Why is it crucial to use only approved refrigerants?

Using approved refrigerants is crucial primarily because it ensures compliance with environmental laws. Many refrigerants are regulated due to their potential impact on the ozone layer and contribution to climate change as greenhouse gases. The use of unapproved refrigerants can lead to legal penalties and environmental harm, complicating both the operation of refrigeration systems and public health concerns. Adhering to approved refrigerants also ensures that technicians are working with substances that are recognized for their safety and efficiency in the systems they operate.

On the contrary, minimizing costs, maximizing system size, or increasing the amount of refrigerant used does not address the legal and environmental considerations that are vital for responsible engineering practices. Therefore, the focus on using approved refrigerants primarily pertains to adhering to regulations that protect the environment and public health.