connecting a relay box to a boiler

Bogdan · 4 Jul 2011

Hi everyone! Any ideas on connecting a BDR91 to biasi boiler? Something more comprehensive than a white black diagram if possible at all? Many Thanks in advance! Cheers!

picasso · 4 Jul 2011

What biasi boiler and whats wrong with a black and white diagram as long as you understand it ?

DP · 4 Jul 2011

Why complicate things? What is wrong with the wiring diagram? Will you understand what the circuitry does if you had a full schematic circuit diagram?

Have not looked at unit in question but similar units would have 5 connection of which only two would be needed. These would be L and N and C and NO, C and NO would be connected to the boiler and L and N connected to L and N on the boiler.

Agile · 5 Jul 2011

Older Biasi boilers were not designed to have a mains feed to provide a call for heat.

They must be fitted to a two wire switch!

Tony

DP · 5 Jul 2011

They must be fitted to a two wire switch!

That is what C and NO comprise of, two wire on off circuit

D_Hailsham · 5 Jul 2011

DP said:
They must be fitted to a two wire switch!

Click to expand...

That is what C and NO comprise of, two wire on off circuit

But the BDR91 Relay box has terminals labelled L and N (obvious) as well as A, B and C (not so obvious).

PS For those who don't know the BDR91 is the receiver for Honeywell wireless thermostats and programmable thermostats.

Agile · 5 Jul 2011

I expect the C is the common and switches between A & B. If so then you would use C & B assuming the C & B are connected when unpowered.

But its easy to test for that with a meter.

While doing that to avoid damaging the boiler it might be sensible to test that there is NO voltage on the A B C terminals.

The instructions my well be all thats needed if the are correctly interpreted.

Tony

D_Hailsham · 5 Jul 2011

Agile said:
I expect the C is the common and switches between A & B. If so then you would use C & B assuming the C & B are connected when unpowered.

That's wrong, which isn't surprising as your just guessing.

Look it up if you don't know.

DP · 5 Jul 2011

While doing that to avoid damaging the boiler it might be sensible to test that there is NO voltage on the A B C terminals.

I have yet to come across a time switch or a RF reciever that did not have voltage free contacts. If there is one please point me in the right directioncode

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connecting a relay box to a boiler

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