Chamberlain DH Wiring Diagram

APPLICATION REQUIREMENTS
This wiring modifi cation 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 modifi cation 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).
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 fi nal reduction chain and rotate Lock Sensor
until switch is in activation mode.
4. Tighten mounting screws (2) to secure Lock Sensor position.
5. Repeat fi ne adjustments.
Chain Idler Sprocket
FIGURE 1
must engage top side
of reduction chain
Final Reduction
Chain
LOCK SENSOR (D1 WIRING)
WIRING DIAGRAM & INSTRUCTIONS
ADJUSTMENT
To avoid SERIOUS PERSONAL INJURY or DEATH from
electrocution, disconnect electric power to operator BEFORE
adjusting Lock Sensor.
Mounting
Screws
Model: DH, DJ and DH/J
Lock Sensor
Assembly
Lock Sensor Switch
(held to normally closed)
To adjust opening force
tighten or loosen wing
nut accordingly