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)