HVAC heat exchanger freeze control means

摘要

A method and HVAC system having a heat exchanger and a device for adjusting parameters of an HVAC system via an algorithm, in an incremental or linear fashion, is provided. Various aspects provide a method for altering and/or controlling auxiliary evaporator temperature in an automotive HVAC unit and an HVAC system having an HVAC unit with a blower and a temperature sensing device capable of detecting temperatures that drop below a desired minimum operating temperature and sending a corresponding signal, ultimately preventing evaporator freezing.