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Can I install a regular thermostat on a Buderus GB142?

david_and_heather
david_and_heather Member Posts: 32
in Radiant Heating

Hi there,My new-to-me house has a Buderus GB142 to heat hydronic radiant floors in the kitchen. There is an RC10 room controller in the kitchen. About 50% of the time, the RC10 displays the actual room temperature. The other 50% of the time, it's off by several degrees. If this were a normal thermostat on a normal system, I'd know what to do.But it isn't, and the Buderus documentation is quite incomprehensible. And as for the RC10, the only manual I could find was in Turkish! (There was an English manual behind a paywall on Scribd). What I want to know is: can I easily set it up with a regular thermostat, such as a Honeywell T4? Everything related to this machine seems discontinued.

Attached are photos showing the wiring harness, the "external control" area on the BC10, and the unit itself. Do the 24 and 25 connections correspond to a regular 24v thermostat control? In that case, would I simply disconnect the wires going into "RC," move them over to 24/25, and then connect a thermostat on the other end?

This is supplemental heat; I don't really care about any advanced features.

Thank you,
David

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Comments

  • Ironman
    Ironman Member Posts: 7,623

    The “WA” terminals will turn the boiler on and off for space heating. There will be no reset, so the dail should be set the the maximum SWT that’s necessary for your heat emitters.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    david_and_heather
  • david_and_heather
    david_and_heather Member Posts: 32
    edited January 21

    Thank you!

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,772
    edited January 21

    You will just have to learn to read Turkish to get your answer.

    The T4 thermostat does not "Create" 24 volts. The T4 will operate on a 24 VAC circuit. so to answer your query… Connect the T4's R and W terminals to the WA terminals on the Buderus

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    Ironman
  • pecmsg
    pecmsg Member Posts: 5,571

    Can you use in floor without measuring the floor temperature?

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,772
    https://forum.heatinghelp.com/discussion/comment/1836717#Comment_1836717

    YES…. That is what is in my homes in NJ. Radiant Floor Heat with wall thermostats.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    pecmsg
  • pecmsg
    pecmsg Member Posts: 5,571
    https://forum.heatinghelp.com/discussion/comment/1836718#Comment_1836718

    The reason I asked was that control is set for 140. I would be worried about overshooting.

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,772
    https://forum.heatinghelp.com/discussion/comment/1836720#Comment_1836720

    If you are really worried about over-shooting, then you should aim lower. 🤣🤣🤣🤣🤣

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    pecmsgIronman
  • david_and_heather
    david_and_heather Member Posts: 32
    edited January 21

    Ironman, sorry, I have more questions! The two WA terminals are labeled "1" and "2". Obviously, there's nothing with this labeling for a thermostat. So here are my questions:

    1. Am I correct that this setup merely involves closing a circuit, so 1 and 2 are interchangeable (as long as the correct two connections are made at the thermostat)?

    2. At the thermostat end, would these be wired the same way as for a steam boiler? My steam boiler has one wire each going into W1 and R. (It has the original cloth insulation, so there is no color.) Is this right? I'm not so sure, because the Buderus manual says WA is for a "potential-free" thermostat, and I thought the R wire sends a 24V signal.

    3. Can I use any Honeywell thermostat that does not require a C-wire (such as the RTH8560D) with this?

    Thank you so much 🙏

  • david_and_heather
    david_and_heather Member Posts: 32

    Thanks, everyone!

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