... installation,with or without buffer water tank for option Commercial Air Source heat pumps Features:1. Base frame and extenal panels made ... pressure,overheating,overload,antifreezing,phase order,discharge temp,etc. 7. Air exchanger(Fins-coil)with hydrophilic coating,Automatic defrosting function included, Themostatic ... every unit before package in the factory.Specifications: 38kw Air Source Heat Pumps