Trane BCHC, BCVC Valves stay open, Electric heat not operating, Fresh air damper stays closed

	Diagnostics
Table 45. Valves stay open
Probable cause	Explanation
Normal operation	The controller opens and closes the valves to meet the unit capacity requirements.
Valve override	The controller can communicate a valve override request to affect the valve operation.
Manual output test	The controller includes a manual output test sequence that verifies analog and binary output operation and the
	associated wiring. However, based on the current step in the test sequence, the valves may be open. Refer to the
	“Manual Output Test,” p. 73.
Diagnostic present	A specific list of diagnostics affects valve operation. For more information, see Table 41, p. 77 and Table 42, p. 77.
Sampling logic	The controller includes entering water temperature sampling logic that automatically invokes during 2-pipe or 4-pipe
	changeover to determine if the entering water temperature is correct for the unit operating mode. Refer to “Entering
	Water Temperature Sampling Function,” p. 55.
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 valves may not work correctly.
Unit wiring	The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation.
	Refer to the unit wiring diagrams on the unit.
Table 46. Electric heat not operating
Probable cause	Explanation
Normal operation	The controller cycles electric heat on and off to meet the unit capacity requirements.
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,” p. 73.
Diagnostic present	A specific list of diagnostics affects electric heat operation. For more information, see Table 41, p. 77 and Table 42,
	p. 77.
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, the unit fan does not operate. For the Tracer™ ZN010, 510 controller to operate
controller	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 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 unit wiring diagrams on the unit.
Table 47. Fresh air damper stays closed
Probable cause	Explanation
Warm-up and cool-down	The controller includes both a warmup and cooldown sequence to keep the fresh air damper closed during the transition
	from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possible.
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 unit closes the fresh air damper.
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 fresh air damper may not be open. Refer
	to the “Manual Output Test,” p. 73.
Diagnostic present	A specific list of diagnostics effects fresh air damper operation. For more information, see Table 41, p. 77 and Table 42,
	p. 77.
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 damper may not work correctly.
No power to the	If the controller does not have power, the unit fan does not operate. For the Tracer™ ZN010, 510 controller to operate
controller	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 wiring	The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper
	operation. Refer to the unit wiring diagrams on the unit.

BCXC-SVX01B-EN 79