1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)

Load-side Controls

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by ewdudley, Oct 21, 2010.

Thread Status:
Not open for further replies.
  1. ewdudley

    ewdudley Minister of Fire

    Joined:
    Nov 17, 2009
    Messages:
    1,788
    Loc:
    Cayuga County NY
    I've been asked to share some system documentation, so here goes.

    All I have so far is the load-side stuff to control the oil boiler, storage transfer pump, load circs, and whatnot.

    Some probably non-obvious abbreviations: Stfy=satisfy, AqStat=aquastat, CFH=call for heat.

    Bus at top is 24VAC.

    Returns to 24VAC common for relay coils K1-K4 are not shown.

    No detail for power relays K8-K12 is shown.

    I see now that AqStatBuf1Top is missing from the plumbing schematic.

    A lot of the complication is due to the house having been converted to hot water from steam years ago and the radiators are large and the piping is fat. So when a radiator zone activates it dumps a bunch of cold water into the return side. I put in a Wilo variable speed radiator load circ in and that helped a lot, but finally I added an aquastat on the oil boiler return with bang-bang control to keep the oil boiler up to temp, for as much as I'll ever use it again if this project ever gets done.

    Cheers --ewd

    Attached Files:

    Helpful Sponsor Ads!





Thread Status:
Not open for further replies.

Share This Page