Terminal Unit

Control (TUC)

Diagnostics

Table 43. TUC Controller Diagnostics

Diagnostic

Latching?

Fan

Valves

Elect. Heat

Damper

Dirty filter

Yes

No Action

No Action

No Action

No Action

 

 

 

 

 

 

Condensate

Yes

Off

Closed

Off

Closed

overflow

 

 

 

 

 

 

 

 

 

 

 

Supply fan

Yes

Off

Closed

Off

Closed

failure (if

 

 

 

 

 

configured as

 

 

 

 

 

alarm = yes)

 

 

 

 

 

 

 

 

 

 

 

Supply fan

Yes

No Action

No Action

No Action

No Action

failure (if

 

 

 

 

 

configured as

 

 

 

 

 

alarm = no)

 

 

 

 

 

 

 

 

 

 

 

Low coil

Yes

Off

Open

Off

Closed

entering air

 

 

 

 

 

temp

 

 

 

 

 

Notes:

1.Use a normally open hot water valve with the low coil entering air temperature sensor.

2.Use a normally closed chilled water valve with the condensate overflow sensor.

Resetting Diagnostics

There are five ways in which diagnostics are reset:

1.Using the zone sensor

2.Using Everyware™, Trane’s TUC service tool

3.By cycling power to the TUC

4.Through Tracer 100iä or 100Lä

5.Through Tracer Summit®

Using the Zone Sensor

Using

EverywareSoftware

Using the zone sensor’s fan mode switch to reset diagnostics, slide the fan mode switch to the off position. Then return the switch back to any position except off.

Connect to the communications terminal with a laptop computer loaded with Everywareä software. Log on and reset the diagnostics from the diagnostic page of the TUC configuration screens. To view the diagnostics prior to resetting, press the ENTER key while in the status section of the service summary screens.

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Trane LO manual Diagnostics, Using the Zone Sensor EverywareSoftware

LO specifications

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