Too high/low heat input

[Bhoydavid]

Hi all, I've never actually had it occur but I was just wondering when servicing what is the procedure if an appliance gives an above maximum KW/mbar rating or below minimum KW/mbar rating. Thinking back to my ACS and can't for the life of me remember being told about this. Cheers

 

[Ermintrude]

If inlet pressure low and gas rate high it's ncs unless it's causing an issue with other appliance I.e hob or fire then it's AR . Over gassed cause problems like lift and soot.

 

[lame plumber]

if it gives below kw rating it might need cleaning ie burner nozzle etc, and if its above the nozzle may be worn, if its a boiler it may need setting up as per mfis. basically if your servicing something it up to you to leave it set up as per mfis

 

[Pssst]

Well a starting point would be,what sort of burner technology are we talking about? Is it natural draught or forced draught?

 

[Ermintrude]

Fuel be a good start

 

[arran197]

It all depends on by how much. 10% under and 5% over is ok anyway. Any more than that and you might need to start investigating. If it's a modern boiler, the throttle may need adjusting on the gas valve, the inlet pressure may be incorrect, but providing it is working safely, it's a judgement call. You could test everything else, fga, inlet pressure, case seals, if everything else looks ok and you can't see what the cause is, I wouldn't be too concerned. Older boilers, could look at injectors, burner pressure, flue.