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The SZ2165 is a microprocessor based boiler controller. It is designed for use on multi-stage boiler applications and includes chiller support and control. • Stand-alone or network operation • Stand-alone or network operation • 365-day time clock with two holiday schedules, automatic leap year and daylight savings correction • No backup battery required for control parameters, schedule or clock • Hot water supply and return temperature inputs • Chilled water supply and return temperature input • Two digital outputs for chillers • One digital output for alarm • Mixed water temperature input • Outdoor air temperature input • Outdoor air reset control • Two digital inputs for pump status • External time clock input • Local override and remote override capability • Six digital outputs for boilers, pumps and boiler stages • Adjustable offsets and differentials on digital outputs • Lead/Lag sequencing of up to four boilers • Analog input for pressure control • Two modulating analog outputs for valves and VFDs • Adjustable P+I+D control on modulating outputs • LEDs for monitoring status • Automatic rotation of pumps • Automatic rotation of boiler and chiller stages • Domestic hot water function |