Flue thermostat switch

[Central]

Laddomat Flue stat here too - works a treat.

 

 

50-300C FLUE THERMOSTAT LADDOMAT BIOMASS LOG PELLET BOILER WOOD STOVE | eBay

 

 

Thanks.

 

I have now it one of those. The wiring diagram shows it is wired in conjunction with a switch. Do I need to buy this also?

 

Can you shed some light as to how to wire it up to the laddomat?

 

Thanks

[hardtop110]

The circulation pump on the laddomat should be wired in with a switch - mne is just a light switch. The thermostat needs to be wired into that switch so that even n the on position, the feed to the circulation pump is only live when the stat is open e.g. The flue is up to temperature.

 

There's a wiring diagram here http://www.dunsterheatltd.co.uk/images/Laddomat%20Flue%20Thermostat%20-%20Laddomat%20Installation.pdf

 

Good luck

[Central]

Ok

 

All wired up now.

 

If I set the flue stat to 100C, the boiler races up to the 90's and the gauges on the laddomat don't move.

 

If I then drop it to 50C, hearing the stat click on the way,

The temp on the boiler drops and the laddomat gauges rise.

 

So that all seems good.

 

Question though. What happens when in slumber mode at 90C on the boiler?

 

The thermostat could well have stopped the laddomat pump from running. Is there a danger of boil over on the boiler?

[hardtop110]

 

Question though. What happens when in slumber mode at 90C on the boiler?

 

The thermostat could well have stopped the laddomat pump from running. Is there a danger of boil over on the boiler?

 

Yes - mine does it from time to time, but it's no real drama. In theory, the loading circuit should run under gravity, without the Laddomat pump running, but with the valve open. If it's not plumbed in properly e.g. Pipe runs too long or not enough vertical distance between flow and return it can boil. When mine does, it vibrates and boils out of the top of the vented cylinder through the overflow - no real drama, but if it was plumbed in proper, it wouldn't happen - I'll get it sorted one day.

 

In theory, with a 75 degree Laddomat stat, you're able to set the flue star switch as low as 50 degrees, or even lower, because you won't lose any heat below 75 degrees even with it running. The loading circuit will cool down, but that doesn't matter in the grand scheme of things.

[Central]

Thanks again. I fixed the sensor to the underside of the flue, just where it becomes twin wall. here the temp on the probe doesn't get that high. so i might move it to the top so the switch point is a bit higher than 50C. Maybe use a longer screw also.

 

I have to say I am not that impressed with the fixing supplied. For a few pence more it could have been secured by two screws and been a lot more solid.