In order to replace a baseboard
radiator, I need to drain out the zone feeding the radiator. My heating system is System 2000 EK-1. In the attached picture, you can see three zones each with its zone valve, shutoff valves, and drains. The zone I need to drain is the middle one.
In the picture, toward the front is the hot water feed line from the boiler feeding into the three zone valves, each followed by a shutoff valve. Towards the rear, you see the three return lines with drain valves and shutoff valves.
Can someone help me with step-by-step instructions for draining one zone on this boiler? Once I've replaced the radiator, how would I refill and purge the zone? Thanks!