... 4.0 *Reliable system,powerful control *CE Residential Air-source Heat Pump System1. Heating, cooling and DHW function, adaptable ... , Emerson ALCO expansion valve, Siemens electric, etc., high quality and reliability5. Intelligent microprocessor control with heating curve inside ... such as anti-frost protection, high/ low pressure protection, water flow protection, high-temp protection, etc., and ...