Tracer® ZN.010
and ZN.510
Table 19. Fresh Air Damper Stays Closed
Probable Cause | Explanation |
Normal operation | The controller opens and closes the fresh air damper based on the controller’s |
| occupancy mode and fan status. Normally, the fresh air damper is open during |
| occupied mode when the fan is running and closed during unoccupied mode. |
Warmup and cooldown | The controller includes both a warmup and cooldown sequence to keep the |
| fresh air damper closed during the transition from unoccupied to occupied. This |
| is an attempt to bring the space under control as quickly as possible. |
Requested mode: off | It is possible to communicate the operating mode (such as off, heat, cool) |
| to the controller. When off is communicated to the controller, the unit closes the |
| fresh air damper. |
Manual output test | The controller includes a manual output test sequence that verifies analog and |
| binary output operation and associated output wiring. However, based on the |
| current step in the test sequence, the fresh air damper may not be open. Refer |
| to the “Manual Output Test” section on Page 51. |
Diagnostic present | A specific list of diagnostics effects fresh air damper operation. For more |
| information, see the “Diagnostics” section on page 50. |
Unit configuration | The controller must be properly configured based on the actual installed end |
| devices and application. When the unit configuration does not match the actual |
| end device, the damper may not work correctly. |
No power to the | If the controller does not have power, the fresh air damper does not operate. For |
controller | the controller to operate normally, a 24 VAC input voltage must be applied. |
| When the green LED is off continuously, the controller does not have sufficient |
| power or has failed. |
Unit wiring | The wiring between the controller outputs and the fresh air damper must be |
| present and correct for normal damper operation. Refer to the typical unit wiring |
| diagrams in the Appendix of this manual. |
57 |
