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  1. #1
    Join Date
    Nov 2001
    Location
    east kansas
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    8,024

    120 vac fire damper, spring return/shut

    Should 120 vac fire damper acuators have disconnects so a guy can service them?
    Beware of advice given by some guy on the Internet.

  2. #2
    Join Date
    Oct 2001
    Posts
    6,942
    no .......what if you check a floor and forget to repower it .just disconnet the power wire at the 1900 box or within the damper actuator.
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  3. #3
    Join Date
    Mar 2007
    Posts
    3,103
    No. The most you can hope for is a rib relay, a manual reset high limit, and an on/off switch.

    There's not really much to do to those things. If you have 120v present at the motor, and it's not opening, get a new actuator.

  4. #4
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,024
    Quote Originally Posted by BergerMech Rob View Post
    No. The most you can hope for is a rib relay, a manual reset high limit, and an on/off switch.

    There's not really much to do to those things. If you have 120v present at the motor, and it's not opening, get a new actuator.
    Got that. Except for the on/off switch.

    Every once in a while after a power outage a couple of dampers wont open. I was calling the on/off switch a disconnect. None of them have it. I was thinking about installing an on/off switch when I exercise the actuator. Usually just pulling the hot works.
    Beware of advice given by some guy on the Internet.

  5. #5
    Join Date
    Feb 2004
    Location
    SW Florida
    Posts
    1,260
    That type of damper is called a combination fire/smoke damper (fsd) as opposed to a curtain-type fire damper (fd). They "fail" to the default position of closed when not energized. If there is not a dedicated fire control panel, they should be wired directly into the air-handler fan circuit,controlled with a firestat or a duct smoke detector. You then kill the FSD power by disconnecting the AHU circuit for servicing.

  6. #6
    Join Date
    Dec 2005
    Posts
    107
    Various control panels and test switches are available as options on the dampers. They should be specified more but rarely are.

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