I need to drain (and, later on, refill) our hot water heating system in order to reinstall a baseboard radiator on level 1 of our house.
I need advice re. draining the system (and later refilling it.) The baseboard radiators do not have bleeding valves, and I am concerned about (1) water not draining down properly and (2) air not getting bled and pockets forming later on when the system is filled up again.
I read page 26 of http://www.burnham.com/PDF/htghelper.pdf, but am not too sure of the sequence in which the various drain valves on the system should be opened/closed, and whether I should isolate (i.e. not drain) any parts of the circuit.
I drew up a diagram of my boiler setup + pictures, and they can be found at here.
Thank you in advance for the help!