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Forums > Boiler Discussions - All Locations/Regions > General Discussions
Subject: Thermostat
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DanielUser is Offline
Novice Member
Novice Member
Posts:4
02/16/2012 12:32 AM  

What does longer on the anticipator setting on a mercury switch thermostat mean?

Dan
RBobUser is Offline
Intermediate Member
Intermediate Member
Posts:31
02/16/2012 1:30 PM  
Hi Daniel:

Increasing the setting will cause the cycle time of the boiler/furnace to increase--or the cycles per hour to decrease.
Does that help?

BobH
ReedUser is Offline
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Posts:462
02/16/2012 1:40 PM  

Imagine you have a house that heats up faster in a room other than the one the thermostat is in.  If you had no anticipator the furnace would stay on until the thermostat was warm enough (inside the thermostat) to shut the furnace off.  This could mean the rest of the house may be warmer than you intended  If you set the anticipator to a setting greater than 0, then the thermostat will shut off a little before reaching the setpoint.  This allows the heat from the other room to make it to the thermostat.

The anticipator works by allowing more current to flow through a resistor.  Adjusting the setting varies the amount of resistance.  The heat generated by this warms the coil that is normally used to shut the furnace off when it gets warm enough (and turn it on when it gets cold enough).  By adding more heat than is actually in the ambient air, it shuts the furnace off early. 

If set properly, an anticipator keeps the living space more comfortable and saves energy.

The image below shows the anticipator in the center.  The further the dial is set (clockwise) from the yellow wire, the greater the setting.





Reed Sprung
Sprung Services, Inc.
ReedUser is Offline
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Posts:462
02/16/2012 1:43 PM  
Oops, Bob had that one I guess. Both of our answers are correct. I just went over the river and through the woods to get there.
Reed Sprung
Sprung Services, Inc.
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