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    Paul Nem's Avatar
    Paul Nem Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 9, 2008, 09:41 PM
    Furnace Cycling
    My original gas furnace (70s' technology) and my new medium efficiency furnace share a common problem. The same problem existed with a conventional mercury thermostat and a modern programmable thermostat.
    When bringing up the temperature the furnace will shut down and then immediately begin a new start up sequence. This happens about every five minutes until the set temperature is achieved.
    The furnace cycles like this even though outside temperatures may be within 10 degrees C of programmed settings.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 10, 2008, 12:22 AM
    The anticipation setting in the thermostat is wrong. Set it to longer.


    See page 3 figure 8 for a example of a anticipator.

    http://customer.honeywell.com/techli...0s/60-0830.pdf
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