| Application-specific
Unit Control 
Application-specific controllers are designed to provide custom control
interfaces to specific types of equipment and
applications. This contrasts with the general purpose unit controllers, which provide
flexible control options for a variety of equipment.
Terminal Unit Controller
The Terminal Unit Controller (TUC) is a microprocessor-based direct digital
controller that can control a range of air conditioning
equipment including:
- Fan coils
- Unit ventilators
- Water source heat pumps
- Blower coil air handling units
ICS Capabilities
When linked to a Trane Tracer system, the TUC provides building operators
with centralized building management. Using a data communications link, you can connect
TUCs to Tracer Summit, Tracer l00i, or Tracer L panels.
These panels monitor the operation of TUC equipment and other unit controllers
which are part of a Trane building management system. Tracer systems provide centralized
control of equipment, including coordination of
setpoints and schedules.
Software Capabilities
TUCs use proportional integral derivative (PID) control algorithms specifically
developed for the equipment types listed above, to
provide accurate and reliable control operation.
The TUC is configurable to provide several different predefined control schemes, including 2-pipe or 4-pipe valve
control, face and bypass damper control, compressor
control, and economizer control. The TUC is configurable for different input
and output devices, such as 2-position, floating, or
modulating valves.
The TUC can be applied as a field-installed controller to retrofit existing
air conditioning equipment, including installation in
non-Trane equipment. The TUC is also available factory-installed, wired,
and tested in Trane air conditioning equipment.
Hardware Description
Two versions of the TUC are available for field installation:
- Standard ambient: NEMA
Type 1 resin enclosure (32° to 120° F, 0° to 49° C)
- Extended ambient: NEMA
Type 1 painted metal enclosure (-40° to 158° F,
-40° to 70° C)
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