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Multiple Circulator & Zone Valve Relays with Post-Purge?

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Steamhead
Steamhead Posts: 18,834
in Thermostats and Controls
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.

Co-Founder, All Steamed Up, Inc.

Baltimore, MD, USA

Comments

  • hot_rod
    hot_rod Posts: 28,212
    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
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • STEVEusaPA
    STEVEusaPA Posts: 6,505
    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).

    There was an error rendering this rich post.

  • Mad Dog_2
    Mad Dog_2 Posts: 8,726
    Wow that's cool stuff , steve. Mad Dog
    Consulting by Mad Dog & Matt Jr.
  • wogpa67
    wogpa67 Posts: 238
    Th e Honeywell AQ2000 series does, also the Exp Taco has available plug in cards to do that.
  • Robert O'Brien
    Robert O'Brien Posts: 3,604
    AQ2000 is the way to go,does that and a whole lot more. Why reinvent the wheel!
    Ron Jr._3Zman
  • Ron Jr._3
    Ron Jr._3 Posts: 605
    Does,the AQ have the capability of being used for circs or zone valves with the same control ?
    Robert O'Brien
  • MikeJ
    MikeJ Posts: 103
    installing in floor heat for all floors for a new house, used gypsum over pex for the main level and 2nd floor. I will have 5 pumps for the floors, one pump for air handler, one for indirect tank.
    counting on not using air handler much,
    any ideas for switching relays?
    they have a huge shower 5-6 heads, not sure if I want to stop making hot water and switch to floor, 80 gallon tank.
    Robert O'Brien
  • Joe Mattiello
    Joe Mattiello Posts: 752
    Taco offers several controls to facilitate wiring similar to yours, including the SR506-4 EXP with 120 volt output for up to 6 circulators. It has a post purge feature built into the control, which is unique to the priority zone 6, normally used for DHW. If you prefer, you can use zone 6 for another heat zone, and use the post purge feature for that zone. However, it will not work on all the zones, as you mentioned. Frankly, I don't think anyone makes a control that enables you to purge residual heat, and dump into all the zones. Usually, the purge is synonymous with DHW.

    For your reference, I attached the Taco zone control wiring guide which is a great resource when challenged with a wiring issue. Please advise if you have any questions or concerns.
    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions

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