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    Multiple Circulator & Zone Valve Relays with Post-Purge? (3 Posts)

  • Steamhead Steamhead @ 5:06 PM
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    Multiple Circulator & Zone Valve Relays with Post-Purge?

    Looked at a HW job yesterday with six circs and four zone valves. The control system for this looks like someone threw a whole bunch of spaghetti onto the wall and it stuck. Since we'll probably be re-wiring this, does anyone know of a mutiple circulator or zone valve relay that will allow the circs to purge some of the heat out into the zones after shutting off the burner?

    TIA.
    "Reducing our country's energy consumption, one system at a time"

    Steam, Vapor & Hot-Water Heating Specialists

    Oil & Gas Burner Service

    Baltimore, MD (USA) and consulting anywhere.
  • hot rod hot rod @ 10:52 PM
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    does it have an indirect?

    if not the priority relay output on most pump relays has a post purge. I know the Caleffi ZSR has a non-adjustable 2 minute post purge on relay 1
  • STEVEusaPA STEVEusaPA @ 1:32 PM
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    Make your own

    Unless someone has some commercial controls experience, you may be better off getting your own relays/contactors (Grainger's) and making it yourself.  I know a real wizard up here in the Philly Suburbs who used to build/service elevators before he started his HVAC career. I've seen him do some interesting things with relays and contactors.  Send me a message if you want his info.
    Tekmar boiler controls (I know the 374 does) also post purge on the DHW contacts ( think until 10 or 20 degree drop).
    steve
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