127
Intake Damper Motor Assembly (MT-06)
1. Verify the wiring is correct.
2. Check the wiring for open or short circuits.
3. Verify the positive signal from J18 pin 2 is connected to the assembly at pin 3.
4. Verify the negative signal from J18 pin 9 is connected to the assembly at pin 1.
5. Test the damper rotation. Turn the unit ON. Use the HMI to monitor the movement of the damper.
• User Settings > Outdoor Air Voltage > 10V (default).
• Adjust the voltage setting and monitor the damper movement.
- If the damper movement and voltage reading are correct, test is complete.
- If the damper movement and voltage reading are incorrect, continue to the next step.
6. Check transformer voltages.
- If there is an issue with the transformer or wiring, repair or replace.
- If the transformer check is good, check for mechanical failures.
Field installation/adjustment
1. Rotate the damper shaft to its fail-safe position (closed). Mount the actuator with the counterclockwise
.
2. If the universal clamp is not on the correct side of the actuator, move it to the correct side.
3. Slide the actuator onto the shaft. Position the clamp so that the pointer of the tab is at the top of the
rotation.
4. Lock the clamp to the actuator using the retaining clip.
5. Tighten the nuts on the V-bolt. Torque to
6-8 ft-lb
.
6. Secure to strap.
7. Make sure the rotation is set correctly. Y = 0 set to CCW.
8. Test the spring return damper rotation.
• You can use the crank handle to test manually.
• Turn the unit ON. Use the HMI to monitor the movement of the damper.
• Service > Test Menu > Test Misc > Outdoor Air
• Adjust the voltage setting and monitor the damper movement.
0V – Outdoor air dampers closed
;
10V – Outdoor air dampers open
.
- If the damper operates properly, the installation is correct.
- If the damper operates incorrectly, adjust as required. If adjustment cannot be made, check the
wiring is correct. Verify to the unit’s wiring schematics.
Figure 64 - Intake Damper Motor Assembly
CCW
CCW
.2
.8
CCW CW
35° ... 95°
9
