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This hydraulic action temperature control is applicable for all types of commercial or industrial refrigeration applications. This control will close contacts on rise in temperature and open them on a fall in temperature. This control has a two-circuit contact structure which will simultaneously close two circuits on a rise of temperature and open them on a fall of temperature. This two-circuit control is intended for use on zoning systems where all controls operate a common compressor but operate a separate solenoid refrigerant valve in each zone. Features: Hydraulic action element. Dustproof steel case with top and bottom knockouts. Temperature dial graduated in F and C and can be adjusted through cover. High electrical ratings allow operation of most equipment without use of relays or motor starters. Model 1609-90 – For use in zoning systems where all thermostats control a common compressor a separate solenoid refrigerant valve in each zone.