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Duo Therm Thermostat anticipator adjustment

My thermostat controls the AC and the heating, on heat the system comes on and runs till the coach is to warm then it waits to long to come back on again. I have heard the anticipator comes from the factory set at 1 and can be changed to .4 which would cause it to come on more often but not run as long. My problem is I can't find the adjuster inside the front cover, Does anyone know where this is supposed to be located? I have a 2007 Grand Junction with a 15000 BTU rooftop AC and a 40000 BTU Hydroflame furnace. There is an analog thermostat mounted on an interior wall but the coach is either too warm or too cold and there is no happy medium. Is there a way to adjust the thermostat or is there a decent replacement? I had the thermostat apart and cannot see where there would be anything that adjusts the anticipator or what have you.

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  • jpfriedel May 28, 2009

    Will any brand and kind of dogital thermostat work, or is there a special one for RV's?

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Replace your thermostat with a cheap digital heat/cool thermostat - no more problem. (be sure to turn off the power to all parts of the HVAC system before changing the thermostat.)

Posted on May 28, 2009

  • HANK MCNEIL May 28, 2009

    any one should work fine

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Posted on Jan 02, 2017

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We have a Duo-therm by Dometic thermostat that does not shut the ac off. We have to manually shut thermostat off to shut ac off. Any suggestions what we can try or just replace thermostat?


Try plugging the hole in the wall where the wire comes through. Also be sure you are not trying to reach your humidity set point therefore overshooting your cooling setpoint. Referred to "droop" in settings

Jun 01, 2017 | Dometic Heating & Cooling

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.

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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

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check thermostat, replace capacitors amp compressor to be sure its running if not relay module issue.

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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.

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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

Sep 30, 2012 | Honeywell Programmable Thermostat Heater

1 Answer

I have a 5 year old heat pump (electric) Home is 5 years old and is very energy efficient with 6 inch outside walls. Do I have a problem as the air will run for 5 minutes and shut off for 5 minutes and...


One thing you might check is to make sure there is not cold air blowing across the thermostat from one of the vents. I've seen this many times make the thermostat short cycle.

Some less expensive thermostats may be programmed to short cycle. If you have instructions available for the thermostat, try to find information or the "heat anticipator". It may have an adjustable setting.

Jun 30, 2011 | Heating & Cooling

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