1, Air Cooled Heat Pump 2, Twin-screw compressor 3, SIEMENS PLC control 4 ... water and cold water 5, CE, SGS, this is Air cooled heat pump with two compressors, and has following aspects.1. ... . Ambient temperature is 35 degrees Heating conditions: outside the air-dry-bulb temperature is 7 degrees, wet bulb temperature is ... R134A refrigerant.11. Free step-down triangle stars starter Air Source Heat Pump