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Circa (1986-1994) Honeywell Chronotherm T8082 12-30V Single Stage Heating and Cooling thermostat equipped with a single mercury switch. See video for information: Any other questions- please ask.

Thermostat heat anticipator function & adjustment guide.

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

Tthis article 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.

We list the recommended heat anticipator settings.

We explain how to test the heat anticipator on a thermostat, and we describe the conditions necessary for a heat anticipator on a room thermostat to work properly in the first place. We also explain the difference between the job of the thermostat heat anticipator and the differential settings on a heating system aquastat or similar control.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

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

What is a thermostat heat anticipator?

The purpose of a thermostat heat anticipator is to 'de-sensitize' the thermostat so that when actual room temperature is hovering close to the set temperature on the thermostat, the thermostat switch won't keep switching the air conditioner or heating system on and off too often - which can damage the equipment.

Properly adjusted a heat anticipator also prevents the room from getting warmer than the thermostat set temperature, and it prevents the heat from shutting off before the room has reached the thermostat set temperature.

In our photo you can see our pointer hovering over fine nichrome wire wound around a triangular piece of plastic (forming a variable heating element) and you can see at center of the photo a flat copper arm which can be moved to slide a contact to different positions along the wound variable resistor.

The triangular pointer on the copper arm in my photo has an opening which helps read the exact position to which the heat anticipator has been set.

[Click to enlarge any image]

Behind the pointer you can see a silver scale with different amp readings which are explained below. Inserting a small tool or pencil point into the open copper triangle allows sliding the antipator lower towards higher or lower numbers.

On this Honeywell T87F heat anticipator scale settings range from 0.10 to 1.2 Amps.

As you'll read in these articles, other thermostat heat anticipators may use different ranges of Amps and many modern digital and programmable thermostats don't use a heat anticipator at all.

The heat anticipator scale:

If you click to enlarge the photo above you can see the amperage level to which this heat anticipator had been set when we took this picture.

Which Way Do I Move the Heat Anticipator Adjustment?

A Honeywell T87 heat anticipator sketch is shown here.

[Click to enlarge any image]

Adjusting the anticipator up or down to higher or lower Amps numbers will lengthen or shorten the heat-on or cooling-on cycle.

Watch out: unless you are having a problem with the thermostat's behaviour, don't fool with the heat exchanger - leave it as it was set by the installer.

But if your heating system is oscillating or 'seeking' and flipping the heat (or air conditioner) on and off when room temperature gets close to the thermostat set temperature

OR if heat-on cycles run too long, overheating the room above the thermostat set temp

OR if heat cycles too short and don't bring the room up to the thermostat set temp

THEN yes - the heat anticipator might enjoy being adjusted more properly and you might enjoy the result.

Lower numbers on the Amps scale give a shorter heat-on cycle

The shortest burner-on time will be when the heat anticipator puts out the most heat. This warms up the thermostat's room temperature sensor and therefore tells the thermostat the room is up to set temperature earliest.

Higher numbers on the Amps scale give a longer heat-on cycle

The longest burner-on time will be when the heat anticipator puts out the least heat, thus does not turn off heat early, thus lets the burner keep running longer .

Honeywell Thermostat Instructions Chronot…

Really? So why the heck do we see the word 'LONGER' at the lower-number end of the heat anticipator scale on some thermostats like the T87?

I think that's where there was room to stamp the word 'LON GER' into the steel. But look again more-closely at that arrow inside our red circle.

Notice that ARROW under LONGER? It is pointing to the left towards higher numbers on the scale.

At higher numbers the heat anticipator draws less current so the little heating wire heats up less so the heating system will run longer.

Honeywell's word LONGER and arrow pointing towards higher numbers on the Amps scale tells us that moving the pointed to the left to a higher number should give LONGER HEAT ON time or LESS heat heating of the heat anticipator.

Why?

Take a closer look at the flat-wound nichrome wire heat anticipator and the path of current flow.

When the pointer is towards the right - lower - towards the 0.1A end of the scale, more current flows through the length of nichrome wire - providing more heat output at the heat anticipator, thus a shorter burner-on time. (Jaffe 1997)

When the pointer is moved towards the left - higher - towards the 1.2A end of the scale, less current is flowing - providing less heat output at the heat anticipator thus a longer burner-on time.

SlantFin: Another Heat Anticipator Example

A less-confusing illustration of a heat anticipator is this SlantFin thermostat - actually manufactured by Honeywell.

Rather than a wind of wire around a triangular carrier (as inthe T87 above) the SlantFin thermostat heat antipator is a single strand of nichrome wire is bent into a circular shape.

In our photo you'll see that the word LONGER includes an arrow pointing to HIGHER amp readings.

At the lower (shorter heat-on) end of the scale is .18A and at the higher (longer heat-on) end of the scale is 0.8A.

Current flow is through the rivet in the center of the metal pointer, along the length of the metal pointer to its point of contact on the nichrome wire, and then through the nichrome wire to that solder blob that connects the .8A end of the heat anticipator-heater to the white wire.

The longest heating cycle or heat-on at this thermostat will at the 0.8A current (Amps) end of the scale. The thermostat's bimetalic spring room temperature sensor (behind the white dial) won't be getting much extra warmth from the heat anticipator.

The shortest heating cycle or heat-on time at this SlantFin thermostat should be at the 0.18 end of the scale - more heat from the heat anticipator, more pre-warming of the bimetallic spring, earlier heat-off.

Watch out: on most heat anticipators there will be both an Amps Scale (initially set to match the measured amperage of the thermostat circuit) AND an arrow telling you which way to move the pointer for a longer heat-on cycle.

Don't simply trust 'left or right' on your thermostat - read the scale and notice the arrow. .

Honeywell Chronotherm 3 Troubleshooting

Depending on your model thermostat and where the heat anticipator is found, left and right or up and down might be reversed from the images here, and some of the thermostat heat anticipators we examined have only a numeric scale, no arrows, so it's important to follow the manufacturer's instructions.

Below we provide specific heat anticipator setting recommendations as well as a description of which way to move the heat anticipator lever to change the thermostat's behavior to address room temperature overshoot. You will see that Honeywell's own instructions contradict one another depending on the thermostat model.

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

If your heating system seems to be working OK, without excessive burner on-off cycling and without troubling room temperature overshoot, leave the heat anticipator alone.

If however you are an installer and want to precisely set up the heat anticipator on a thermostat (if your thermostat has this feature), there are three ways you can choose the initial Amps setting.

The initial settings are intended simply to make sure that we don't send too much or too little current (amps) through the little heating coil or wire that comprises the heat anticipator.

Later we can fine-tune the heat anticipator by setting it further up or down if the room temperature at the end of the heat-on cycle is overshooting (heat is on too long) or under-shooting (heat is not on long enough) the thermostat setting.

1. Use the manufacturer's recommended thermostat heat anticipator settings based on printed control circuit data.
   The heat anticipator Amps setting should be set to match the current (Amp) rating stamped on the name plate of the primary control that the thermostat is controlling.
   Below on this page
   at ANTICIPATOR SETTINGS by HEATING CONTROL
   we give a table of heat anticipator settings recommended by Honeywell or another manufacturer.
2. Set the heat anticipator according to the Type of Heating System
   Below we include our version of Honeywell's
   ANTICIPATOR SETTINGS by HEATING SYSTEM TYPE
3. Actually measure the thermostat circuit's current and set the heat anticipator to match that level.
   Details of how to use a mini ammeter to actually measure the heating system control circuit amps are in our separate article found
   at HEAT ANTICIPATOR SET & TEST by AMMETER.

Our sketch above, adapted from a Flair APVO2 two-wire thermostat whose the heat anticipator level and scale (red arrow) on the left side of the device.

Interestingly the company referred to this as a 'fixed anticipation' thermostat, but its installation instructions indicated a screw-secured heat anticipator pointer and an amperage scale on the device.

This thermostat was designed for use with zone valves or damper actuators.

Set the Heat Anticipator Based on Type of Heating System

Notes to the table above - fine tuning the heat anticipator

Forced warm furnaces continue to blow warm air for a minute or so after the thermostat stops calling for heat - in a purge heat from the furnace heat exchanger.

Steam heat radiators have thermal mass and in my OPINION also tend to overshoot the thermostat set temperature but the presumption of the table above is that they don't.

1. Heat on too long: If the furnace stays on beyond the set temperature on the thermostat, move the heat anticipator
DOWN by 0.1 A - lower number = shorter heat-on cycle

Watch out: if you set the heat anticipator too low that causes too much current to flow through the heating coil and will creat too much heat inside the thermostat, shutting the system down too early - before the living space actually comes up to temperature.

This can lead to service calls complaining that the heat never reaches the thermostat set temperature. (Jaffe 1997 cited in REFERENCES)

Honeywell Dial Set Chronotherm Manual Muscles

2. Heat cycle too short: if the furnace shuts off before the set temperature on the thermostat has been reached, move the heat anticipator pointer
UP by 0.1A - higher number = longer heat-on cycle

Watch out: if you set the heat anticipator too high the heat anticipator doesn't draw enough current to heat up, so the heating system shuts off too late - the room overheats.

This too can lead to service calls complaining of overheating beyond the thermostat setting. (Jaffe 1997)

3. Additional heat anticipator settings and details are usually provided on the thermostat installation pamphlet provided by the manufacturer.

Watch out: Honeywell, in instructions for its CT87A,B,J Round Thermostat warns: Never adjust the heat anticipator below 0.3A

Also see HEAT ANTICIPATOR ADJUSTMENT - T87 for more details about how that thermostat heat adjuster is set and why.

Set the Heat Anticipator by Heater Primary Control Amps

Notes to the table above

Additional heat anticipator settings and details are usually provided on the thermostat installation pamphlet provided by the manufacturer.

The settings shown here are not likely to be correct for other brands or models of thermostats.

Use a Mini- Ammeter to Set & Test the Heat Anticipator

Watch out: as Honeywell warns thermostat installers:

This thermostat has an adjustable heat anticipator and will operate properly only if this [heat anticipator resistor type] tiny in-thermostat heater is adjusted to match the current of the valve or relay.

Set the heat anticipator to the heating boiler or furnace manufacturer's recommendation,

or if you don't know that number, you can either leave the heat anticipator at its factory setting (recommended) or you can use the heat anticipator setting table above, or finally, you can use a mini-ammeter to actually measure the heating thermostat circuit and to fine tune the heat anticipator setting, as we discuss in detail

at HEAT ANTICIPATOR SET & TEST by AMMETER

For a detailed explanation of how the thermostat heat anticipator actually works

see HEAT ANTICIPATOR OPERATION.

I've searched some older threads and have seen that some of the 5 digit serial numbers that start with 4's are from the 1960s and those with 7's are from. Stubben with the serial number and they told me their computerized records didn't go back that far, so they couldn't tell me the exact age of my saddle. Attaching the billets. The first 2 billets on each side are hand stitched to the webbing that was left long. Billet guards that have been stamped with the model, serial number, and tree width, will be attached later.

Manufacturers of Room Thermostats Including a Heat Anticipator

This has moved to HEAT ANTICIPATOR THERMOSTAT SOURCES

What if my Thermostat Does Not Have a Heat Anticipator? Do I need one?

Well you may not need a heat anticipator in your thermostat.

As we discuss in detail at HEAT ANTICIPATOR THERMOSTAT SOURCES, for many types of heating system distribution, heat source, and heat controls, you don't need a heat anticipator, while for certain types of heating systems (such as those using heavy cast iron radiators) using a heat anticipator can provide important improvements in heating system operation.

Where can I buy a room thermostat that has a heat anticipator? Big box stores don't carry thermostats that include a heat anticipator

This discussion moved to HEAT ANTICIPATOR THERMOSTAT SOURCES

The question of whether or not you need or should want a thermostat that includes a heat anticipator feature is discussed

at DO I NEED a THERMOSTAT with a HEAT ANTICIPATOR?

Heat Anticipator Adjustment 101: Simplified anticipator operation, setting, tweaking & Ohms Law

Honeywell's Instructions for Setting the Heat Anticipator and an explanation of heat, resistance and recap of Ohm's law regarding heat anticipators

have moved to HEAT ANTICIPATOR ADJUSTMENT - T87

This article series on room thermostats and heat anticipators continues discussion of the basics of heating or cooling system thermostats, their use, setting, and adjustment. Here we provide A Guide to Finding, Using, and Adjusting Thermostats for Heating & Air Conditioning Furnaces & Boilers, Heat Pumps or Electric Furnaces or Boilers.

..

Continue reading at HEAT ANTICIPATOR ADJUSTMENT - T87 or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see HEAT ANTICIPATOR ADJUSTMENT FAQs - questions & answers about how and why to adjust the heat anticipator on some room thermostats, posted originally at this page

Or see this

Article Series Contents

• HEAT ANTICIPATOR OPERATION

Suggested citation for this web page

HEAT ANTICIPATOR ADJUSTMENT at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to HVAC THERMOSTATS

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Technical Reviewers & References

• Jaffe, James S, THERMOSTAT HEATERS [PDF], Fueloil & Oil Heat with Air Conditioning, February 1997
• [1] Proliphix Corporate Headquarters, 3 LAN Drive Suite #100, Westford, MA 01886 Phone: +1.978.692.3375 Toll Free (U.S.): 866-IP-LIVING (866.475.4846) Fax: +1.978.692.3378 - Sales: sales@proliphix.com Marketing: marketing@proliphix.com Customer support: support@proliphix.com http://www.proliphix.com/ - quoting from the company's website:
  All Proliphix Network Thermostats come with our free Uniphy Remote Management Service. This unique offering lets you monitor and control your HVAC systems by simply pointing your Browser to our secure Proliphix Web Site. Enjoy the convenience of programming a thermostat from any location, using a simple graphical interface. No computer equipment or software is required. And since Proliphix takes care of the network configuration for you, you’ll be up and running in no time. We’ll even proactively monitor your thermostats and send you an immediate email or SMS message when an HVAC problem is detected.
• [2] 'The Nest Learning Thermostat', Nest Thermostat, 900 Hansen Way Palo Alto, CA 94304, Tel: 855-4MY-NEST, Email: info@nest.com, website http://www.nest.com/, retrieved 1/24/2013.
• [3] Honeywell Controls, the company wants you to use their contact form at this web page: http://www51.honeywell.com/honeywell/contact-support/contact-us.html
  Honeywell Consumer Products, 39 Old Ridgebury Road Danbury, CT 06810-5110 - (203) 830-7800
  World Headquarters, Honeywell International Inc., 101 Columbia Road, Morristown, NJ 07962, Phone: (973) 455-2000, Fax: (973) 455-4807 1-800-328-5111
• [3a] Honeywell Tradeline T87T Universal Thermostat Installation Instructions for the Trained Service Technician', Honeywell International Inc. Honeywell Limited—Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveGolden Valley, MN 55422 Scarborough, Ontario M1V 4Z9, 60-0830—4 G.H. Rev. 8-02, retrieved 12/1/2013 Website: www.honeywell.com
• [3b] Honeywell CT87A,B,J Round® Themostat Low Voltage (15 to 30 VAC) Thermostat and Mounting Hardware Installation Instructions, Honeywell International Inc. Honeywell Limited—Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveGolden Valley, MN 55422 Scarborough, Ontario M1V 4Z9, 60-0830—4 G.H. Rev. 8-02, retrieved 12/1/2013 Website: www.honeywell.com
• [4] White Rodgers Thermostats and HVAC controls,
  Homeowner information: http://www.emersonclimate.com/en-US/brands/white_rodgers/Pages/wr-homeowner-info.aspx
  Contractor information: http://www.emersonclimate.com/en-US/brands/white_rodgers/wr_contractor_info/Pages/white-rodgers-contractor-info.aspx
  White Rodgers Product Catalog (don't misspell the company's name as White Rogers Thermostats) -
  http://www.emersonclimate.com/Documents/thermostats.pdf - Thermostat Catalog
• [5] Domestic Central Heating Wiring Systems and Controls, 2d Ed., Raymond Ward, Newnes, ISBN-10: 0750664363, ISBN-13: 978-0750664363, Quoting from Amazon.com:
  This unique A-Z guide to central heating wiring systems provides a comprehensive reference manual for hundreds of items of heating and control equipment, making it an indispensable handbook for electricians and installers across the country. The book provides comprehensive coverage of wiring and technical specifications, and now includes increased coverage of combination boilers, recently developed control features and SEDBUK (Seasonal Efficiency of Domestic Boilers in the UK) boilers ratings, where known.
  In addition to providing concise details of nearly 500 different boilers fuelled by electric, gas, oil and solid fuel, and over 400 programmers and time switches, this invaluable resource also features numerous easy-to-understand wiring diagrams with notes on all definitive systems. Brief component descriptions are provided, along with updated contact and website details for most major manufacturers.
• [6] 'Automatic Oil Burner Controls - Thermostats', Domestic and Commercial Oil Burners, 3rd Ed., Charles H. Burkhardt, McGraw Hill, 1969 (and later editions), ASIN B0000EG4Y8
• Hunter Fan 2500 Frisco Ave. Memphis, TN 38114 888-830-1326 www.hunterfan.com
• [7] Fuel Oil & Oil Heating Magazine, 3621 Hill Rd., Parsippany, NJ 07054, 973-331-9545
• [8] Domestic and Commercial Oil Burners, Charles H. Burkhardt, McGraw Hill Book Company, New York 3rd Ed 1969.
• [9] National Fuel Gas Code (Z223.1) $16.00 and National Fuel Gas Code Handbook (Z223.2) $47.00 American Gas Association (A.G.A.), 1515 Wilson Boulevard, Arlington, VA 22209 also available from National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. Fundamentals of Gas Appliance Venting and Ventilation, 1985, American Gas Association Laboratories, Engineering Services Department. American Gas Association, 1515 Wilson Boulevard, Arlington, VA 22209. Catalog #XHO585. Reprinted 1989.
• [10] The Steam Book, 1984, Training and Education Department, Fluid Handling Division, ITT [probably out of print, possibly available from several home inspection supply companies] Fuel Oil and Oil Heat Magazine, October 1990, offers an update,
• [11] Principles of Steam Heating, $13.25 includes postage. Fuel oil & Oil Heat Magazine, 389 Passaic Ave., Fairfield, NJ 07004.
• [12] The Lost Art of Steam Heating, Dan Holohan, 516-579-3046 FAX
• Principles of Steam Heating, Dan Holohan, technical editor of Fuel Oil and Oil Heat magazine, 389 Passaic Ave., Fairfield, NJ 07004 ($12.+1.25 postage/handling).
• [13] 'Residential Steam Heating Systems', Instructional Technologies Institute, Inc., 145 'D' Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987
• [14] 'Residential Hydronic (circulating hot water) Heating Systems', Instructional Technologies Institute, Inc., 145 'D' Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987
• [15] 'Warm Air Heating Systems'. Instructional Technologies Institute, Inc., 145 'D' Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987
• [16] Heating, Ventilating, and Air Conditioning Volume I, Heating Fundamentals,
• [17] Boilers, Boiler Conversions, James E. Brumbaugh, ISBN 0-672-23389-4 (v. 1) Volume II, Oil, Gas, and Coal Burners, Controls, Ducts, Piping, Valves, James E. Brumbaugh, ISBN 0-672-23390-7 (v. 2) Volume III, Radiant Heating, Water Heaters, Ventilation, Air Conditioning, Heat Pumps, Air Cleaners, James E. Brumbaugh, ISBN 0-672-23383-5 (v. 3) or ISBN 0-672-23380-0 (set) Special Sales Director, Macmillan Publishing Co., 866 Third Ave., New York, NY 10022. Macmillan Publishing Co., NY
• [18] Installation Guide for Residential Hydronic Heating Systems
• [19] Installation Guide #200, The Hydronics Institute, 35 Russo Place, Berkeley Heights, NJ 07922
• [20] The ABC's of Retention Head Oil Burners, National Association of Oil Heat Service Managers, TM 115, National Old Timers' Association of the Energy Industry, PO Box 168, Mineola, NY 11501. (Excellent tips on spotting problems on oil-fired heating equipment. Booklet.)
• [21] Trane TCONT800 Series Touch Screen Programmable Comfort Control Ownes Guide, American Standard, Inc., Troup Highway, Tyler TX 75711, January 2005, Telephone: Customer Service: 1-877-3381, website: www.trane.com

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