Heat Pump Water Loop Controller


The SZ2161 is a microprocessor-based controller
designed for water source heat pump plant control


• 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 input • 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 • damper • spray pump • 2 loop pumps • 2 boiler pumps • 2 fan speed selections • 4 boiler stages • Adjustable offsets and differentials on relay outputs • Two modulating analog output for speed drive or boiler • Mixing valve control • LEDs for monitoring status • Automatic rotation of pumps • Automatic rotation of boiler stages

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