Discuss 2nd Zone UFH and 2nd pump in the Central Heating Systems area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hi,

I require a second pump connected to a 2nd zone.

System is S plan, just a bit stumped with how you only get the pumps on that are calling for heat with only one boiler.

Zone 1 at moment pump and boiler comes off 10 which is right but the 2nd pump has to go in 10 as the neutral and earth are common I can't see how you stop the both pumps firing up when only 1 zone calls for heat.

Only way I can see is a relay or contactor but I can't remember the basics with them been that long since used one.

Anyone got any diagrams that can help??

Thanks Rich
 

Wilko

-
Arms
Esteemed
Hi - this thread’s got some info on the subject from @Leesparkykent which helped me :) .

 
2nd valve used to control pump,room stat will Ctrl this,switch valve,which will operate that pump.
see what you mean with the signal to the boiler & pump.
The orange from the valve could feed the pump,but would not on that zone fire the boiler
 
  • Thread Starter Thread Starter
  • #6
2nd valve used to control pump,room stat will Ctrl this,switch valve,which will operate that pump.
see what you mean with the signal to the boiler & pump.
The orange from the valve could feed the pump,but would not on that zone fire the boiler
Yeah bit of a head scratcher, never know the Ufh pumps might have their own wiring boxes that have the next relays.
 

Midwest

-
Arms
Esteemed
If I recall the last one I did, its was S-Plan+, with the UFH having its own 2 port valve, and the UFH manifold & pump with live feed, and switch live from room stat to the 2 port.

The UFH manifold will then blend the water in the UFH loops, with the heated water from the boiler, to the required temerature. Otherwise the floor would be too hot to walk on.

1575730073273.png
 

davesparks

-
Mentor
Arms
Esteemed
For multiple pumps you will effectively need a relay for each pump fitted.
You must always have a pump connected to the boilers pump overrun terminal, so if there isn't a seperate circulating pump for this purpose you will need the relays to always leave one pump connected even when all zones are off.
 

Midwest

-
Arms
Esteemed
Think we might be at cross purposes. The UFH pump, has nothing to do (socially as it were) with the CH system. It just lives in a world of its own circulating water around the UFH loops.
 

davesparks

-
Mentor
Arms
Esteemed
Think we might be at cross purposes. The UFH pump, has nothing to do (socially as it were) with the CH system. It just lives in a world of its own circulating water around the UFH loops.
I take it you've actually seen the system the OP is working with then?

Not all systems work like that.
 

Midwest

-
Arms
Esteemed
I take it you've actually seen the system the OP is working with then?

Not all systems work like that.
Ok stand corrected then.

However, all the UFH systems I've worked on, come as kit to add to existing CH systems. Unless your talking of a bespoke UFH system, for large premises. Bit like the place I work in now, which has a large circulating flow & return, and the manifold takes its blend from that.
 
Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members

Reply to 2nd Zone UFH and 2nd pump in the Central Heating Systems area at ElectriciansForums.net

uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members
Top Bottom