System Protection: Actively prevents compressor failure by breaking the contactor circuit during low refrigerant events

making it a versatile choice for walk-in freezers

this coil is standard for 110/120V VAC 50/60 Hz applications

This model utilizes an "Open-High" (NCO) configuration

a humming noise from the condenser fan motor

Schneider Electric (Barber Colman) MK-4821 Pneumatic Valve Actuator Refrigerant System Protection: Actively prevents compressorThe Schneider Electric MK 4821 is a professional grade pneumatic valve actuator designed for the precise positioning of 1 1 2" to 2" VB 9XXX series globe valves in commercial HVACR systems. Built for the rigors of mechanical rooms, this actuator features a rugged die cast aluminum housing and an 11 sq. in. effective diaphragm area. It operates on a proportional pneumatic signal with a nominal 8 to 13 psi spring range, ensuring reliable spring return