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Air
Compressors
Installation
(Cont.)
Recommended wire sizesmay be larger
than the minimum set up by localordi-
nances. If so, the larger size wire should
be used to prevent excessive line voltage
drop. The additional wire cost isvery
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
electrical components are]
_
I
shock hazards. Make sure I
_
J
all the components are
properly grounded to prevent 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
Pump
Discharge
Tube
-,,,,
Check Valve
\
Tank
Pressure
Gauge
Isolation
Pad
(available separately) •
/
Drain cock
Figure 2 - Typical Horizontal
Unit Identification
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 RS6HZ,Y56Y or
L143T include built-in overload protec-
tion. No additional protection
is
required. Use Figure 3 wiring diagram•
Motors with frame sizes 184T, 21 ST,
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 2301460
ratings:
I.
Rewire motor per data plate on
motor or instruction sheet.
2. Check electric rating of magnetic
starter and replace thermal overload
Safety Valve Access
Motor
Factory Mounted
J
Magnetic
(Not on
Starter
r
all units)
Pressure Switch
Tank Shut-off
Valve
(avaUabie separately)
Discharge Port
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 bythe 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 name-
plate.
Line
LINE
MOTOR
f_
._
PRESSURE
SWITCH
GROUND
--1-_
Single Phase
Wiring
Diagram
Ground
ii L3 (for 3 phasewiring only}
I 1.2
Circult Breaker
or
(_
L1
Fused Disconnect
I-i1_ .....
_-J
Single Phase/
Q1otc r_ Three
Phase
Wiring
Diagram
Wiring
Diagram
Figure 3 - For Motor Frame
Sizes RS6HZ,Y56Y or L143T.
Refer to Motor Nameplate
.........
_L1
'_-_
....
'_T2
Pres ure Sw tch
' X2
Over
'-
Load
Thermal
Units (3)
T1
J
Single Phase
, Motor',
Circuit
Breaker
or
?
_
Fused Disconnect
I- f-
--_z_
_y
I
I
:
L_ _L1 L_l
L3
Pressure
_
rnermal
Switch
t Units (3)
•
• T3
Three Phase
.'
Wiring
,,,Motor
Diagram
Figure 4 - For Motor
Frame Sizes 184T0 215T, 254T or 284T. Refer
to Motor
Nameplate
4
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