Crankcase Heater : Electric heating element that is used to heat the compressor crankcase to prevent migrating refrigerant from condensing and diluting the crankcase oil during the off-cycle
EESiFlo North America, Terminology and Glossary: HVAC Terms, Pennsylvania, USA 2002. flowmeterdirectory.com/flowmeter_terminology, (Heat, Vent and Air Cond - Amer) {553}