Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Manual de instalación descargar pdf (Pagina 27)

VRF-SVN33A-EN 27

Electrical Wiring

Grounding

Important: Grounding must be done by a qualified electrician. The unit cannot be ground by a

gas or water pipe, a lightning rod, or a telephone line grounding wire.

Ground the unit at an exclusive grounding terminal, at the electrical panel (see Figure 18), or—if

the power distribution circuit is not grounded or its grounding does not comply with electrical

codes and specifications—to a grounding rod.

Figure 18. Mini outdoor unit grounding examples

Installing a Grounding Rod

If the installation requires a grounding rod is required, follow this procedure:

1. Select a grounding rod that complies with national and local codes.

2. Select a location for the grounding rod that:

• Contains hard damp soil rather than loose sand or gravel.

• Is located away from underground structures such as gas and water pipes, telephone lines,

and underground cables.

• Is at least 6.6 ft (2 m) away from a lightning conductor.

3. Install the grounding rod in accordance with national and local codes.

4. Proceed with “Installing the Grounding Cable.”

Installing the Grounding Cable

1. Select rated grounding cable by referring to the mini outdoor unit power cable specifications

(Table 11, p. 25).

2. Connect the grounding cable to the grounding hole inside the power supply box and pull it

through the designated grounding knock-out.

Note: If the grounding cable length needs to be extended, make the cable connection in

accordance with national and local codes.

3. If a grounding rod was installed to ground the unit, measure the resistance with a ground

resistance tester. Refer to Table 13 for resistance requirements.

• If the resistance is above the requirements, drive the grounding rod deeper into the ground

or increase the number of grounding rods until the resistance requirement is achieved.

Grounded to exclusive

grounding terminal that

is part of the structure

Grounding at the

electrical panel

Grounded to grounding rod

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Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Manual de instalación Pagina 27