The pressure gauges keep track of temperature and pressure variations in conjunction with an AC device. Micron gauges can demonstrate wild fluctuations in pressure levels if there is a system fault. In the event of an issue then it might be related to the reasons on the YouTube clip “HVAC Vacuum Problems: 5 Strategies for micron gauge readings that are jumping Around!”
Wild changes in micron pressure gauge readings may occur due to water in the system. When water enters the system and is near the vacuum pump outlet, it may be pulled out through the vacuum pump, which can cause a sudden decrease in the pressure reading. These fluctuations can result from the accumulation of oil within the evaporator coil. Oil blocks space within the coil by moving between sides, which leads to changes in the gauge’s micron size. Technicians should conduct an oil blowout procedure to fix the issue.
The dirty sensor of a vacuum gauge that is coated and oil could also lead to rapid pressure changes. Cleaning the gauge sensor with alcohol can solve the issue. Pressure gauge issues with microns can cause frequent leaks from the surface valves or hoses.