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Boiler zone controller with variable speed pumps?

zoom
zoom Member Posts: 72
Have a new HW boiler plumbed in. No DHW. Two heating zone pumps.

The boiler (Vitocrossal 300, CU3A) has a variable speed (VDC) logic built in to control a single circulator pump.

Is there an integrated controller that combines the 2 thermostat/zone pump controller with the variable speed output signal from the boiler itself such that both zone pumps can be run at variable speed per the boiler logic?

Comments

  • tc60045
    tc60045 Member Posts: 31
    No secondary, just a primary loop?
  • zoom
    zoom Member Posts: 72
    Two loops, one for upstairs one for downstairs. I have not designated either as primary at this point.
  • HVACNUT
    HVACNUT Member Posts: 4,077
    @tc60045 was referring to Primary/Secondary piping.

    Can you post some pics of the boiler and connected piping?
  • Steve Minnich
    Steve Minnich Member Posts: 2,659
    P/S would typically be unnecessary with a CU3A. Flow through the boiler isn’t a problem. The water capacity of that boiler is more than most cast iron boilers.
    Steve Minnich
    Minnich Hydronic Consulting & Design, LLC
    [email protected]