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Dodge Engineering & Controls, Inc. 
Toll Free (877) 334-2875  Fax: (978) 244-1422 
 
Installation
 
EN221 and EN310 Non-Spring Return Electronic Actuators 
 
Manual Override 
To move the damper blades without power present, 
do the following: 
1.  Hold down the PUSH button. 
2.  Make adjustments to the damper position. 
3. Release 
the 
PUSH button. 
NOTE:  If there is no load, the actuator will hold the 
new damper position. If load conditions 
exist, the actuator might not be able to 
hold. 
Once power is restored, the actuator returns to 
automated control. 
 
EA0666R1
PUSH
PUSH
1
3
2
PUSH
L > 3 in.
      77mm
L < 3 in.
      77mm
3
2
PUSH
Figure 8.  Manual Override for Long and Short Damper 
Shafts. 
EA0686R1
1
2
Mechanical Range Adjustment 
The angular rotation is adjustable between 0° and 
90° at 5-degree intervals. 
1.  Loosen the shaft adapter from the damper shaft 
and remove the actuator from the damper shaft. 
2.  Remove the clip and shaft adapter from the 
actuator. See Figure 9. 
PUSH
 
Figure 9. 
3.  Return the actuator gear train to the "0" position 
using the steps which follow for the clockwise or 
counterclockwise damper shaft rotation. 
Clockwise-to-open: 
a.  Insert the shaft adapter to the right as close as 
possible to the raised stop. Figure 10. 
90
90
EA0674R1
PUSH
 
Figure 10.   
b.  Hold down the PUSH button and rotate the shaft 
adapter to the left until it stopsFigure 11. 
90
90
EA0675R1
PUSH
 
Figure 11. 
c. Release 
the 
PUSH button. 
d.  If the shaft adapter is not resting against the left 
raised stop, remove the adapter and insert it 
against the left stop.  
e.  Place the position indicator to the "0" position on 
the outside scale. Figure 12. 
Counterclockwise-to-open: 
a.  Insert the shaft adapter to the left as close as 
possible to the raised stop. 
b.  Hold down the PUSH button and rotate the shaft 
adapter to the right until it stops.  
c. Release 
the 
PUSH button. 
d.  If the shaft adapter is not resting against the 
right raised stop, remove the adapter and insert 
it against the right stop.  
e.  Place the position indicator to “0” on the inside 
scale. 
UL Doc. No. 129-272 
EAI/EN-4 
Dodge Engineering & Controls, Inc. 
Rev. 5, Jan., 2005