Undersized nozzle installed (.85), boiler lists 1.1 to be used.

Craigs

Question that will be good for the wall.



On my last annual cleaning, when the service person replaced the nozzle, he took out a .85 GPH, and replaced it with a .85GHP, but the specifications on the outside of the boiler/blower called for a 1.1GPH. He said this was odd, but said if it was working to stay with what it had in it.



Thoughts? What is the difference here, Will I get more or less life out of the boiler, any more efficient, etc?



Boiler: Weil-McLain Boiler P-SGO-4 Series 3 for heat and hot water.

icesailor

Nozzles:

Is there any holes in the smoke pipe when it leaves the boiler?

Me thinks, NO. If he can't explain why he put a .85 GPH nozzle when it calls for a higher one, and he doesn't know that the reason for a smaller nozzle has to do with the GPH flow at what pressures, he clearly is a knucklehead.

Before I left, I had done a lot of repair and re-piping on a Power flame GO-3 combination gas/LP-Oil burner fired at 25 GPH on oil. The manufacturer's rep was required to be there for the initial firing as per gas code. Although there was a fuel pump pressure gauge on the pump, I was asked to install a 300# gauge on the nozzle line. It was a learning experience to see visually what the change in nozzle pressures did to the CO and combustion numbers.

Anyone not using combustion analysis equipment is just peeing in the dark and hoping that they don't pee on their leg.

billtwocase

pump pressure

The pump pressure is most likely 140 PSI. A .85 gets you close to that max firing rate, and that is all it is-a maximum firing rate for that boiler, doesn't mean that it needs to be firing max, depends on load.