Riello F5 Fast, Fluctuating Pump Pressure

[gschabel]

Greeting all.

Have a Riello F5 for a while, love it. Back when it was on a single line system, I could check/dial in the pump pressure and the gauge read and responded to what I would set without much gauge fluctuation. The gauge remained steady at whatever pressure, both pre and post purge.

We have changed to a 2 line system with our new oil tank, and when I check the pump pressure, the gauge fluctuates quickly (actually looks like fast fluttering) within a 20psi range. I can adjust the pressure, but it is not as responsive as I recall with the single line system, and as I turn it up, it does revert back (lower) a bit with each increase, and seems not to want to go higher than 160psi. (I didn't want to push it either)

Question: Is this normal for a 2 line system with Riello or is the pump malfunctioning?

This is not a Tigerloop, just a return to the tank. The burner is working without issues.

Thanks in advance for any insight on this.

 

[Fitter30]

Pages 11 to 14 hope the pump seal isn't damage

https://www.google.com/url?q=http://bostonheatingsupply.com/Riello/Riello%2520F3%2520-%2520F5%2520installation.pdf&sa=U&ved=2ahUKEwjq5NXuk9OKAxWXvokEHfOVLR0QFnoECAoQAg&usg=AOvVaw0OsiTXX0C_rzc9ThE0uUns

 

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[Fitter30]

Pages 11 to 14 hope the pump seal isn't damage

https://www.google.com/url?q=http://bostonheatingsupply.com/Riello/Riello%2520F3%2520-%2520F5%2520installation.pdf&sa=U&ved=2ahUKEwjq5NXuk9OKAxWXvokEHfOVLR0QFnoECAoQAg&usg=AOvVaw0OsiTXX0C_rzc9ThE0uUns

Solving Rumbles And Pulsations | Beckett Corporation

www.beckettcorp.com

 

[gschabel]

Thanks Filter30. Yes, everything is and always has been setup per the Riello manual and specs. I have ordered a new dampened pressure gauge in case that might be the issue, but am doubtful anything will change and will still get fast fluctuations on a pressure test. Would like someone to chime in if they have seen this before. If it is a pump issue, so be it, but don't want to change it if that is not the issue. Burner is running fine and at 0 smoke.