If you have any other questions, be sure to give us a call. If you have more questions about what a vacuum gauge does and how to read one, continue reading to learn more about it. Here at Fieldpiece, we want to help prepare any HVACR technician for their jobs. This is usually the first step to a service you may provide. This allows you to diagnose issues with the pressure inside the unit. It helps you read the difference between the atmospheric pressure on the outside and inside of the air conditioning unit. The vacuum gauge is a vital instrument for any HVACR technician. Don't rely solely on the sight glass.Want to Pull a Better Vacuum? Start by Learning How to Correctly Use your Vacuum Gauge. Check other system parameters such aspressures, superheat and amperage to confirm whether you have theright charge. In most cases these bubbles will collapse when the blendgets back into the tubing which feeds the valve, and the systemwill operate just fine. This will effectively produce asaturated liquid in the receiver, at the same pressure you hadbefore, which flashes when it hits the expanded volume of the sightglass. Yet when the blend sitsin the receiver, it can 'locally fractionate,' or changecomposition slightly by shifting one of the components into thevapor space of the receiver. Blends will come out of the condenser slightlysubcooled - at a temperature below the saturated temperature of theblend at the existing high side pressure. Ironically, this liquid in the receiver could becausing the problem, particularly when the equipment is in a hotenvironment. Blends could show flashing for the samereason, however, they can also flash when there is plenty of liquidin the receiver. If one of the traditional refrigerantsshowed vapor in the sight glass it often meant there wasn't enoughliquid refrigerant being fed to the valve, and more refrigerant wasadded to the system. There are several reasons forbubbles in the sight glass. In an auto, it is not unusual to have afew bubbles in the sight glass unless you're driving or have a bigfan forcing ais across the condensor. It couldmean you are low on refrigerant, or the high side temp is too high(blocked condensor maybe). On the highpressure side, bubbles simply mean not all the high-pressurerefrigerant has condensed. Good luck!Actually, the bubbles could be completely normal. This ismost likely at the suction of a pump or compressor. Other systems would be were you are drawing a vacuum. If it isyour air conditioner, then you most likely have a cooling coilleak. Bubbles normally means air intrusion into a system.
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