Pressure Operators
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These 3511 and 3520 Series pressure operated damper controls are for compressor head pressure control of air-cooled air conditioning/refrigeration equipment under low ambient temperature conditions. When lowering outside air temperatures begin to reduce head pressure, the pressure operator modulates the damper louvers, reducing the flow across the condenser. The reduced air flow maintains head pressure at the correct point for the most efficient operation, and keeps running time to a minimum during all low ambient conditions. The 3511/3520’s connect to the high pressure side of the system between the condenser and the receiver with 1/4" O.D. tubing. These pressure operators are compatible with new refrigerants.
