Trane Precedent RT-PRC005 User Manual page 5

Standardized Components
•
Components are placed in the same
location on all Precedent™ units.
Familiarize yourself with one Precedent
and you are familiar with every
Precedent.
Easy Access Low Voltage Terminal Board
Precedent's Low Voltage Terminal Board
is external to the electrical control
cabinet. It is extremely easy to locate and
attach the thermostat wire. This is
another cost and time saving installation
feature.
Low Voltage Connections
The wiring of the low voltage connections
to the unit and the zone sensors is as
simple as 1-1, 2-2, and 3-3. This simplified
system makes it easy for the installer to
wire
Single-Side Service
Single-side service is standard on all
Precedent units.
Flexible Applications
• Only two roof curbs for the 3-10 ton
Precedent line. . .simplifies curb
selection.
•
Standard or High Efficiency Cooling
•
Electromechanical or ReliaTel
microprocessor controls to meet either
the simple or the more complex
application.
• Airflow is outstanding. The Precedent
can replace an older machine with old
ductwork and, in many cases, improve
comfort through better air distribution.
• Belt or direct drive — standard or
oversized supply fan motors meet a
wide airflow range.
• Precedent offers ultimate flexibility.
Options and components are not pre-
packaged at the factory. Units are built
to order in our standard "shortest in the
industry" ship cycle time.
RT -PRC005-EN
Features and
Benefits
Micro Controls
Several years ago, Trane was the first to
introduce microprocessor controls into
the Light Commercial Market. That
design, along with immeasurable
experience, has provided the technology
for Trane's second-generation ReliaTel™
microprocessor controls.
ReliaTel™ Micro:
• Provides unit control for heating,
cooling, and ventilating by utilizing input
from sensors that measure outdoor
and indoor temperature.
• Improves quality and reliability through
the use of time-tested microprocessor
controls and logic.
• Prevents the unit from short cycling,
considerably improving compressor
life.
• Ensures that the compressor will run for
a specific amount of time, which allows
oil to return for better lubrication,
enhancing the reliability of the
compressor.
• Reduces the number of components
required to operate the unit, thereby
reducing possibilities for component
failure.
• Eliminates the need for field-installed
components with its built-in anti-short-
cycle timer, time delay relay and
minimum ''on'' time controls. These
controls are factory tested to assure
proper operation.
• Requires no special tools to run the
Precedent unit through its paces during
testing. Simply place a jumper between
Test 1 and Test 2 terminals on the Low
Voltage Terminal Board and the unit will
walk through its operational steps. The
unit automatically returns control to the
zone sensor after stepping through the
test mode a single time, even if the
jumper is left on the unit.
• As long as the unit has power and the
LED is lit, the Micro is operational. The
light indicates that the Micro is
functioning properly.
• Features expanded diagnostic
capabilities when used with Trane's
TM
Integrated Comfort Systems.
• As an energy benefit, softens electrical
''spikes'' by staging on fans,
compressors and heaters.
• The Intelligent Fallback or Adaptive
Control is a benefit to the building
occupant. If a component goes astray,
the unit will continue to operate at
predetermined temperature set points.
• Intelligent Anticipation is a standard
feature of the Micro. Functioning
constantly, the Micro and zone sensors
work together in harmony, to provide
tight comfort control.
Electromechanical Controls
•
For the simpler job that does not
require a building automation system,
or expanded diagnostics capabilities,
Precedent offers electromechnical
controls. This 24-volt control includes
the control transformer, contactor
pressure lugs for power wiring.
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