Trane SCXG-SVX01B-EN manual Unit Wiring Diagrams, Supply PowerWiring, Live Electrical Components

Electrical Requirements

Unit Wiring Diagrams

￿WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

Specific unit wiring diagrams are provided on the inside of the control panel door. Use these diagrams for connections or trouble analysis.

Supply PowerWiring

￿WARNING

HazardousVoltage w/Capacitors!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout proce- dures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided byTrane 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 serious injury.

Note: For additional information regard- ing the safe discharge of capacitors, see PROD-SVB06A-EN or PROD-SVB06A-FR.

It is the installer’s responsibility to provide power supply wiring to the unit terminal block or the non-fused disconnect switch option.Wiring should conform to NEC and all applicable code

requirements.

Bring supply wiring through the knockout in the lower left side of the unit control panel. Connect the three phase wires to the power terminal block or the non- fused disconnect switch in the control box terminals. Refer to specific wiring diagrams and fuse information in the unit’s control panel.

NOTICE

Use Copper Conductors Only!

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

NOTICE

Equipment Damage!

Correct phase sequence is critical. If phase sequence of the incoming line voltage is not correct, it may result in motor damage.

Voltage Range

Voltages must be within +- 10% the nameplate voltage. Ensure the unit voltage is balanced by measuring at the compressor terminals.Voltage imbalance on three phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0%.

Voltage Imbalance

Read the voltage at the compressor terminals to determine if it is balanced. Voltage imbalance on three phase systems can cause motor overheating and premature failure.The maximum allowable imbalance is 2.0%.Voltage imbalance is defined as 100 times the sum of the deviation of the three voltages from the average (without regard to sign) divided by the average voltage. For example, if the three measured voltages are 221, 230, and 227, the average voltage would be:

(221 + 230 + 227) = 226 volts

3

The percentage of voltage imbalance is then:

100 * (226-221) = 2.2%

226

Control Power

NOTICE

Component Failures!

Unit transformers IT1, IT3, 1T4, and IT5 are sized to provide power to the unit only. Do not use these transformers to supply power to field equipment. Field connections to these transformers may create immediate or premature compo- nent failures.

In this example, 2.2% imbalance is not acceptable.Whenever a voltage imbalance of more than 2.0% exists, check the voltage at the unit disconnect switch. If the imbalance at the unit disconnect switch does not exceed 2.0%, faulty unit wiring is causing the imbalance. Conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.

Access the connection terminal block through the control panel on the unit’s upper left side. All wiring should conform to NEC and applicable local code require- ments.

Be sure all wiring connections are secure. Reference the unit specific diagrams inside the control panel.

SCXG-SVX01B-EN 33