Riello ???????? (SE)

Steve Ebels

I have a Riello F-5 that has intermittent starting problems. When it fails to start, I can reset it and then briefly restrict the air to the burner by holding my hand over the intake. When I do this it will fire instantly. All parameters of a combustion test look good. Draft over fire is +.01", draft in the breech is -.04" (that's as low as I can get it) CO2 is 12.2%, O2 is 4.9%, CO is 3 ppm, 0 smoke. If I throttle the air back it will light off reliably every time but it also makes about a 2-3 spot on a smoke test.

What's going on with it? What am I missing?

heatboy

What..........

boiler is it in? What type of nozzle? The Series 40 F5 seem to work best with Delavan "W" nozzles. Most of the ones I have use 60° spray patterns.

hb

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Bill Nye

Make sure

your electrode gap is wide enough. Just a little bit wider than you normally think it should be.

techheat_2

Check

Pump pressure and turbulator setting?

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techheat_2

What type of Unit?

with a draft loss of .05 thru the boiler? Is it clean?

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Big Ed

Nozzle

Replace the nozzle....

don_7

I

too have seen this when the burner cone is warp and
not perfectly round or in line with the blast tube.

mph

Riello

I had the exact symptoms on a Viessmann oil chassis burner a couple of years ago. Turned out to be a bad flare by the oil tank that would allow the oil to drain back into the tank and introduce a slug of air into the line. Do you have a Tigerloop on this?

Jeff

steve_26

Gap

check gap should be at 1/4".
had one 3 weeks ago, new install.. Having ignition problems called the local rep he told me to reset the gap from 4mm from thre factory to 1/4"...they changed the transformer..

Steve Ebels

It's on a Viessmann

Vitorond VR2-50. Gravity feed single pipe fuel line setup. Nozzle is a new(actually several) Delavan 1.10 60* A as per Viessmann spec. I have also tried Hago W series suggested by Viessmann. Pump pressure (175 psi) and all burner specs (turbulator @ 2.0, air gate @ 3.4) are nailed. I haven't tried the wide electrode gap. Where did that come from? Riello calls for them to be quite close. The boiler is spotless inside, it runs on low sulfer #2 oil at a steady 87%. There are also no problems with the burner head or cone.

Firedragon_4

Set the electrodes with

the shaft of a standard #2 phillips screwdriver, works every time for me.

Steve Ebels

You mean

Set 'em so the width of the shaft will slid between the electrodes? Roughly 1/4" gap?

Firedragon_4

That's it. It's an old service trick

that I teach in my advanced Riello Seminar. So far, it hasn't failed me in 23 years.

Earthfire

gap

use the magnet on that cute little screw driver Riello gives you. if it fits between the electrodes your gap is right.

Steve Ebels

'nother ?

Does this electrode spacing apply to all F series burners or just 5's?

Jed_2

F40-3 & 5 and M3,5,10,15,20

Steve, It is a fluke, not by design, but it is exactly the correct gap spacing. Also, just a thought, but 0 is NOT 0 on the turbulator disc setting bar. The first line is. So, a 2 setting is the third line. Probably you knew this, but just throwing it out there.

Jed