... and energy saving, offer 5 working modes like Heating,Cooling, DHW, Heating+DHW, Cooling+DHW.2. Use Environment-friendly refrigerant R410A.3 ... maintenanceDATAS & APPLICATION----sanitary hot water, air heating, air coolingINSTALLATION Host unit#Should be installed in a larger & well ... outfall, to facilitate the drainage.#Make sure the unit is vertical after installation, and no incline. CERTIFICATION ...