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The primary function of a low pressure cut off switch is to establish a minimum operating pressure in the evaporator. This switch is designed to prevent the compressor from running when the refrigerant pressure drops below a set threshold, which could indicate a potential problem, such as a leak or low refrigerant levels. By ensuring that the evaporator maintains a minimum pressure, it protects the system from damage that could arise from low refrigerant conditions, such as ice formation on the evaporator coils or compressor failure due to running without adequate refrigerant. This highlights the importance of maintaining proper pressure levels for efficient and safe operation of refrigeration and air conditioning systems.