bermuda 552 pump over run needed

[tamz]

Setting 1 is approx 130ºF (54ºC) High is approx 180ºF (82ºC)

 

[shorticus]

cast and condensate don't mix for sure, I'll give Baxi technical a shout tomorrow see if they can give me some expected temperatures for the stat settings, I'm betting that this stat is giving quite high temps in relation to the numbers hence the overboiling at anything above 2.
LTHW should be around 70-80 degrees which is what I've got so I'm also betting that's usually achieved at a stat setting of around 3.

I'll let you know what they say, cheers for the head's up

 

[shorticus]

Setting 1 is approx 130ºF (54ºC) High is approx 180ºF (82ºC)

Well I think these figures would confirm my suspicions, the stat is inaccurate.
Also if the temp is usually 54 degrees at setting 1 the POC will condense thus rot the exchager

 

[tamz]

As Gasman said.
Keep it set to 2 minimum. 10ºF between the numbers.

 

[shorticus]

As Gasman said.
Keep it set to 2 minimum. 10ºF between the numbers.

I've tried setting 2, it overboils and fills the header tank up with scallding water.

The stat is working but its just inaccurate, as said before system water is 70 plus so there shouldn't be any condensate formation unless I'm missing something?

 

[tamz]

Leave it on 1 then as the temperature obviously well up.
The stat may be out or the boiler coated with sludge or scale and give a false reading. The temp will be above the set point before it reacts.
This is common on older boilers.
Some X200 may help.

 

[shorticus]

I'll keep an eye on it, I don't mind if the stat is inaccurate as long as its working safely. The missus is talking about wanting an open fire so I may fit her a new wall mounted regular later in the year, I quite like the ecotechs and the prices are reasonable