Chamberlain GH Owner's Manual page 9

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)
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 (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.
WARNING
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER TO OPERATOR BEFORE ADJUSTING SLIP
CLUTCH.
CAUTION
CONTROL WIRING (con't)
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
is
THE DOOR FROM THE TRANSMITTER.
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.
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WARNING
CAUTION
WARNING
WARNING
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