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A new system should be able to hit 250 microns easily. 250 microns not rising over 500 in a 10-15 minute time period while the pump is isolated or blanked off from the circuit.
Moisture in a tight system will freeze and the vacuum level may get close to 500 microns or below but the ice will sublimate decreasing the vacuum level over the time period the pump is blanked off from the system.
What evacuation target was specified by the manufacturer?
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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