Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Buderus Logamatic

dconnors
dconnors Member Posts: 215
in THE MAIN WALL
i would have powered 3 and 5 respectively for each unit off of terminal 63.

Comments

  • Jeremy_8
    Jeremy_8 Member Posts: 8
    DHW control not working?

    I have a new Buderus G215/4 with an R2107 and a Williamson 36 gal indirect DHW tank. I am having a hard time with maintaining setpoint in the tank. Currently I have it set to 130° because I keep empting the tank. I've watched the controller while there was a load on the tank and saw the temp drop to 122° by the time the load ended. At that point the boiler still hadn't fired yet. The circulator was also off. Why would it take so long? I havn't found anything in the instruction or installation manual regarding the upper and lower limits. I have a friend with the same controller, different model boiler, that says his boiler fires whenever the tank drops below setpoint. Could this be a wiring problem? I currently have the DHW set for 24 hour continuous operation.

    Also, this system has been online for a few weeks now and the boiler run hour counter still says zero...
  • Big Ed
    Big Ed Member Posts: 1,117
    probe

    Check the probe or themister .Make sure it is properly inserted... I don't know if they have yet started to make wells for the Buderus controls, to be use on other indirects.
  • Paul_28
    Paul_28 Member Posts: 113
    Make sure

    that AC wireing to the L8148 controler is correct. High to L1 and low to L2 and wire between terminal 8 on the 2107 and C1 on the L8148 aquastat.











  • Joe@buderus_2
    Joe@buderus_2 Member Posts: 302


    It best to have the contractor contact us from the site and we can review the wiring and set up of the control.

    On the R2107 the differential on the DHW is 7 degrees. The "logic" of the control knows if the DHW call is a draw down from useage or stand by loss. On a draw down the control will fire the boiler to max temperature. On stand by loss the control will fire the boiler to 25 degrees above the DHW setting and run the circulator to transfer the heat.
  • Jeremy_8
    Jeremy_8 Member Posts: 8
    Buderus Logamatic

    Is it possible to change the DHW differential?
  • Bob Morrison_3
    Bob Morrison_3 Member Posts: 54
    Is this setpoint configurable?

    Joseph,

    Is this differential of seven degrees configurable by the installer (or operator)?

    Thanks

    Bob Morrison
  • Joe@buderus_2
    Joe@buderus_2 Member Posts: 302
    Differential

    The seven degree differential is part of the Logamatic programming at the factory and cannot be changed.

    A jumper wire, installed by the contractor, needs to be installed to energize the hours run meter. Because the R2107 can be used in line voltage and low voltage, the location of the jumper depends on the application. Please contact us if there are any questions.
  • Jeremy_8
    Jeremy_8 Member Posts: 8
    I don't have a

    L8148. The installer used an R845A which is wired between terminal 63 on the logamatic and terminal 1 on the R845A. There is also a jumper between terminal 1 and 3....
  • dconnors
    dconnors Member Posts: 215
    remove the jumper between 1 and 3

    line in to 1 and 2, wire 63 to terminal 3. circ on terminal 4. make sure the circulator load is not more than 5 amp.
  • Jeremy_8
    Jeremy_8 Member Posts: 8
    What about

    in a hydroair situation? I have two air handlers, each with a TACO HAFC201 controller. Could that be why he jumped it?
This discussion has been closed.

Categories