Trane LO Tracer ZN.010 and ZN.510, Troubleshooting, Fan Outputs do not Energize, Probable Cause

Tracer® ZN.010

and ZN.510

Troubleshooting

Table 15. Fan Outputs do not Energize

Probable Cause	Explanation
Random start	After power-up, the controller always observes a random start that varies
observed	between 0 and 25 seconds. The controller remains off until the random start
	time expires.
Power-up control wait	When power-up control wait is enabled (non-zero time), the controller remains
	off until one of two conditions occurs:
	1. The controller exits power-up control wait once it receives communicated
	information.
	2. The controller exits power-up control wait once the power-up control wait
	time expires.
Cycling fan operation	When the fan mode switch is in the auto postion, the unit fan cycles off when
	there is no call for heating or cooling. The heating/cooling sources cycle on or
	off periodically with the unit fan to match the capacity according to pulse-width-
	modulation (PWM) logic.
Unoccupied operation	The fan cycles with capacity when the unit is in unoccupied mode. This occurs
	even if the unit is in continuous fan operation. While unoccupied, the fan cycles
	on or off with heating/cooling to provide varying amounts of heating or cooling to
	the space. to match the capacity according to pulse-width-modulation
	(PWM) logic.
Fan mode off	When using the local fan mode switch to determine the fan operation, the off
	position controls the unit fan to off.
Requested mode: off	It is possible to communicate the operating mode (such as off, heat, and
	cool) to the controller. When “off” is communicated to the controller, the unit
	controls the fan to off. The unit is not capable of heating or cooling when the
	controller is in this mode.
Diagnostic present	A specific list of diagnostics effects fan operation. For more information, see the
	“Diagnostics” section on page 50.
No power to the	If the controller does not have power, the unit fan will not operate. For the
controller	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 the controller has failed.
Manual output test	The controller includes a manual output test sequence to verify binary output
	operation and the associated wiring. However, based on the current step in the
	test sequence, the unit fan may not be powered on. Refer to the “Manual
	Output Test” section on page 51.
Unit wiring	The wiring between the controller outputs and the fan relays and contacts must
	be present and correct for normal fan operation. Refer to the typical unit wiring
	diagrams in the Appendix of this manual.

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