Johnson Controls T 4756 202 Thermostat Els PW 17895 Common Service Questions What causes Common Service Questions What causes a low pressure switch to trip frequently The KMC Controls MCP 3631 2000 Actuator is a professional grade pneumatic rotary actuator designed specifically for VAV terminal unit control and small damper applications in commercial HVAC systems These are primarily used in zones where rapid response is required or where the thermostat must control a large number of pneumatic actuators simultaneously High Volume Output: Reduces lag time by providing sufficient airflow to drive multiple actuators without the need for additional relays