Tracer® ZN.010
and ZN.510
Table 18. Electric Heat Not Operating
Probable Cause | Explanation |
Normal operation | The controller cycles electric heat on and off to meet the unit capacity require- |
| ments. |
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 units shuts off |
| the electric heat. |
Communicated disable | Numerous communicated requests may disable electric heat, including an |
| auxiliary heat enable input and the heat/cool mode input. Depending on the |
| state of the communicated request, the unit may disable electric heat. |
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 electric heat may not be on. Refer to the |
| “Manual Output Test” section on page 51. |
Diagnostic present | A specific list of diagnostics affects electric heat operation. For more informa- |
| tion, 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 electric heat may not work properly. |
No power to the | If the controller does not have power, electric heat does not operate. For the |
controller | controller to operate normally, a 24VAC 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 electric heat contacts must |
| be present and correct for normal electric heat operation. Refer to the typical |
| unit wiring diagrams in the Appendix of this manual. |
56 |
