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Thread: Boiler overshoots setpoint

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  1. #1
    DIY Junior Member Bleecker's Avatar
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    Default Boiler overshoots setpoint

    I have a Burnham Alpine 105 w/ Sage 2.1 that won't begin throttling back until 5F or more above the setpoint (and takes its time once it does start, so the supply temp rises even further). This happens for DHW and central heat demand, regardless of the setpoint. The control board has been replaced but it hasn't changed this behavior.

    For now we've been tweaking the diff above/below and max modulation rate to try to reduce cycling, but any ideas or suggestions as to what may be causing this?

  2. #2

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    I have an Alpine 150 and it does the same thing. I was always under the impression that it was within acceptable limits of the unit. I have the high setpoint on my DHW set to 170 so if it goes to 175 it isn't a big deal. I don't think for a heat demand the unit did anything about 145 last winter so no danger there of overshooting a few degrees.

    But I am interested to know if this is in fact a problem?

  3. #3
    Master Hot Water Mpls,MN BadgerBoilerMN's Avatar
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    It is not.

  4. #4
    DIY Junior Member georgemp's Avatar
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    I have a similar issue. We have an Alpine 150 with an mcba board and I have set the setpoint temp down to 170. When you go to the information screen the setpoint still reads 190 and the boiler complete ignores the new setting and goes to 190+ thus shutting the boiler down sometimes. Do we need a new computer?

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    My boiler normally runs around 130-degrees, but when the priority zone (the WH) calls for heat, it jumps it up to 180-190. If yours has priority logic that is similar (I don't know if it does), that could be a reason why it is going to that high temp. Now, why it thinks it may be a priority zone call, if that's it, would take some further investigation, but that may give you something to check.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    Master Hot Water Mpls,MN BadgerBoilerMN's Avatar
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    Read and understand the installation manual. You have to save any changes to factory defaults.

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