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Automatic switchover is initiated by low pressure (high vacuum) of the on-line source and resulting switch closure.
The mechanical limit switch in each motorized ball valve actuator is adjusted to transfer when the valve reaches the
closed position. When the controller senses a limit switch closure, it opens the motorized ball valve on the stand-by
source. The automatic switchover design uses the mechanical limit switches to prevent either motorized ball valve
from opening before the other motorized ball valve is completely closed.
Manual override is accomplished by selecting the manual mode using the Auto/Manual selector switch, then
manually opening or closing the desired valve using the Side A or Side B, Open/Closed selector switches.
Figure 1 - Series 1041B Automatic Switchover Unit Faceplate
Reset
Close
Close
Open
Manual
Open
Auto
W
G
A
R
A
G
R
W
On
Off
