Pressuretrol settings

Ollie_Hopnoodle

Do these Pressuretrol settings look right? Thanks. Burnham in5i 

EdTheHeaterMan

This looks like a 2 PSI max with a .5 PSI cut in. That is not so bad. Does the burner cycle on the pressure? That is the real question. If the system never gets to 2 PSI then you are just fine. If your boiler short cycles, then the 1.5 differential may be an attempt to minimize the amount of cycles.

Jamie Hall

Assuming this is a one pipe or standard two pipe system, they're OK.

Ollie_Hopnoodle

Thanks, yes this is a standard one pipe system. I don't know if it has been short cycling, it's my tenant's boiler. Seems to be running ok though. The boiler is about 100 sqft bigger than the EDR of the radiators though.

ethicalpaul

Cycling on pressure is better than letting the pressure go higher, so if you do find out it is cycling on pressure, just make sure the main venting is sufficient and let it cycle, IMO. I'd even lower the Main setting to 1.5 and the Diff setting to 1.0 so that it would cut out at 1.5 and cut back in at .5

There is no possible good reason to keep firing the burners when the pressure is at a high level like 1 PSI or greater. All you're doing is paying money to build pressure, nothing else.

Keeping it at a steady thermostat setting will minimize the length of calls for heat and reduce cycling too.

Ollie_Hopnoodle

thanks @ethicalpaul there are no main vents installed. I have to put one in, actually.

ethicalpaul

That's actually very good news. You may very well find even your oversized boiler runs great with good main venting.