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controls for a H/W oil fired Boiler..an upgrade
Need to pick your brain..How can I change a 3 zone H/W Boiler with all relays to primary and secondary piping? The primary circulator I would want to run only when there is a call for heat and not continuously. Older boilers are not set up for this and I'm not sure how to get that primary circulator to run when any of the three zones are calling. Thanks in advance, Duff