Catalogue

UV-PRC004-EN 13

Application Considerations

Wide Variety of Heating/Cooling Coils

Trane’s unit ventilator offers a wide variety of coil configurations.

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 heat fixed conditions.

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 structure.

Building Automation

As part of the building automation system, the mechanical HVAC system 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 serviceability faults 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. 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.

System choice for the classroom unit ventilator

AND/OR

CHILLER FOR

COOLING

BOILER

FOR HEAT ADD

CONDENSER

FOR COOLING

CLASSROOM UNIT VENTILATOR

UV-PRC004-EN.book Page 13 Monday, February 4, 2013 11:01 AM