installing thermostat

[bbuk]

i have the following boiler

the manual states that i should connect a room thermo stats to th terminal 1 and 3.

the thermostat stat it self has more than 2 connections.

it doesn't actually say what wire should be connected to whic terminal.

does any one know what those two wires are for. on the thermo sta there is L, N and eath

the boiler manual says do not connect live wires to terminals to whic the room thermostat must be connected.

all it shows is a picture of a thermos stat and the two wires shove in to terminal 3 and 1 on the connector of the boiler.

stupid boiler manual, it doesn't give clear information

-- bbuk

[John Rumm]

I have wired a stat on a Biasi similar to this....

Yup. Without a stat fitten there is a loop of wire that joins 1 to 3. To fit a stat you have it such that its contacts are between 1 and 3. When they close the boiler fires (if permitted by the timer)

Sounds like an eletromechanical stat that requires a neutral as well. If you want to use this then you need to wire it with multicore cable and take a neutral to it as well (without the neutral it will still work but you will get large temperature swings between its on/off cycles making the house rather uncomfortable. You can collect a neutral from the "mains in" terminal block directly adjacent to the stat one.

You would in reality be better off with a programmable stat like:

only need a two wire connection and allow for much greater flexibility in the control of the house temperature. If fitting one of these then you can basically create one "program" on the boilers timer to allow the boiler to run all the time, then deligate the actual control of the boiler to the stat.

[Andy Burns]

Wow, it certainly seems like thermostats are in the collective conscience at the moment!

Is this normal "in here" at this time of year? Or have energy prices this year raised the normal level of interest?

[bbuk]

so shall i connect the N and L to the boiler connections 1 and

-- bbuk

[John Rumm]

Connect 1 and 3 to the stat such that they are shorted when the stats normally open contacts close.

[Matt]

This time next year, assuming the lights are still on it will be full chat about how to build a fireplace and what is the best way to sharpen an axe - everyone will be out in the woods chopping down trees as the Russian oligarchs exert their power over the Europeans.