Heating wiring advice

Pauly · Mar 2, 2019

I have wired a heating system with 8 heating control zone valves and 1 on water,all work ok,problem is it has heating pump which comes on with heating valves but also with hot water zone valve,how can I separate the heating pump to only come on with the 8 valves.

bill01803 · Mar 2, 2019

relays

davesparks · Mar 2, 2019

You need to install a relay to seperate the heating pump, just make sure there can't be a situation where the boiler fires without a pump running

Pauly · Mar 2, 2019

I understand that mate but where do I feed the relay from bearing in mind there's 8 valves and I don't want to connect all together so if 1 valve opens it brings on all the others

Midwest · Mar 2, 2019

What 'valves' are they?

Kamikaze · Mar 2, 2019

I always thought you needed the hot water on for the heating to work. But to get hot water only one had to separate it from the heating?

Corbs · Mar 2, 2019

If there two ports valves you won’t need to add a relay as each port valve has a micro switch

So you have two pumps correct ? Else how is the hot water fed

Kamikaze · Mar 2, 2019

Kamikaze said:
I always thought you needed the hot water on for the heating to work. But to get hot water only one had to separate it from the heating?

It’s alright, I’ve answered my own question.

Here is a wiring diagram for an S plan.

[ElectriciansForums.net] Heating wiring advice

Pauly · Mar 2, 2019

Yes there are 2 pumps hot water pump comes on with switch live from cylinder stat and I've put heating pump on with the orange wire fed from the 8 zones but it also comes on with the hot water valve

Midwest · Mar 2, 2019

You wiring needs to be installed & connected in relation to the plumbing installation. What has the plumber told you to install?

It sounds like an S Plan would be suitable, but without know what the plumber has put it, we would be guessing.

Corbs · Mar 2, 2019

Pauly said:
Yes there are 2 pumps hot water pump comes on with switch live from cylinder stat and I've put heating pump on with the orange wire fed from the 8 zones but it also comes on with the hot water valve

Both pumps connected to the boiler (switch live/ call) yif so boilers back feeding when the heating is on which is powering the hot water pump

Power the hot water pump from the port valve brown (call) and the cylinder stat needs to have the switch live from the port valve

Or install a relay/ contractor on the heating oranges and one on the call from the cylinder then wire every back from them like a standard s plan plus

TBH don’t know why the heating engy hasn’t just used pumps instead of port valves

Wilko · Mar 2, 2019

My head is spinning like that pump - I need a pic or a diagram to make sense o this'n.

Devonchris · Mar 2, 2019

It's just an S Plan + (Google it)

In your case it's S Plan ++++++++

AJshep · Mar 2, 2019

Pauly said:
Yes there are 2 pumps hot water pump comes on with switch live from cylinder stat and I've put heating pump on with the orange wire fed from the 8 zones but it also comes on with the hot water valve

Yes as the orange wire is the output from the zone valve, and most likely connected to the switched live of the boiler then everytime the boiler fires up the heating pump will run.

Just put a relay in, this will probably work....
*Switch live of boiler in common.
*Oranges and of heating valve and heating pump in NC
* Orange of HW valve in NO
*Link NO of contactor to A1
* Neutral in A2

Sparkie30 · Mar 2, 2019

Dont think you need a relay, just pair the pump doing the heating with the brown of the 2port valve doing heating.

Heating wiring advice

Pauly

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bill01803

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davesparks

Pauly

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Midwest

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Kamikaze

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Corbs

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Kamikaze

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Pauly

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Midwest

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Corbs

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Wilko

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Devonchris

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AJshep

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Sparkie30

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