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Old 02-27-2011, 06:20 PM   #1
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ARD vs MARD dampers


what is the different between Automatic round dampers and modulated automatic round dampers? I know the MARD's have 3 wires, I assume this means they have to power open and power close? as opposed to ARD which has a spring open or spring close?

What would you use when zoning? Benefits to either of them?

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Old 02-27-2011, 07:42 PM   #2
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ARD vs MARD dampers


A modulating zoning panel, or a static pressure sensor to modulate it.

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Old 02-27-2011, 08:04 PM   #3
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ARD vs MARD dampers


If I were setting up a zoned system, I would be looking at basic open/close automated dampers, this being, a modulating damper would cause too many pressure variables in the system, resulting in a very complex control system to "modulate" to maintain downstream pressure.
The pressure sensors for such a system are expensive and require regular calibration to work properly.

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Old 02-28-2011, 01:22 AM   #4
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ARD vs MARD dampers


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Originally Posted by BlueBSH View Post
what is the different between Automatic round dampers and modulated automatic round dampers? I know the MARD's have 3 wires, I assume this means they have to power open and power close? as opposed to ARD which has a spring open or spring close?

What would you use when zoning? Benefits to either of them?
Why are you asking?
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Old 03-01-2011, 10:57 AM   #5
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ARD vs MARD dampers


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Why are you asking?
at the moment its just for my own education as I decide what to do in the future with my system
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Old 03-02-2011, 08:00 PM   #6
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ARD vs MARD dampers


One big difference , about 3x the cost...on the MARDs
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Old 03-02-2011, 08:36 PM   #7
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ARD vs MARD dampers


the cost is not that great of difference the 2 wire will open if the damper moter fails most of the time the 3 wire will depend on if the damper is in the open or closed postion carrier zoneing systems would be the most common to have the 3 wire in residential apps but in most cases it will be up to you both types of dampers will control air flow

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