LiftMaster MGJ Installation Manual - Page 10

Install Emergency Disconnect System

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TYPICAL INSTALLATION INSTALL EMERGENCY DISCONNECT SYSTEM MODELS MH AND MHS ONLY The MHS operator includes both a floor level disconnect sash chain to disconnect the door from the door operator that allows manual push up operation and an additional sash chain to engage the manual chain hoist that also electrically disables the operator controls. MODELS MJ AND MGJ ONLY 1 Secure keyhole bracket to wall 4 feet above the floor. 1 Secure chain retaining bracket to wall 4 feet above the floor. 2 Wrap hand chain around hand chain wheel and through chain guide. Keyhole Bracket 3 Connect the ends of the hand chain. Hand Chain Wheel 4' above floor Chain Retaining Bracket (with pad locking provisions) Hand Chain Floor 4' 2' 10

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10
TYPICAL INSTALLATION
INSTALL EMERGENCY DISCONNECT SYSTEM
Floor
2'
4' above
floor
Wrap hand chain around hand chain wheel and through chain
guide.
Secure chain retaining bracket to wall 4 feet above the floor.
Connect the ends of the hand chain.
Hand
Chain
Hand Chain
Wheel
The MHS operator includes both a floor level disconnect sash
chain to disconnect the door from the door operator that allows
manual push up operation and an additional sash chain to engage
the manual chain hoist that also electrically disables the operator
controls.
Keyhole Bracket
Chain Retaining
Bracket
(with pad locking
provisions)
Secure keyhole bracket to wall 4 feet above the floor.
MODELS MH AND MHS ONLY
MODELS MJ AND MGJ ONLY
1
1
2
3
4'