Chamberlain DH Installation and operating instructions

APPLICATION REQUIREMENTS
This modification is available to models H and J Logic operators.
FUNCTIONS
This modification stops the operator from running when extra
tension is sensed on the door from the mechanical door lock,
obstruction, or extensive binding.
OPERATION
When the lock sensor senses an excessive load while running the
open cycle from the close limit, the lock sensor will stop the
operator. Press the close button and run the operator until it
shuts off (to unlock the door when the load is removed).
NOTE: Refer to lock sensor addendum for adjustment. For all
other installation instructions refer to owner’s manual provided
with operator.
ADDENDUM
LOCK SENSOR
Models DH, DJ, and DHJ
FINE ADJUSTMENT
• To increase opening force, tighten the wing nut.
• To decrease opening force, loosen the wing nut.
COURSE ADJUSTMENT (IF REQUIRED)
1. Release spring pressure on pivot arm.
2. Loosen but do not remove two mounting screws.
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.
Final Reduction Chain Chain Idler Sprocket
must engage top side
of reduction chain. Lock Sensor Switch
(held to normally closed).
To adjust opening force
tighten or loosen adjustment
on wing nut accordingly.
Mounting Screws
Lock Sensor Assembly
LOCK SENSOR ADJUSTMENT
Moving parts may cause SERIOUS INJURY. Keep hands
CLEAR of sprockets, chains, and other moving parts when
making adjustments.
ATTENTION
AVERTISSEMENT AVERTISSEMENT
AVERTISSEMENT
WARNINGWARNING
CAUTION
WARNING
WARNING
PRECAUCIÓN ADVERTENCIA
ADVERTENCIAADVERTENCIA
© 2010, The Chamberlain Group, Inc.
01-31376C All Rights Reserved
Final Reduction Chain Chain Idler Sprocket
must engage top side
of reduction chain. Lock Sensor Switch
(held to normally closed).
To adjust opening force tighten
or loosen adjustment on wing nut
accordingly.
Mounting Screws
Lock Sensor Assembly