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  1. #1
    Join Date
    Aug 2006
    Location
    Windsor area Ontario Canada
    Posts
    285

    Noma t-stat junk

    Has anyone ran into this problem? i have seen it a few times... people with 30 or 40 year old olsen or clare heckla low boys changing from a mechanical t-stat to a cheapo digital programmable especially the NOMA brand they sell at canadian tire or wal mart, anyways what happens is they put these stats in themselves and a few weeks later their furnace will not work, it works for a bit with these stats then all of a sudden no heat, i go in change the stat to a mechanical or a honeywell programmable and it works fine, can anyone tell me the reason for this?

  2. #2
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,874
    My first guess would be a cheapo t-stat.

  3. #3
    Join Date
    Dec 2007
    Location
    Afton, VA / Khorat, Thailand
    Posts
    2,469
    Yea, junk is junk, wherever you buy it.
    Tough times don't last...Tough people do.

    Midnight Sun Astrophotography

  4. #4
    Join Date
    Jul 2007
    Location
    Northeast Ohio
    Posts
    17
    Some digital thermostats don't use relays to control the system. They use other electronic components that must not be compatible with the older system's circuits.

  5. #5
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,189
    Triacs on the cheapies can't handle the current flow of the old beasts.
    Perhaps you should have read the instructions before calling.

  6. #6
    Join Date
    Jul 2007
    Location
    Northeast Ohio
    Posts
    17
    Quote Originally Posted by jrbenny View Post
    Triacs on the cheapies can't handle the current flow of the old beasts.
    Exactly.

  7. #7
    Join Date
    May 2006
    Location
    Rochester, NY
    Posts
    22
    In most applications an isolation relay can be installed to solve the problem...
    I really can't go much further due to site rules.

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