Liftmaster MH Medium-Duty Hoist Operator User Manual download pdf

Be sure door sprocket is properly

aligned with operator drive sprocket before

securing to the shaft.

Chain Retaining Bracket

(4 feet above floor)

Optimum Distance

12" - 15"

Optimum Distance

" - 15"

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.

Keyhole Bracket

ELECTRICAL INTERLOCK WITH HOIST

FOR MODELS MH AND MHS

This QuickStart is intended to highlight a typical installation. These instructions are not intended to be comprehensive. Since each application is unique, it is the

responsibility of the purchaser, designer, installer and end user to ensure that the total door system is safe for its intended use. Please consult the manual and/or a

qualified technician for further information.

NOTE: Intended for Professional Installation Only. Visit www.liftmaster.com to locate a professional installing dealer in your area.

AN ENTRAPMENT PROTECTION DEVICE IS HIGHLY RECOMMENDED

QuickStart

for the Model MJ/MH/MHS/MGJ Door Operator

MEDIUM DUTY LOGIC

INSTALLATION

Determine Mounting Location for Operator

Wall Mount: The operator should generally be installed below

the door shaft, and as close to the door as possible.

Bracket Shelf Mount: The operator may be mounted either

above or below the door shaft.

NOTE: The optimum distance between the door shaft and

operator drive shaft is between 12 - 15 inches.

Install the Operator

Place door sprocket on the door shaft. Do not insert the key at

this time.

Place drive sprocket on the appropriate side of the operator.

Do not insert the key or set screw at this time.

Wrap chain drive around door sprocket and join roller chain

ends together with master link.

Raise operator to approximate mounting position and position

chain over operator sprocket.

Raise or lower operator until the chain is taut (not tight). Make

sure the operator output shaft is parallel to door shaft and

sprockets are aligned. When in position, secure the operator to

wall or mounting bracket.

Align sprockets, insert key into keyway, and secure.

Place hand chain around hand chain wheel (if provided).

Power and Ground Wiring Connections

Run the power wires through the power wiring conduit hole in

the electrical box enclosure. Connect the power to the operator.

Connect the earth ground to the ground screw in the electrical

box enclosure. Follow ALL local electrical codes.

Run control wires through the control wiring conduit hole in the

electrical box enclosure. Follow ALL local electrical codes.

Adjust the limit switches to open and close door properly. Make

sure the limit nuts are positioned between the limit switches

before proceeding with adjustments.

Remove cotter pin from nut on the clutch shaft. Back off clutch

nut until there is very little tension on the clutch spring. Tighten

clutch nut gradually until there is just enough tension to permit

the operator to move the door smoothly but to allow the clutch

to slip if the door is obstructed. Reinstall cotter pin when

finished.

Adjustments

Troubleshooting instructions inside cover of operator.

Wall Mount Bracket Shelf Mount

Optional Mounting Bracket

Door Shaft

Door Sprocket

Operator Drive

Sprocket

Drive Chain

Hand Chain

Hand Chain Wheel

Clutch Shaft

MANUAL DISCONNECT

Model MH

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.

Operate the door in the desired direction by pulling on one side or the other of the

continuous loop hoist chain.

The disconnect chain must be released from the chain retaining bracket before the door

will operate again electrically.

Models MJ and MGJ

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.

The door may now be pushed up or pulled down manually.

Release the disconnect chain or reset the emergency egress device to operate the door

again electronically.

This operator has a floor level disconnect chain to disconnect the door from the door operator.

These operators are equipped with a manual hoist. An electrical interlock will disable the

electrical controls when the hoist is used.

Model MHS

Refer to Model MH instructions for hoist operation.

Refer to Model MJ instructions for manual operation.

This operator includes both a floor level disconnect sash chain to disconnect the door from

the door operator and a disconnect sash chain with manual hoist operation that electrically

disables the operator controls.

Chain Keeper

Turn off power to the operator BEFORE manually operating your door.

When operator is disconnected by manual operation chain, hoist and electrical operation

will not function.

MANUAL DISCONNECT FOR MODELS MJ

1 2

QuickStart 1
MEDIUM DUTY LOGIC 2

Summary of Contents

Page 1 - QuickStart

Be sure door sprocket is properlyaligned with operator drive sprocket before securing to the shaft.Chain Retaining Bracket(4 feet above floor)Optimum

Page 2 - MEDIUM DUTY LOGIC

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Liftmaster MH Medium-Duty Hoist Operator User Manual

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Summary of Contents

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