Trane Tracer manual Questionable Unit Operation, Fan output does not energize, Nicated information

Troubleshooting

Questionable Unit

Operation

Table 13: Fan output does not energize

Probable Cause	Explanation
Random start observed.	After power up, the controller always observes a random start from 0 to 25
	seconds. The controller remains off until the random start time expires.
	When power up control wait is enabled (non-zero time), the controller remains
	off until one of two conditions occurs:
Power up control wait.	z The controller exits power up control wait once it receives commu-
	nicated information.
	z The controller exits power up control wait once the power up control
	wait time expires.
	When configured to cycle with capacity, normally the unit fan cycles off with
Cycling fan operation.	heating or cooling. The heating/cooling sources cycle on or off periodically with
	the unit fan to provide varying amounts of capacity to the space.
	Even when the controller is configured for continuous fan operation, the fan
Unoccupied operation.	normally cycles with capacity during unoccupied mode. While unoccupied, the
	fan cycles on or off with heating/cooling to provide varying amounts of heating
	or cooling to the space.
Fan mode off.	When a local fan mode switch determines the fan operation, the off position
	controls the unit fan off.
	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 controls the
	fan off. There is no heating or cooling.
Diagnostic present.	A specific list of diagnostics affects fan operation. See Diagnostics section on
	page 27.
	If the controller does not have power, the unit fan does not operate. For the
No power to the controller.	ZN510 controller to operate normally, it must have an input voltage of 24 VAC.
	When the green LED is off continuously, the controller does not have sufficient
	power or has failed.
Unit configuration.	The controller must be properly configured based on the actual installed end
	devices and application.
	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 unit fan may not be on. Refer to the manual output
	overrides on page 9.
Unit wiring.	The wiring between the controller outputs and the fan relays and contacts must
	be present and correct for normal fan operation.

24