New wireless thermostat for older boiler

[danielbb]

Hello

If anyone is bored and can spare a few moments of their time i would appreciate it.



I have boiler

http://www.ferroli.co.uk/product_documentation/DOMESTIC_ARCHIVE/Domina_80_E_Manual.pdf

and i have now bought a fancy wireless thermostat, which needs 240v to power the reciever.

http://www.sunvic.co.uk/documentation/datasheets/RFP Datasheet.pdf

Here are the pages i thought relevant from the above manuals.
Thermostat
http://i19.photobucket.com/albums/b177/dansarchive/therm.jpg
Boiler
http://i19.photobucket.com/albums/b177/dansarchive/bolier3.jpg
http://i19.photobucket.com/albums/b177/dansarchive/bolier2.jpg
http://i19.photobucket.com/albums/b177/dansarchive/boliera.jpg

It appears that the boiler circuit will only except 14v max via a simply switch type thermostat. I am i right in saying i cannot use this

I expected four connections two for power and two for the switch.


Thank you for any advice.

 

[Adam_151]

Boiler wants a set of volt free contacts, thermostat has a switched line, you cannot simply connect these together.

You could install a contactor, or see if you can locate a suitable thermostat

 

[danielbb]

Thank you!

yes

I thought that some type of relay but i wasn't sure what type.

Never heard the term contactor before I will have a look on maplin now.

 

[danielbb]

not sure what to use.

I have another thermostat, which was originally sent in error

http://www.sunvic.co.uk/select_range.htm

but it also looks as if it send high voltage to the boiler

 

[Adam_151]

in that link, which do you have, the 107? or the 207?

 

[danielbb]

207 mate.

the hot water fuction wouldnt be needed.

 

[Softus]

I thought that some type of relay but i wasn't sure what type.

http://www.tlc-direct.co.uk/Products/SR501.html

 

[danielbb]

Thank you.

where do them pins go

Isn't there a simple, two wiries in, two wires out thing i can shove in a housing directly about the thermostat?

 

[Softus]

where do them pins go

Didn't you scroll down on the TLC page?

Isn't there a simple, two wiries in, two wires out thing i can shove in a housing directly about the thermostat?

http://www.tlc-direct.co.uk/Products/SR501.html
http://www.tlc-direct.co.uk/Products/SR511.html

 

[danielbb]

thanks again.

doh!!!

i did scroll down, i didn't twig until just then, must be tired

 

[danielbb]

Great, now i know what you get,

is this common practise though? or am i being a plonker? am i likely to find a another wireless reciever to suit my needs?

 

[gas4you]

All wireless receivers are usually the same. They need 240V on the L & N power in terminals to operate the receiver, then the switch side of the receiver will be connected to the RT terminal block under the boiler which will only send 24V to the switch and back. No need for a contacter in this instance. The boiler is setting the low voltage for you.

I would personally use 5 core heat resistant flex to run from the boiler 240v connections and the RT connections that are next to it.

Keeps it neat.

 

[danielbb]

thankyou.

But im not sure where the swith live wire is supposed to go? theres no reference to one in the manual. Could you point me in the right direction?

Yes i was going to run the mains from the same place the boiler is connected, a fused switch next to it.

 

[danielbb]

x3 demand line?

 

[Softus]

All wireless receivers are usually the same. They need 240V on the L & N power in terminals to operate the receiver, then the switch side of the receiver will be connected to the RT terminal block under the boiler which will only send 24V to the switch and back.

Well I'm baffled. I can't see any terminal on the Sunvik transceiver documentation to accept a 24V supply from the boiler.

But then what do I know - I don't even know what "RT" means.