A Control Narrative is a written description of how a building’s control system manages HVAC equipment in response to various operating conditions and setpoints. It translates design intent into plain language that commissioning agents and maintenance staff can understand and verify.
Documentation Format
The narrative describes equipment startup procedures, temperature control logic, occupancy-based adjustments, and emergency shutdown procedures. It includes specific setpoint values (such as 68°F occupied cooling, 75°F unoccupied heating), response times measured in seconds, and conditions that trigger alarms or system lockouts. It explains prioritization between competing demands, such as which zone takes precedence when simultaneous temperature calls exist.
Commissioning and Training
Control narratives enable commissioning agents to verify that actual system operation matches design specifications. They serve as training documents for facility staff, reducing the learning curve for understanding system behavior. The narrative provides a reference point for troubleshooting unexpected operation and guides maintenance decisions. Clear, organized narratives significantly reduce system downtime and operational errors.