ecoFIT pure 830 temperature control

[Wibbly]

I have chosen to set the CH temp to 63, but often find the water temp is displayed as high as 66, even when heat is staill being called for. Is this to be expected/normal?

 

[Deleted member 120897]

Quite possibly pump overrun?

 

[Wibbly]

Could be, but it's a modulating boiler and CH is still calling for heat. It's as if it can't control the temp well.

 

[John.g]

I have chosen to set the CH temp to 63, but often find the water temp is displayed as high as 66, even when heat is staill being called for. Is this to be expected/normal?

The displayed temperature is often taken from the cylinder top whereas the cylinder stat is installed ~ 1/4 the way up the cylinder, this is to start heating the water as soon as a relatively small volume is drawn off, say 30/50 litres. The coil is heating from the top down so your stat might call for heat at (63-5) 58C even though the cylinder top is slill at 63C and by the time the stat is satisfied again at 63C then the cylinder top wil be higher, in your case by 3C, 66C.
I use a spare contact on my solar controller + PT1000 (very accurate) sensors to open/close the coil motorized valve at 55/60C, the sensor temperature is exactly60C at shut off but the cylinder top varies between 62/64C depending on hot water drawoff.
Probably if the circulation through the coil was from the bottom to the top then there may be little or no variation?.

 

[John.g]

Sorry, misread you post, forget above.

The boiler should maintain the SP but will only do this if its minimum output is > the CH demand, if not, then it will continue to rise to normally SP+5C so will then cut out if it reaches 68C in your case

 

[Deleted member 120897]

If it’s relatively new, the link may have been left in.

 

[Timmy D]

If it’s relatively new, the link may have been left in.

I don’t think the issue is with the boiler on constantly (link could be correct for this problem), but with the boiler temp over shooting the set flow temp.

 

[Deleted member 120897]

I don’t think the issue is with the boiler on constantly (link could be correct for this problem), but with the boiler temp over shooting the set flow temp.

Thanks, I was going off the curve ball of

Could be, but it's a modulating boiler and CH is still calling for heat. It's as if it can't control the temp well.

 

[John.g]

I don’t think the issue is with the boiler on constantly (link could be correct for this problem), but with the boiler temp over shooting the set flow temp.

So shouldn't stop the burner firing at SP temperature or it is and just going overtemp a little after burner shutdown?

 

[Timmy D]

So shouldn't stop the burner firing at SP temperature or it is and just going overtemp a little after burner shutdown?

I’m unsure.

We need more info really.

TBH, without other problems, I probably wouldn’t spend anytime fixing what is pretty much a non issue.