baxi duo-tec 33 he a

[desrob]

i serviced this boiler today and i done a gas rate, it came back on full rate at 2.25m3/hour ,- 21.69kw nett. looking at the mi the boiler should be running at 3.39m3/hour - 32.69kw nett . the thing is when i looked at the benchmark the figures the installer put in mirrored mine 2.25m3/hour - 21.69kw, any ideas

 

[villa_tom]

Was the inlet pressure ok? And the FGA readings?

 

[desrob]

Was the inlet pressure ok? And the FGA readings?

both ok tom ????????

 

[Billy Bob Bob]

good hot water flow ?

 

[desrob]

yes 14 l/m

 

[Billy Bob Bob]

inlet pressure ok?

 

[desrob]

yes gas man 20mbar

 

[villa_tom]

I'll be interested to see what this problem is, I had a vaillant last week with the same problem. Turned out to only be getting 9mb on full rate which cocked up FGA readings aswell.

 

[desrob]

well to be honest tom it's got me beat !!!

 

[Billy Bob Bob]

would have a word with baxi tech its undergassing for some reason,gas valve fault,wrong jet/jet/burner restricted,i take it you have checked/ruled out fga readings under 0.004

 

[desrob]

but as i have said it has been doing this since installed

 

[desrob]

fga results on max were ok but when on min they were a bit out and had to be adjusted,i;ll give baxi a ring and let you no how it goes

 

[Billy Bob Bob]

but that dont make it right,it dont make it dangerous either installer should have kicked it in when it was in warranty,did you do a full strip down service or fga readings only?

 

[desrob]

just fga ,i did not how ever complete service as i said i was not happy with readings and i would be back to complete.

 

[Billy Bob Bob]

be interesting what state its in when you strip it down,dont forget combustion gasket should be ok but advise custard a new one may be needed or just fit a new one anyway and bill accordingly

 

[desrob]

will do that i'll let you know, but have a feeling this one not going to be straight forward

 

[Billy Bob Bob]

will do that i'll let you know, but have a feeling this one not going to be straight forward

have you done a full strip down on one of these before?

 

[villa_tom]

You could have a problem with the meter reg maybe? I suppose you could run it on full rate with the manometer connected to the inlet to see if the pressure fluctuates while in use.

Its a strange one this

 

[Billy Bob Bob]

You could have a problem with the meter reg maybe? I suppose you could run it on full rate with the manometer connected to the inlet to see if the pressure fluctuates while in use.

Its a strange one this

good call had that before,just thinking out loud restriction in gas pipe connection from gasvalve to burner possibly?worth checking anyway

 

[mickie]

might be a silly answer but isnt it just that the boiler might have regulated down the burner while you test it for an minute or 2, depending on meter ?

 

[Billy Bob Bob]

might be a silly answer but isnt it just that the boiler might have regulated down the burner while you test it for an minute or 2, depending on meter ?

should get full gasrate when flat out to dhw,meter should not have a bearing

 

[mickie]

i know, ive seen them regulate down before, worth checking

 

[Billy Bob Bob]

i know, ive seen them regulate down before, worth checking

faulty Governor not meter back to villa toms suggestion

 

[mickie]

i was thinking blocked hot water heatexchanger

 

[REDSAW]

he'd be struggling to get 14ltr a minuite if it was?.