Electrical Preparation- Supervisor; Motor Rotation Direction Check- Standard Electro-Mechanical; Motor Rotation Direction Check- Supervisor - Sullair LS20 Operator's Manual And Parts List

4. "DRY RUN" the electrical controls by disconnect-
ing the three (3) motor leads from the starter.
Energize the control circuits by pressing the "I"
START push button and check all protective
devices to be sure that they will de-energize the
starter coil when tripped.
5. Reconnect the motor leads and jog the motor for
a direction of rotation check as explained in
Section 4.8.
Wiring diagram for standard compressors is sup-
plied on the inside cover of the Control Center.
Optional compressor wiring diagrams will vary.

4.7 ELECTRICAL PREPARATION- SUPERVISOR

Interior electrical wiring is performed at the factory.
Required customer wiring is minimal, but should be
done by a qualified electrician in compliance with
OSHA, National Electric Code and/or any applica-
ble local electrical code concerning isolation switch-
es, fused disconnects, etc. Sullair provides a wiring
diagram for use by the installer.
An electrical check should be made to help assure
that the first start-up will be trouble-free.
Lethal shock hazard inside. Disconnect all power
at source, before opening or servicing.
1. Check incoming voltage. Be sure that the incom-
ing voltage is the same voltage that the com-
pressor was wired for.
2. Check starter and overload heater sizes.
3. Check all electrical connections for tightness.
4. "DRY RUN" the electrical controls by disconnect-
ing the three (3) motor leads from the starter.
Energize the control circuits by pushing the "I"
(START) pad and check all protective devices to
be sure that they will de-energize the starter coil
when tripped.
5. Reconnect the three (3) motor leads and jog the
motor for a direction of rotation check, as
explained in Section 4.9.
4.8 MOTOR ROTATION DIRECTION CHECK- STAN-
DARD ELECTRO-MECHANICAL
Motor rotation check must be made at compressor
start-up. Remove compressor panel as needed to
view motor rotation.
After the electrical wiring has been done, it is nec-
essary to check the direction of the motor rotation.
This can be accomplished by toggling between the
"I" (START) and "O" (STOP) push buttons on the
control panel. Verify proper rotation by observing
the motor shaft during start-up. The shaft should
rotate in the same direction as indicated by the rota-
tion decal located on the motor adapter. If the motor
shaft is not turning in the proper direction, discon-
nect power to the compressor and exchange any
two of the three power-input leads, then recheck
rotation.
An alternative to this procedure is to monitor the
sump pressure gauge when pressing the "I"
(START) push button.
shown on the sump pressure gauge when the com-
pressor is started, then the proper motor rotation
has been achieved. If no pressure is indicated,
press the "O" (STOP) push button immediately.
This indicates improper motor rotation. Disconnect
the power to the starter and exchange any two of
the three power input leads. Recheck rotation as
outlined above.
4.9 MOTOR ROTATION DIRECTION CHECK-
SUPERVISOR
Motor rotation check must be made at compressor
start-up. Remove compressor panel as needed to
view motor rotation.
After the electrical wiring has been done, it is nec-
essary to check the direction of the motor rotation.
Pull out the EMERGENCY STOP button and press
once, quickly and in succession, the "I" (START)
and "O" (STOP) pads. This action will bump start
the motor for a very short time. Verify proper rota-
tion by observing the motor shaft during start-up.
The shaft should rotate in the same direction as
indicated by the rotation decal located on the motor
adapter. If the motor shaft is not turning in the prop-
er direction, disconnect power to the compressor
and exchange any two of the three power-input
leads, then recheck rotation.
An alternative to this procedure is to set the
Supervisor to display P1.
GENCY STOP button and press once, quickly and
in succession, the "I" (START) and "O" (STOP)
pads. This action will bump start the motor for a
very short time. If motor rotation is correct there will
be immediate pressure shown. If no pressure is
present, reverse rotation is occurring. Disconnect
the power to the starter and exchange any two of
the three power input leads. Recheck rotation as
outlined above.
Section 4
INSTALLATION
If immediate pressure is
Pull out the EMER-
21