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CONTROL OVERVIEW
Vacuum Gauge
As set at the factory, this gauge shows the chamber vacuum level relative to sea level
atmospheric pressure in inches of mercury (inHg). The display range is 0 to -29.9inHg. Zero
is the room atmosphere pressure at sea level and -29.9inHg a near-perfect vacuum. See
page 39 for how to display other units of measurement or zero the gauge to your local
altitude.
Vacuum Valve Control
This valve adjusts the level of vacuum draw applied to the oven chamber through
the vacuum port on the back of the oven.
• When open, this valve allows the connected vacuum supply to evacuate the oven
chamber.
• In the closed position, the valve cuts off the vacuum draw.
Vent Valve Control – Backfill Inlet
This valve controls the chamber inlet Vent Port on the back of the oven.
• In the open position, the oven chamber is open to external atmosphere through
the vent intake port on the back of the oven.
• Optional: An inert or clean backfilling gas supply connected to the Vent Port will
flow gas from the pressurized supply to the oven chamber when the Vent Valve is
open.
• When the valve control is in the closed position, the chamber is cut off from
external atmosphere and any gas supply.
o The vent must be closed before applying vacuum to the chamber.
Failure to do so may result in damage to your vacuum pump.
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