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

2
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"
AA
AA
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
3
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

4
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

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
6
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
7
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
OPEN
COL ES
ESO
LC
STOP
Control Station
WARNING Notice
Push
Buttons
8
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.

9
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

10
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