It is designed to stay in the circuit continuously while the motor is energized to maintain the correct electrical phase shift

Engineered to meet the exact specifications of the Carrier 30GB and 30GT series

When verifying HVAC motor specifications

maintaining systemic balance and peak cooling performance across the entire evaporator coil surface

This hysteresis synchronous motor driven actuator features a one-handed removal mechanism

Schneider Electric (Barber Colman) MK-6821 Proportional Control Els PW 17895 It is designed to stayThe Schneider Electric (Barber Colman) MK 6821 Proportional Control is a rugged 50 square inch pneumatic valve actuator engineered for precise linear movement in commercial HVAC systems. This spring return actuator operates on a 8 13 PSI pneumatic signal range, providing reliable fail safe positioning during pressure loss. Encased in a durable Nema 1 enclosure, it features a 1 8" NPT air connection and a 1" nominal stroke, making it a standard choice