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    Exchang00's Avatar
    Exchang00 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 9, 2008, 10:49 PM
    Cycle time adjustment - Heating
    Hello,

    I have a roughly 15 1/2 year old furnace. Bryant 394B Gas furnace. The furnace cycles 5 times an hour. The thermostat is a Honeywell CT87A 4447 and on the packaging it says it calls for heat when the thermostat temp drops below 1 degree of the desired temo setting and shuts off at the desired temp. Anotherwords I have it at 70 and it comes on at 69 and shuts off at 70. However, How can I change the cycle to run about 3 times an hour? I have logged the cycles for a full day and it turns on for 3 and half minutes then off for 10 minutes , etc... I do know some thermostats have the option to set the cycle from 1 to 12 per hr but this one does not have it. I have tried to adjust the anticipator from the recommended .4 to .5 and then .6. same thing. It did not change the cycle. I did allow the system to adjust to the changed anticipator setting for a full day.

    Any help would be fantastic. Thanks!

    CAD:confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 9, 2008, 10:56 PM
    For a gas furnace that cycle time sounds good. If you change the time of the system you will also have a much larger swing in temperature and usually that is not desirable. If the anticipator will not adjust it enough for you you are out of luck.

    See link

    http://customer.honeywell.com/techli...0s/69-0274.pdf
    Exchang00's Avatar
    Exchang00 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Nov 9, 2008, 11:09 PM

    Thanks. I will let it cycle 5 times an hour. At first it seemed too much for a gas furnace to work but the idea of temp swing makes sense if I had it set lower.
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