Shellab SVAC9-2 - Manual (Page 15)

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CONTROL OVERVIEW (CONTINUED)
V ALVES AND C IRCUIT B REAKERS
Vacuum Valve
This valve is located just below the control panel in a recessed box, and marked VACUUM. It
adjusts the amount vacuum applied to the chamber, when the vacuum is supplied from the KF-25
fitting located in the bottom cabinet. Turning the valve counterclockwise applies vacuum to the main
vacuum line and oven chamber. Clockwise closes off the supply.
Vent Valve
This valve is located to the left of Vacuum Valve. When turned counterclockwise, the valve allows
air to enter the chamber from an inlet in the cabinet, returning it to atmospheric pressure. The vent
must be closed (clockwise) before applying vacuum to the chamber. Failure to do so will likely
result in damage to the vacuum pump. The vent valve is commonly used to purge the oven
chamber with a neutral gas provided by a compressed gas cylinder attached to the vent inlet.
Circuit Breakers
The SVAC9-2 oven comes equipped with two (2) 20 amp circuit breakers. If a breaker trips, turn the
oven’s power switch to off, and locate a cause for the overcurrent before resetting the breaker.