Chamberlain GH User manual

OWNER'S MANUAL
MODEL GH
INDUSTRIAL DUTY DOOR OPERATOR
Serial #
(located on electrical box cover)
Installation Date
Wiring Type
2 YEAR WARRANTY
C2 Wiring
F A C T O R Y S E T
See page 8 for
other wiring
configurations
NOT FOR RESIDENTIAL USE
LISTED DOOR OPERATOR
41B6

2
SPECIFICATIONS
14.00”
WEIGHTS AND DIMENSIONS
HANGING WEIGHT: .........80-110 LBS.
Hand Chain Wheel
See
Note #1
See
Note #2
A
X
B
Y
C
D
Y
See
Note #3
A
11-1/2
12-1/2
12-3/4
12-3/4
11
11
12
12-1/2
12-3/4
13-1/4
B
25-3/4
26-3/4
27
27
25-1/4
25-1/4
26-1/4
26-3/4
27
28-5/8
C
12-63/64
12-63/64
12-63/64
13-63/64
12-63/64
12-63/64
12-63/64
13-63/64
13-63/64
15-15/64
D
3
3
3
3-1/2
3
3
3
3-1/2
3-1/2
3
1/2
3/4
1
1-1/2
1/2
3/4
1
1-1/2
2
3
1
1
1
1
3
3
3
3
3
3
HP DIMENSIONS
NOTES:
1) Output Shaft with 1” x 1/4” Key for 1/2 thru 2Hp operators, 1-1/4” x 1/4” Key for 3Hp operators.
2) MT’G CENTERS: X = 4-3/4”; Y = 5-1/2” for 1/2 thru 2Hp operators
X = 7-17/32”; Y = 9-1/16” for 3Hp operators
3) Hand Chain Wheel extends 1-5/8” beyond operator in vertical mounting position as shown.
MECHANICAL
DRIVE REDUCTION:.............40:1 Reduction
Heavy duty bronze worm
gear reducer
OUTPUT SHAFT SPEED:.....43 R.P.M.
DOOR SPEED:......................4 - 10" per sec.
depending on door
BRAKE: .................................Solenoid actuated disc
brake
HOIST WHEEL:.....................Standard mounting on
left or right side
SAFETY
DISCONNECT: .............Floor level chain hoist with elect-
rical interlock for emergency manual door operation
CLUTCH: (optional)....Adjustable torque limiter type
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.
MOTOR
TYPE: .................................Continuous duty
HORSEPOWER:.................1/2, 3/4, 1 & 1-1/2 Hp
Single or Three phase
2 HP Three phase
SPEED:...............................1725 RPM
VOLTAGE: ..........................115, 220, 230 Single phase
230, 460, 575 Three phase
CURRENT: .........................See motor nameplate
ELECTRICAL
TRANSFORMER:.............24VAC
CONTROL STATION: ......NEMA 1 three button station.
OPEN/CLOSE/STOP
WIRING TYPE:.................C2 (Standard)
Momentary contact to OPEN/CLOSE/STOP plus wiring
for sensing device to reverse and auxiliary devices to
open and close with open override.
(Other types available. See chart, Pg. 8)
LIMIT ADJUST:................Linear driven, fully
adjustable screw type cams. Adjustable to 30 feet.
PHASE

3
2-1/4"
FIGURE 1
Shaft Support Bracket
with Bearing (Not Supplied)
Door Sprocket
TO AVOID DAMAGE TO DOOR AND OPERATOR,
MAKE ALL DOOR LOCKS INOPERATIVE. SECURE
LOCK(S) IN "OPEN" POSITION.
IF THE DOOR LOCK NEEDS TO REMAIN
FUNCTIONAL, INSTALL AN INTERLOCK SWITCH.
DO NOT CONNECT ELECTRIC POWER UNTIL
INSTRUCTED TO DO SO.
KEEP DOOR BALANCED. STICKING OR BINDING
DOORS MUST BE REPAIRED. DOORS, DOOR
SPRINGS, CABLES, PULLEYS, BRACKETS AND
THEIR HARDWARE MAY BE UNDER EXTREME
TENSION AND CAN CAUSE SERIOUS PERSONAL
INJURY. CALL A PROFESSIONAL DOOR
SERVICEMAN TO MOVE OR ADJUST DOOR
SPRINGS OR HARDWARE.
WARNING
CAUTION
CAUTION
WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING
SITE PREPARATIONS
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. See Figure 1.
OPERATOR PREPARATION
IMPORTANT SAFETY NOTES
5-1/2”
CAUTION
CONNECT REVERSING EDGE
SWITCH - SEE INSTALLATION
INSTRUCTIONS
FORINDOORUSEONLY
INSTALLMORETHAN8FT.ABOVEDOOR
LOCATECONTROLSTATIONSOTHATDOORISWITHIN
SITEOFPERSONOPERATINGTHECONTROL.DOOR
MUSTBECONTROLLEDBY3BUTTONSTATION
Cotterpin
Disconnect Lever
Cutout for Rollpin
(typical both sides)
Hand
Chain Wheel
Chain Guide
The GH operator may be mounted on either the right (standard) or left side of door, and in either a vertical
(standard) or horizontal mounting position. Refer to the steps below if you require the hand chain and/or
disconnect chain to be on the opposite side of the operator; Or if the operator is being mounted in a horizontal
position.
Hand Chain Right/Left Conversion
Remove the two snap rings (1 pc. outer, 1 pc inner)
on hand chain shaft assembly. Position roll-pin to fit
through cutout in frame and slide complete shaft
assembly through housing and bevel gear. Insert
shaft assembly on opposite side of housing, and
replace bevel gear, bearing, hardware, and snap rings
on the opposite side of shaft in the same manner.
Disconnect Lever Right/Left Conversion
Remove cotter pins on the ends of the disconnect
shaft (square shaft), move the disconnect lever arm to
the opposite side, and replace the cotter pins. Be
sure to keep two(2) 12ga. washers on the side without
the lever arm.
Horizontal Mounting Conversion
Remove cotter pins on the ends of the disconnect
shaft (square shaft), and remove lever. Replace lever
using square hole on opposite end of lever.
Reposition sash chain to opposite end of lever also.
Replace cotterpins.
FIGURE 2

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”.
Refer to Figure 3.
OPERATOR MOUNTING
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.
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”. Refer to Figure 4.
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, (see Figure 5).
FIGURE 4
FIGURE 3
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.
Typical Right Hand
Wall Mounted Operator
Optimum Distance
12 - 15”
Optimum Distance
12 - 15”
OPTIONAL
Mounting Bracket
P/N 08-9098
Be sure door
sprocket is properly
aligned with drive
before securing to
the shaft.
Chain Keeper
FIGURE 5

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.
5
7. Install Hand Chain
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
EMERGENCY 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 GH
Chain Keeper
(with pad locking provisions)
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.
Electrical Interlock with Hoist for Models H and HJ
TURN OFF POWER TO THE OPERATOR BEFORE
MANUALLY OPERATING YOUR DOOR.
WARNING
CAUTION
CAUTION
WARNING
WARNING
BRAKE ADJUSTMENT
The brake is adjusted at the factory and should not need additional adjustment for the the life of the friction pad.
Replace friction pads when necessary. Refer to the illustration for identification of components for the solenoid
type brake system.
Friction Pads
Release Lever
Plate Assembly
Solenoid
Solenoid Brake System
Actuator Plate

6
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER BEFORE MANUALLY MOVING LIMIT NUTS.
WARNING
LIMIT SWITCH ADJUSTMENT
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 actu-
ator. 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.
Retaining Plate
CLOSE Limit Switch
SAFETY
(Aux. Close) Limit Switch
OPEN Limit Switch
Actuator
Aux. OPEN Limit Switch
SENSING EDGES & PHOTO EYES
Sensing devices supplied for door industry type operators
with an isolated normally open (N.O.) output are compati-
ble with your operator. This includes pneumatic and elec-
tric edges, and through beam and retro reflective photo
eyes. If your door does not have a bottom sensing edge or
safety photo eyes and you wish to add a safety device to
your application, please contact your local LiftMaster
Authorized Dealer.
If not pre-installed by the door manufacturer, mount the
sensing edge on the door according to the instructions pro-
vided with the edge. The sensing edge may be electrical-
ly 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 oper-
ator 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 opera-
tor. 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.
IT IS STRONGLYRECOMMENDED THAT A
SAFETY PHOTO EYE OR SENSING EDGE BE
USED IN CONJUNCTION WITH THE OPERATOR.
NOTICE

7
WARNING
CAUTION
WARNING
WARNING
DISCONNECT POWER AT THE FUSE BOX BEFORE
PROCEEDING.
OPERATOR MUST BE PROPERLY GROUNDED AND
CONNECTED IN ACCORDANCE WITH LOCAL
ELECTRICAL CODES. NOTE: THE OPERATOR
SHOULD BE ON A SEPARATE FUSED LINE OF
ADEQUATE CAPACITY.
ALL ELECTRICAL CONNECTIONS MUST BE MADE
BY A QUALIFIED INDIVIDUAL.
WARNING
CAUTION
WARNING
WARNING
TO AVOID DAMAGE TO DOOR AND OPERATOR,
MAKE ALL DOOR LOCKS INOPERATIVE. SECURE
LOCK(S) IN "OPEN" POSITION.
IF THE DOOR LOCK NEEDS TO REMAIN
FUNCTIONAL, INSTALL AN INTERLOCK SWITCH.
1. 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.
2. Using the 1-1/16” dia conduit access knockout
as shown below, bring supply lines to the operator
and connect wires to the terminals indicated on the
WIRING CONNECTIONS DIAGRAM.
DO NOT TURN POWER ON UNTIL YOU HAVE
FINISHED MAKING ALL POWER AND CONTROL
WIRING CONNECTIONS AND HAVE COMPLETED
THE LIMIT SWITCH ADJUSTMENT PROCEDURE.
CAUTION: THIS UNIT MUST BE PROPERLY
GROUNDED. A GROUND SCREW IS SUPPLIED IN
THE ELECTRICAL BOX FOR CONNECTION OF
THE POWER SUPPLY GROUND WIRE. FAILURE
TO PROPERLY GROUND THIS UNIT COULD
RESULT IN ELECTRIC SHOCK AND SERIOUS
INJURY.
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.
POWER WIRING
POWER WIRING CONNECTIONS
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 correct
this, interchange any two of the incoming three phase
power lines.
CONDUIT ACCESS
WARNING
Do Not Run Power &
Control Wiring in the
Same Conduit
7/8” Dia Knockouts for
power wiring conduit access
(2 on end panel)
1-1/16’ Dia Knockout for
power wiring conduit access
(1 nearside)

8
CONTROL WIRING
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 jumper setting below.
Constant pressure on close (C2 wiring)
Red jumper wire was placed on terminal #2 in
electrical enclosure. The operator will require
constant pressure on close control in order to keep
door moving in the close direction.
Momentary contact on close (B2 wiring)
Move red jumper wire from terminal #2 to terminal
#3. The operator will require only momentary
contact to close the door.
WIRING DIAGRAM
This Operator has
Control Wiring.
SUPPLEMENTAL WIRING DIAGRAM(S)
REPLACEMENT WIRING DIAGRAM
Note: Supplemental Wiring Diagrams are
to be used in addition to 1742-1.
Replacement Wiring Diagram is to be used
in place of 1742-1.
SPECIAL CONTROL
WIRING DATA
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.
WARNING
INSTALL THE CONTROL STATION WHERE THE DOOR
IS VISIBLE, BUT AWAY FROM THE DOOR AND ITS
HARDWARE. IF CONTROL STATION CANNOT BE
INSTALLED WHERE DOOR IS VISIBLE, OR IF ANY
DEVICE OTHER THAN THE CONTROL STATION IS
USED TO ACTIVATE THE DOOR, A REVERSING EDGE
MUST BE INSTALLED ON THE BOTTOM OF THE DOOR.
FAILURE TO INSTALL AREVERSING EDGE UNDER
THESE CIRCUMSTANCES MAY RESULT IN SERIOUS
INJURYOR DEATH TO PERSONS TRAPPED
BENEATH THE DOOR.
WARNINGW A R N I N G
TO PREVENT ENTRAPMENT
DO NOT START DOOR DOWNWARD
UNLESS DOORWAY IS CLEAR
OPEN
CLOSE
STOP
Standard
Control Station
WARNING Notice
Push
Buttons
IMPORTANT: Mount WARNING NOTICE beside or
below the push button station.
MOUNT WARNING NOTICE
DETERMINE WIRING TYPE
Refer to the wiring diagram located on the inside cover the electrical box to determine the type of control wiring.
Wiring Diagram label on inside cover
of electrical box
Wiring
Type
SPECIAL CONTROL WIRING
If your operator was shipped from the factory with
non-standard control wiring or with optional acces-
sories 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.
IMPORTANT NOTE: If your wiring diagram is missing,
or you are unsure of the wiring type for your operator, con-
tact the customer service department @ 1-800-528-2806.

9
CONTROL WIRING (con’t)
Radio Controls
On all models with type B2 control wiring, a terminal
bracket marked R1 R2 R3 is located on the outside of
the electrical enclosure. All standard radio control
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 transmitter,
a commercial three-channel radio set (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.
WARNING
CAUTION
WARNING
WARNING
DO NOT USE RADIO CONTROLS WITH YOUR
OPERATOR UNLESS YOU HAVE INSTALLED
SOME TYPE OF ENTRAPMENT PROTECTION
DEVICE. THE USE OF RADIO CONTROLS
PRESENTS POTENTIAL HAZARDS DUE TO THE
USER’S ABILITY TO OPEN OR CLOSE THE
DOOR WHEN OUT OF SIGHT OF THE DOOR. IN
ADDITION, IF A SINGLE CHANNEL CONTROL IS
USED, THE USER WILL NOT BE ABLE TO STOP
THE DOOR FROM THE TRANSMITTER.
CLUTCH ADJUSTMENT (OPTIONAL MODIFICATION)
1. Loosen set screws on clutch nut.
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 adjusted, it should generally be
possible to stop the door by hand during travel.
CAUTION: The torque limiter clutch is NOT an
automatic reversing device. An electric or
pneumatic reversing edge can be added to bottom
edge of door if desired.
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER TO OPERATOR BEFORE ADJUSTING SLIP
CLUTCH.
WARNING
CAUTION
WARNING
WARNING

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.
WARNING
CAUTION
WARNING
WARNING
DO NOT PLACE HANDS OR TOOLS IN OR NEAR
THE OPERATOR WHEN THE POWER IS ON OR
WHEN TESTING CONTROL OR SAFETY
DEVICES. ALWAYS DISCONNECT POWER
BEFORE SERVICING OR ADJUSTING THE
OPERATOR.
The operator has been pre-wired to accept
connection of a reversing edge device. Connect the
normally open contacts to terminals T4 and T8 on the
low voltage terminal block. A cut-off switch will de-
activate the safety device during the last few inches of
the door's downward travel.
IF CONTROL STATION CANNOT BE INSTALLED WHERE
DOOR IS VISIBLE, OR IF ANY DEVICE OTHER THAN
THE CONTROL STATION IS USED TO ACTIVATE THE
DOOR,
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 PERSONAL INJURY OR
DEATH TO PERSONS TRAPPED BENEATH THE DOOR.
CONNECT REVERSING EDGE DEVICE (OPTIONAL)
NOTICE:
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case the
user will be required to correct the interference at his own expense.
WARNING
CAUTION
WARNING
WARNING