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Freeze Protection The basic design for a Sanden system requires piping potable water to the heat pump. Eco Cute systems are designed to be able to lift water temperatures over 100°F quickly and efficiently, having a heat exchanger in the storage tank and a closed loop type system will significantly reduce performance and efficiency. This results in water being potentially exposed to freezing outdoor temperatures, so strategies are set up both in installation and the unit control system to minimize the potential of a freeze-up. 1. Minimal Water Piping Outdoors – Plan your job site and unit location to penetrate into the building adjacent to the heat pump Use 3⁄4” minimum thick closed cell insulation on the external piping Tape joints and ensure that none of the system piping is exposed 2. Control Logic – Two stages of freeze protection built into the control logic. Stage 1; Unit measures Inlet water temperature or outlet water temperature below 39°F (4°C), with an outside air temperature less than 30°F (-1°C) Stage 2; If the outside air temperature is at or below the temperatures in the table below, freeze protection will be triggered based on timing, not inlet & outlet water temperatures. Timing starts once the compressor has cycled off in normal operation, unless power is lost to the unit, in which case the timing will restart at zero when power is restored. When the freeze protection cycle starts initially the water pump will operate, then the compressor will start 3 minutes later. Water will be heated to the set-point temperature and the compressor will continue to operate until the return water to the heat exchanger reaches 122°F. Once the compressor stops the timing will begin again and based on the ambient temperature freeze protection will begin again after the appropriate time period has passed. 17PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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