Wiring Installation - North Star M459231B.1 Installation, Operation And Maintenance Manual

Condensation Discharge Piping. If installing a
condensation discharge line, the piping must be at
least one size larger than the connection, as short
and direct as possible, secured tightly and routed to
a suitable drain point. Condensation must be
disposed of in accordance with local, state, and
federal laws and regulations.
Model 459231
Top View - Pressure Switch
L2
00857
Electrical Service
Customer supplied wires
L1
Pressure
Switch
General. The motor rating, as shown on the motor
nameplate, and the power supply must have
compatible voltage, phase and hertz characteristics.
Wire Size. The electrical wiring between the power
supply and electric motor varies according to motor
horsepower. Power leads must be adequately sized
to protect against excessive voltage drop during
start-up. Information for selecting proper wire size
should be provided by a qualified electrician. If other
electrical equipment is connected to the same circuit,
the total electrical load must be considered in
selecting the proper wire size. Do not use undersized
wire.
NOTE: On units requiring a motor starter, connect
line power to the starter. DO NOT connect the line
power to the pressure switch.

Wiring Installation

L1
L2
Pressure
Switch
B1 R1
00865
M
Motor
WARNING! If an aftercooler, check valve, block
valve, or any other restriction is added to the
compressor discharge, install a properly sized ASME
approved safety/relief valve between the compressor
discharge and the restriction.
Model 459241
Side View - Motor Starter
Electrical Service
Customer supplied wires
L1 L2
R2
1A
FUSE
B2
Motor
Motor
Starter Starter
Contact Contact
R1
Motor
Starter
Overload
B1
00865
M
Motor
Magnetic Starter. If the motor installed on your
compressor has a motor reset button, it does not
require a magnetic starter. If the motor does not
have this button, connect the power leads to the
starter located under the compressor top plate.
Circuit Breaker. Refer to the National Electric
Code to determine the proper circuit breaker rating
required. When selecting a circuit breaker,
remember the momentary starting current of an
electric motor is greater than its full load current.
Time delay or "slow-blow" circuit breakers are
recommended.
WARNING! The installation should be made by a
qualified electrician. If the products must be
reconnected for use on different types of circuits,
the re-connection should be made by qualified
personnel.
5
B3 R5 R4
Motor
Pressure
Starter
Switch
Coil
L1
L2
R3
Motor
Starter
Overload