Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 71)

CAH-SVX01B-EN 71

Installation - Electrical

NOTICE

Penetration Leaks!

Properly seal all penetrations in unit casing. Failure to seal penetrations from inner panel to

outer panel may result in unconditioned air entering the unit, and water infiltrating the

insulation, resulting in equipment damage.

All units with starters or variable-frequency drives (VFDs) that have direct-digital controllers (DDCs)

are provided with line voltage to 120 Vac power transformers (see Figure 67) with power 120 Vac

to 24 Vac control transformers (see Figure 68). Figure 69 shows a typical VFD power box.

To provide field-wiring to units with DDC or low limit controls:

• If VFD or starter is not factory-mounted, provide 120 Vac power to a transformer in the valve jack

when a separate circuit is recommended (see Figure 68).

• Install outside-air sensor and space sensor, if ordered.

• For valve jack mounting and wiring detail, see Figure 70.

Note: The valve jack is typically located at the air-leaving side of the coil connection inside panel.

For coils with headers on both sides of the unit, the valve jack is located at the return

connection for water coils and the supply connection for steam coils.

Figure 67. Transformer plate

Figure 68. 120 to 24 Vac Control

Transformer

Figure 69. Variable-frequency drive

(VFD)

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Trane Performance Air Handlers Manual de instalación Pagina 71