What is the appropriate pressure for an automotive refrigerant pressure gauge?
1 Answers
Depending on the ambient temperature, the normal working pressure of the refrigeration system is generally 3^6 bar for the low pressure and 10^25 bar for the high pressure. Below is relevant information about the refrigerant pressure gauge for air conditioning: 1. Why add Freon to the air conditioning system: Freon is the medium that transfers heat in the air conditioning refrigeration system. Without it, heat cannot be effectively exchanged, and the air conditioner cannot cool or heat. Therefore, once the air conditioner lacks Freon, external symptoms include poor cooling (heating) performance, failure to cool (heat), protective shutdown, water leakage from the indoor unit (sometimes spraying water), and ice formation on the indoor evaporator. There are also unseen issues—reduced lifespan of the air conditioner, wasted electricity, and damage to the air conditioner compressor. Thus, to use the air conditioner normally, there must be sufficient Freon. 2. How much Freon is appropriate to add: In high-temperature summer weather (when the ambient temperature is above 32°C), the pressure gauge needle should stabilize at 0.45 MPa. In spring and autumn, it should be 0.3 MPa. In winter, adding Freon does not strictly follow the pressure gauge reading (the reference pressure is 1.8 MPa) but relies on the technician's experience or observing the needle's swing amplitude.
