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Danfoss TRV Help

Mark_125
Mark_125 Member Posts: 56
in Strictly Steam
Hi fellow Wallies,

I have one pipe steam, oversized of course. When it's really cold like it is now here in NYS our bedrooms all overheat. During the buffer months I use Gorton 5s to warm the rooms because they don't get warm enough and change to Hoffman 40s for the core of the winter. Despite this the bedrooms still over heat when its gets lower than 20F outside. The rest of the house is comfortable all the time.

To try and counter this (at least in my son's room, newborn, recommended 68-72F) I purchased a Danfoss TRV RA2000 (013G0140) with the RA-CLICK (013G8250) operator. I connected it up to the Gorton 5 and set it to number 3 (68F), but it does not appear to be working. I have put a thermometer next to the TRV and the room is a comfortable 70F, yet during the last heating cycle, the radiator came on full blast as usual. The room got up to 74F before I finally turned the TRV over to shut off the radiator.

Does anybody know what could be wrong here - could the thing be faulty? Have I got the right items? I've attached a photo and appreciate any help.

Thanks,

Mark

Comments

  • [Deleted User]
    [Deleted User] Posts: 0
    edited January 2014
    Right one?

    Just trying to learn what this TRV is.  But their data sheet says the RA2000 is for hydronic and 2-pipe steam systems:

    http://na.heating.danfoss.com/PCMPDF/RA%202000%20Datasheet_5_05_08.pdf

    Apparently they have an RA2000 1-PS designed for 1-pipe systems?

    http://www.danfoss.com/North_America/Products/Categories/Group/HE-HEC/Radiator-Thermostatic-Assembly-RA2000-Series/1-Pipe-Low-Pressure-Steam-Valve/39a5ec89-250b-409c-9bf6-74541f0a94b3.html

    Do you have the right one?
  • Mark_125
    Mark_125 Member Posts: 56
    edited January 2014
    Yes, RA2000 1PS

    Hi Gunny,I should have been a bit clearer, yes, I have the RA2000 1PS.Thanks
  • Paul48
    Paul48 Member Posts: 4,469
    Pressure

    What pressure is the boiler running?
  • Mark_125
    Mark_125 Member Posts: 56
    As low as I can go....

    Cut out is 1.5 psi, cut in is 0.5 psi - as low as my old pressuretrol will go. Along the same lines as that, could the Gorton 5 be too fast, not allowing the TRV to close?
  • Paul48
    Paul48 Member Posts: 4,469
    From Danfoss

    "If using an air vent not supplied by Danfoss, it

    must be a straight shank vent"
  • Mark_125
    Mark_125 Member Posts: 56
    User error....

    I didn't have the operator all the way on the valve body - took everything apart today and then re-fit it all. Seems to be working now.
  • ChrisJ
    ChrisJ Member Posts: 16,317
    edited January 2014
    Too fast

    Just in case you still have a problem I am using two of these TRVs in our house.  Two similar sized radiators but in two completely different locations and piping is different.



    On one radiator a Gorton 6 works fine.  On the other a Gorton 5 even causes horrible overheating.  The radiator with a problem ended up with a Gorton 4 on the TRV and a Gorton 6 on the pipe feeding it.  This allows the pipe to vent fast as it goes from the basement to the second floor, but allows the radiator to vent slowly giving the TRV time to react to it.



    There are pictures of this found by clicking on the link in my signature.  You will find the TRV pictures near the bottom.   As you found, there should be no brass showing when the operator is snapped on.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

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