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How do i operate a honeywell standard nonprogrammable t8400 digital thermostat?

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Posted on Aug 03, 2008

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What is the on/off temperature (heat) range for a RTH111 series


Heat range: 40 to 90 degrees F
Cool range: 50 to 99 degrees F
1 degree deadband

Here's the operation guide:
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2603EF.pdf

Please mark my answer as helpful.

Jan 05, 2015 | Honeywell Digital Manual Heat/Cool...

Tip

Honeywell TH8320U Thermostat


The Honeywell Vision Pro 8000 Digital Thermostat is a fully programmable thermostat that is so easy to use that you might think that it is reading your mind as you work with it.

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This intuitive logic responds to you as you program this thermostat and helps you to do what you wan to do. The instruction manual almost becomes a thing of the past. This thermostat also will learn your building and HVAC system. It then adjusts to keep your temperature within 1 degree F of the set point. This will give you the best in comfort. The comfort is achieved while still giving you the very best is efficiency. In some cases efficiency has been increased by up to 30% by simply installing this thermostat.

The fan can be programmed separately for increased comfort when running an electronic air cleaner or a humidifier. A 35% circulator mode is also available. Hold options will let you easily go on vacation or temporarily override the programmed settings. The vacation setting will even let you set it to go back to the schedule before you get home. There are also built in reminders for many of the things that need scheduled maintenance.

If you are thinking about or have a dual fuel set up or a heat pump furnace set up, then this is the thermostat for you. With the addition of an outdoor sensor you can set the thermostat to switch from one heat source to the other at whatever temperature you set.
This feature will eliminate the need for “change over kits” extra relays, etc… when you are setting up a system that has a backup heat source.

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This thermostat will also allow you to run it from the power of your HVAC system or run it on battery power. Just hook up the common wire and the thermostat will run off of your HVAC system. The changeover of the unit from A/C to heat can be programmed to be either manual or automatic. Scheduling of the program can be done in many different ways. You can decide between 1 day, 7 day, 5+2, or 5+1+1, day. Four periods, 2 periods per day or nonprogrammable are all options also.

The keyboard can be locked completely or partially. With the purchase of additional sensors you can wire up remote indoor sensors. These can also be wired to average the temperature is you want to sample the temperature from more than one place. An outdoor sensor can be installed so that you can see from your thermostat the outdoor temperature.

A five year manufacturers warranty is standard and you will also get a thermostat that has earned the energy star rating.

http://www.fixya.com/support/r3869033-replacing_thermostat


http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

on Jan 18, 2010 | Air Conditioners

1 Answer

We have just bought a house in Canberra with a Honeywell Thermostat to operate gas central heating system. There is no manual and we do not know how to programme it. I would guess that it is about 10 years...


I have put many of those in and yes, they are hard to program compared to the new ones. You will probably not find any instructions unless you go on line to honeywell and ask. Otherwise it may be worth your time and less head ache to just go get a new thermostat even the ones at Home Depot are a lot easier.

Apr 08, 2011 | Honeywell Air Conditioners

1 Answer

How can I unlock this th


Remove the thermostat from its base and replace the batteries. To remove the thermostat, grasp it at the edges and pull toward you. The batteries are on the back of the thermostat housing.

Read more: How do I Unlock the Digital Display on a Honeywell RTH8500 Thermostat? ' eHow.com http://www.ehow.com/how_7267447_do-display-honeywell-rth8500-thermostat_.html#ixzz17KTxLwBU

Dec 05, 2010 | Honeywell Air Conditioners

1 Answer

My digital Honeywell thermostat quit working. no visuals on the digital screen....


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can't find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Sep 23, 2010 | Honeywell Air Conditioners

1 Answer

Hi, I have a Honeywell Thermostat T8400 (non-programmable.) The screen is blank and will not come back on. I've unplugged it from the wall and turned the electricity off and on in an effort to reset it. It...


if you thermostat doesnt use batteries and it has no power, that means there is a problem with the air conditioing system itself. 90% of the time it is a safety switch such as a float switch (drainage problem), which cuts the power to the system to prevent damage to your house from condensate water leakage or just further damage to the system itself. Call the a/c guys, this is going to require expertise.

Oct 09, 2009 | Honeywell Air Conditioners

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