Digital manifolds may have a built-in, accurate vacuum gauge for convenience but leaky hoses/connections and distance from the system affect readings. Slow micron rise indicates moisture still burning off while a faster micron rise indicates a system leak. This article should help you better understand the readings on your vacuum gauges and what fluctuations can mean.Ī vacuum gauge is the best tool to measure deep vacuum and “see” what’s going on with the system. We’re measuring differences that are so tiny, that even bumping a gauge or jostling a fitting can cause them to fluctuate. Since a micron is so small, fluctuations in the readings on vacuum gauges are common. While 500 microns is a popular rule of thumb, each system manufacturer has their recommended pressure for a vacuum and you should definitely check the manual before pulling one. To make sure the system is ready for refrigerant, you need to make sure the vacuum you pull is deep enough to remove all moisture and non-condensable gasses. While at 500 microns, water boils at -12 degrees F. At 1,000 microns, water boils at 1 degree F. Even though microns are small, there’s a massive difference between 500 microns and 1,000 microns. It takes a deep vacuum of 500 microns or lower to boil off and remove all moisture and non-condensable gasses from a system. Removing all of these can directly increase the expected life and efficiency of the system. Moisture in the system can turn to acid and freeze, and other non-condensables like nitrogen, air, water or other refrigerants can change the pressure readings in the system. If you’re installing a new HVACR system or making repairs, it’s important to remove all moisture and non-condensable gasses before adding any refrigerant. 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. Want to Pull a Better Vacuum? Start by Learning How to Correctly Use your Vacuum Gauge.
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