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Get V83 off cold start- multi temp loops

Hi all. Have a V83 Burnham with a triple aquastat, Nix 3 zone controller. Nix is currently wired cold start. I rewired nix to remove jumpers and try and get boiler to maintain primary loop temp. Aquastat wiring landed on ZR /ZC but the main circulator doesnt seem to come on now. Id like to keep the primary loop warm as the basement is only about 45F and it should help with that. Ill be adding an electric HW looped through the primary coil for additional storage and summer use. Any help on getting the main circulator going would be appreciated.


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Keeping a primary loop warm just by running the circ isn’t a good idea. At some point, rather quickly you’re going to start condensing inside the boiler.
    I’m not sure if you’re using the boiler for domestic water production, in which case you’re maintaining temperature in the boiler. Running the circ just for the loop would cause the boiler to short cycle frequently.
    Uninsulated pipes in the basement, along with your probably oversized boiler, would add some heat to the basement, as would adding some fin tube. Could even add the fin tube on the return of the most used zone.
    A small indirect on its own zone would be much more efficient than using the coil to produce hot water to be stored in an electric water heater. The coil will need maintenance, will eventually start to plug and/or fail.
    How many zones? Zone valves or circulators?

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  • Steamhead
    Steamhead Member Posts: 16,889
    Change the triple aquastat to a HydroStat and set it up for circulator-on delay. This will let the boiler warm up a bit before the circ comes on.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • NH1983
    NH1983 Member Posts: 2
    SteveUSA - 1st floor is one zone, baseboard on circulator on close spaced tees. Second floor is radiant on 2 loops with 5 zones between them. 4 way i series with outdoor reset for loop temp ,zone valves on headers in upstairs distribution closet. I just got a trane unit heater ill be plumbing in for basement heat as well. My thought was preheat/ use the DHW coil till its time to cap it. Thanks for the ideas.