Johnson Controls VA-9070 Series Technical Bulletin page 10

• one small wiring diagram sticker for the additional potentiometer
Tools Required
For terminal wiring: 3/16 in. (5 mm) blade screwdriver
For potentiometer mounting screws: No. 2 Phillips screwdriver
Installation Procedure
1. Install the potentiometer next to the camshaft, use the two threaded holes provided.
2. Mount the potentiometer in the correct orientation with its gear centered so that it meshes
with the potentiometer drive gear.
3. Push the assembly towards the cam to mesh the potentiometer gears, and tighten the
mounting screws.
Figure 8: Installing the Feedback Potentiometer
4. Move the wiring from the six-point strip to the new terminal strip, reconnecting the wiring in
the same positions.
5. Wire the potentiometer to the terminal strip using the small stick-on wiring diagram
provided.
6. Adhere the wiring diagram sticker to the inside of the cover.
Setting the Potentiometer
1. Manually operate the actuator handwheel until the unit is in the fully closed position.
2. Rotate the black potentiometer drive gear adjustment knob to barely engage the
potentiometer gear segment at the closed position.
3. Manually operate the actuator to the fully open position.
10 VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin