Emergency Disconnect System - Chamberlain MHS Installation Manual

This operator has provisions for manually operating the door in
case of emergency or power failure. Refer to the appropriate
instructions below for your model operator.
MODEL MH
These operators are equipped with a manual hoist. An electrical
interlock will disable the electrical controls when the hoist is
used. To operate the hoist:
1. Pull the disconnect chain (sash chain) to engage the hoist
mechanism. The disconnect chain may be locked in position
by slipping the end through the keyhole of the chain keeper
mounted on the wall.
2. Operate the door in the desired direction by pulling on one side
or the other of the continuous loop hoist chain.
3. The disconnect chain must be released from the chain keeper
before the door will operate again electrically.
MODEL MJ
This operator has a floor level disconnect chain to disconnect the
door from the door operator.
1. To disengage, pull the chain and secure in the disengaged
position by slipping the end through the keyhole bracket
mounted on the wall. Or if emergency egress device is used,
pull handle to disengage operator from door.
2. The door may now be pushed up or pulled down manually.
3. Release the disconnect chain or reset the emergeny egress
device to operate the door again electrically.
MODEL MHS
This operator includes both a floor level disconnect chain to
disconnect the door from the door operator and a disconnect
chain with manual hoist to electrically disable the operator
controls.
1. Refer to Model MH instructions for hoist operation.
2. Refer to Model MJ instructions for manual operation.
When operator is disconnected by the manual operation chain,
hoist and electrical operation will not function.
M A N U A L D I S C O N N E C T
To prevent possible SERIOUS INJURY from a moving chain:
• DISCONNECT electric power to the operator BEFORE
• If possible, use emergency disconnect ONLY when door is
• NEVER use emergeny disconnect unless doorway is clear
21
WARNING
CAUTION CAUTION
manually operating your door.
CLOSED. Weak or broken springs or unbalanced door
could result in an open door falling rapidly and/or
unexpectedly.
of persons and obstructions.
Chain Keeper
(with pad locking provisions)
AVERTISSEMENT
ATTENTION
Electrical Interlock with Hoist for Models MH and MHS
Keyhole Bracket
ADVERTENCIA
PRECAUCIÓN
Manual Disconnect for Models MJ