Radiant system running even when indoor temp reached?

Jotel me this Posted By Jotel me this, Oct 15, 2018 at 11:31 AM

  1. Jotel me this

    Jotel me this
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    Along with my wood stove, my house also has radiant heating in the floors (water) running off of a Navien-110 boiler. First test run for the winter season, the house temp started at 66 degrees today. After two hours it finally reached the set temperature of 68 but its still running and the digital display shows the little flame which means its still using propane.

    Any ideas why?
     
  2. begreen

    begreen
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    Usually the thermostat has a swing setting to avoid short cycling. It may need to get .5-1º warmer before shutting off.
     
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  3. OT_Ducati

    OT_Ducati
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    Does the t-stat have a floor sensor?
     
  4. fbelec

    fbelec
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    not for a boiler. if it were electric yes. the boiler depending on the set up will only give the loop of heat 120 degree water. the thing with radiant is leave it at a set point and don't try using a set back thermostat or you will be left feeling cold and the heat bill with cost more
     
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  5. Jotel me this

    Jotel me this
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    nope. :eek:
     
  6. Jotel me this

    Jotel me this
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    what is a set back thermostat :eek:
    the thermostat i have comes on a few times per hour even at temp for some reason
     
  7. begreen

    begreen
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    Has the thermostat swing range been checked? Is the boiler just for heating the floor or does it also heat domestic hot water?
     
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  8. Highbeam

    Highbeam
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    So the thermostat itself calls for heat even though it keeps displaying the set temp?
     
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  9. fbelec

    fbelec
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    what thermostat do you have? if it is the honeywell that senses wall and air temp that might be why it is coming on at random times. if it is the round type made by honeywell that is new (no mercury ball inside) junk it and get a different type those thermostats have a mind of their own and it's not a good one. if it is the old round honeywell that has the mercury ball those are the best. lasts for about 50 years. also if it's old check to see if it has a heat anticipater if so set it for 4
     
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  10. begreen

    begreen
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    Could also be rounding of the display is not the same as internal temp reading so that 68.7 reads as 69, but the thermostat say, no that is not really 69 and turns on the heat until it is actually truly 69 or above. Just speculating here.
     
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  11. Jotel me this

    Jotel me this
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    Thanks for all the responses. Great community

    44.JPG

    So, if the temp is set to 65, the heat will come on and run until 65. i think i didnt give it enough time to turn off as someone stated above, it might turn off .5 degrees higher to avoid short cycling.

    once it turns off, even if the house is still 65, it comes on 2 to 3 times per hour. its one of the thermostats where you can press two buttons at once to get into the 'advanced settings'. one of the settings lets you choose the number of times it does this.. but there is no 'zero' setting.

    took forever to find the instructions: (page 8-9)
    https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1849.pdf

    My settings (if it makes sense):

    (first number corresponds to the options on Page 8 / Second number is your actual setting for that option)

    1 0
    5 5 <-------------- ? should i have this at '1' :eek:
    9 3
    13 0
    14 0
    15 5
    70 Test

    The setting in question is Number 5: Heating cycle rate (CPH: cycles/hour):

    These are the options...

    5 For gas or oil furnaces of less than 90% efficiency
    1 For steam or gravity systems
    3 For hot water systems & furnaces of over 90% efficiency
    9 For electric furnaces [Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]

    ..I have mine set to #5. But it allows me to choose Other cycle rate options. i can choose 1,2,3,4,5,6,7,8,9,10,11,or 12

    should i just put it at 1 so that it cycles only one time per hour?? (if thats what this setting even means)

    Sorry for the confusing post. looking at it in person its straightforward, but im sure its confusing for those looking at a jumbled mess of words and numbers :eek:
     
  12. begreen

    begreen
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    I would try it at 3 for a bit and see how that works out.
     
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  13. fbelec

    fbelec
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    sounds like it is trying to keep the boiler or furnace warm so when it calls for heat it can go right to work. my opinion is how ever many cycles it turns on for without it calling for heat it's wasting fuel. i'd set it for 1 so it's not coming on while you have the wood stove running
     
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  14. Hogwildz

    Hogwildz
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    If your hot water is also connected to the boiler, than it is going to continue to run as supply is needed.
     
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  15. fbelec

    fbelec
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    to add to hogwildz it will run on demand but also it will keep the water in the boiler at a set temp. and to add to that i've gone into homes where the hot water was moved out from the boiler tankless coil and to a tank and who ever did the move never took out the triple aquastat but turned it down to minimum temp which is around 100 so the boiler would hold that temp.
     
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  16. CaptSpiff

    CaptSpiff
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    I'm just doing a quick "drive by here" but isn't this the Maximum number of cycles per hour?
     
  17. fbelec

    fbelec
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    best thing to do is call their tech support line they are usually good they should explain it.
     
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  18. Jotel me this

    Jotel me this
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    yep. thats my question. should i lower the CPH? running on propane, its a killer to watch it run 3 times an hour when its already at temperature.
     
  19. begreen

    begreen
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    How is your domestic hot water for showers heated? Same system or a completely different system?
     
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