Resol VA20 Montaje página 14

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
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.