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Buderus GB142 Modulation???

Cory_2
Cory_2 Member Posts: 10
in THE MAIN WALL
I've been reading about the new Buderus GB boiler that comes with the indoor reset controls, with a future option for outdoor reset. How does the boiler modulate the water temperature based only on indoor feedback? The only conclusion I can come to is that it's a set point boiler temperature and it modulates the burner based on flow. Am I misinterpreting something here, or does it not modulate the water temp?

Comments

  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    NM
  • Cory_2
    Cory_2 Member Posts: 10
    Interesting control strategy

    So has anyone gotten one installed yet?
  • Cory_2
    Cory_2 Member Posts: 10
    Interesting control strategy

    So has anyone gotten one installed yet?
  • dconnors
    dconnors Member Posts: 215
    yes....

    Many have been installed. Although this is old technology in Europe, it is fairly new here. The boiler modulates the burner based on the difference between set temp.and actual temp. when using the RC10. The temp difference and rate of change are the two factors that determine the firing rate. The circ. included is sized for the proper flow rate to maintain the desired delta T across the boiler. Should the delta T across the boiler spread wider indicating low flow, the boiler will modulate downward.
  • bob_44
    bob_44 Member Posts: 112
    Isn't

    this the same control strategy advocated by IBR for the last 45 years? bob
  • Cory_2
    Cory_2 Member Posts: 10
    Response Time

    Because the boiler fires when it recognizes the temperature drop and the rate of temperature drop what is the response time? I can see with radiators, baseboard, and low mass radiant floor heat that it would be able to come up to heat fast enough were one would not notice a temperature fluctuation. With high mass radiant such as a concrete slab wouldn't the response time for the floor take to long to maintain that same room temperature? Or even over shoot the desired temperature?
  • Ray Landry
    Ray Landry Member Posts: 203


    I'm putting one in tomorow, can't wait!
  • Darin Cook_3
    Darin Cook_3 Member Posts: 389
    Not exactly new here either

    If you have ever used a Buderus ecomatik control, you know that you could have used their indoor sensor also. The vast majority of Europe at least what I have seen first hand and worked on is panel radiation running constant circulation with thermostatic heads. If you really think about it, indoor reset makes more sense than outdoor reset. After all you are only trying to satisfy indoor comfort requirements.








    Darin
  • S Ebels
    S Ebels Member Posts: 2,322
    Ray

    I don't know where you're from but I'd advise you to check with your local code authority to see if the GB can be installed legally. From what I understand, it is not {H} rated yet and therefore can't be sold in states requiring that approval to be used as a heating appliance. We can't use them here in the hydronic Dark Ages swamp called Michigan.

    A good share of the inspectors here wouldn't know a condensing boiler or primary secondary piping if it bit them in the a**.
    BUT!.........they sure know how to look for approvals and listings.

    We had one last week that stood there with a "deer in the headlights" look on his face whilst he tried to comprehend a Vitodens running three temps. He was OK but it was obvious that he really didn't understand what he was seeing.

    Make sure your T's are crossed and your I's dotted before you hang that thing in there and have to rip it out. We did that with the first couple Munchkins that we installed and ate the labor for the swap. Not fun!!
  • Ray Landry
    Ray Landry Member Posts: 203


    Thanks for the heads up. Word from the buderus camp is that they will be approved in mass march 1st, which ironically enough is tomorow. Most inspectors around here, (espescially the town i'm installing it in) look to make sure your reliefs are piped down and that you have a bfp and not much else.
  • dconnors
    dconnors Member Posts: 215
    comes with the boiler

    You get the RC10 as standard equipment. This will provide you with indoor reset. Location of the sensor is critical. It must be the coolest zone.
  • Cory_2
    Cory_2 Member Posts: 10
    Info after install

    Ray Landry curious what type of system you'll be connecting the boiler up to. Slab, Radiators, Baseboard, or combination? As I posted earlier I'm interested in how the indoor temperature reset control will operate without causing a drop in temperature when used with radiant in a slab. Seem there could be a possible lag time? Happy installing.
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
    Coolest Zone?

    NM
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    NM
  • dconnors
    dconnors Member Posts: 215
    modulation

    Its based on a temp difference and rate of decline on increase. It will post purge if it overshoots the set point until it comes back down.
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