Crankcase heaters and electric heaters in piping for refrigeration systems. The crankcase heaters provide to HVAC compressors a temperature-controlled microenvironment thanks to the heat generating circuit. Therefore, even when the compressors ...are no longer operating or when the negative temperatures are very low, the cooling system is provided with the positive temperature necessary to prevent the migration of refrigerant in the refrigeration circuit due to the cooling of the components. In choosing the necessary crankcase heater, it is essential to consider the circumference of the compressor served (the length of the resistor) and the capacity applicable to the crankcase heater. Regarding the electric heater for evaporators (vaporizer defrost resistors), they are intended to protect the internal elements of the evaporators against their freezing, even if negative temperatures are ensured in the cold room. Electric resistors for blowers are mainly used in the case of rooms with negative temperatures. In order to select the correct electrical heaters for the evaporators, there is the option of single heaters in piping, double type electric heaters and U-shaped electrical heaters. Mai mult
