Terminal Unit

Control (TUC)

Table 48. Electric Heat Not Operating

Probable Cause

Explanation

Normal Operation

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

 

capacity requirements.

Unit Disabled

The TUC may be disabled via the shutdown mode on a Tracer®

 

system or if BIP1 is configured as external interlock.

Electric Heat Control: Disable

The electric heat may be disabled with the Tracer® system. To

 

enable the electric heat, the TUC electric heat control must be set

 

to the auto postion.

Maximum heating capacity of zero

The Tracer® may limit the maximum heating/cooling capacity of the

 

TUC from zero to 100%. When the maximum heating capacity is

 

zero, the electric heat is disabled.

Latching Diagnostic Present

A specific list of diagnostics affects electric heat operation. For

 

more information, see the “Diagnostics” section on page 73.

 

Latching diagnostics require a manual reset to restore normal unit

 

operation.

Autocycle Test

The controller includes an autocycle test sequence that verifies

 

analog and binary output operation and associated output wiring.

 

However, based on the current stage in the test sequence, the

 

electric heat may be disabled. Refer to the “Autocycle Test”

 

section on page 71.

Unit Configuration

The TUC cannot control the electric heat output if the unit is config-

 

ured for no electric heat. Also, if the electric heat type is incorrectly

 

configured (1 or 2 stage), the electric heat may not operate prop-

 

erly.

No Power to the TUC

The TUC requires 24 VAC power for the unit to operate properly.

Wiring

The wiring between the controller outputs and the electric heat must

 

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

 

the typical unit wiring diagrams on pages 105-106.

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Trane LO manual 112

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