27
26
Gas Ballast Valve Switch
Much of the air and moisture in a system are
removed before reaching 3000 microns For wet
systems, you should open the gas ballast during
this initial pull down Doing so helps the pump
run smoothly and keeps the oil in good condition
for when you need it most -- towards the end of
the evacuation
At about 3000 microns, when the sound of the
pump quiets down, the gas ballast should be
closed so that a deep vacuum can be generated
Open
• Set here for initial pumping down
(above 3000 microns) of wet
systems.
• Yellow window LED shines.
• Discharge stroke exposed to
ambient.
Closed
• Normal operating position.
• Yellow window LED off.
• Discharge stroke isolated from
ambient.
LED Indicators
Three columns of LEDs in the oil window
indicate various states The blue lights of the
right column indicate power is connected The
blue lights of the middle column shine when the
pump is switched on The LEDs of the left column
typically indicate the gas ballast valve is open
Special Messages
Yellow Blink (Solid yellow LED on VP67):
Gas ballast valve open.
Yellow Blink + Red Blink (VPX7/VP87):
Low voltage detected.
Red Blink (VPX7/VP87):
High voltage detected.
Red Solid (VPX7/VP87):
Internal fault detected.
SPECIAL
MESSAGE
(Y/R)
SWITCHED
ON
(2 BLUE)
PLUGGED
IN
(2 BLUE)
