Ingersoll Rand VTR20 Manuel De Maintenance page 10

ELECTRIAL POWER SUPPLY
It is essential that the power supply and the supply wiring are adequately sized and the voltage
corresponds to the unit specifications. Branch circuit protection must be provided at installation
as specified in the National Electrical Code.
All wiring should be performed by a licensed electrician or electrical contractor. Wiring must meet
applicable codes for area of installation. The table gives recommended wire sizes based on the
1999 NEC.
COPPER CONDUCTOR – 75°C TEMP. RATING – 30°AMBIENT
MOTOR
HP 200/208V
7-1/2 8 (6)
10 8 (4)
15 6 (2)
Values in ( ) are for duplex unit with one incoming power line to both motors.
All models require a properly sized magnetic starter as specified in the National Electric Code
(NEC). See Figure 1-2 for simplex wiring diagram and Figure 1-3 for duplex wiring diagram. A
terminal strip is furnished with each unit. The hourmeter and solenoid valve(s) are pre-wired to
the terminal strip. It will be necessary to make connections from this terminal strip to the starter
as shown.
If ordered with a factory mounted magnetic starter, unit is wired at factory. It is necessary only to
bring lines from a properly sized disconnect switch to the magnetic starter mounted on the unit.
Wiring must be such that when viewing compressor from opposite shaft end, rotation of shaft is
clockwise as shown by arrow on guard. Wrong direction of rotation for any length of time will
result in damage to compressor.
WIRE SIZE (AWG)
3 PHASE
230V 460V
10 (6) 14 (10) 14 (10)
8 (4) 12 (8) 14 (10)
6 (3) 10 (6)
IF3163 Rev A Page 10
1 PHASE
575V 115V
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10 (8) --
208V 230V
6 (3) 6 (4)
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