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heat pump water loop controller The SZ2161 is a microprocessor-based controller designed for water source heat pump plant control applications. • 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 • Supply and return condenser water temperature inputs • Supply and return loop water temperature inputs • Outdoor air temperature inputs • Boiler supply water temperature input • Four digital inputs for status • External time clock input • Local override and remote override capability • 12 digital outputs for control of • 2 fan speed selections • Adjustable offsets and differentials on relay outputs • Two modulating analog outputs for speed drive or boiler • LEDs for monitoring status • Automatic rotation of pumps • Automatic rotation of boiler stages |