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jlscottlp

08:38AM | 12/24/00
Member Since: 12/23/00
7 lifetime posts
Bvhvac
I have installed a new Honeywell CT87A,B,J thermostat. It's the small round one. The old thermostat did not have a heat anticipator setting on it. I used a volt/amp meter on the new thermostat and came up with an approx setting of .6. I have checked the furnace itself and cannot find a setting on it. The furnace works fine but it seems like the fan comes on too soon before the air is heated. I don't know what the heat anticipator really does. Would it control at what temperture the fan comes on. Thanks for any help.

HOLLYWOOD

05:27AM | 01/21/01
Member Since: 02/19/00
206 lifetime posts
Yhe anticipator actually heats up to turn the t-stat off just before it gets to the desired temp, Thus anticipates. The idea is that since the fan will continue to run for a while after the furnace gas valve shuts down, the anticipator will trip the stat and by the time the fan shuts down, it should be at desired temp. It has no control over the time in which the fan starts.

jack-of-all-trades

05:00PM | 02/06/01
Member Since: 02/05/01
7 lifetime posts
The heat anticipator on your t-stat will not
control your blower. Its only function is,
like its name, anticipates heat. The heat anticipator acts as a tiny heating element which causes the heli-coil in the thermostat
to react, prematurely causing it to reach the
preset heat setting on the dial. This is because the furnace produces heat from the heat exchangers long after the burners shut down. You can think of it as an energy saver, by not letting the living space get hotter than what you set the t-stat for.
As far as your blower goes, you may be able to adjust the temperature at which the blower comes on by adjusting the fan limit control
on the furnace.
J.C.
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