... 6 running mode as below, meet more requirements of clients.1, Cooling,2, heating, 3, hot water only,4, cooling+hot ... )Refrigerant:R407C, R410a, R290, R134a, R22Characters:Anti-freeze thermos Water Source Heat Pump use underground water or circulated water or brine ... Sight glass which must be installed in factory,Source side water flow switch,Source side water pump,Anti-vibration rubber,Metallic filter ...