Xylem IM196 R01 Explosion Proof Wastewater Pumps Listed Class 1, Groups C and D Hazardous Locations - Manual (Page 5)

5
CHECK ROTATION
Always verify correct rotation. Correct rotation is indi-
cated 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 RO-
TATION ON ALL THREE PHASE MOTORS
CONNECTED TO THE PANEL.
NOTICE: MOTOR STARTUP TORQUE, "KICKBACK",
WILL CAUSE THE MOTOR TO TWIST
IN THE DIRECTION OPPOSITE RO-
TATION. INSURE THAT THE PUMP
ASSEMBLY IS ADEQUATELY RE-
STRAINED.
DO NOT PLACE HANDS IN PUMP
SUCTION WHILE CHECKING
MOTOR ROTATION. TO DO SO
WILL CAUSE SEVERE PERSONAL
INJURY.
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. Operating the pump off the curve, i.e. with too
little head or with high or low voltage will increase am-
perage. The motor will operate with frequency not more
than 5% and voltage not more than 10% above or below
pump nameplate data. Performance 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 un-
balance 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.
PANEL WIRING DIAGRAMS:
Control panels are shipped with instructions and wiring
diagrams. 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 Waste-
water 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 avail-
able. 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 Guar-
anteed Pump Submergence Circuit. This provides a sec-
ond 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 chang-
ing the 4 th digit in the number, all lengths are acceptable.
They 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 impel-
ler 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.
OPERATION
INSTALLATION
DANGER
Hazardous Machinery
!
FLOAT SWITCHES
CHECK ROTATION