Electrical Requirements . Trane CVHE-SVX02M-EN, CVHG, CVHF, CVHE

Electrical Requirements

Installation Requirements

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Unit-mounted starters are available as an option on most units. While this option eliminates most fieldinstalled wiring requirements, the electrical contractor must still complete the electrical connection for the following:

• power supply wiring to the starter,

• other unit control options present, and

• any field-supplied control devices.

As you review this manual along with the wiring instructions presented in this section, keep in mind that:

• All field-installed wiring must conform to National

Electric Code (NEC) guidelines, and any applicable local, state, and national codes. Be sure to satisfy proper equipment grounding requirements per

NEC.

• Compressor motor and unit electrical data

(including motor kW, voltage utilization range, rated load amps, and locked rotor amps) is listed on the chiller nameplate.

• All field-installed wiring must be checked for proper terminations, and for possible shorts or grounds.

that shipped with the chiller or the unit submittal for specific as-built electrical schematic and connection information.

provide electrical access, exercise care to prevent debris from falling inside the enclosure. Refer to installation information shipped with the starter or submittal drawings.

Electrical Requirements

Before wiring begins, observe the following electrical requirements:

• Follow all lockout/tagout procedures prior to performing installation and/or service on the unit.

• Always wear appropriate personal protective equipment.

• Wait the required time to allow the capacitor(s) to discharge; this could be up to 30 minutes.

• Verify that all capacitors are discharged prior to service using a properly rated volt meter.

• Use appropriate capacitor discharge tool when necessary.

• Comply with the safety practices recommended in

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Do NOT modify or cut enclosure to provide electrical access. Removable panels have been provided, and any modification should be done away from the enclosure. If the starter enclosure must be cut to

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53

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Trane-supplied Starter Wiring

Table 15.

Standard field power wiring requirements

Power Supply Wiring to Starter Panel

3-Phase Line Voltage

Starter Panel

Terminals

2X3-L1, L2, L3, and Ground (a)

3-Phase Line Voltage: Circuit Breaker 2Q1-L1, L2, L3, and Ground

Starter to Motor Power Wiring

Remote Starter to Chiller Motor Junction Box

Starter to Control Panel

120 Vac Control Wiring

120 Vac Power Supply (from Starter to

Control Panel)

High Pressure Cutout to Starter

Starter

T1 through T6

Starter Panel

Terminals

2X1-1, 2X1-2

2X1-20 (Ground)

2X1-4

(c)

Motor

T1 through T6

Unit Control Panel

Terminations

1X1-1, 1X1-12

1X1-18 (Ground)

1X1-4

Max Terminal Wire

Size (AWG)

8

14

(b)

Minimum Circuit

Ampacity

40

20

1Q1 Circuit Breaker to Starter

1X1-3 14 20

Oil Pump Interlock 2X1-7, 2X1-8 1A7-J2-4, 1A7-J2-2

14

Low Voltage Circuits

Less Than 30 Vac

Starter Panel

Terminals

Unit Control Panel

Terminations

Standard Circuits

Inter-processor Communications (IPC)

Remote-Mounted (d)

2A1-J3-3-4, or

2X1-12 to 13 if Present (Do

NOT Ground Shield at Starter)

1A1-J5-1-2, 3-4

Shield Ground at

1X1-22 (GND) Only

2-wire with Gound

Comm Link

Notes:

1

.

All wiring to be in accordance with National Electrical Code (NEC) and any local codes.

2

.

Oil pump motor: 1 Ph, 3/4 HP, 11.7 full load amps at 115 Vac.

3

.

Auxiliary equipment must be powered from other sources as the chiller control panel power supplies are sized for the chiller loads only.

20

(a)

(b)

(c)

(d)

Ground lug for a unit-mounted solid state starter or wye-delta starter is sized to accept 14 AWG solid to 8 AWG strand wire. If local codes require different lug size, it must be field-supplied and -installed.

Wires, lugs, and fuses/breakers are sized based on National Electric Code NEC [NFPA 70] and UL 1995.

1Q1 Circuit Breaker to Starter connects to 2X16 Starter Panel Terminal for all starter types

except

the AFDG (Trane-supplied remote Danfoss AFD); for the

AFDG, 1Q1 Circuit Breaker to Starter connects to 2X13 Starter Panel Terminal.

Must be separated from 120 Vac and higher wiring.

Electrical Protection Package option): A unitmounted, factory-wired, separate enclosure positioned next to the control panel is available when separate source control power is required.

This permits the controls to remain powered while the three-phase line voltage is disconnected. Contact your local Trane representative for more information.

54 CVHE-SVX02M-EN