What is the purpose of the 30-90 second delay

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Cleveland Controls AFS-275-112 Switch What is the purpose ofThe Cleveland Controls AFS 275 112 is a versatile differential air pressure switch designed for critical HVAC air proving and energy management applications. Built to sense positive, negative, or differential air pressure, this SPDT pressure switch features an adjustable set point range from 0. 05" WC to 2. 0" WC. The plated housing contains a durable silicone diaphragm and a snap acting switch mechanism, ensuring reliable performance in package