11
! WARNING
High voltage could cause death or serious injury. Disconnect all power supplies
before opening the electrical enclosure or servicing.
9. Safety Sensors
One high air temperature
(HAT)
switch is standard on the QSVB units. This switch protects the unit by sensing
unusually high temperatures and shutting the unit down.. The switch is located in the discharge line from the vacuum
pump. These sensors are set to trip at approximately 250°F. The probe is non-adjustable.
! WARNING
Never remove, bypass or tamper with this safety HAT switch. Failure to provide
this safety feature could cause death, serious injury and/or property damage. If the
vacuum pump is shutting down due to high discharge temperature, contact a
qualified service technician immediately.
10. Indicators
Main Power on Light
Indicates when power from the main disconnect switch has been turned on and there is live power at the vacuum
pump control panel. This light will remain on as long as there is power to the unit, regardless of the position of the
control selector switch.
! CAUTION
Always check power supply disconnect. The Power-on light may be inoperable.