To prevent SERIOUS INJURY or DEATH:
•
DO NOT connect electric power until instructed to
do so.
•
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.
MOTOR
It is imperative that the wall or mounting surface provide
adequate support for the operator.
The surface must:
a. Be rigid to prevent play between operator and door
shaft. (Spreader bars will also be of aid when the door
shaft is not supported properly by an end bearing)
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
effected 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 7-1/2” between
frames (Figure 1).
SAFETY
SPECIFICATIONS
TYPE:
Intermittent duty
HP:
1/2 HP
SPEED:
1500 RPM
VOLTAGE:
115V 1 Phase 60Hz
CURRENT:
See motor nameplate
ELECTRICAL
TRANSFORMER:
24VAC
CONTROL STATION:
3-button station
OPEN/CLOSE/STOP
WIRING TYPE:
B2 (Standard, when powered)
C2 (When photoeyes are
blocked or not present)
LIMIT ADJUST:
Linear driven, fully adjustable
screw type cams. Adjustable to
24 feet.
MDJ, MDJH, MDJB, MDJBH
MECHANICAL
SAFETY
PREPARATION
MDJ, MDJH, MDJB, MDJBH
All MDJ, MDJH, MDJB, and MDJBH operators have dual
output shafts and may be mounted on either the right
(standard) or the left side of the door. Install the sprocket on
the side desired and insert the key. Be sure to tighten Both
set screws securely.
DRIVE REDUCTION:
Primary: Heavy duty (4L) V-Belt
Secondary: #41 chain/sprocket
Output: #41 chain
OUTPUT SHAFT
SPEED:
27 RPM
DOOR SPEED:
Approx. 5.4” per sec. depending
on door.
BRAKE (Optional):
Solenoid actuated drum brake
BEARINGS/BUSH-
INGS:
Ball bearing with hardened
races & Oil Impregnated
Bushings
HAND CHAIN
WHEEL(optional):
Left or Right
DIMENSIONS & WEIGHT
HANGING WEIGHT:
65-75 LBS
SHIPPING WEIGHT:
85-95 LBS
DISCONNECT:
All Models: Floor level
disconnect for manual door
operation.
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.
WARNING
WARNING
TO ACCOMODATE
10" HOLE SPACING
2
3
Improperly operating or
an unbalanced door could
cause SERIOUS INJURY
or DEATH.
See Door
Manufacturer’s Owner’s Manual. Have trained
door systems technicians make repairs to
cables, spring assemblies, and other hardware.
IMPORTANT NOTE: To aid installation, see page 16
(Shop Drawing) for mounting consideration.
