Final answer:
A compressor heater is used to prevent refrigerant vaporization, ensuring that refrigerant entering the compressor is in vapor form to avoid compressor damage.
Step-by-step explanation:
A compressor heater is used to prevent refrigerant vaporization. In refrigeration and air conditioning systems, the compressor is a vital component that compresses refrigerant gas, raising its temperature and pressure. This process forces the gas into the condenser coils where heat transfer occurs, and the gas transforms back into a liquid. It's essential that refrigerant entering the compressor is in a vapor state, as liquid refrigerant can damage the compressor. The use of a compressor heater ensures that any refrigerant that has seeped in while the system is off and has condensed into a liquid will be vaporized before the compressor starts, thus preventing potential damage due to liquid slugging.