LiftMaster SD GSD Manual - Page 7

NOTE: For bi-parting doors, it is necessary to bring the doors to a fully closed position for proper synchronization. With both disconnect pins and engaged in their respective carriages, lift the drive chain over the three studs on the bi-part carriage and secure the chain to the slider with the hardware provided (see figure 5). 7. Adjust the screw collars on the disconnect pin so that it enters into the trolley bracket about 3/4". 8. Mount the chain retaining bracket (with keyhole slot) at a convenient height on the door, directly below and aligned with disconnect chain. Mount it so that keyhole is in the horizontal plane (repeat for bipart door). FUSIBLE LINK INSTALLATION (OPTIONAL) 1. Mount chain retaining bracket to door, approximately 4 ft. above the floor and 2 inches off centerline of door as shown in figure 1. 2. Attach eye bolt to lower slot on disconnect assembly (see figure 1). 3. Secure fusible link mounting bracket to upper leading edge of door (6 to 12 inches below top of door) so that the fusible link will be in door opening when door is open (see figure 1). 4. Thread the fusible link chain through the eye bolt as shown, then through the eyelet in the weight mechanism, and then up through the bottom of the disconnect pin. 5. Raise the weight to approximately 3 feet from floor level and engage the chain in the slot of the chain retaining bracket. 6. Couple the chain to itself around the weight so that the chain cannot move through the eyelet in the weight. 7. Disengage the chain and allow the weight to hang from the fusible link. 8. Leave a small amount of slack between the weight and the disconnect pin and fasten a split key ring to the link on each side of the disconnect pin so that the chain cannot pass through the hole. 9. Cut off excess chain, leaving 6" to hang below chain retaining bracket. 10. Fasten large split key ring to end of chain. 11. Mount the weight guide to the door as shown, with weight protruding above guide 3 to 4 inches. 12. For bi-part doors install the second fusible link assembly on the other door in the same manner. Be sure that one is lower than the other so as not to interfere with each other when the doors are fully closed. 13. IMPORTANT: TEST THE FUSIBLE LINK DISCONNECT INSTALLATION AS FOLLOWS: Manually remove the fusible link from the bracket and allow the weight to pull down on the disconnect pin. Verify that the door is disconnected and moves freely. If necessary, adjust spring on disconnect assembly by moving top shaft collar up or down. ELECTRICAL CONNECTIONS & OPERATING INSTRUCTIONS POWER AND CONTROL WIRING: Refer to the Owners Manual supplied with your operator for all power and control wiring. ELECTRICAL OPERATION: The door can be operated by means of the three button control station or by other controls, when provided. Refer to Control Connection Diagram located on the back cover of the Owners Manual for all control options. MANUAL OPERATION: The door cannot be moved manually with the slider carriage connected. However, a quick disconnect pin and chain mechanism is provided to uncouple the door from the slider carriage. To disengage the door, simply pull the chain down and engage it in the keyhole slot an the bracket provided for this purpose. With the mechanism disconnected, the door can be manually opened or closed. 7