Generally speaking, in the refrigeration mode, the external machine is the condenser of the refrigeration system and the internal machine is the evaporator of the refrigeration system.

In the heating mode, the internal machine becomes a condenser and the external machine becomes an evaporator through the four-way valve conversion. Coupled with electric heating to assist heating, it also plays the role of blowing hot air.

1, Freon is the medium for transferring heat in air conditioning and refrigeration system. Without it, heat cannot be exchanged effectively. It is also impossible for air conditioners to cool or heat. So once the air conditioner is short of fluorine, the internal evaporator freezes and so on.

There are even more problems that can't be seen on the surface-reducing the service life of air conditioners, wasting electricity, poor cooling (heat) effect, no cooling (heat), protective shutdown, water leakage from indoor units (sometimes spraying water), and damage to air conditioner compressors. So if you want to use the air conditioner normally, you must have enough freon.

2. The operation of air conditioning heating mode is completed by two parts, one is "heat pump heating" and the other is "auxiliary electric heating heating"; If the air conditioner is equipped with an auxiliary electric heater, the air conditioner has no "fluorine" and can also be heated by the auxiliary electric heater; If the air conditioner does not have an auxiliary electric heater, it definitely needs "fluorine" to heat it.

Freon, also known as Freon, its name comes from English Freon, and it is a registered refrigerant trademark of DuPont Company in the United States. There are differences in the definition of freon in China, which is generally defined as the general name of halogenated compounds of saturated hydrocarbons (mainly methane, ethane and propane). According to this definition, freon can be divided into four categories: CFC, HCFC and HFC. Some scholars define freon as CFC refrigerant; ? [1] in some data, freon only refers to dichlorodifluoromethane (CCl? f？ R 12, a CFC).

Freon is colorless gas or volatile liquid at room temperature, tasteless or slightly smelly, non-toxic or low-toxic, and its chemical properties are stable.

The use of chlorofluorocarbon refrigerants, such as dichlorodifluoromethane, has been restricted because they will destroy the atmospheric ozone layer. There have been many holes in the ozone layer on the earth, some of which have exceeded the area of Africa, which is largely due to the chemical properties of chlorofluorocarbons. Another harm of freon is the greenhouse effect.