

1. Use the UP or DOWN arrow next to the temperature display to set the desired temperature. The screen will show "Hold Temperature Until" and the start time of the next scheduled period.
2. Use the UP and DOWN arrows next to the time display to set when the thermostat should resume the schedule. (Arrows appear for approximately 7 seconds; press the time display to make them reappear).
3. Press CANCEL or SCHED to end the temporary hold. "Following Schedule" will appear on the screen.

Override Temperature Setting—Permanent Hold

Maintain a specific temperature indefinitely until the hold is cancelled:

1. Press the HOLD key. The screen will display "Permanent Hold".
2. Use the UP and DOWN arrows to set the desired temperature.
3. Press the CANCEL key to cancel the permanent hold and resume the schedule. "Following Schedule" will appear on the screen.

Override Temperature Setting—Vacation Hold

Override the programmed temperature for a designated number of days:

1. Use the UP or DOWN arrow next to the temperature display to set the desired temperature. The screen will show "Hold Temperature Until" and the start time of the next scheduled period.
2. Press the HOLD key twice. The screen will show "Hold Temperature Until" for one day.
3. Use the UP and DOWN arrows to set the number of days for the override. (Arrows appear for approximately 7 seconds; press the number of days display to make them reappear).
4. Press the CANCEL key to cancel the vacation override early.

When the vacation hold expires, the screen will display "Following Schedule".

Temperature Recovery Feature

This feature ensures your comfort by allowing the heating and cooling equipment sufficient time to reach your desired settings before a scheduled period begins. Recovery time varies based on local weather, your schedule, home construction, and equipment.

For example, if your WAKE period is set for 6:00 a.m. with a target of 70°F, the thermostat will activate heating in advance to reach 70°F by 6:00 a.m.

A "RECOVERY" notice is displayed when the system operates before the scheduled time.

Clean the Thermostat Screen

To clean the thermostat screen:

1. Press the SCREEN key. The touch screen will lock for 30 seconds.
2. Use a damp cloth slightly moistened with water or household glass cleaner. IMPORTANT: Do not spray liquid directly onto the thermostat; spray it onto the cloth first.
3. Repeat as necessary.
4. Press the DONE key to return to normal operation.

Battery Replacement

A low battery warning will flash on the home screen for approximately 30 days before batteries need replacement. It is recommended to replace batteries annually to prevent leakage and ensure power backup.

1. When the low battery indicator flashes, replace the batteries with three fresh AAA alkaline batteries.
2. To remove the thermostat, pull it straight out from the wallplate.
3. Remove the old batteries and insert three fresh AAA alkaline batteries, noting the polarity markings.
4. Align the terminal screw blocks with the pins on the back of the thermostat.
5. Push the thermostat straight onto the wallplate until it snaps into place.

Reminder Timers

The thermostat provides reminders for changing the furnace filter, humidifier pad, or ultraviolet lamp. When a timer expires, a "Change" reminder appears, and a reset key is displayed.

Reset Timers:

1. When the "Change" reminder appears, press the RESET key to restart the timer. If multiple timers expire simultaneously, press RESET until all have been reset.

View or Reset Timer Settings Before They Expire:

1. Press the MORE key until the desired timer appears.
2. Press the EDIT key to change the Timer Reload Value using the UP/DOWN arrows (refer to Advanced Settings for details).
3. Press DONE to return to the selected timer.
4. Press RESET to reset the timer to its reload value.
5. Press DONE or CANCEL to return to the home screen.

Built-In Compressor Protection

The thermostat includes a minimum-off timer to prevent the compressor from restarting too soon after a shutdown. If a demand for operation occurs during the delay, a "WAIT" message is displayed. Once the delay expires, the system will operate as indicated (e.g., "COOL ON" or "HEAT ON").

Outdoor Temperature

If an optional outdoor temperature sensor is installed, the outdoor temperature is displayed in the lower right corner of the home screen. If it's not displayed, press the MORE key until it appears.

Advanced Heat Pump Features (Select Models)

Some models used with heat pump systems and an outdoor temperature sensor offer additional features, such as compressor and back-up heat lockout based on the outside temperature.

Screen Lock

You can lock the thermostat's touch screen partially or fully. A "Screen Locked" message indicates this feature is active.

• Partially Locked Screen: Locks all keys except the temperature UP/DOWN arrows and the SYSTEM key. The "Screen Locked" message appears briefly when a locked key is pressed. Temperature adjustments are possible, but schedule settings are not. The temporary temperature change lasts until the next scheduled period. Press CANCEL to end the override.
• Fully Locked Screen: Locks all touch screen keys except the SYSTEM key, which allows access to user set-up options. The "Screen Locked" message is displayed continuously.

Advanced Settings

Your thermostat offers advanced settings to customize its operation. These are typically set by the installer but can be adjusted by the user. Refer to the User Set-Up table for details.

Accessing Advanced Settings:

1. Press and release the SYSTEM key.
2. Press and hold the center blank key for approximately five seconds until the screen changes.
3. Release the key when the display matches the example shown.
4. Use the UP/DOWN arrows and other keys as indicated in the User Set-Up table to make selections.
5. Press the DONE key to save settings.

Note on Daylight Savings: Thermostats manufactured from March 2006 onwards include settings for the 2007 daylight savings calendar. Setting 330 may need adjustment for areas using the revised DST calendar.

Key Advanced Settings:

• Date (Year/first, Year/last, Month, Day): Set the current date.
• Schedule Options: Choose between non-programmable or fully programmable 7-day scheduling.
• Temperature Display Scale: Select Fahrenheit (0) or Celsius (1).
• Daylight Savings: Enable automatic adjustment for DST (options for pre-2007 and 2007 DST calendars).
• Filter/Humidifier Pad/UV Lamp Reminders: Set run time intervals for reminders.
• Number of Periods: Configure for 2 (Wake, Sleep) or 4 (Wake, Leave, Return, Sleep) periods.
• Clock Format: Select 12-hour or 24-hour format.
• Screen Lock-Out: Configure screen locking options (unlocked, partially locked, fully locked).

Troubleshooting Tips

*Refer to Installation Instructions for access to Installer Set-Up procedures.