Grifco Fire Shutter, Инструкция по эксплуатации

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Fire Shutter Mechanism
RELEASE ARM FUSIBLE LINKAGE TYPES
There are three basic forms of fusible linkages, heat, voltage, and heat and voltage. These systems may be connected in
series with a cable.
FUSIBLE LINKAGE CONNECTION
The fusible linkage should be connected in series with a spring so that it engages the release arm. The end of the linkage not
connected to the release arm should be fastened to a secure fixed point. The linkage must be arranged so that the force
provided to engage the release arm is in a direction close to parallel to the axis of the output shaft.
RELEASE ARM SPRING TENSION
When the release arm is in the engaged position, the spring should be stretched to be at least 250mm in length.
ADJUSTING THE CONTROLLED DESCENT SPEED
The speed at which the shutter falls during controlled descent can be adjusted by moving the governor flyweights. If the
flyweights are at their outermost points on their shafts, descent speed will be at its lowest. If they are on their innermost
points the descent speed will be at its highest. To move the flyweights, loosen their grub screws with an allen key and slide
them into the desired position on their shafts. Tighten the grub screws with the allen key.
SETUP AND ADJUSTMENT
To test the system, engage the release arm and lift the shutter 500mm with the hand chain. Then disengage the release arm.
The shutter should fall steadily to the ground.
TESTING
OPERATION
If the operator is fitted to the shutter and has a spring assisted fusible link causing the release arm to engage or be waiting to
engage, it is ready for operation. The shutter may now be operated manually or electrically.
If the fusible link breaks due to fire or fire alarm signal, the shutter will undergo controlled descent to the ground. The release
arm is now disengaged.
To operate the shutter after controlled descent, the release arm must be re-engaged with a new fusible link.