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Fire Shutter Mechanism
RELEASE ARM DISENGAGED POSITION
When the release arm has no fusible linkage connected, the spring inside the mechanism will force the arm into its
disengaged position. In this position the output shaft is disengaged from the drive sprocket and engaged with the flyweight
shaft. This is the position of the arm for controlled descent of the shutter without electrical power.
RELEASE ARM "WAITING TO ENGAGE"
The release arm may only be fully engaged on half of the output shaft rotation. For the other half of its rotation the arm will
be held out at a slight angle to the plate. This will be called "waiting to engage". When the release arm is waiting to engage,
operating it manually or electrically will cause it to automatically engage.
RELEASE ARM ENGAGED POSITION
In this position the output shaft is engaged with the sprocket and disengaged from the flyweight shaft. This is the position for
normal electrical or manual operation of the shutter. To engage the arm, a spring assisted fusible linkage is used. In the
engaged position the release arm is parallel to the mounting plate.
SETUP AND ADJUSTMENT
Summary of Contents for Fire Shutter
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