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Posted on Oct 01, 2009
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Does the T8602C1095 have an anticipator that may need adjustment when the temperature set is exceeded, eg we set at 70 and it goes to 71-72 and then need to manually shut down system.

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  • Posted on Oct 04, 2009
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That is how they work. ther is a 1 to 3 degree variance up or down.it probaly does not kick back until 67 or68 degrees. a two stage furnace will keep a more steady temp.

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0helpful
1answer

My honeywell electric thermostat is on 70 degrees but my heater system for a moblile home blows cold air after it reaches 68 degrees why?

Thermostats have multiple issues when you start checking them against thermometers.

1) the built-in thermometer may not match the set temperature because one or both need calibration. Compare the built-in to an external thermometer and see if there is any adjustment to make them match. Record the setting on the thermostat and the temperature when it starts and stops -- there should be a 1-3 degree range which may be adjustable. The set point should be in the middle of the on-off temperature spread.
2) the thermostat has a heat anticipator setting which may be set poorly -- turning off the heat before it reaches the set point - the fan normally runs for 1-2 minutes after the heat source is off. The anticipator is used to stop heating before reaching the set point as there are still a lot of BTUs coming out during the fan run-down -- usually 1-2 minutes.
tip

How do I Set the Thermostat Anticipator

If you have an older thermostat that has a heat anticipator in it then there are some things that you need to know about setting it and what it actually does.

First the function of the heat anticipator is to fake the thermostat into feeling the room temperature as hotter than it really is. The heat anticipator is actually a variable output heater inside your thermostat. The amount of heat that it actually produces is very, very small. This heat does, however, make a difference in how the room temperature feels to your thermostat.

If no extra heat is made inside the thermostat it will not react quickly enough to shut off the heating source. This will make the room “overshoot” the set point of the thermostat.
By heating the thermostat up very slightly it then shuts down the furnace or heat source before it actually reaches the temperature set point. This will allow the left over heat to go into the room and raise the temperature to the set point by the time it is all used up.

If you are experiencing wild temperature swings or the room temperatures are either not getting to the set point or going over the set point then the heat anticipator either is not adjusted right or it is burnt out and not working at all.

There are a couple of different types of heat anticipators. They will usually look like one of these.

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If your heating is running too long then you will need to adjust the setting to a lower number. If you are not getting enough heat then go to a higher number. All you are changing when you do this is the amount of the heat coil you are using. Make small adjustments to the anticipator and then give it at least a half day before making more adjustments. Small changes can have a big effect if the heat anticipator is working correctly.

You also can set the anticipator by checking the current draw of the system. To do this you need to use an amp meter and measure the current draw of the heating unit when it is running. Then set the heat anticipator to the corresponding number of the current draw. This will at least get you a good starting point and some fine small adjustment can be made from there.

120c3f0.jpg

For more advanced digital thermostats there are cycle change features that do what this heat anticipator does in older thermostats. These often incorporate many things in determining the cycle length of the heating. These thermostats will not have a heat anticipator setting.

Like many things when it comes to your comfort, all people feel things a bit differently. You need to make the changes to the thermostat so that YOU feel comfortable. There is no right way it has to be done. Make it work for you and adjust the thermostat so that you are the most comfortable!

http://www.fixya.com/support/r3892721-programmable_honeywell

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

http://www.fixya.com/support/r3584298-air_conditioning_programmable_thermostat

http://www.fixya.com/support/r3898732-lux_thermostat_500
on Jan 30, 2010 • Heating & Cooling
1helpful
2answers

My forced air heater in the bathroom keeps going on and off when it reaches the set degree. Is the heater the problem or the thermostat.

Try setting the Thermostat to the highest temp and see if it keeps running. If temp goes to the max it is the Thermostat if it stops prior to the thermostat setting it is the heater!
0helpful
1answer

What should the heat anticipator be set at on the thermostat?

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.

If you are replacing an existing defective thermostat with a new one, simply, set the anticipator to the same setting as the old one- as long as they are of the same manufacturer and model.

If you don't have the old one to match the new thermostat settings to, then you need to measure the thermostat's circuit using an ammeter.

In order for the thermostat to operate properly- you must adjust the heat anticipator resistor to match the current of the gas valve or relay on an oil-fired burner..

Another option is to install the T-stat using the factory default setting.
Since you did not mention the make and model number of the T-stat you are using, I cannot be more specific.
1helpful
1answer

Bryant Furnace starts up then shuts off

If you have a standard thermostat and not a digital stat, the problem could very well be the 'heat anticipator' setting on the thermostat sub-base. It is a variable resistor that has to be adjusted to match the amp draw of the heating control circuit. In the heat mode, the heat anticipator 'warms' up the thermostat because of the heat generated through the system controls and causes the thermostat to 'anticipate' room temperature setpoint just a little before it really gets there.

If set too low, the result is a short cycle, if set too high, the result is an overshoot in setpoint temperature. The average setting for the anticipator is .4. You should see a very thin 'wire wound' flat resistor under the cover with a thin metallic pointer that physically slides from left to right or right to left. The pointer is pointing to its 'setpoint'. Adjust it up .1 or .2 from its current setting and observe operation for a week or so to see if any appreciable change has occurred.
0helpful
2answers

How do I adjust the heat anticipatory to its proper settings

Look on the gas valve. Or post the make and model
0helpful
1answer

My themorsat stop working,and I replaced the batteries.

see this causes and fix it. God bless you

Furnace Produces No Heat Possible Causes


Possible Repairs
  • Remove cover of thermostat and loosen screws holding unit to wall. Level the thermostat. Re-tighten screws and replace cover.
  • To adjust the heat anticipator, please see Heat Anticipator Adjustment.

  • Furnace Turns On and Off Frequently ("short cycling")Possible Causes
  • Dirty thermostat components
  • Heat anticipator not set correctly.


Possible Repairs
0helpful
1answer

The furnace cuts on and off frequentle so I am trying to adjust the anticipator, but i dont know where to move it

Try moving the anticipator to .2 or .3 There is a right way to do this but I need to keep it simple for you. Try.2 first. If it still short cycling move to .3. A 5 degree differencial is needed. That means if you set the thermostat at 70 then it will come on at 67.5 and off at 72.5. this keeps it from short cy.
0helpful
1answer

Brew temperature is too low

I think you ment kaffeestudio.de and their webshop redirects to
http://www.juraprofi.de/Service-Anleitungen:_:70.html
Eg http://www.juraprofi.de/anleitungen/E-Serie_Innen.pdf
5helpful
2answers

Honeywell RTH2310 thermostat temp variance

Hi,
Yes you can change that by change the number of cycles per hour that your t-stat looks from for youe furnace. Lower the cycles per hour number and it will increase the range.

You can see how to do it here

http://dl.owneriq.net/3/39359643-dfda-451d-bb81-828eecddd9fc.pdf

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101
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