Re: Oil furnace zone 3 help
No response and I am heading out so I am just going to make a guess.
Zone 1 and 2 are normal heating zones controlled by wall thermostats. Zone 3 as wired is the zone control for domestic hot water. If true and you want to add a 3rd heating zone you will need a bigger control board with at least 4 zones. Again this is just a guess without knowing anything other than what is posted.
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