Grifco Fire Shutter - Descent Speed Adjustment; Testing; Operation

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Fire Shuer 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 xed point. The linkage must be arranged so that the force
provided to engage the release arm is in a direcon close to parallel to the axis of the output sha.
RELEASE ARM SPRING TENSION
When the release arm is in the engaged posion, the spring should be stretched to be at least 250mm in length.
ADJUSTING THE CONTROLLED DESCENT SPEED
The speed at which the shuer falls during controlled descent can be adjusted by moving the governor yweights. If the
yweights are at their outermost points on their shas, 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 yweights, loosen their grub screws with an allen key and slide
them into the desired posion on their shas. Tighten the grub screws with the allen key.
SETUP AND ADJUSTMENT
To test the system, engage the release arm and li the shuer 500mm with the hand chain. Then disengage the release arm.
The shuer should fall steadily to the ground.
TESTING
OPERATION
If the operator is ed to the shuer and has a spring assisted fusible link causing the release arm to engage or be waing to
engage, it is ready for operaon. The shuer may now be operated manually or electrically.
If the fusible link breaks due to re or re alarm signal, the shuer will undergo controlled descent to the ground. The release
arm is now disengaged.
To operate the shuer aer controlled descent, the release arm must be re-engaged with a new fusible link.