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  1. #1
    Join Date
    Jan 2004
    Location
    Burleson, Texas
    Posts
    1,741

    Converting to SCR control

    Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......

  2. #2
    Join Date
    Jan 2008
    Location
    Near Philly
    Posts
    525
    Quote Originally Posted by andserco View Post
    Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......
    The only way you should attempt this is going back to the manufacturer of the heater. If the sell some kind of upgrade kit or are willing to sell you the parts, it should be OK. Anything other than that, and something burns up, your liable for messing with the heater in an unapproved manor.

  3. #3
    Join Date
    Jan 2004
    Location
    Burleson, Texas
    Posts
    1,741
    I agree with losing the ETL listing..just brainstorming on some stuff.. Thanks

  4. #4
    Join Date
    Jun 2005
    Location
    Manitoba, Canada
    Posts
    94
    Quote Originally Posted by andserco View Post
    Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......
    SCR control works very well on older VAV boxes. In one site I do repairs at have found only draw back is expensive to replace the SCR components when they fail.
    Last edited by bmc; 10-30-2009 at 09:34 PM. Reason: spelling

  5. #5
    Join Date
    Mar 2009
    Location
    Several Miles from Sane
    Posts
    1,472
    I agree with mechdorn, OEM or not at all.

    Try messing with your staging parameters instead. 1/2 the time may get you a better result on a VMA.
    If sense were so common everyone would have it !

    All opinions expressed are my own. Any advice provided is based on personal experience, generally accepted fact or publicly available information. As such, it is worth exactly what you paid for it, not a penny more not a penny less !!

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