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Central Boiler control when Thermostats and Zone Valves are within units in Multifamily?
There is an existing 8 unit Multifamily building with a central boiler. Boiler pump is running 24/7/365 in primary loop. Secondary pump is running 24/7/365 and DHW is a sidearm with a tankstat that operates the DHW pump. Thermostats are tied directly to zone valves within the units and their is no homerun wiring back to the boiler room. We are replacing boiler (with mod/con), DHW tank and pumps. Existing boiler cycles like crazy between 140- 180 every 2-3 minutes.
What is most efficient way to control the boiler and pumps in this configuration? Does anyone know of an ECM pump that has a 0-10 Output to help control the boiler? Anythoughts on this would be appreciated.