Tracer® ZN.010

and ZN.510

Table 18. Electric Heat Not Operating

Probable Cause

Explanation

Normal operation

The controller cycles electric heat on and off to meet the unit capacity require-

 

ments.

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” section on page 51.

Diagnostic present

A specific list of diagnostics affects electric heat operation. For more informa-

 

tion, 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 electric heat may not work properly.

No power to the

If the controller does not have power, electric heat does not operate. For the

controller

controller to operate normally, a 24VAC 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 electric heat contacts must

 

be present and correct for normal electric heat operation. Refer to the typical

 

unit wiring diagrams in the Appendix of this manual.

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UNT-IOM-6

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Trane LO manual Electric Heat Not Operating Probable Cause Explanation
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LO specifications

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