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Check for high static pressure
this is the official replacement for the older 135980 part number and is standard for the 200-400 range of UD and UB series heaters
Specifically designed for Permanent Split Capacitor (PSC) and Shaded Pole motors
a specific LAC model with a different pressure rating or an adjustable ORD/ORI combination would be required
Johnson Controls P74FA-1 Pressure Control Refrigerant Check for high static pressureThe Johnson Controls P74FA 1 is a professional grade differential pressure control designed for precise monitoring of pressure variations between two sensing points. This heavy duty SPDT snap acting switch is a standard for contractors managing chillers, water cooled condensers, and heating coils where proof of flow is critical for system protection. Engineered with durable brass bellows, the unit handles non corrosive refrigerants, air, and liquids