Page 1 of 2 12 LastLast
Results 1 to 13 of 15
  1. #1
    Join Date
    Jan 2009
    Location
    Central Iowa
    Posts
    213

    What Control strategy uses.....

    What control strategy uses 24vac and has three wires; one common, 0-24vac on one line to drive cw and 24-0 vac to drive ccw? This is in a Lennox VVHC system and I'm trying to replace the damper actuators. It seems like Belimo LMB24-3 ought to work, but it doesn't because it's not really floating point control. sometimes there's 24 vac on one input line, sometimes it's on the other and sometimes there's 12 vac on each.
    Thanks for the help.

  2. #2
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
    Posts
    3,879
    Pulled the manual on this because I'm not familiar with the system(haven't seen a VVHC). The Lennox says the actuators are ML6161 which are Honeywell and the same as the LMB24-3 or LMB24-3T
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  3. #3
    Join Date
    Oct 2009
    Posts
    628
    It sounds like its an incremental actuator (output x drives actuator one way, output y drives actuator the other way). Any actuator should work as long as it accepts the same signal.

  4. #4
    Join Date
    Jan 2009
    Location
    Central Iowa
    Posts
    213
    You'd think so, but it doesnt work. The thermostat splits its 24vac between the two inputs. Almost never does it have the entire 24vac on one line, then the other, THAT would be too easy. The LMB24-3 needs the entire 24 on the y input or the w input.

  5. #5
    Join Date
    Mar 2008
    Location
    NC
    Posts
    1,460
    This is the actuator that Joey was referencing.
    http://www.industrialcontrolsonline....=1305&survey=y

  6. #6
    Join Date
    Jul 2001
    Location
    Canada
    Posts
    1,810
    If you do have the HW ML 6161 its a TRISTATE a nd can be replaced with the KMC MEP-5073 ( obsolete but still around ) or the KMC MEP-4001 also SIEMENS GDE131

  7. #7
    Join Date
    Jan 2009
    Location
    Central Iowa
    Posts
    213
    Thanks for the help guys. I think I'm headed in the right direction now.

  8. #8
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
    Posts
    3,879
    According to this, an LMB24-3 should work, unless I misread

    http://www.zonexsystems.com/PDF/ARCH...C%20Manual.pdf
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  9. #9
    Join Date
    Jan 2011
    Location
    Bartlesville, Ok
    Posts
    113
    Are you sure the signal is not a 0-135 ohm Honeywell wiper signal? Belimo offers that as an option. The sweep is the 0 - 135 ohm resistance from end to end. The wiper (like a windshield wiper) floats in between the two ends, giving (for example) a signal of 100 ohms from the wiper to one end of the sweep and 35 ohms from the wiper to the other end of the sweep.The "wiper" in between the 0 and 135 ohm "ends" will create a different proportional piece of the signal out of each end of the "sweep".

  10. #10
    Join Date
    Jan 2009
    Location
    Central Iowa
    Posts
    213
    Here's the original actuator. Still having a time trying to match it. I bought a couple of ML6161B's on e-bay to try.Name:  IMG_0298[1].jpg
Views: 255
Size:  42.4 KB

  11. #11
    Join Date
    Jul 2001
    Location
    Canada
    Posts
    1,810
    Take a look on the 2nd page of this PDF , it looks what you have http://www.zonexsystems.com/PDF/INST...AHDM_instr.pdf

  12. #12
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
    Posts
    3,879
    Quote Originally Posted by Control Man View Post
    Take a look on the 2nd page of this PDF , it looks what you have http://www.zonexsystems.com/PDF/INST...AHDM_instr.pdf
    Nice
    find
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  13. #13
    Join Date
    Apr 2005
    Location
    Boulder,CO.
    Posts
    552
    If your just having problems controlling the actuator make sure your 24vac is tied to the common terminal I've seen this throw plenty of people. If it's finding one that fits the application I would follow the previous suggestions.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event