LiftMaster DH DJ Locksensor Mechanical Manual - Page 1

APPLICATION REQUIREMENTS This wiring modification is available to models DJ and DH/J Standard-Duty operators with 24Vac control circuits and "D1" type wiring. NOTE: If C2 or B2 wiring is desired refer to conversion instructions on pages 2 and 3. FUNCTIONS This modification stops the operator when extra tension is sensed on the door from the mechanical door lock, obstruction or extensive binding. OPERATION When the operator senses extra tension when closing, the Lock Sensor will stop the operator. Press close button and run until the operator shuts off (to unlock door when load removed). LOCK SENSOR (D1 WIRING) WIRING DIAGRAM & INSTRUCTIONS Model: DH, DJ and DH/J ADJUSTMENT FINE ADJUSTMENT • To increase opening force, tighten wing nut. • To decrease opening force, loosen wing nut. COURSE ADJUSTMENT (if required) 1. Release spring pressure on pivot arm. 2. Loosen but do not remove mounting screws (2). 3. Fully tension final reduction chain and rotate Lock Sensor until switch is in activation mode. 4. Tighten mounting screws (2) to secure Lock Sensor position. 5. Repeat fine adjustments. To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution, disconnect electric power to operator BEFORE adjusting Lock Sensor. FIGURE 1 Chain Idler Sprocket must engage top side of reduction chain Final Reduction Chain Mounting Screws Lock Sensor Assembly Lock Sensor Switch (held to normally closed) To adjust opening force tighten or loosen wing nut accordingly