Riello RDB 1 at the limit of settings

[Bunker]

I must say i welcome your input, nice rational engineer talk.
I would be hesitant to leave it at 12% - you may well go back to a sooty boiler before long. Id be as above, dropping the nozzle or the oil pressure.

Looking forward to hearing your updates.

 

[Roger Welton]

IIRC the RDB's fitted to the grants are specced slightly different to the 'off the shelf' variaty, I want to say they have a different fan scroll, and the baffle plate between the fan chamber and the rear of the nozzle chamber is different also.

 

[Dotty]

That the Oz model Rog?

 

[Roger Welton]

It is mate 🙂

 

[keltoyboy]

Had similar today with an rdb1 in a grant combi...... nozzle .75. 60 eh and air wide open and still 12%co2...... can't downrate as all output needed (and more)

 

[kimbo]

Diid you disconnect air snorkel and test in case flue seals are lesking

 

[Bunker]

Had similar today with an rdb1 in a grant combi...... nozzle .75. 60 eh and air wide open and still 12%co2...... can't downrate as all output needed (and more)

First thing with the Grant combi is to check the fan housing, probably full of water 🙂

 

[Roger Welton]

First thing with the Grant combi is to check the fan housing, probably full of water 🙂

Whenever that has happened with me it has ended up blowing the pcb.

 

[WHPES]

Had a similar problem once and found it was the filter in the analyser soaked in condensation when doing an external boiler set up in sub zero conditions.

Check / try adjusting distances between nozzle and flame spreader of the blast tube.

 

[DJS55]

As an update to the original post: The Co2 now reads 11.6% Flue temp 180 and excess air around 39%. Air adjustment is now in the range where i expected it, as opposted to the end of the travel and all is well!

Issue there was a restriction in the air intake and even though I could see day light when I first checked it; it was enough to cause the problem i.e more adjustment on the Burner to acheive the air flow required. New air intake fitted, a safe appliance and a happy customer.

 

[keltoyboy]

was the slide not opening fully!!!!

 

[Lou]

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