Blowdown for residential boiler procedure?

Scott216

I'm redoing my near boiler piping. I'm going to have ball valves on the risers and wet return so I can isolate the boiler from the system to do blowdowns. I have a residential boiler - Peerless 63-04. What's the procedure for doing a blowdown on a boiler like this? I know I'll need to close those valves and turn the boiler on. But I've heard the pressure should be higher. If so, what PSI should I go to? Do I need to override the pressuretrol or just crank it to the highest setting? I have a hot water garden hose rated at 180F, (McMaster 6285T29) that I can connect to the boiler drain and then go into my basement sump pump.

JUGHNE

Is your sump pump plastic or cast iron?

Jamie Hall

no need to go over 2psi, but if you have a vapourtrol you'll have to isolate it (should have a valve... some even do!)

Scott216

JUGHNE said:

Is your sump pump plastic or cast iron?

Cast Iron

EdTheHeaterMan

You need to isolate the pressure control or jumper the terminals so when the contacts open, the circuit to the burner is not interrupted. Changing the adjustment is never a good idea. Sometimes you never get it back to where it was before you changed it.