Options For Optimum Building Comfort Control

• 100 percent modulating exhaust with forward-curved fans
• 100 percent modulating exhaust with FC fans and Statitrac™ direct space sensing building pressurization control
• High duct temperature thermostats
• 0 F low ambient control
• 0-100 percent modulating fresh air economizer
• Ultra low leak dampers for 0-100 percent modulating fresh air economizers
• Dual electrical power connection
• Two-inch spring fan isolation (20 through 75 ton)
• High efficiency motors
• U-frame motors
• Oversized motors
• Thru the door non-fused disconnect with external handle
• Electrical convenience outlet
• Power supply monitoring
• Correction capacitors
• Horizontal or Roof discharge w/gas heat (20-75 ton "F" style units only)

Field installed accessories

• Roof curbs
• Programmable sensors with night set back — CV and VAV
• Sensors without night set back — CV and VAV
• Remote zone sensors — used for remote sensing with remote panels.
• ICS zone sensors used with Tracer^® system for zone control
• Outdoor temperature sensor for units without economizers
• Remote minimum position control for economizer
• Field installed module kits available for field upgrade of controls

The modular control design of the UCM allows for greater application flexibility. Customers can order exactly what the job requires as options, instead of one large control package. Unit features are distributed among multiple field replaceable printed circuit boards. The Trane UCM can be set up to operate under one of three control applications:

1) stand-alone

2) interface with Trane’s Tracer® building management system

3) interface with a generic (non-Trane) building management system. All set-up parameters are preset from the factory, requiring less start-up time during installation.

The unit mounted Human Interface and the Remote Human Interface Panels’ functions are identical, except for the Service mode is not available on the Remote Human Interface Panel. This common interface feature requires less time for building maintenance personnel to learn to interact with the unit. All of the rooftop’s control parameters are adjustable and can be set up through the Remote Human Interface Panel such as, but not limited to: system on/off, demand limiting type, night setback setpoints, and many other setpoints. No potentiometers are required for setpoint adjustment, all adjustments are done through the Remote Human Interface key-pad. Also up to 48 different rooftop diagnostic points can be monitored through the human interfaces such as: sensor failures, loss of supply airflow, and compressor trip. No special tools are required for servicing of the unit. All diagnostic displays are available in clear English at the Remote Human Interface and will be held in memory, so that the operator/servicer can diagnose the root cause of failures.

Trane’s Statitrac™ control is a highly accurate and efficient method of maintaining building pressure control with a large rooftop air conditioner. The efficiency is achieved with a 100 percent modulating exhaust system with two forward-curved fans with modulating discharge dampers that operate only when needed, compared to some systems that operate continually. And most of the operating hours of the 100 percent modulating exhaust system are at part load, saving more energy. Trane’s Statitrac, with the 100 percent modulating exhaust system, provides comfort and economy for buildings with large rooftop air conditioning systems.

Statitrac control is simple! The space pressure control turns the exhaust fans on and off as required and modulates exhaust dampers to maintain space pressure within the space pressure dead band. Using the unit mounted Human Interface Panel you can

1) adjust space pressure setpoint

2) adjust space pressure dead band

3) measure and read building space pressure. The modulating exhaust system maintains the desired building pressure, saving energy while keeping the building at the right pressure. Proper building pressurization eliminates annoying door whistling, doors standing open, and odors from other zones.

The Statitrac™ direct space building control sequence will be maintained when a variable frequency drive is used.

Trane’s foward-curved fans with inlet guide vanes pre-rotate the air in the direction of the fan wheel, decreasing static pressure and horsepower, essentially unloading the fan wheel. The unloading characteristics of a Trane FC fan with inlet guide vanes result in superior part load performance.

Variable Frequency Drives are factory installed and tested to provide supply/ exhaust fan motor speed modulation. VFD’s, as compared to inlet guide vanes or discharge dampers, are quieter, more efficient, and are eligible for utility rebates. The VFD’s are available with or without a bypass option. Bypass control will simply  provide full nominal airflow in the event  of drive failure.