Tracer® ZN.520

 

 

Troubleshooting

 

 

 

Table 35. Fan outputs do not energize

Probable Cause

Explanation

Random start observed

After power up, the controller always observes a random start from zero

 

to 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 occur:The controller exits power

 

up control wait once it receives communicated information.The controller

 

exits power up control wait once the power up control wait time expires.

Cycling fan operation

The controller operates the fan continuously when in the occupied,

 

occupied standby, or occupied bypass mode. When the controller is in

 

the unoccupied mode, the fan is cycled between high speed and off with

 

capacity.

Unoccupied operation

When the controller is in the unoccupied mode, the fan is cycled

 

between high speed and off with capacity to maintain zone temperature

 

control.

Fan mode off

When a local fan mode switch (provided on the Trane zone sensor)

`

determines the fan operation, the off position controls the unit off.

Requested mode off

You can communicate a desired operating mode (such as off, heat,

 

and cool) to 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. For more information,

 

see the Diagnostics section.

No power to the

If the controller does not have power, the unit fan does not operate. For

controller

the Tracer® ZN.520 controller to operate normally, it must have an input

 

voltage of 24 VAC. When the green LED is off continuously, the control

 

ler 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. When the unit configuration does not match

 

the actual end devices, the valves may not work correctly.

Manual output test

The controller includes a manual output test sequence you can use

 

to verify 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 Test section.

Unit wiring

The wiring between the controller outputs and the fan relays and con

 

tacts must be present and correct for normal fan operation.

UNT-IOM-6

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Trane LO manual Fan outputs do not energize, Probable Cause Explanation

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