Tracer® Uc400-B Controller - Trane UniTrane Installation, Operation And Maintenance Manual

Electric Heat with ZN010, ZN510, or ZN520 Controllers
Table 82. Electric heat not operating
Probable Cause
Hot water is present on a
changeover unit
Fresh Air Damper with ZN010, ZN510, or ZN520 Controllers
Table 83. Fresh air damper stays open
Probable Cause Explanation
The controller opens and closes the fresh air damper based on the controller's occupancy mode and fan status.
Normal operation Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied
mode.
The controller includes a manual output test sequence that verifies analog and binary output operation and associated
Manual output test output wiring. However, based on the current step in the test sequence, the fresh air damper may not be open. Refer
to
The controller must be properly configured based on the actual installed end devices and application. When the unit
Unit configuration
configuration does not match the actual end device, the damper may not work correctly.
The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper
Unit wiring
operation. Refer to the unit wiring diagrams on the unit.
Table 84. Fresh air damper stays closed
Probable Cause Explanation
The controller opens and closes the fresh air damper based on the controller's occupancy mode and fan status.
Normal operation Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied
mode.
The controller includes both a warmup and cooldown sequence to keep the fresh air damper closed during the
Warmup and cooldown
transition from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possible.
It is possible to communicate the operating mode (such as off, heat, cool) to the controller. When off is communicated
Requested mode: off
to the controller, the unit closes the fresh air damper.
The controller includes a manual output test sequence that verifies analog and binary output operation and associated
Manual output test output wiring. However, based on the current step in the test sequence, the fresh air damper may not be open. Refer
to
A specific list of diagnostics effects fresh air damper operation. For more information, see
Diagnostic present
Troubleshooting," page
The controller must be properly configured based on the actual installed end devices and application. When the unit
Unit configuration
configuration does not match the actual end device, the damper may not work correctly.
If the controller does not have power, the fresh air damper does not operate. For the controller to operate normally,
No power to the controller 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.
The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper
Unit wiring
operation. Refer to the unit wiring diagrams on the unit.
Tracer® UC400-B Controller
LED Activity
LEDs are located on the front of the Tracer
controller. The following table provides a description of
LED activity, an indication or troubleshooting tip for each,
and any related notes.
UNT-SVX07J-EN
Explanation
On units with changeover coil and electric heat, simultaneous operation of hydronic heat and electric heat is not
allowed.
"Manual Output Test," page 138.
"Manual Output Test," page 138.
130.
®
UC400-B
Diagnostics and Troubleshooting
"Diagnostics and
143