Large heating commercial air source heat pumps,Green R410A, Easy installation,with or without buffer water tank for option Commercial Air Source heat pumps Features:1. Base ... overheating,overload,antifreezing,phase order,discharge temp,etc. 7. Air exchanger(Fins-coil)with hydrophilic coating,Automatic defrosting function ... unit before package in the factory.Specifications: 38kw Air Source Heat Pumps