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PENN Controls Products Catalog

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P74 Series Differential Pressure Control Description Series P74 measures the pressure difference between two sources: supply lines and return lines. A change in differential pressure will reposition the switching mechanism to cause corrective action of the supplementary control equipment. Refer to the P47 Series Steam Pressure Controls Product Bulletin (LIT-125450) for important product application information. Features • field-proven Penn switch with a completely enclosed contact mechanism • pressure differential setting is easily changed without removing the cover Applications • differential pressure sensing on chillers or water- cooled condensers • lube oil failure cutout for refrigeration compressors (same as the P28, but does not incorporate time delay) • positioning M100 Series motor-actuated valves (P74JA-2) • to prove pump operation Accessories All models include a universal mounting bracket. 171

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