Grundfos EB 20501-5, Owner'S Manual Installation And Operating Instructions

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5
English (US)
voltage and phase of the motors. Verify that the starters are
suitable to operate the pump motors on voltage and phase that is
available.
4. Operation
4.1 Priming
The Grundfos Type EB pump is not self-priming, and must be
completely primed (filled with liquid) before starting. If the pump
will operate with a positive suction head, prime by opening the
suction valve and allowing liquid to enter the pump casing. Open
the air vent at this time and make sure all air is forced from the
pump by liquid before closing. If the pump has suction lift, priming
must be accomplished by other methods. The use of foot valves,
ejectors or vacuum pumps, or by manual filling of the pump
casing and suction line with liquid are possible methods
suggested for this purpose.
4.2 Pre-start checklist
Make the following inspections before starting your Grundfos EB
pump:
1. Make sure all wiring connections to the motor (and starting
device) match the wiring diagram and produce clockwise
rotation as viewed from the back of the motor.
2. Double check rotation. Rotation must be clockwise. Operating
in reverse will destroy the impeller and shaft.
3. If the motor has been in storage for an extended length of
time, either before or after installation, refer to motor
instructions before starting.
4. Check the voltage, phase, and line circuit frequency with the
motor nameplate.
5. Tighten plugs in gauge and drain taps. If the pump is fitted
with pressure gauges, keep gauge clocks closed when not in
use.
6. Check suction and discharge piping for leaks, and make sure
all flange bolts are securely tightened.
4.3 Motor rotation
After the unit has been wired and checked to insure that all
components in the system (disconnect device, magnetic starters,
pilot devices and motors) are properly connected, check motor
rotation as follows: For 3 phase units only—momentarily energize
the motors to ensure that the rotation is correct as indicated by
the arrow cast into the pump volute. If rotation is incorrect,
interchange two wires at the motor starter terminals T1 and T2.
IMPORTANT: The pumps must not be operated while dry. Use
extreme caution that motors are energized only momentarily to
determine proper rotation.
4.4 Starting the pump
1. Fully open gate valve (if any) in suction line, and close gate
valve in discharge line.
2. Fill suction line with liquid and completely prime pump.
3. Start the motor (pump).
4. Immediately make a visual check of pump and suction piping
for pressure leaks.
5. Immediately after pump reaches full operating speed, slowly
open the discharge gate valve until complete system flow is
achieved.
6. Check discharge piping for pressure leaks.
7. If pump is fitted with pressure gauges, open gauge cocks and
record pressure reading for future reference. Verify that the
pump is performing in accordance with parameters specified
on performance curve.
8. Check and record voltage, amperage per phase, and
kilowatts, if a wattmeter is available.
4.5 Voltage regulation
The motor will operate satisfactorily under the following
conditions for voltage and frequency variation, but not necessarily
in accordance with the standards established for operation under
rated conditions: The voltage variation may not exceed 10%
above or below rating specified on the motor data plate. The
frequency variation may not exceed 5% above or below motor
rating. The sum of the voltage and frequency variations may not
exceed 10% above or below motor rating, provided the frequency
variation does not exceed 5%.
4.6 Pump shutdown
The following shutdown procedures will apply in most normal
shutdowns for the Grundfos Type EB pumps. If the pump will be
inoperative for an extended length of time, follow storage
procedures in Extended Period Shutdown. Always close the
discharge valve before stopping the pump. Close the valve slowly
to prevent hydraulic shock. Cut and lock off power to the motor.
4.7 Short duration shutdown
For overnight or temporary shutdown periods under non-freezing
conditions, the pump may remain filled with liquid. Make sure the
pump is fully primed before restarting.
For short or frequent shutdown periods under freezing conditions,
keep fluid moving within the pump casing and insulate or heat the
pump exterior to prevent freezing.
4.8 Extended period shutdown
For long shutdown periods, or to isolate the pump for
maintenance, close suction gate valve. If no suction valve is used
and the pump has positive suction head, drain all liquid from
suction line to terminate liquid flow into pump suction nozzle.
Remove plugs in pump drain and vent taps, as required, and
drain all liquid from the pump volute casing. If freezing conditions
will exist during long shutdown periods, completely drain the
pump and blow out all liquid passages and pockets with
compressed air. Freezing of pump liquid can also be prevented
by filling the pump with antifreeze solution.
5. Maintenance
Before attempting any inspection or repair on the pump, the driver
controls must be in the "OFF" position, locked and tagged to
prevent injury to personnel performing service on the pump.
5.1 Motor lubrication
To lubricate the motor while running or at rest, remove grease
drain plug (if any) and filler plug on grease fitting. Grease with
clean lubricant until grease appears at drain hole or along motor
shaft.
One-half to one cubic inch of grease is sufficient for motors 5 HP
and under, with proportionately more grease for greater HP
motors.
Caution
Never run the pump dry in the hope that it will
prime itself! Serious damage to the shaft seals,
pump wear rings and shaft sleeves will result.
Warning
In the interest of operator safety, the unit must
not be operated above the nameplate conditions.
Such operation could result in unit failure
causing injury to operating personnel. Consult
instruction book for proper operation and
maintenance of the pump and its supporting
components.