Discussion in 'HVAC Heating & Cooling' started by Giles, Dec 14, 2010.

  1. Giles

    Giles Retired tool & Die and Mechanic

    Aug 28, 2007
    N.W. Alabama--Florence--
    I have an old natural gas central unit. It is heat only and is old enough that is uses a mechanical fan control switch. I only use it, in place of my heatpump, when temps are in the 20s.
    It works beaautifully--maybe to good.
    I am using a new Honeywell Pro TH311OD and when the outdoor temp is in the twenties or teens, the house stays at a constant 69 degrees.
    The gas unit cuts on a runs only about 3-5 minutes and cuts off.
    I am not complaining but seems to me like the temp in the home should drop a degree or two before calling for heat.
    I have looked at the instructions and I don't see a "heat anticipator" adjustment as it is electronic and non-programmable.
    Should I just be happy and deal with the short cycling?
  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
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  4. Thatguy

    Thatguy Homeowner

    Aug 27, 2008
    A bounty hunter like in "Raising Arizona"
    It probably does without this change registering on the display.

    My furnace is only on 1/4th of the time in a typical winter. Is yours also oversized?
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Many of the newer electronic thermostats allow you to adjust how close to the setpoint you want the temperature held. the closer you want it, the more it will cycle. this isn not necessarily very good for efficiency (depends on the type of heat). Burners don't fare well in efficiency when they only run for a short time. Electrical systems are fine with it, and hydronic systems may or may not, depending on how they are set up.
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