I have a single family home with baseboard heat on first and second floors,i watched your video on how to bleed air out,i don’t have zone valves all that’s there is a taco circulating pump and above it there is a pipe that goes up and a tee with another pipe connected like a y,they both have a shut off valve and above them another valve to open just like in your video but no zone valves.how do you bleed the pipe without a zone valve.the pipe on the left of the y goes to first floor and that heats the pipe that goes up is for second floor and there is air in that line,how do you bleed it without a zone valve thanks,gas boiler with circulating pump