Refrigeration Maintenance 10-12
Constant Pressure Rise After Evacuation Indicates
System Leak
1. Close the vacuum valve and watch the movement of vacuum
gauge needle. If needle continues to rise, this is an indication
that a leak exists in the unit or connecting line. The leak must
then be located and eliminated.
2. Time
3. Pressure (Vacuum)
4. Atmospheric Pressure
Pressure Rise Levels Off After Evacuation Indicates
Moisture in System
1. Close the vacuum valve and watch the movement of vacuum
gauge needle. If needle shows a pressure rise but finally
levels off to a constant pressure, the system still contains too
much moisture. Dehydration and additional evacuation time
are required.
2. Time
3. Pressure (Vacuum)
4. Atmospheric Pressure
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