Pressing it down uncouples the operat-
ing shaft from the reduction gear, which
allows it to be turned.
To open the valve (anti-clockwise
rotation), turn the operating shaft a
quarter turn anti-clockwise, until the
position marking on the square head
is in the 90° position (or 0° for
transverse installation) or at the re-
quired angle setting.
To close the valve (clockwise rota-
tion), turn the operating shaft a
quarter turn clockwise, until the po-
sition marking on the square head is
in the 0° position (or 90° for
transverse installation) or at the re-
quired angle setting
To operate the unit in automatic mode
again, the operating shaft must be
released (no longer pressed down).
Built-in springs return the operating
shaft to the engaged position, at the
latest when the engine is started.
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