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Removing toe kick heater on HW baseboard system with 5 zones

Rickl750 Member Posts: 1
Hi Guys,
I’ve read a few post already on how to do this but non discussed a system with multiple zones. On my system I can close off the zone I need to work on, so I’ll remove the unit and connect the two pipes together. My questions are:
Do I have to drain the entire system or can I just drain that zone?
I don’t see a pressure relieve valve, how to I do this on that one zone?
Does the system restore the water and pressure on its own once I open up the zone I worked on or do I need to do anything?
Btw the system is a Peerless Boiler series WBV/WV and it’s 3 years old.
Thanks for your assistance.