repeat this sequence three times. If the temperature still does not rise, it will continue to call for heat. This normally indicates the heating system is not working correctly. You may wish to consult your furnace manufacturer or service person.

The display will indicate CHECK STAT if one of the following occurs.

•One of the buttons is stuck down or in. Check buttons, make sure nothing is pushing them in.

•The thermostat sensor is not functioning. If using a remote sensor, check connections, wiring and power.

•The humidity sensor is not function- ing.

After checking the above, press PROGRAM RUN to reset the display. If this does not clear the display, disconnect power and remove the batteries for five minutes.

If these checks fail to solve the problem, the thermostat should be replaced.

Adjustable Humidity Display.

The room humidity display can be adjusted to read higher or lower by following the configuration menu and adjusting the humidity to a higher or lower value (up to 20% RH). The sensed humidity is calibrated at the factory. If you want to adjust it, refer to the CONFIGURATION section (page 19, step 14).

Humidifier

Maintenance Indicator.

This feature allows the thermostat to display the words CHCK HUMD (check humidifier) after a set time of humidifier operation. This is a reminder to maintain or clean your humidifier. The factory set interval for CHCK HUMD to be displayed is 100 hours of humidifier operation. This can

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be set anywhere from 0 to 1975 hours in 25 hour increments. A selection of 00 will cancel this feature.

When CHCK HUMD is displayed, you can clear it by pressing HUM/ FLTR SERVICE button. This resets the timer and starts counting the hours until the next humidifier maintenance.

The following steps will allow you to change the number of hours for humidifier maintenance.

1.If you see CHCK HUMD on the display, press the HUM/FLTR SERVICE button once to reset the timer. Also display will show SET HUMD TIME and will show the number of hours to humidifier maintenance.

2.Press TIME FWD or TIME BACK to change the time to your require- ments.

3.Press PROGRAM RUN to return to the normal operating mode.

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Emerson 1F97-391 operating instructions Adjustable Humidity Display, Humidifier Maintenance Indicator
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1F97-391 specifications

The Emerson 1F97-391 is a sophisticated, programmable thermostat designed to enhance comfort and efficiency in residential heating and cooling systems. With its sleek design and user-friendly interface, this thermostat stands out for those looking to upgrade their home climate control.

One of the main features of the Emerson 1F97-391 is its ability to be programmed for up to seven days. This allows users to set different temperature schedules for different days of the week, which is particularly useful for families with varying routines. The thermostat also boasts a large, backlit display that makes it easy to read temperature settings and other information, even in low-light conditions.

In terms of technology, the Emerson 1F97-391 is equipped with Smart Response technology, which learns your heating and cooling patterns and adjusts accordingly. This feature is designed to ensure that your home reaches the desired temperature by the time you're scheduled to arrive, optimizing energy efficiency. Additionally, the thermostat can be paired with Wi-Fi connectivity, allowing for remote access through a mobile app. This means users can adjust their home’s temperature from anywhere, ensuring comfort upon arrival.

Another significant characteristic of the Emerson 1F97-391 is its compatibility with a wide range of HVAC systems, including single-stage and multi-stage systems, heat pumps, and gas or electric furnaces. This versatility makes it an ideal choice for a variety of homes and setups.

Moreover, the thermostat features a built-in humidity sensor, providing users with not only temperature control but also the ability to monitor and manage indoor air quality. This is crucial for maintaining a comfortable living environment and can contribute to overall health and well-being.

The Emerson 1F97-391 also incorporates energy-saving functions such as Eco mode and built-in reminders for filter changes. These features help users maintain their systems efficiently while ensuring optimal performance over time.

In summary, the Emerson 1F97-391 is a modern thermostat offering programmable capabilities, advanced technology like Smart Response, and compatibility with various HVAC systems. It encompasses features focused on energy efficiency and user convenience, making it an excellent choice for anyone seeking to enhance their home’s climate control system.
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