Trane Tracer, ZN510 Controller manual Outdoor air damper stays closed

Troubleshooting

Questionable Unit

Operation

Table 16: Outdoor air damper stays closed

Probable Cause	Explanation
	The controller opens and closes the outdoor air damper based on the controller’s
Normal operation.	occupancy mode and fan status. Normally, the outdoor air damper is open
	during occupied mode when the fan is running and closed during unoccupied
	mode. Refer to the outdoor air damper section on page 8.
	The controller includes both a morning warm-up and cool down sequence to
Warm up and cool down.	keep the outdoor air damper closed during the transition from unoccupied to
	occupied. This is an attempt to bring the space under control as quickly as
	possible.
	The desired operating mode (such as off, heat and cool) can be communicated to
Requested mode off.	the controller. When off is communicated to the controller, the unit closes the
	outside air damper.
	The controller includes a manual output test sequence that may be used to verify
Manual output test.	output operation and associated output wiring. However, based on the current
	step in the test sequence, the outdoor air damper may not be open. Refer to the
	manual output overrides on page 9.
	A specific list o f diagnostics affects outdoor air damper operation, depending
Diagnostic present.	whether the unit is configured as heat pump. For more information, see the
	Diagnostics section on page 27.
	The controller must be properly configured based on the actual installed end
Unit configuration.	devices and application. When the unit configuration does not match the actual
	end device, the outdoor air damper may not work correctly.
	If the controller does not have power, the compressor does not operate. For the
No power to the controller.	ZN510 controller to operate normally, a voltage input of 24 VAC 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 outdoor air damper must be
	present and correct for normal outdoor air damper operation.

26