SECTION 4
®SULLAIR®
28
3700 Operator’s Manual and Parts List
1. Check incoming voltage. Be sure that compressor is
wired for the correct incoming voltage.
2. Check the motor starter for correct size, properly
sized overload relay, and correct heaters for the
load.
3. Check all electrical connections for tightness. Check
all grounding connection for bond.
4. “DRY RUN” the electrical controls by disconnecting
the three (3) motor leads from the starter. Energize
the control circuits by pressing 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 motor leads and jog the motor for a
direction of rotation check as explained in Section
4.7. Wiring diagram for standard compressors is
supplied with the machine.
4.7 MOTOR ROTATION DIRECTION
CHECK
Motor rotation check must be made at compressor start-
up. The compressor will not operate correctly if it runs in
the wrong direction. Open the compressor door to view
the motor rotation. After the electrical wiring has been
done, it is necessary 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. When looking at the motor
from the end opposite the compressor unit, the shaft
should be turning clockwise. If the reversed rotation is
noted, disconnect the power to the starter and exchange
any two of the three power input leads, then re-check
rotation. A “Direction of Rotation” decal is located on the
motor to show proper motor/compressor rotation. An
alternative to this procedure is to set the Microprocessor
to display P1 sump pressure. 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. 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.
4.8 FAN MOTOR ROTATION CHECK
On initial start-up check that the fan is rotating in the
proper direction. The correct rotation is counterclockwise
when viewing the fan motor from the driveshaft end.
A DANGER
Lethal shock hazards exist inside.
Disconnect all power at source and lock
out before opening or servicing.
SU_0000034
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