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stmbtwle

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Reply with quote  #11 
A 24v unit will usually work on 12v, it just won't be as fast or as powerful.

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Bert

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Reply with quote  #12 
Hmm... I didn't think a 24v damper would work with DC since they usually run off a simple 24v transformer.... but maybe they will.
Will have to try one out and see. Would be nice to run it from 12v DC.



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Bert K.
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colinmcc

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Reply with quote  #13 
Bert, they won't, don't try it. Trust me you'll burn the motor out... The standard for them is  indeed 24V AC since that is a simple transformer step down from 120V AC. (Transformers don't work on DC.) It is also why they are spring return units since a small  AC motor won't 'reverse' unless it has field and armature windings.  You might be able to find a 12VC DC motor though and fit it in place if a 24VAC motor.

As an alternative you could use your 12V DC to power a small relay with a 12V DC coil that in turn switches  24V AC to the bog standard damper motor.
Bert

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Reply with quote  #14 
Good to know.

If this gets too complicated, then I will just use a 24v transformer. I have until spring to fool around with ideas and  decide though.  You would think that they would have 12v dampers out there. Maybe for a boat or mobile home.

I am planning on having the dampers hook up to a thermostat. When the room gets too warm, I want to route the output to another room.


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Bert K.
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colinmcc

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Reply with quote  #15 
Here's a small 12v DC reversible motor with gear box driving an 1/4" output shaft at 5RPM. This would do it if you can make it fit. [idea]

http://www.amazon.com/Worm-Gear-Motor-Miniature-Metal/dp/B00NLZ46GU/ref=sr_1_21?ie=UTF8&qid=1447283261&sr=8-21&keywords=12v+dc+motorhttp://
stmbtwle

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Reply with quote  #16 
Oops sorry I thought you were talking about a solenoid.  They will work on DC.  Agree a transformer or an induction motor WON'T.



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Bert

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Reply with quote  #17 
That could work!  What happens when the damper is opened or closed all the way? Does the motor stop or keep trying to move?
It's not clear in the description. 
May have to use a controller that would stop it after a few seconds?

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Bert K.
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colinmcc

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Reply with quote  #18 
Bert, You'd have to get a couple of micro switches (also known as 'limit' switches) and wire these in so that the damper (Or more likely an arm fitted to the motor/damper shaft) hit one or other when fully open or closed which would break the circuit and stop the motor. Should be simple enough to do..
stmbtwle

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Reply with quote  #19 
Some months ago I purchased an auto heater coil at a wrecking yard.  For $50 they gave me the whole assembly from an Explorer... Heater coil, AC evaporator, 12vDC centrifugal fan, TWO dampers with 12v actuators.  The actuators were very interesting but were solid-state controlled, I burned one out before I figured it out and threw the other one away. Still, if one could figure out how they worked they might be just the ticket.

Here are more motors etc, might find what you want:
http://www.allelectronics.com/make-a-store/category/400/motors/1.html

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Willie, Tampa Bay
Garage_Hermit

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Reply with quote  #20 
Bert, from the technical data:

"No-load speed: 5 rpm"
"Rated torque: 12kg.cm"

So without a load, the shaft does a full revolution in 12 seconds.
Torque of 12 kgs per cm = 10.4 inch pounds
(I hope...)
http://www.convertunits.com/from/inch-pound/to/kilogram-force+meter

G_H



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