Tracer® ZN.520

Table 36. Valves Stay Closed

Probable Cause

Explanation

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 (valves are

 

closed).

Power up control wait

When power up control wait is enabled (non-zero time), the controller

 

remains off until one of two conditions occurs: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.

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 valve(s) may not be open.

 

Refer to the Manual Output Test section.

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 and

 

valves to close.

Sampling logic

The controller includes entering water temperature sampling logic which

 

is automatically invoked during 2-pipe and 4-pipe changeover when the

 

entering water temperature is either too cool or too hot for the desired

 

heating or cooling.Refer to the Entering Water Temperature Sampling

 

section.

Diagnostic present

A specific list of diagnostic affects valve operation. For more information,

 

see the Diagnostics section.

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.Example: A 2-

 

pipe heat/cool changeover unit will not cool if the entering water tempera

 

ture is too warm for cooling or if the entering water sensor is not present.

 

The unit will not heat if the entering water temperature is too cool for

 

heating.

Unit wiring

The wiring between the controller outputs and the valve(s) must be

 

present and correct for normal valve operation.

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.

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Trane LO manual Valves Stay Closed Probable Cause Explanation
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