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2. Operation
The actuator is equipped with a manual adjustment device
which can be operated by means of a screw driver. Two
operating modes can be adjusted using this manual adjust-
ment device:
• Manual mode
• Automatic mode
WARNING!
Electric shock!
Disconnect the actuator from the power
supply before changing the setting!
Manual mode:
The actuator opens the valve regardless of the
voltage applied. This position facilitates installa-
tion and enables system operation even when
the controller malfunctions.
Automatic mode:
The actuator controls the valve according to
the voltage applied. This position is mandatory
for normal operation.
14
All manuals and user guides at all-guides.com
3. Stroke indicator
The stroke indicator behind the transparent cover at the
front of the actuator indicates how far the valve is opened.
It is used as a function control of the actuator.
SVA-NC:
When the indicator is in the „open" position after the op-
erating voltage has been applied to the valve for approx. 3
minutes, the unit operates without any fault. When the unit
is disconnected from the power supply, it must return to
the „closed" position within approx. 3 minutes.
The SVA-NO actuator works vice versa.
„Closed" position
The indicator is visibe at the lower edge of the window: the
electrothermal actuator keeps the valve closed.
„Open" position
The indicator fills almost all of the transparent cover: the
electrothermal actuator keeps the valve open.
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