When you evacuate a system do you open the high side on the manifold along with the low. Or just the low side. I guess there is no harm by opening the high side as well the vacuum pump can draw on both sides of the expansion device and compressor. CAn it damage your high side gauge? The high side gauges don't look like they are made to be put in to a vacuum? Any opinions?
Yes open both. The high side needle may go below zero if it doesn't have a stop pin, but that will not damage the gauge.
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