How to set the Heat Anticipator Setting

On Your Thermostat.

The device on your Thermostat called the "heat anticipator" is a small electric heater that uses the current of the gas valve or oil burner primary to cause the thermostat to dropout the heat before the room temperature overshoots. The reason for this is that furnaces are usually sized larger than they need to be.
    Usually it is set to the current draw on the gas valve. The way to find out what this current is is to look at the gas valve or oil burner primary. If you cant find the amp rating then you can take a clamp-on ammeter with ten turns of wire around it and measure the current. Keep in mind that the setting can be changed depending on the size of your furnace in relation to the size of your house.
    If it has been moved to a lower number that would cause the burner to short cycle a larger number will make it run longer. The way to know is to remove the cover on the thermostat and watch the mercury bulb to see if it is falling to the off position. If it is not check to see if the limit is opening. Scott 240-460-3820

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Written By:  Scott Meenen N3SJH of:
G&S MECHANICAL SERVICES.
Specializing in Mechanical, Controls and Electrical Modifications Of
Heating, Air-conditioning, Refrigeration, Cold storage,
Ice Production and Food preservation. Anything having to do with Heat and Energy.
Serving MD, DC, and Northern VA.
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                 This text written by: Scott Meenen * G & S Mechanical

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