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This product is the present repair accessories It is appropriate for every kind of air calories water warmers on the market PMain purposes and technical indexes This controller is a unique controller for heat pump water heater,There are three temperature sensors(water temperature、External mechanical device temperature、Coil temperature),Three capacity leadership output(compressor、Defrost、Fan),One channel alarm sign input(For immoderate and low pressure protection, etc)。The main applications are as follows: