A Control Diagram is a detailed schematic illustrating all sensors, controllers, actuators, and control logic for automated building systems. These diagrams show how HVAC systems respond to conditions like temperature, humidity, and occupancy. Control diagrams enable technicians to understand system operation, troubleshoot problems, and commission systems correctly.
Diagram Components
Control diagrams depict sensors (temperature, humidity, pressure) with their locations and ranges, controllers (thermostats, damper controllers) with set points and operating modes, and actuators (dampers, valves) with control signals. Wiring connections between components are shown with voltage specifications. Logic sequences describe system behavior, such as heating and cooling staging, ventilation responses, and reset strategies.
System Integration
Diagrams show integration with building automation systems (BAS), including network connections and data points. Alarm and safety interlocks are illustrated to prevent unsafe operation. Manual override provisions are identified.
Operational Reference
Control diagrams serve as operating manuals for building operators, technicians, and future system upgrades. They enable identification of sensor or actuator failures and guide troubleshooting procedures. Proper control diagrams reduce commissioning time by 15-25% and improve long-term system performance.