Purging air with no zone valve

namahs

Our heating system has been making alot of noise and not heating properly. We just moved and in this house, the hydronic boiler system does NOT have a zone valve and I am not sure how to drain/purge air from the system. Would the steps below work for me to get the air out?

https://imgur.com/a/0sznEvs (pic of system)

1-Turn off power to the boiler
2-Hook up hose to the top valve/garden bib
3-Close the valve below the valve with hose
4-Open the top valve with the hose and start the process

As you can see in the picture, there is no zone valve. So does this mean I can ignore that step and I can drain/flush the system of air with no issue? When I turn off the boiler, there is no manual open for me to open since there is NO Zone valve, would the water go through? I am new to this and dont want to break anything in the system and have to end up calling a professional. Thanks in advance.

STEVEusaPA

System off, put hose on where you indicated, put hose in a bucket in a sink. Close ball valve.
At the same time, open hose bib, and open fill valve, running water thru the system to maintain at least 12 psi while monitoring the bucket. It's a bit of a juggling act, but you don't want the pressure to drop below 12 psi, and you don't want it near 30 psi.
When all bubbles have stopped in the bucket, at the same time, close hose bib and close fill valve. It's easier and more accurate to just kink the hose to control flow. Then you can let a little water out until you're back to 12psi or whatever you need your cold fill pressure to be.
Don't forget to open up your ball valve before turning the system back on.
Based on how it's piped, recurring air issues may be a theme

namahs

Thanks for the confirmation and tips. I definitely need to take care of this, tired of hearing ocean waves when the heat is on.