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Thread: Thermostat

  1. #1
    Retired tool & Die and Mechanic Giles's Avatar
    Join Date
    Aug 2007
    N.W. Alabama--Florence--

    Default Thermostat

    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. #2
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    The cycle rate...cycles per hour...is adjustable in the system set up. see page 8 of the install instructions, to make sure you have all the right settings. Some of the factory defaults may not be right for your system.

  3. #3
    Homeowner Thatguy's Avatar
    Join Date
    Aug 2008


    Quote Originally Posted by Giles View Post
    seems to me like the temp in the home should drop a degree or two before calling for heat.
    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?

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    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.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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