1f72-151 Manual

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Cristhian Cinq-Mars

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Aug 3, 2024, 5:51:15 PM8/3/24

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FURNACES: Your model number may include a series of numbers or letters, but the manuals usually cover all models that begin with that series (i.e. G8T08012UH11A) and is generally located on a sticker, on an inside wall of your furnace or on the access doors.

HUMIDIFIERS: Some models have labels which indicate the model number, while others do not. If not, refer to your installation manual cover, or visit our Humidifiers page to match your model.

Many thermostats are always running a program, and you can adjust the times & temperatures (varies a lot, but typical is 4 changes per day x 7 days per week) but can't actually say "don't run any program". In that case you generally have two options:

Most thermostats I have worked with have a "override" or "hold" setting, typically by pressing & holding a particular button for a couple of seconds and then adjusting the temperature. In some cases, the "hold" is set & forget. In others, there are two "levels" of "hold" - temporary and permanent (but terminology may vary, or one may be "override" and one "hold", etc.). With a "temporary" hold, at the next program set time, the program resumes. With a "permanent" hold, the hold stays until you manually release the hold or change the thermostat mode (e.g., heat vs. cool).

I had a commercial customer years ago that wanted constant 72 degrees since their offices and/or warehouse were in nearly constant use (midnight to 7pm or longer) and they didn't want to worry about people coming in at different times and finding the place too hot or cold. But they also wanted the fan running all the time to keep from feeling "stale" when the ambient temperature didn't require much actual heating or cooling. But the fan would only run 1/2 the time (plus when the heating or cooling was actually running). The HVAC people couldn't figure it out.

It was actually quite simple. I read the poorly written manual and figured it out: The programs (which could not be turned off) alternated between occupied and unoccupied. In unoccupied mode, the fan would NOT run constantly, even if set as "On" instead of "Auto"! The solution was quite simple: I changed the times of the programs so that unoccupied was 2 15-minute chunks (smallest possible) at odd times of the day (so as to affect the fewest people). Problem solved.

If you have a White Rogers 1F78, returning it to manual is fairly simple. I just did it on ours. You must hold 3 buttons simultaneously: the time button, and both the up and down temperature arrows. Zeros will flash across the screen. Hold several seconds and when you release them, there will no longer be the time displayed and you will have returned to manual. You will no longer have the ability to display time on the screen. Hope this is helpful.