Refrigeration Controller


The SZ2141 is a microprocessor-based refrigeration
controller and alarm interface is designed to control
three coolers or freezers and monitor up to six


• Stand-alone or network operation • Independently programmable high and low limits for each input • Independently programmable manual or automatic alarm reset • Change of state factor with programmable hysteresis • Status LEDs • Relay output to activate additional auxiliary communication devices or external alarm circuit • Six RTD temperature inputs • Five analog inputs suitable for a broad variety of transducers • Programmable defrost cycles with time or temp termination • Temperature or pressure monitoring inputs • Monitor compressor and door status

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Specs & Docs


General Accuracy: +/- 0.5% Programming: EIA RS485 interface Communications: RS485, half duplex Memory backup: Non-volatile EEPROM, no battery requiredEnvironmental Operating temperature: 32 to 131°F (0 to 55°C) Operating humidity: 0 to 100% RH, non-condensing Storage temperature: 14 to 140°F (-10 to 60°C)Electrical Supply voltage: 24 VAC +/- 20% Inputs: Six platinum RTDs, range: -40 to 160°F five 4-20 mA analog and six digital (dry contact) Outputs: Nine digital (SPST dry contact, 24 VAC @ 1 A) configurable Analog input impedance: 250 Ω Power Consumption: 15 VA max.Specifications subject to change without notice