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Wiring diagram needed for a 3 pump central heating system

Discussion in 'Plumbing and Central Heating' started by Mal67, 13 Dec 2012.

  1. Mal67

    Mal67

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    Hi
    I have been given the task of sorting out someone elses bodge job.

    Big house with an oil boiler

    2 CH zones and one HW
    3 Zone valves (Drayton ZA6)
    1 pump (that is not up to the job)
    Horstmann programmer

    The idea is to have one pump per zone which is what was originaly specified but I can't figure out the circuit. If i use the switch in the zone valves to trigger the pumps individually I can't trigger the boiler.

    Help

    thanks
     
  2. doitall

    doitall

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    Why not.

    The zone valve orange can fire the boiler and start the pump, if you use the right relays

     
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  3. Mal67

    Mal67

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    Relays of course!

    Thanks for the quick reply, much appreciated.

    Any recomendations on relays, I can only find the Drayton RB-1 which is very expensive and out of stock!

     
  4. BGEngineer

    BGEngineer

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    Why don't you just use whatever is triggering the zone valve ie programmer/stats to also trigger/power the individual pumps. Then just let the zone valves trigger the boiler?
     
  5. matt1e

    matt1e

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    rs probs your best bet
     
  6. matt1e

    matt1e

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    Because ideally you need the valve open before the pump starts
     
  7. BGEngineer

    BGEngineer

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    Yeah ideally, but I don't think it will cause any harm in this situation. Besides the valve will have started to open when the pump starts.
     
  8. DP

    DP

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    What do you think will happen if the valve motor goes belly up and valve does not open? :eek:
     
  9. BGEngineer

    BGEngineer

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  10. matt1e

    matt1e

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    No the worst could happen is you could also destroy the pump!!
    But saying that, there's not wrong with your link BG
     
  11. ir50

    ir50

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  12. gaswizzard

    gaswizzard

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    Nothing wrong with triggering the circulators via the motor open of MV (brown) , been doing this for years with no issues. :rolleyes:

    I'm sure if one of the MV's went belly up the custard would get it sorted before any damage to circulator. :D
     
  13. rpevans

    rpevans

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    Why not just replace the existing pump with a correctly sized one? Much simpler.
    Rich
     
  14. DIYnot Local

    DIYnot Local

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