Broken Spring(s) may cause the door to fall rapidly,
causing SEVERE INJURY or DEATH.
If possible
only use the manual release when the door is closed,
otherwise use caution when using the release while the
door is open.
Moving chain could
cause possible SERIOUS
INJURY.
DISCONNECT
electric power to the
operator BEFORE manually
operating your door
IMPORTANT NOTE: Before your operator is installed, be sure the door has been properly aligned, balanced, and is working
smoothly.
Sash Chain
Hand Chain
Sash Chain Lock
Wall Bracket
Pull Ring
INSTALLATION
1. Wall Mount:
A 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 12-1/2” - 15-1/2”
(Figure 2)
B Place the door sprocket on the door shaft. Do not
insert the key at this time.
C Ensure the drive sprocket on the operator is on the
appropriate side.
D Wrap the drive chain around the door sprocket and
join the roller chains end together with master link.
(NOTE: The chain may need to be made shorter
depending on the operator mounting position)
E Raise the operator to approximate mounting position
and position the chain over the operator drive
sprocket.
F Raise or lower the operator until the chain is taut (not
tight). Make sure the operator output shaft is parallel
to the door shaft and secure the operator in position.
G Align the door sprocket to the operator drive sprocket
(Figure 3), insert the key, and secure with BOTH set
screws.
2. Install Hand Chain (Models MDJH and MDJBH
only):
Thread hand chain around hand chain wheel
ensuring that it passes through both openings in the
hand chain guide. Remove enough links that so that
the loop hangs approximately two feet above the floor.
3. Mount Manual Disconnect/Chain Keeper:
Using
suitable hardware, mount the manual disconnect
directly beneath the operator approximately four
(4) feet above the floor. Install the sash chain on
the spring that hangs from the operator and thread
through the sach chain lock (Figure 4, page 5). Pulling
down on the sash chain pull ring, should disengage
the motor from door assembly allowing for manual
operation.
Optimum Distance
12 1/2" - 15 1/2"
Use Speader Bars
as Applicable
MDJ, MDJH, MDJB, MDJBH
MANUAL OPERATION
MDJ, MDJH, MDJB, MDJBH
FIGURE 3
Be sure door
sprocket is properly
aligned to drive
sprocket before
securing to the shaft
FIGURE 2
FIGURE 4
FIGURE 5
This operator has provisions for manually operating the door in case of emergency or power failure.
1. Pull the sash chain down until it is tight. Then lock it into the sash chain lock in the wall bracket (Figure 4). This will
disengage the motor. It will also engage the hoist mechanism if present.
2. Operate the door manually as desired.
3. To return to electrical operation, release the sash chain from the lock (Figure 4).
WARNING
WARNING
WARNING
4
5
Moving parts on the operator could cause possible SERIOUS INJURY.
Install the
operator at least 8 feet above the floor to keep people away from the moving parts.
NOTE: When pulling the release mechanism, the manual disconnect switch circuit will open to stop motor movement from
occuring (Figure 5).
Manual Disconnect Switch
