Air or moisture can be trapped in one side of the system and will eventually let go and therefore a higher reading on the micron gauge will occur. Sometimes moisture can be trapped in the oil of the compressor and when it escapes it will show up in the gauge.

How do you adjust a micron gauge?

5:039:35Fieldpiece SVG3 Micron Gauge - YouTubeYouTubeStart of suggested clipEnd of suggested clipPull thats that okay and then hook up your hose. Directly to the court a little. Tool. ThatsMorePull thats that okay and then hook up your hose. Directly to the court a little. Tool. Thats straight through and then where the vacuum gauge goes is right to this port on the side.

How do I know if my micron gauge is leaking?

If the system is leak and contaminant free you may see a slight rise on the micron gauge which will level off and flatten out or you may see no rise at all. If a system leak exists or contaminants are still present, you will see a quick rise on the micron gauge that will continue to climb.

What does a micron gauge do?

A micron gauge is the only device that accurately reads the vacuum pressure needed for deep vacuum. system, generates heat.

How many microns do I need for a good vacuum?

Why a Vacuum Pump? ASHRAE recommends evacuation to below 1000 microns for moisture removal and below 500 microns after replacing a compressor. Some equipment manufacturers call for evacuation to 400 microns to ensure that harmful water vapor is removed from the system.

How long should it take to get to 500 microns?

It took 11 minutes and 46 seconds to hit the 500-micron mark, as removing water is work and takes time. After hitting 500 microns, at isolation, the tank pressure very quickly rises (decay). This shows hitting 500 did not do the job of dehydration. Even hitting 500 microns effectively at the far end of the system!

What is a standing vacuum test?

A standing pressure test is used to check for leaks by us- ing a dry gas, such as dry nitrogen. Technicians never hope to find leaks while in a vacuum, but it happens. When air leaks in, moisture comes along for the ride, which can take hours to remove if the amount is exces- sive.

Whats a good micron reading?

The following are guidelines for an acceptable standing level of vacuum. For systems containing mineral oil like R22 systems, a finishing vacuum of 500 microns with a decay holding below 1000 microns generally considered acceptable, whether we are talking a new installation or a system opened for service.