Tracer® ZN.010

and ZN.510

Table 16. Valves Stay Closed

Probable Cause

Explanation

Normal operation

The controller opens and closes the valves to meet the unit capacity require-

 

ments.

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.

Valve override

The controller can communicate a valve override request. This request effects

 

the valve operation.

Manual output test

The controller includes a manual output test sequence to verify analog and

 

binary output operation and the associated wiring. However, based on the

 

current step in the test sequence, the valves may not be open. Refer to the

 

“Manual Output Test” section on page 51.

Diagnostic present

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

 

the “Diagnostics” section on page 50.

Sampling logic

The controller includes entering water temperature sampling logic that

 

automatically invokes during 2-pipe or 4-pipe changeover. It determines when

 

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

 

heating or cooling mode. Refer to the “Entering Water Temperature Sampling”

 

section on page 41.

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.

No power to the

If the controller does not have power, the valves do 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.

Unit wiring

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

 

correct for normal valve operation. Refer to the typical unit wiring diagrams in the

 

Appendix of this manual.

54

UNT-IOM-6

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Trane LO manual Valves Stay Closed Probable Cause Explanation
Page 53 Page 55

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