Tracer® ZN.010

and ZN.510

Table 19. Fresh Air Damper Stays Closed

Probable Cause

Explanation

Normal operation

The controller opens and closes the fresh air damper based on the controller’s

 

occupancy mode and fan status. Normally, the fresh air damper is open during

 

occupied mode when the fan is running and closed during unoccupied mode.

Warmup and cooldown

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” section on Page 51.

Diagnostic present

A specific list of diagnostics effects fresh air damper operation. For more

 

information, see the “Diagnostics” section on page 50.

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 fresh air damper does not operate. For

controller

the controller to operate normally, 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.

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 typical unit wiring

 

diagrams in the Appendix of this manual.

UNT-IOM-6

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Trane LO manual Fresh Air Damper Stays Closed Probable Cause Explanation

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