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MZ Radiant control strategy needed.

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  • Unknown
    Unknown
    KISS switching and control wanted

    I’ve got a whole house running off of a one zone high mass radiant slab. This works very well. However, I’m adding another 1,000 sq/ft section to this dwelling. I’ve got an MZ condensing boiler and looking for a SIMPLE way to control these two zones.

    What if I were to place a set of closely spaced tees on the existing near boiler primary circuit and run another circulator off that for the new zone? How could I control the primary (house circuit) with the addition of another separate zone of heat? A Taco SR502 may be able to be used here but, I’m not quite sure how to interface it with the MZ? I may need to use a zone valve to control the (injection supply) into the secondary loop zone. All same temperature system. All high mass KISS strategy wanted.

    Thanks in advance:)


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  • Robert O'Connor_3
    Robert O'Connor_3 Member Posts: 272


    The way we pipe the MZ is exactly the way that you described. Run the supply and return from the boiler into two closely spaced tee's. Install two circulators after that. In your application use a relay box and tie the end switch to T2 & T3 in the MZ. Finally set the dial in the boiler for the highest of the two temps. Let her rip.
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