Quick Tip To Make Sure Your Belimo Actuator Seals Your Damper Closed

Here is a quick and easy tip for when you are mounting ANY damper actuator, not just Belimo Actuators… yet most installers never do it. If you follow this super easy step you will help assure a good tight seal on your automated dampers in the closed position.

I even made it easy to learn with a nice, clean online training video using one of my new Christmas Toys. Take a look…

By correctly doing this extra step you will be amazed what other issues you won’t see anymore on your installs. If you are taking the time to follow this procedure, I guarantee, you will be paying more attention to other tasks such as:

  • Mounting the actuator perpendicular to the damper shaft
  • Tightening BOTH U-bolt nuts
  • Double checking for full and proper rotation from open to close

In some other videos I will go in more detail on each one of the above issues because they are pretty common and are easy mistakes to make when you are doing a full install with multiple dampers back to back or if you only got one to do, but you have to keep paying attention to what your helper is trying to crack open with your Channel-Locks.


What secret tips do you use when working with dampers and actuators?

C’mon you can tell me… just whisper it in the comments below. Shhhh…


12 Responses to Quick Tip To Make Sure Your Belimo Actuator Seals Your Damper Closed

  1. Matt Nelson January 16, 2012 at 07:40

    Great video, I always love learning about how contractors install devices and you are spot on about your damper position explanation. From my standpoint the most important part about the positive shut-off on the damper is to prevent freezing conditions at the unit or sub-cooling a space. A little leak overnight can freeze a coil.

    • The Controls Freak January 18, 2012 at 19:05

      Thanks for the comment Matt. It is great to hear and understand both sides of the conversation between engineer and his intentions, as well as contractor and his interpretation. ;)

  2. ben January 28, 2012 at 23:04

    Excellent video Able really learning a lot on this website. Nice quality video.

  3. Paulo César dos Santos January 29, 2012 at 21:03

    Mr. Abel
    I sent a message to you. Now, I saw your video and was very proud to contact you.I would like to contact you, but need your permission. Your profissional friend, Paulo César of Brazil.

  4. Marosh February 3, 2012 at 09:43

    Very Useful video,Thanks, MR. Abel.
    Actually whole your website is full of good information.I appreciated it.

  5. pat August 28, 2012 at 09:14

    I have 24 blemos to reinstall.none were installed right.I found your video at the right time.thanks. Im a building engineer and deal with chillers.would like more chiller stuff please.

    • Abel B Ramirez II September 18, 2012 at 08:47

      Glad it helped you out Pat. As for chiller info… Could you send me an email about some specific questions or issues you have as a building engineer that you would like to know more about?

  6. Pat September 24, 2012 at 14:46

    Im installing Belimo NV24-MFT Direct coupled actuators on powers 3-way valves
    with UNV-005 VP591 linkage adapters.
    Do you close the valve all the way or open it all the way before installing the linkage.
    I would love to see one of your videos installing Belimos on Powers valves.

  7. Jams November 3, 2012 at 15:26

    Belimo is quite kind & provides all its spring return actuators locked at about 5% open. That way you can install the actuator fresh out of the box with the damper “hand” tignt, then release the spring so it clamps down on the damper closing it “actuator” tight.

  8. danny January 10, 2013 at 09:52

    Thanks for posting the video!
    btw what kind of belimo actuator is the one on the video?

    • Abel B Ramirez II January 13, 2013 at 17:17

      Not quite sure what specifics I can give you. The actuator in the video is a Belimo NMB24-3, Floating Point actuator.

  9. John H October 31, 2014 at 11:29


    What tools did you use to do this video (writing tablet board, slow it down, edit on a video editing software, etc). Great work!
    I would love to do something similar for my sons sports analysis (screen markup).
    The text seems clear and well written without the jagginess of a typical writing on the screen video.
    Great way to explain technical concepts.



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