Samson 3274 Mounting And Operating Instructions page 50

Operation
The control signal is disconnected from the
actuator and the valve can be moved to the
desired position by using the two IN and
OUT pushbuttons. The valve remains in this
position.
If the controller signal is to have priority
again, proceed as follow:
1. Switch off the supply voltage and remove
the cover.
2. Firmly press down the release button un-
til it engages (the red marking pin reap-
pears).
3. Refasten the side housing cover and re-
connect the supply voltage.
Mechanical override
1. Press the black release button at the front
of the housing.
2. Insert a hex wrench (width across flats
24) into the shaft end protruding from
the housing to move the rack-and-pinion
gear until the require actuator stem posi-
tion has been reached.
As soon as the button is released, the actua-
tor reacts again according to the controller
signal.
If the valve is to remain in the manually de-
fined position, disconnect the isolating termi-
nal 81.
8-2 EB 8340 EN