4
Air Compressors
Recommended wire sizes may be larger
than the minimum set up by local ordi-
nances. If so, the larger size wire should
be used to prevent excessive line voltage
drop. The additional wire cost is very
small compared with the cost of repair-
ing or replacing a motor electrically
“starved” by the use of supply wires
which are too small.
GROUNDING
Improperly grounded
electrical components
are shock hazards.
Make sure all the com-
ponents are properly grounded to pre-
vent death or serious injury.
This product
must
be grounded.
Grounding reduces the risk of electrical
shock by providing an escape wire for
the electric current if short circuit
occurs. This product must be installed
and operated with a power cord or
cable that has a grounding wire.
MOTOR HOOKUP AND STARTER
INSTALLATION
Branch circuit protection must be provid-
ed as specified in the United States
National Electrical Code, Chapter 2,
“Wiring Design and Protection.” Article
210, using the applicable article “For
Motors and Motor Controllers,” (Article
430, Table 430-1 52).
IMPORTANT
: Overload protection is
required for all motors. Certain motors
have this protection built-in. To deter-
mine if a motor has built-in overload
protection, refer to the frame size on
the motor nameplate.
Motors with frame size R56HZ, Y56Y or
L143T include built-in overload protec-
tion. No additional protection is
required. Use Figure 3 wiring diagram.
Motors with frame sizes 184T, 215T,
254T or 284T DO NOT have built-in over-
load protection. A magnetic starter is
required. Use Figure 4 wiring diagram.
To change to the alternate voltage
on three phase motors with 230/460
ratings:
1. Rewire motor per data plate on
motor or instruction sheet.
2. Check electric rating of magnetic
starter and replace thermal overload
elements or magnetic starter as
required. The voltage and amperage
ratings are listed on the motor
nameplate.
DIRECTION OF ROTATION
NOTE:
Improper rotation will result in
reduced unit life.
The direction of rotation must be coun-
terclockwise (as shown by the arrow on
the flywheel) while facing the flywheel
side of the pump. The motor nameplate
will show wiring information for coun-
terclockwise rotation.
The proper direction is very important.
The direction of rotation of 3 phase
motors can be reversed by interchang-
ing any two motor-line leads. For single
phase motors, refer to the motor
nameplate.
Pressure Switch
Factory Mounted
Magnetic Starter
Discharge Port
Isolation Pad
Pressure
Gauge
Check Valve
Tank
Pump
Motor
Discharge
Tube
Safety Valve Access
Drain cock
Tank Shut-off
Valve
Figure 2 - Horizontal Unit Identification
Line
Ground
L2
L1
Figure 3 - For Motor Frame Sizes R56HZ,
Y56Y or L143T. Refer to Motor Nameplate
Motor
L1
L2
Pressure
Switch
Thermal
Units (3)
L3
T2
Circuit Breaker or
Fused Disconnect
X2
Motor
Over
Load
Coil
T3
T1
Three Phase
Wiring Diagram
L1
Pressure Switch
Thermal
Units (3)
L2
Circuit Breaker or
Fused Disconnect
Motor
Over
Load
Coil
T2
T1
X2
Figure 4 - For Motor Frame Sizes 184T, 215T, 254T or 284T. Refer to
Motor Nameplate
Single Phase/
Three Phase
Wiring Diagram
Single Phase
Wiring Diagram
L3 (for 3 phase wiring only)
Installation
(Con’t)
(Not on
all units)
(available separately)
(available separately)
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