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  1. #1
    Join Date
    Oct 2006

    Manifold board for Trinity boiler - 2 approaches

    I am in final designing stage for manifold board that will serve 17 loops divided in 7 zones in a ~3600sqf house, about 50K BTU heatloss.

    The heat source will be Trinity Ti100 (condensing boiler, 16-100K modulating), which requires a primary loop and no mixing valves within this loop.

    So far I have priced this project in 2 ways and first one would be about $1K more:

    Of course, primary loop is the same in both cases, with expansion tank, fill valve, ect.).

    1. 3 manifolds (5+4+8 port), 17 24V valve operators on each manifold port, 4 circulators (013 for the primary and 011 for each manifold), 3 zone switching relay for 3 manifolds.

    2. 7 manifolds (1 each per zone: 3+2+5+2+1+2+2), 7 thermostats, 8 circulators (1 for primary, 7 for zones), 7 mixing valves (?).

    Which system would be more efficient and where is my reasoning possibly failing? Any suggestions will be appreciated.

  2. #2
    Join Date
    Jul 2000
    Northern Wisconsin
    I go with circulators over zone valves everytime.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  3. #3
    Join Date
    Oct 2006
    Well, both approaches include circulators. The difference is that:

    1. There are only 3 manifolds with 3 circulators in front of them and 1 primary loop circulator:

    5 loop has 2 zones
    8 loop has 3 zones
    4 loop has 2 zones

    Valve actuators are wired accordingly to allow zoning.

    2. There are 7 manifolds, 1 per zone with 7 circulators in front of them and 1 primary loop circulator. Zone temperature regulated with mixing valves?

    I am leaning towards 1st approach, even though it's a bit more expensive. Not sure if #2 would work as good.

  4. #4
    Join Date
    Jan 2004
    Do all zones require a different water temp?

    If not, why aren't you using outdoor reset to control water temp.
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  5. #5
    Join Date
    Oct 2006
    Quote Originally Posted by beenthere View Post
    Do all zones require a different water temp?

    If not, why aren't you using outdoor reset to control water temp.
    Zones may require different water temperature just because they cover different areas:
    - Zone 1 and 2 are on slab: 1 is kitchen/dining area, 2 is bedrooms
    - Zone 3 has 24ft cathedral ceiling above
    - Zone 4 is master bedroom
    - Zone 5 is master bathroom, guest bathroom and wardrobe
    - Zone 6 is 3rd floor bedrooms
    - Zone 7 is 3rd floor loft

    So, I would like to be able to have different water temps in all zones, if possible.

    One big problem we have is that there is no existing thermostat wiring in these zones, so we are pretty much limited to wireless thermostats (or sensors) or adjusting supply water temp on return water temp readout.

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