Sheldon SHEL LAB SVAC1, Installation And Operation Manual, Page: 68 / 78

68 | P a g e
MAINTENANCE
Vacuum Diagnostic Questions
P
ump On
U
and
U
Running?
Yes or no?
V
ent Valve Closed?
The vent (backfill inlet port) must be closed before pumping down the chamber. Failure to do so may
result in damage to your vacuum pump.
V
acuum Valve Open?
The vacuum valve must be open to allow a connected vacuum supply to evacuate the oven
chamber.
D
isplay Reading?
Record the chamber pressure level showing on the Vacuum Gauge display.
Reminder : Make sure to record the correct unit of measurement for the chamber pressure. See
the
33T
Vacuum Gauge Operations
33T
topic on page 48 to verify the current unit of measurement.
Vacuum Valve
AND
Vent Valve