Terminal Unit

Control (TUC)

Table 50. Fresh Air Damper Open

Probable Cause

Explanation

Normal Operation

· The two-position fresh air damper opens under normal unit opera

 

tion during occupied mode and closes during unoccupied mode.

 

· Modulating analog and 3-wire floating point economizers open to

 

the minimum position (configurable) when the unit is occupied and

 

modulate to meet unit capacity requirements.

 

· If the minimum damper position is zero, the damper may close

 

for extended periods. During the unoccupied mode, the normal

 

fresh air damper position is closed.

Override Present

The fresh air damper may be overridden open by either the Tracer®

 

system or Everyware™ software. Whenever any override is active,

 

the TUC drives the fresh air damper closed, unless the damper is

 

concurrently overridden open.

Autocycle Test

The controller includes an autocycle test sequence that verifies

 

analog and binary output operation and associated output wiring.

 

However, the current test stage sequence may require the fresh

 

air damper may be open. Refer to the “Autocycle Test” section on

 

page 71.

Unit Configuration

The TUC cannot control fresh air damper outputs if the unit is

 

configured for no fresh air damper. Also, if the fresh air damper type

 

is incorrectly configured (on/off, modulating analog, or 3-wire

 

floating point), it may not operate properly.

Wiring

The wiring between the controller outputs and the fresh air damper

 

must be present and correct for normal damper operation. Refer to

 

the typical unit wiring diagrams on pages 105-106.

Table 51. Zone Temperature Too Warm

 

Probable Cause

Explanation

 

Active heating/cooling

Verify that the active heating/cooling setpoints are reasonable. It is

setpoints

possible for either the zone sensor or for the Tracer® system to

 

send heating and cooling setpoints to the TUC. Use the Tracer®

 

system or Everyware™ software to determine which source is

 

sending the setpoint.

Wiring

Verify the wiring of all end devices, such as valves and dampers.

 

Use the manual overrides or the autocycle test to verify the end

 

device operation.

Manual heat mode

If the Tracer® system places the TUC in manual heat mode, the TUC

sent by Tracer®

cannot switch to cool mode and therefore cannot provide cooling to

 

the zone.

Zone sensor location

Locate the zone sensor in an area where the temperature is repre-

 

sentative of the average zone temperature.

 

114

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Trane LO manual Fresh Air Damper Open Probable Cause Explanation, Zone Temperature Too Warm Probable Cause Explanation
Page 113 Page 115

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