Catalogue

10 UV-PRC003-EN
Application Considerations
A Choice in System Design
The beauty of the classroom unit ventilator goes beyond its ability to heat and cool. The unit
ventilator design provides an opportunity to create a comfortable atmosphere for living, learning
and playing, while supporting energy efficiency savings. Some of the featured benefits of a unit
ventilator are:
• Individual room control.
• Fresh air ventilation and filtration.
• Individual dehumidification sequences per zone.
• Energy savings solutions through economizing functions and Electronically Commutated
Motors.
• A choice in heating/cooling applied systems.
• And, because the equipment is mounted directly in the living space, expense associated to
installed mechanical ductwork may be avoided.
Wide Variety of Heating/Cooling Coils
Trane’s unit ventilator offers a wide variety of coil configurations to be used in many design
considerations.
In environments where cooling needs are of main interest, a two-pipe coil coupled with a chiller,
or a direct expansion coil joined with a condensing unit may be used.
For heat specific applications, Trane offers a two-pipe hot water only unit to be combined with a
boiler. Electric heat and steam options are also available for heating selections.
When there is seasonal heating and cooling, a two-pipe chilled water/hot water changeover system
may be applicable to the mechanical design. This system requires a chiller and a boiler to support
the changeover necessity. However, where space constraints may present a concern, the Trane unit
ventilator may be equipped with a direct expansion coil for cooling, with an auxiliary electric heat
coil, hot water coil, or steam coil for heating.
Four-pipe chilled water/hot water systems are also available. This system is typically applied when
both heating and cooling may be simultaneously called for in the school.
Building Automation
As part of the building automation system, the mechanical HVAC system equipment may be
optimized to lower energy consumption. By running only the mechanical devices that are required
to support the building load at a given time of day or night, true energy consumption savings may
be achieved.
Maintenance and service information through the unit sensing devices are easily defined and
cured with an automated system.
With factory shipped direct digital controls, installation and start-up of the system are more simple.
Condensate
Proper condensate trapping is required for the classroom unit ventilator’s with hydronic and direct
expansion coils (steam coils do not require a trapped condensate setup). In a properly trapped
system, when condensate forms during normal operation, the water level in the trap rises until
there is a constant flow of water through the pipe. It is imperative to maintain water in the trap, and
not allow the trap to dry out during heating season.
Equipment should be installed level to avoid condensate build-up around the coil.
Performance
Application of this product should be within the catalogs airflow and unit performance. The Trane
Official Product Selection System (TOPSS™) will aid in the selection process for a set of given
UV-PRC003-EN.book Page 10 Tuesday, June 4, 2013 8:59 PM