Normal S Plan + water heating for swimming pool

[OilServe]

Hi

I have a customer with normal S-plan for the house + additional zone valve, pump and stat to run a swimming pool heat exchanger. All is running off a single oil boiler.

I need to control the swimming pool 'zone' and guess I will need to use relays to control the two pumps and single boiler separately.

The question is does anyone have a wiring diagram for S Plan to include 3 zone vales, 2 pumps and 1 boiler.

Thanks

 

[dcawkwell]

I would use a pipe thermostat on the pipe to the pool heat exchanger to switch the pool pump on.

The rest is just normal each zone valve will turn the boiler and it's pump on to supply the heat.

 

[jackthom]

I suppose the problem is that demand from any zone will cause the boiler to fire and both pumps to run together.

I think you would need two double throw relays to separate the microswitch feeds to boiler and pump. One relay for the normal two zones plus one for the additional pool zone.

 

[Terrywookfit]

Wire output from pool m/v to pool pump and n/c relay contact.
Boiler to common on same relay.
Connect ouputs from c/h and dhw valves together. use this to energise relay + feed other pump and a connection to n/o contacts on relay.

 

[matt1e]

all you need is one relay in parallel with the pools valve actuator to run the secondary pump
wire the system as s-plan plus and connect the relay coil to the call for heat along with the pools zone valve

Matt

 

[jackthom]

Not sure about this, would the boiler call for heat not get back to the primary pump as well? Sorry it's difficult without diagrams, here's a crap drawing...

Untitled

• jackthom
• 22 Nov 2013
• 1

 

[matt1e]

Not sure about this, would the boiler call for heat not get back to the primary pump as well? Sorry it's difficult without diagrams.

Yes, but you need it too
the system pump will serve the hex primary

Matt

 

[matt1e]

actually thinking about it I'm not sure if you would need any relays as the pool pump usually runs permanently I will knock up a quick sketch to show how it is done commercially
I cant comment on domestic installations so perhaps the Op could enlighten us on the plumbing arrangements

Matt

 

[matt1e]

Ok a quick sketch this is how it's done commercially

View media item 69427
Here the pool pump runs continuously while the pool is getting used (note the majority of the flow runs through the hex bypass)

there is usually a temp sensor fitted as shown that controls the modulating valve supplying LTHW to the heat exchanger via either a local stand alone controller or BMS

I have shown the valves as diverters as they usually are and for boiler read heat source.

 

[matt1e]

This may suit the ops system

View media item 69432

 

[OilServe]

Thanks for all your replies, I should be able to set this up now.

Cheers!!

 

[matt1e]

View media item 69434
You're welcome

 

[SimonH2]

I hadn't spotted this thread - had a conversation via PM.

The sketch I gave him was this one :

Untitled

• SimonH2
• 22 Nov 2013
• 1

How to use relays to switch the boiler in an S-Plan system with 2 pumps

Though reading the rest of the thread, I realise I've gone a bit overboard and the pumps can be wired in parallel with the relay coils - thus saving a contact on each relay.