Trane Direct Fired Make-Up Air Lista de partes descargar pdf (Pagina 6)

6 MUA-PRC007-EN

Application Considerations

The Need for Make-Up Air Units

When more air is exhausted from a building than is supplied by the mechanical systems, the

building is under a “negative” condition. Air will leak into the building through cracks, windows,

and doors.

• Make-up air units are typically used to compensate for air being exhausted from a building or

other structure.

• Application for closed systems such as ovens or paint booths (consult home office).

• For use as a door heater where outside air is heated and not prevented from infiltrating.

• The DFOA/DFIA can be used as an air handler, no burner section. Can also be used with DX,

electric, CW, HW and steam coils. Contact your Trane representative.

Outdoor Units

Outdoor make-up air units are the most common approach to relieving negative pressure inside

commercial and industrial facilities. All units offer the advantage of a full support system that is

watertight, provides a plenum for return air, and has easily accessible piping and electrical

connections.

When a negative condition exists:

• Flues and stacks may experience a backdraft and cause dangerous contaminants to remain in

the occupied space. In the case of flues, the products of combustion may condense and corrode

the equipment.

• Under negative conditions, the exhaust system sees a greater static pressure. The capacity of

each fan is reduced and this results in an inadequate removal of contaminants.

Figure 1. Application and various modular arrangements (DFIA only)

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Trane Direct Fired Make-Up Air Lista de partes Pagina 6