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Need help on how to purge the air out of one of the zones
I would like to purge the air out of one of the zones and need some assistance. First, please allow me to explain if my understanding of my boiler heating systems is correct. From the attached pictures, I draw blue lines show how the water flows into to boiler from the street and after the water is inside the boiler, the boiler heats up the water and then supplies(red line) the hot water to the baseboards and then returns back(black lines) to the boiler for reheating via those zone valves. Please let me know if my understanding is correct and If I want to purge the air out of that one of the zones(circles in blue), can you please tell me what steps need to be taken?
Any help will be much appreciated!!