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Massachusetts CO interlock requirements...

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Mark Eatherton
Mark Eatherton Member Posts: 5,853
in THE MAIN WALL
Can any one give me the name of the CO interlock that is required on heating systems in Massachusetts? I have a situation where one would come in handy, temporarily.



Thanks in advance.



ME

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  • Brad White
    Brad White Member Posts: 2,398
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    Not certain of a specific

    interlock, except for dry contacts on the CO detector wired to shut down the boiler by an in-series relay.



    The only other requirement in MA specific to this, is that the CO detector serving the boiler has to be hard-wired on the same circuit as the boiler in new work, so that the detector cannot be shut down without the boiler also being off.



    There may be something else I missed, so will stay tuned.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
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    Thanks Brad...

    Here is something that I found that will work. This is a strange situation whereby the system is slated for replacement soon, but I discovered some serious CO issues with the existing physical plant, and need to protect the residents (MFD).



    http://selector.3m.com/selector/us/en/healthcare/occ_health_safety/gasdetect_p/TechSheets/CM-21AManual.pdf



    I will have to place slave relays to handle the amperage, but I think it will work great. Will also wire the alarm contacts to a remote dial out device just incase an "Issue" arises.



    ME

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  • ScottMP
    ScottMP Member Posts: 5,884
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    Co interlock

    Mark, MA does have a code for the interlocking of CO with a rangehood for commercial applications. I belive Honeywell makes one. Not sure its code for boilers.
  • Brad White
    Brad White Member Posts: 2,398
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    MA Code regarding cooking

    Hi Scott!

    I was not aware of a CO requirement specific to commercial cooking, but we do have a provision in the code to have a ventilation interlock. This is to confirm that the hood exhaust fan airflow is proven before the main or pilot gas valves can be opened.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • ScottMP
    ScottMP Member Posts: 5,884
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    same thing

    Thats what I was talking about Brad
  • Brad White
    Brad White Member Posts: 2,398
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    Oh.

    OK, I saw the CO reference but the interlock does not wait for CO to be present although it relates to it eventually. Good to be on the same page with you as always!
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • ScottMP
    ScottMP Member Posts: 5,884
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    CO detector

    Not making myself clear Brad sorry. A CO detector is an acceptable alternative method to a drafting proving switch in a commercial hood application.

    I thought ME could use that type fo control system to shut down gas to a boiler.



    Scott
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
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    This one Scott?

    Thanks for the input.



    http://www.gamewell-fci.com/casestudies/HA_parking%20structure_guide.pdf



    ME

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