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Ifc circulators with zone valves

RayH
Member Posts: 89
in Oil Heating
Does a system that has zone valves and no flow check require an Ifc circulator
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Comments
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Usually no, but it depends on how its piped. Are you getting ghost flow in the zones not calling for heat?steve0
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If your zone valves are controlled by your t-stats directly and you have a indirect hot water tank that has DHW Priority enabled, the zone valves will remain open when the indirect tank circulator is running.
If you didn't have a flow-check on/after the spaceheating circulator in this case you would get reverse flow through the spaceheating loops with energized zone valves.
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