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  1. 03-11-2008, 09:34 AM #1
    Cub
    Cub is offline Regular Guest
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    What's a dumper damper for?

    Pros,

    My parents have a ranch, 2 zones. Furnace is gas; single stage (I'm pretty sure).

    Not too far from the furnace, there is a large duct that connects directly from the supply to the return, with a counterweighted damper. The HVAC tech called it a "dumper damper". Great name.

    Is this a standard thing? Is it to equalize pressure if one zone is being heated/cooled?
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  2. 03-11-2008, 10:05 AM #2
    dash
    dash is offline Banned
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    That's the Bypass Damper,no big deal on the name,it allows excess air to bypass from the supply to the return,when less then all zones are calling .

    It should be closed when all zones are calling.
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  3. 03-11-2008, 10:32 AM #3
    Cub
    Cub is offline Regular Guest
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    Thanks dash.
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  4. 03-11-2008, 11:28 AM #4
    2cold_in_nh
    2cold_in_nh is offline Waiting Email Confirmation
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    http://www.thisoldhouse.com/toh/vide...047185,00.html .
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