HVAC Controls Fundamentals: 4–20 mA, 3–15 PSI, BAS, Control Loops & PID Basics
HVAC Controls Fundamentals Understanding HVAC controls fundamentals is what helps everything else in the system make sense. Refrigeration creates the heat transfer, airflow moves the air, and electrical components provide power, but controls are what tell the system when, how much, and how often to respond. Let’s start with a free practice test to see…