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Installation of customer supplied Smoke Detectors and Relays for both Furnace systems of the Tech Center. Complete wiring of the smoke detectors and relays on each system. Test operation of systems upon completion. 3/8/24: For basement HVAC system: Wired smoke detector normally closed contacts to break low voltage power thereby shutting down system is in duct smoke detector detects smoke. Tested by removing one of the normally closed contact wires: Good