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Heat anticipator in a Honeywell T87 thermostat (C) Daniel Friedman at InspectApedia.comFAQs: How & Why to Adjust the Thermostat Heat Anticipator
Q&A ion Heat Anticipator Setting Numbers

Thermostat heat anticipator function & adjustment questions & answers.

What Should Be the Heat Anticipator Settings on a Room Thermostat?

This article series explains what a heat anticipator is on a wall thermostat, where to find it, what it looks like, how & why we adjust the heat anticipator, & what settings to use.

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Q&A on How & Why to Adjust the Heat Anticipator on a Room Thermostat

Datton 2E156 heating thermostat heat anticipator adjustment (C) InspectApedia.com TomThese questions & answers on settings for the thermostat heat anticipator were posted originally at HEAT ANTICIPATOR ADJUSTMENT - be sure to review the guidance found there.

Photo: heat anticipator in a Dayton 2E156 room thermostat cited by Tom below.

[Click to enlarge any image]

On 2019-03-22 by Anonymous

Our furnace comes on at a 4 degrees difference I want 2 what can I do to change it

Moderator reply:

Take a look at your thermostat and see if it includes an adjustable heat anticipator such as we discuss at HEAT ANTICIPATOR ADJUSTMENT OR post photos of the thermostat front cover and interior and we can comment further.

On 2019-02-25 by - (mod) - Dayton Room Thermostat Information & sources

Thanks for those excellent photos. More about Dayton thermostats is

at HEAT ANTICIPATOR THERMOSTAT SOURCES

and

at LINE VOLTAGE THERMOSTATS

On 2019-02-25 by Tom from Bethlehem Pa

Thanks! Thermostat in question is a Dayton 2E156. I did not find any direct info online about this model. Perhaps as old as the house, mid 70's.

I had touched it up with a bit of deoxit this fall. Ill be interested to see how sungle digit outside temps change the indoor temp swing but right now its less than 2 degrees. Ill post a couple and let you decide whats helpful.

Thanks again for the wisdom!

Dayton 2E 156 room thermostat heat anticipator adjustment (C) Inspectapedia.com Tom

 

Datton 2E156 heating thermostat heat anticipator adjustment (C) InspectApedia.com Tom

On 2019-02-24 by (mod) -

Tom

Nice going, and thanks for the feedback. It would be helpful to know the brand and model of the thermostats involved. Perhaps you could have attach a photo.

On 2019-02-24 1 y Tom from Bethlehem Pa

Thank you for sharing your expertise regarding thermostat setup. I live in a 1970's ranch house equipped with electric baseboard throughout.

Line voltage thermostats in the bedrooms provide consistent temperature but a large part of the house is controlled by an old Dayton low voltage thermostat that would allow a 5-6 degree temperature swing. Ive managed to adjust that down to 1.5-2 degrees. Much better!

On 2019-01-31 by (mod) -

Larry

please check out the three approaches to deciding on the thermostat heat anticipator settings given in the article above.

One of those three is a useful

Table of General Heat Anticipator Settings

That you could follow if you have no other information.

On 2019-01-31 17:14:39.500665 by Larry

What do you set the heat anticipater on a low pressure boiler? I think the brand is a Hydro

On 2018-12-09 12:20:09.523697 by (mod) -

I'm talking a bit beyond my expertise here so you should consider this an opinion only.

Ring we're discussing steam Heating and not hot water heating if there is an overshoot problem I would have dress that by installing the proper steam vents on the radiators. I might need an adjustable bed. That's because it may be but events are taking so long to vent air but the whole heating cycle is being extended. I also would look carefully at the thermostat location.

On 2018-12-08 13:53:44.118777 by Pat A

Not really. A few, but the boiler is a WM SGO3, with heating capacity of 354 SF of steam, and radiation sf is 218.

On 2018-12-08 04:32:14.937168 by (mod) -

I would expect the overshoot problem to be most serious if you have large cast iron hot water heating radiators. Is that the case? If so you might consider some thermostatically operated radiator valves

On 2018-12-07 19:19:10.384010 by Pat A

our house thermostat is a Honeywell T822D, and we recently added a Beckett Genysys 7505 as primary. The product has draw of .1amp, the lowest setting on thermostat is .18, which I now use as setting, yet there is overshoot, which has been the case even before new primary. Any suggestions.


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