Chamberlain HMJ, Owner'S Manual

Page: 9 / 24

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