Chamberlain MH User manual

OWNER'S MANUAL

MODELS:

MJ ✦MH ✦HMJ

INDUSTRIAL DUTY DOOR OPERATOR

NOT FOR RESIDENTIAL USE

Serial #

(located on electrical box cover)

Installation Date

Wiring Type

2 YEAR WARRANTY

C2 Wiring

FACTORY SET

See page 8 for

other wiring

configurations

41B6

SAFETY

DISCONNECT :

Model MJ: Floor level disconnect for emergency

manual door operation.

Model MH: Floor level chain hoist with electrical interlock

for emergency manual door operation.

Model HMJ: Includes both floor level disconnect systems

described above.

REVERSING EDGE:...............(Optional) Electric or

pneumatic sensing device attached to the bottom edge

of door.

A REVERSING EDGE IS STRONGLY RECOMMENDED

FOR ALL COMMERCIAL OPERATOR

INSTALLATIONS. REQUIRED WHEN THE 3 BUTTON

CONTROL STATION IS OUT OF SIGHT OF DOOR OR

ANY OTHER CONTROL (AUTOMATIC OR MANUAL)

IS USED.

SPECIFICATIONS

ELECTRICAL

TRANSFORMER:.............24Vac

CONTROL STATION: ......NEMA 1 3-button station.

OPEN/CLOSE/STOP

WIRING TYPE:.................C2 (Standard)

Momentary contact to OPEN & STOP, constant

pressure to CLOSE, open override plus wiring for

sensing device to reverse. See pages 13 and 14 for

optional control settings and operating modes.

LIMIT ADJUST: ................Linear driven, fully

adjustable screw type cams. Adjustable to 24 feet.

10.88"

MOUNTING DIMENSIONS

A - Wall Mounting

B - Bracket Mounting (rolling door)

Hand Chain Wheel

present with Model

MH only.

15.78"

6.34" 6.34"

12.69"

7.00"

6.13"

3.63"

9.19"

18.50"

2.91"

7.00"

14.75"

WEIGHTS AND DIMENSIONS

HANGING WEIGHT: .........80-110 LBS.

MOTOR

TYPE: .................................Intermittent duty

HORSEPOWER: ................1/2 HP

SPEED:...............................1000 RPM

VOLTAGE: ..........................115V 1 Phase 60Hz,

230V 1 Phase 50Hz

CURRENT:..........................See motor nameplate

MECHANICAL

DRIVE REDUCTION:.............Primary: Heavy duty

(4L) V-Belt. Secondary: #48 chain/sprocket. Output:

#48 chain

OUTPUT SHAFT SPEED:.....80 RPM

DOOR SPEED: ......................approx. 9" per sec.

depending on door

BRAKE (Optional): ...............Solenoid actuated disc

brake

BEARINGS: ...........................IronCopper sintered and

oil impregnated.

HAND CHAIN WHEEL: .........Left or right handing

Models MH and HMJ

only.

Output Shaft Key

Drive Sprocket

(2) Set Screws

PREPARATION

It is imperative that the wall or mounting surface

provide adequate support for the operator.

This surface must:

a. Be rigid to prevent play between operator and

door shaft.

b. Provide a level base.

c. Permit the operator to be fastened securely and

with the drive shaft parallel to the door shaft.

The safety and wear of the operator will be adversely

affected if any of the above requirements are not met.

For metal buildings, fasten 2" x 2" x 3/16" (or larger)

angle iron frames to the building purlins. Retain

5-1/2" between frames (Figure 1).

All MJ, MH, and HMJ series operators have dual output shafts and may be mounted on either the right (standard)

or left side of door, and in either a vertical (standard) or horizontal mounting position. If you need to move the drive

sprocket, loosen BOTH set screws, remove the sprocket and key, and place on the opposite side of the drive shaft.

Be sure to tighten BOTH set screws securely

Hand Chain Handing

For MH and HMJ models with manual hoist hand chain systems, the handing of the operator must be determined

at the time of order. The handing is indicated by last letter of the model name (R or L). The hand chain wheel

can not be switched on site. If your installation causes the hand chain to hang in the door opening, hook the

chain off to the side near the top of the door jamb.

IMPORTANT SAFETY NOTES

To prevent possible SERIOUS INJURY or DEATH:

• DO NOT connect electric power until instructed to do so.

• If the door lock needs to remain functional, install an interlock

switch.

• ALWAYS call a trained professional door serviceman if door

binds, sticks or is out of balance. An unbalanced door may not

reverse when required.

• NEVER try to loosen, move or adjust doors, door springs,

cables, pulleys, brackets or their hardware, ALL of which are

under EXTREME tension and can cause SERIOUS PERSONAL

INJURY.

• Disable ALL locks and remove ALL ropes connected to door

BEFORE installing and operating door operator to avoid

entanglement.

WARNING

CAUTION WARNING

WARNING

5-1/2" (13.97 cm)

Shaft Support Bracket

with Bearing (Not Provided)

Door Sprocket

OPTIONAL

Mounting Bracket

P/N 08-9098

OPTIONAL

Mounting Bracket

P/N 10-9095

Optimum Distance

12 - 15"

1b. Bracket or Shelf Mounting

The operator may be mounted either above or

below the door shaft. The optimum distance

between the door shaft and operator drive shaft is

between 12" - 15" (Figure 4).

1a. Wall Mounting

The operator should generally be installed below

the door shaft, and as close to the door as

possible. The optimum distance between the door

shaft and operator drive shaft is between 12" - 15"

(Figure 3).

INSTALLATION

IMPORTANT: The shelf or bracket must

provide adequate support, prevent play

between operator and door shaft, and permit

operator to be fastened securely and with the

drive shaft parallel to the door shaft.

1c. Place door sprocket on the door shaft. Do not

insert the key at this time.

2. Place drive sprocket on the appropriate side of the

operator. Do not insert the key at this time.

3. Wrap drive chain around door sprocket and join

roller chain ends together with master link.

4. Raise operator to approximate mounting position

and position chain over operator sprocket.

5. 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.

6. Align sprockets and secure (Figure 5).

Typical Right Hand

Wall Mounted Operator

Optimum Distance

12 - 15"

FIGURE 4

FIGURE 3

Important NOTE: Before your operator is installed, be sure the door has been properly aligned and is working

smoothly. The operator may be wall mounted or mounted on a bracket or shelf. If necessary, refer to the operator

preparations on page 3. Refer to the illustration and instructions below that suits your application.

Be sure door

sprocket is properly

aligned with drive

before securing to

the shaft.

Chain Retaining

Bracket

FIGURE 5

Keyhole Bracket

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 (small 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 (large chain).

3. The disconnect chain must be released from the

chain keeper before the door will operate again

electrically.

7. Install Hand Chain (Models MH and HMJ only)

Place hand chain around hand chain wheel. Be

sure to pass it through both openings in the chain

guide. Remove enough links so chain hangs

approximately two feet above the floor

MANUAL OPERATION

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

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. Release the disconnect chain to operate the

door again electrically.

8. Mount Chain Keeper / Keyhole Bracket

Using suitable hardware mount the chain keeper

approximately 4 feet above the floor, near the free

hanging chain. Remove disconnect sash chain

from bag and place the end through the keyhole in

the the chain keeper. Remove excess links if

necessary.

Manual Disconnect for Models MJ and HMJ

Electrical Interlock with Hoist for Models MH and HMJ

Chain Retaining Bracket

(with pad locking provisions)

Model HMJ

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 above for hoist

operation.

2. Refer to Model MJ instructions above for manual

operation.

To prevent possible SERIOUS INJURY from a moving chain,

DISCONNECT electric power to the operator BEFORE manually

operating your door.

WARNING

CAUTION WARNING

WARNING

Retaining Plate

CLOSE Limit Switch

SAFETY

(Aux. Close) Limit Switch

OPEN Limit Switch

Aux. OPEN

Limit Switch

LIMIT SWITCH ADJUSTMENT

NOTE: Make sure the limit nuts are positioned between the limit switch actuators before proceeding with

adjustments.

If other problems persist, call our toll-free number for

assistance - 1-800-528-2806.

1. To adjust limit nuts depress retaining plate to allow

nut to spin freely. After adjustment, release plate

and ensure it seats fully in slots of both nuts.

2. To increase door travel, spin nut away from

actuator. To decrease door travel, spin limit nut

toward actuator.

3. Adjust open limit nut so that door will stop in open

position with the bottom of the door even with top

of door opening.

4. Repeat Steps 1 and 2 for close cycle. Adjust close

limit nut so that actuator is engaged as door fully

seats at the floor.

SENSING EDGES

All types of sensing edges with an isolated normally

open (N.O.) output are compatible with your operator.

This includes pneumatic and electric edges. If your

door does not have a bottom sensing edge and you

wish to purchase one, contact the supplier of your

operator.

If not pre-installed by the door manufacturer, mount

the sensing edge on the door according to the

instructions provided with the edge. The sensing

edge may be electrically connected by either coiled

cord or take-up reel. Refer to the steps below.

Important Notes:

a. Proceed with Limit Switch Adjustments before

making any sensing edge wiring connections to

operator as described below.

b. Electrician must hardwire the junction box to the

operator electrical box in accordance with local

codes.

ENTRAPMENT PROTECTION ACCESSORIES (OPTIONAL)

WIRING:

For wiring of your sensing device to the operator, refer

to the wiring diagram supplied with your operator.

See field connection terminals identified as Sensing

Device or Safety Edge.

TAKE-UP REEL: Take-up reel should be installed 12"

above the top of the door.

COIL CORD: Connect operator end of coil cord to

junction box (not supplied) fastened to the wall

approximately halfway up the door opening.

To reduce the risk of SEVERE INJURY or DEATH, ALWAYS

install reversing sensors when the 3-button control station is

out of sight of door or ANY other control (automatic or manual)

is used. Reversing devices are recommended for ALL

installations.

WARNING

CAUTION WARNING

WARNING

To avoid SERIOUS PERSONAL INJURY or DEATH from

electrocution, disconnect electric power BEFORE manually

moving limit nuts.

WARNING

CAUTION WARNING

WARNING

To reduce the risk of SEVERE INJURY or DEATH:

• ANY maintenance to the operator or in the area near the

operator MUST NOT be performed until disconnecting the

electrical power and locking-out the power via the operator

power switch. Upon completion of maintenance the area

MUST be cleared and secured, at that time the unit may be

returned to service.

• Disconnect power at the fuse box BEFORE proceeding.

Operator MUST be properly grounded and connected in

accordance with local electrical codes. The operator should

be on a separate fused line of adequate capacity.

• All electrical connections MUST be made by a qualified

individual.

• DO NOT install ANY wiring or attempt to run the operator

without consulting the wiring diagram. We recommend that

you install an optional reversing edge BEFORE proceeding

with the control station installation.

• ALL power wiring should be on a dedicated circuit and well

protected. The location of the power disconnect should be

visible and clearly labeled.

• ALL power and control wiring must be run in separate

conduit.

• To avoid damage to door and operator, make ALL door locks

inoperative. Secure locks(s) in “OPEN” position. If the door

lock needs to remain functional, install an interlock switch.

WARNING

CAUTION WARNING

WARNING

Three (3) 7/8" & 1-1/6" DIA. Knockouts

for Power & Control Wiring access

(Near & Opposite side)

POWER WIRING

ON THREE PHASE MACHINES ONLY!

Incorrect phasing of the power supply will cause the motor to rotate in the wrong direction (open when CLOSE

button is pressed and vice-versa). To change motor rotation, exchange incoming power leads L1 and L2.

CONDUIT ACCESS

1. Remove the cover from the electrical enclosure.

Inside this enclosure you will find the wiring diagram(s)

for your unit. Refer to the diagram (glued on the inside

of the cover) for all connections described below. If this

diagram is missing, call the number on the back of this

manual. DO NOT INSTALL ANY WIRING OR

ATTEMPT TO RUN THIS OPERATOR WITHOUT

CONSULTING THE WIRING DIAGRAM.

2. Be sure that the power supply is of the correct

voltage, phase, frequency, and amperage to supply

the operator. Refer to the operator nameplate on the

cover.

3. Using the 1-1/16" dia conduit access hole as

shown below, bring supply lines to the operator and

connect wires to the terminals indicated on the

WIRING CONNECTIONS DIAGRAM.

4. Important NOTE: Connect earth ground to the

chassis ground screw in the electrical box enclosure.

Do not turn power on until you have finished making all

power and control wiring connections and have

completed the limit switch adjustment procedure.

POWER WIRING CONNECTIONS

WIRING

This Operator has

Control Wiring.

SUPPLEMENTAL WIRING DIAGRAM(S)

REPLACEMENT WIRING DIAGRAM

Note: Supplemental Wiring Diagrams are

to be used in addition to 1753 or 1754.

Replacement Wiring Diagram is to be used

in place of 1753 or 1754.

SPECIAL CONTROL

WIRING DATA

Wiring

Type

WARNING

TO PREVENT ENTRAPMENT

DO NOT START DOOR DOWNWARD

UNLESS DOORWAY IS CLEAR

OPEN

COL ES

ESO

STOP

Control Station

WARNING Notice

Push

Buttons

CONTROL WIRING

LOCATING THE CONTROL STATION

All operators are supplied with some type of control station. Generally a three button station

(OPEN/CLOSE/STOP) is provided. A two-position key switch or control station (OPEN/CLOSE) may be added or

substituted when requested at the time of order. Mount the control station near the door.

IMPORTANT: Mount WARNING NOTICE beside or

below the push button station.

MOUNT WARNING NOTICE

Standard C2 or B2 Wiring

Standard operators are shipped from the factory with

jumper set for C2 wiring, which requires constant

pressure on button to close the door. If momentary

contact on close direction is desired (B2 wiring) you

must include an entrapment protection device. See

close control settings to the right.

Constant pressure on close (C2 wiring)

In the electrical enclosure, a RED wire was placed on

terminal block #12. With this setting, the operator will

require constant pressure on close control in order to

keep door moving in the close direction.

Wiring Diagram label on inside cover

of electrical box

SPECIAL CONTROL WIRING

If your operator was shipped from the factory with

non-standard control wiring or with optional

accessories that require addition instructions, refer to

the wiring diagram(s) indicated in the special control

wiring data box. When a replacement wiring diagram

is present, wiring diagrams in this manual will not

apply. Refer only to the replacement wiring diagram

for all connections.

To prevent possible SERIOUS INJURY or DEATH, install

reversing sensors when the 3-button control station is out of

sight of the door or ANY other control (automatic or manual) is

used. Reversing devices are recommended for ALL

installations.

WARNING

CAUTION WARNING

WARNING

DETERMINE WIRING TYPE

Refer to the wiring diagram located on the inside cover the electrical box to determine the type of control wiring.

Momentary contact on close (B2 wiring)

Move RED wire from terminal block #12 to terminal #2.

The operator will require only momentary contact to

close the door.

CONTROL WIRING (cont’d)

Radio Controls

On all models with type C2 control wiring, a terminal

bracket marked R1 R2 R3 is located on the outside of

the electrical enclosure. All standard radio receivers

(single channel residential type) may be mounted to this

bracket. The operator will then open a fully closed door, close a fully open door, and reverse a closing door from

the radio transmitter. However, for complete door control from a remote, a commercial three-channel radio receiver

(with connections for OPEN/CLOSE/STOP) is recommended.

Additional Access Control Equipment

Locate any additional access control equipment as desired (but so that the door will be in clear sight of the person

operating the equipment), and connect to the terminal block in the electrical enclosure as shown on the FIELD

WIRING CONNECTIONS diagram. Any control with a normally (N.O.) isolated output contact may be connected

in parallel with the OPEN button. More than one device may be connected in this manner. Use 16 gauge wire or

larger for all controls. DO NOT USE THE CONTROL CIRCUIT TRANSFORMER (24VAC) IN THE OPERATOR TO

POWER ANY ACCESS CONTROL EQUIPMENT OTHER THAN A STANDARD RESIDENTIAL TYPE RADIO

RECEIVER.

External Interlock Switch

The operator has a terminal connection for an external interlock switch. This switch must be a normally closed

(N.C.) two-wire device with a contact rating of at least 3 amps @ 24VAC. When such a switch is connected as

shown on the FIELD WIRING CONNECTIONS diagram, the control circuit will be disabled when the switch is

actuated, thereby preventing electrical operation of the door from the control devices.

CLUTCH ADJUSTMENT

1. Remove cotterpin from nut on the clutch shaft.

2. Back off clutch nut until there is very little tension

on the clutch spring.

3. 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. When the clutch is properly

adjusted, it should generally be possible to stop

the door by hand during travel.

4. Reinstall cotterpin.

NOTE: The adjustable friction clutch is NOT an

automatic reversing device. An electric or

pneumatic reversing edge can be added to bottom

edge of door if desired.

To prevent possible SERIOUS INJURY or DEATH, install

reversing sensors when the 3-button control station is out of

sight of the door or any other control (automatic or manual) is

used. Reversing devices are recommended for ALL

installations.

WARNING

CAUTION WARNING

WARNING

To prevent possible SERIOUS INJURY or DEATH from a moving

gate or garage door:

• ALWAYS keep remote controls out of reach of children.

NEVER permit children to operate, or play with remote

controls.

• Activate gate or door ONLY when it can be seen clearly, is

properly adjusted, and there are no obstructions to door

travel.

• ALWAYS keep gate or garage door in sight until completely

closed. NEVER permit anyone to cross path of moving gate

or door.

WARNING

CAUTION WARNING

WARNING

Install the control station and receiver where the door is

visible, but away from the door and its hardware. When a

receiver is used to activate a commercial door opener, a

reversing edge MUST be installed on the bottom of the door.

Failure to install a reversing edge under these circumstances

may result in SERIOUS INJURY or DEATH to persons trapped

beneath the door.

WARNING

CAUTION WARNING

WARNING

Cotterpin

Adjusting Nut

Spring

Clutch Pulley

Clutch Plate

Clutch Pad

Washer

TEST THE SYSTEM

Turn on power. Test all controls and safety devices to

make sure they are working properly. It will be

necessary to refer back to page 6 for fine adjustment

of the limit switches.

IMPORTANT NOTES:

• Do not leave operator power on unless all safety

and entrapment protection devices have been

tested and are working properly.

• Be sure you have read and understand all Safety

Instructions included in this manual.

• Be sure the owner or person(s) responsible for

operation of the door have read and understand

the Safety Instructions, know how to electrically

operate the door in a safe manner, and know how

to use the manual disconnect operation of the door

operating system.

ADJUSTMENT

A solenoid brake is an optional modification. If present, the brake is adjusted at the factory and should not need

additional adjustment for the the life of the friction pad. If desired, a brake can also be field installed. To order a

kit for field installation on an existing operator, call the parts and service department at 1-800-528-2806.

Replace friction pads when necessary. Refer to the

illustration for identification of components for the

solenoid type brake system.

Release Lever

Pulley

Friction Pad

Solenoid

Solenoid Brake System

To reduce the risk of SEVERE INJURY or DEATH:

• ANY maintenance to the operator or in the area near the

operator MUST NOT be performed until disconnecting the

electrical power and locking-out the power via the operator

power switch. Upon completion of maintenance the area

MUST be cleared and secured, at that time the unit may be

returned to service.

• Disconnect power at the fuse box BEFORE proceeding.

Operator MUST be properly grounded and connected in

accordance with local electrical codes. The operator should

be on a separate fused line of adequate capacity.

• All electrical connections MUST be made by a qualified

individual.

• DO NOT install ANY wiring or attempt to run the operator

without consulting the wiring diagram. We recommend that

you install an optional reversing edge BEFORE proceeding

with the control station installation.

• ALL power wiring should be on a dedicated circuit and well

protected. The location of the power disconnect should be

visible and clearly labeled.

• ALL power and control wiring MUST be run in separate

conduit.

WARNING

CAUTION WARNING

WARNING

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