Removed four existing SR501 relay controls and installed a single SR504 relay control to properly manage all circulator pumps and thermostat connections. All circulators and thermostat wiring were landed and verified at the new control. Installed a Fast-Stat system on the upstairs zone to accommodate limited existing wiring and installed a customer-supplied Ecobee thermostat. Ran new control wiring from the SR504 to the boiler aquastat, replacing the previous jumper configuration. This now allows the boiler to operate only on a verified call for heat rather than continuously running off the high limit. Tested operation of each thermostat and corresponding zone to confirm proper circulator engagement, boiler operation, and system shutdown. All zones were labeled accordingly. System is operating properly at this time.
