Return or flow? Advice much appreciated

Discussion in 'Plumbers' Talk' started by geeman75, Apr 16, 2017.

  1. geeman75

    geeman75 New Member

    hi, looking for a bit of advice. Had a complete new system put in. Worcester greenstar with unvented cylinder. Been in use for 6 months over the winter. Never been short of DHW while the CH has been on morning/day/night. Have noticed that with the CH now hardly on that there is very little DHW.

    Long story short is, when I press to boost DHW it doesn't fire up the boiler. Fitter left all the programmer bumf and I'm satisfied the wiring is in place.

    I do suspect that the plumbing might be wrong tho. As it is right now the coil connector with the zone valve actuator on it is connected to the CH flow on the boiler. Am I right in thinking it should be connected to the return on the boiler.

    Can anyone advise on the water flow through the cylinder in terms of CH. does the water go through the cylinder coil before the zone valve actuator or is the ZVA on the outward flow from the cylinder?

    Big thanks to anyone who
    A. Understands my ramblings and

    B. Posts a reply.
  2. Glad its Friday

    Glad its Friday Active Member

    Connection to the flow side of the boiler is correct.
    From the boiler, the flow should tee off to your zone valves, one for the heating and one for the hot water cylinder.
    So when you press the hot water boost on the controller, then your hot water zone valve opens, switches on the boiler and away you go.

    Best post some pictures to see how it has been plumbed up - would be a surprise to find your original plumber put the zone valves in series (only get hot water when the central heating is on), but hey ho, seen it before.

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