Pump pressure variation

psd_3

I recently had a new riello 40-F5 installed. The tech initially fired up the new burner with a fuel pressure guage attached and adjusted the pressure to 170psi. Over the next 10 minutes while the burner ran, the pressure slowly dropped to about 160 psi and then he readjusted it back to 170psi.

Question is it typical for the pump pressure to drop a bit when the burner heats up. Or is there some other explanation as to why the variation from cold to hot? The pressure measure ment was made at the bleeder port.

Rookie_3

Pump pressure should be taken at the guage port. I like
the Mitco P 115-2M Kwik-check 2 pump tester instead of using the gge. port. You pull the jet line and put in the tester and you can test pressure and cut-off. One reason for a drop in pressure after bringing it to where you want it is by making the adjustment by bringing it down to it. Exam. if you want 170 psi DO NOT bring it from 180 psi down to 170 psi it may keep dropping after you have stopped turning the adj. screw, always bring it up.........160 psi slowly up to 170 psi.and stop and it should hold right there.
Hope this helps your problem....Dan

john@TR

Riello port

If I'm not mistaken the bleeder port is the gauge port on a Riello pump. Unless they changed it, I mean. I'm curious why he ran the pressure all the way up to 170, though. As for why it dropped, my guess would be the viscosity decreased due to the heat from gear friction in the pump. Is this a single line feed or double? (Two copper lines or one from tank?)Did the tech tell you why he increased pressure? Hopefully it was the design specs of the equipment it was going into? You don't want to get Ken started again. I swear that guy needs to stick to decaf!!!

Ken_8

ROTF,

LMAO

(rolling on the floor, laughing my a** off...

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Dave_16

Riello port - pressure variation

It's a straight gravity fed single line system ... no return to tank, no tigerloop.

170-180 PSI is what Riello/Buderus specify for the G115/40-F5 combo.

If the decrease in fuel viscosity can cause this type of pressure variation when the pump is warm, then is it best to make the pressure adjustment when the pump is at temperature, or when it's cold? Why doesn't the pump automatically regulate the pressure to prevent this type of variation?

dconnors

what is spec'd

If you have a G115/34 with a Riello F-5 burner the pump pressure should be 145 not 170. If you have questions please call 1-800-buderus

Firedragon_4

Sumptin is very, very wong!

john@TR

pressure

It was just a guess and the more I think about it the less likely it seems to have been caused by a change in viscosity. That much drift in pressure is not something I would expect to see (especially in a Riello) Perhaps you should consult G Lanthier @ www.firedragonenterprises.com. He wrote a book on Riello burners. Not sure if that's the right web address but it's a place to start a search.

Firedragon_4

Thanks for the plug John,

it's www.FiredragonEnt.com and I've never even heard that one before on ANY pump, sumptin is vwery, vwery wong!.