Trane Custom Climate Changer Air Handlers manual Wiring, Hazardous Voltage with, Capacitors

Installation

Wiring

Wiring to the unit fan motor must be provided by the installer and must comply with all national and local electrical codes. The installer must also furnish a fused disconnect switch in compliance with national and local electrical codes.

Fan motors also require motor overload protective devices that are rated or selected in compliance with the National Electric Code or

All direct-digital controllers (DDCs) are provided with line voltage to 24 Vac control transformers mounted and wired in the starter or variable-frequency drive (VFD) power box transformer plate (see Figure 41) or 120 to 24 Vac control transformers mounted and wired in the auxiliary control panel (see Figure 42).

Figure 42. Controller with power box attached

Figure 43 shows a typical VFD power box.

Note: The valve jack/junction box is typically located at the air-leaving side of the coil connection inside panel. For coils with headers on both sides of the module, the valve jack is located at the return connection for water coils and the supply connection for steam coils.

￿WARNING

Hazardous Voltage with

Canadian Electric Code. Specific unit and motor connection diagrams are provided on the starter/VFD, if Trane- provided, or refer to the motor nameplate.

CAUTION

Use Copper Conductors

Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors may result in equipment damage.

Figure 41. Transformer plate

24 Vac

Line supply 120 Vac

Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or

Figure 43. Variable-frequency drive (VFD)

Line supply to	24 Vac to end
transformers	devices and
	controllers

CAH-SVX01A-EN

serious injury.

To provide field-wiring to units with DDC controls:

•Provide 120 Vac power to a transformer in the junction box provided when a separate circuit is recommended (see Figure 42).

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

•For valve jack junction box mounting and wiring detail (see Figure 43).

CAUTION

Seal the Penetrations!

Seal all penetrations into the unit to prevent air infiltration during operation. Failure to do so may result in equipment damage.

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