Float Switches; Installation; Check Rotation; Operation - Xylem Bell & Gossett Explosion Proof 3XWC Directives D'installation, D'utilisation Et D'entretien

PANEL WIRING DIAGRAMS:
Control panels are shipped with instructions and wiring dia-
grams. Use those instructions in conjunction with this IOM.
Electrical installation should be performed only by qualified
technicians.
ALARMS:
We recommend the installation of an alarm on all Wastewa-
ter pump installations. Many standard control panels come
equipped with alarm circuits. If a control panel is not used,
a stand alone high liquid level alarm is available. The alarm
alerts the owner of a high liquid level in the system so they
can contact the appropriate service personnel to investigate
the situation.
OPTIONAL PANEL FEATURES:
Guaranteed Pump Submergence Float: Many engineers
specify a redundant OFF float, also referred to as a Guaran-
teed Pump Submergence Circuit. This provides a second
OFF float as protection from "OFF" float failure or hang up
which protects the pump(s) from running dry.

FLOAT SWITCHES

We recommend using a narrow angle hermetically sealed
mercury float switch such as Model Number A2K23(W)
or an equivalent in Class 1 hazardous environments. The
A2K23(W) can be ordered with longer cords by changing
the 4 digit in the number, all lengths are acceptable. They
th
are designed for use with Intrinsically Safe Relays.
OFF Float: Should be set at or above the top of the pump/
motor dome. This will insure that the motor is properly
cooled and provide the best overall pump life. The pump
should be fully submerged when running. The outer (lower)
shaft seal must be in liquid when motor is operated, whether
motor is submerged or in air. Seal life will be affected if run
dry. Exception: it is allowable to bump or jog the motor for a
few seconds to check impeller rotation! See Motor Manual
under Application.
Guaranteed Pump Submergence Float: When used this
should be the lowest float. Set a few inches below the other
OFF Float.
ON Float(s): Should be set far enough above the highest
OFF Float to allow the pump(s) to run for a 2 minute cycle.
Alarm Float: Set above the ON float(s) and below the basin
inlet.
See Float Switch and Panel Chart.

INSTALLATION

Connect the pump(s) to the guide rail pump adapters or to
the discharge piping.
Guide rail bases should be anchored to the wetwell floor.
Complete all wiring per the Motor Manual, Control Panel
wiring diagrams and NEC, Canadian, state,
provincial and/or local codes.
This a good time to check for proper rotation of the
motors/impellers.

CHECK ROTATION

Always verify correct rotation. Correct rotation is indicated on
the pump casing. Both three phase and single phase motors
in this series are reversible. It is allowable to bump or jog
the motor for a few seconds to check impeller rotation. It is
easier to check rotation before installing the pump.
See the Motor Manual for Instructions to Change Rotation.
Lower the pump(s) into the wetwell.
Check to insure that the floats will operate freely and not
contact the piping.
NOTICE: DO NOT SWITCH PRIMARY POWER LEADS
COMING INTO ANY THREE PHASE PANEL,
THIS WILL REVERSE ROTATION ON ALL THREE
PHASE MOTORS CONNECTED TO THE PANEL.
NOTICE: MOTOR STARTUP TORQUE, "KICKBACK", WILL
CAUSE THE MOTOR TO TWIST IN THE DIREC-
TION OPPOSITE ROTATION. INSURE THAT THE
PUMP ASSEMBLY IS ADEQUATELY RESTRAINED.
DO NOT PLACE HANDS IN PUMP
DANGER
!
SUCTION WHILE CHECKING
ROTATION. TO DO SO WILL CAUSE
SEVERE PERSONAL INJURY.
Hazardous Machinery

OPERATION

Fill the wetwell with clear water.
Place Control Panel switch(es) in Automatic position and
thoroughly test the operation of the ON, OFF, Alarm and,
where used, the Guaranteed Pump Submergence Floats.
Important: Failure to provide a Neutral from the power
supply to a 1Ø Control Panel will not allow the panel control
circuit to operate. The Neutral is necessary to complete the
115 volt control circuit.
Check voltage and amperage and record data on the front
of this manual for future reference. Compare the amperage
readings to the pump nameplate maximum amperage. If
higher than nameplate amperage investigate cause. Operat-
ing the pump off the curve, i.e. with too little head or with
high or low voltage will increase amperage. The motor will
operate with frequency not more than 5% and voltage not
more than 10% above or below pump nameplate data. Per-
formance within this range will not necessarily be the same
as the published performance at the exact rated nameplate
frequency and voltage.
Correct the problem before proceeding. Three phase unbal-
ance is also a possible cause. See the Section on Three Phase
Power Unbalance and follow the instructions listed.
Reset the Alarm circuit, place pump switch(es) in the Au-
tomatic position and Control Switch in ON position. The
system is now ready for automatic operation.
Explain the operation of the pumps, controls and alarms to
the end user. Leave the paperwork with the owner or at the
control panel if in a dry, secure location.
MOTOR
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