Operating The Pump - Grundfos SPK Series Installation And Operating Instructions Manual

Position of Terminal Box
The motor terminal box can be turned to any of four positions in
90° steps. To rotate the terminal box, remove the four bolts
securing the motor to the pump; turn the motor to the desired
location; replace and securely tighten the four bolts.
Boiler Feed Installations
If the pump is being used as a
boiler-feed pump, make sure the
pump is capable of supplying
sufficient water throughout its
entire evaporation and pressure
ranges. Where modulating
control valves are used, a
bypass around the pump must
be installed to ensure pump
lubrication.

Operating the Pump

Replacing The Motor
If the motor is damaged due to bearing failure, burning or
electrical failure, the following instructions detail how to remove
the motor for replacement. It must be emphasized that motors
used on SPK/CRK/MTR pumps are specially selected to our
rigid specifications. Replacement motors must be of the same
frame size.
Removing the Old Motor
1. Remove the coupling guard screens.
2. Using the proper metric allen wrench, loosen the four
cap screws in the coupling.
3. With the correct size wrench, loosen and remove the
four bolts which hold the motor to the discharge section
of the pump end.
4. Lift the motor straight up until the shaft is free from the
coupling.
Installing the New Motor
1. Thoroughly clean the surfaces of the motor and pump
end mounting flanges. Set the motor on the pump end.
2. Place the terminal box in the desired position by rotating
the motor.
3. Insert the mounting bolts, then tighten diagonally and
evenly.
4. Using a larger screwdriver, raise the pump shaft by
placing the tip of the screwdriver under the coupling and
carefully elevating the coupling to its highest point.
Note: The shaft can only be raised approximately 0.20
inches (5 mm).
5. Now lower the shaft halfway back down the distance
you just raised it (approximately the thickness of a
dime), and retighten the metric cap screws in the
coupling. Be sure to tighten the top and bottom screws
on one side of the coupling and then the other. Torque
the coupling screws to the following specifications.
Coupling
Bolt Size
M6
M8
M10
DISCHARGE DISCHARGE
Standard
Terminal
Standard
Terminal Box
Box
Position
Position
Can be
Can be
rotated in
rotated in
90° increments 90˚ increments
Minimum Torque
Specifications
10 ft-lbs
23 ft-lbs
46 ft-lbs
Operating The Pump
6. Check to see that the gaps between the coupling halves
are equal. Loosen and re-adjust if necessary.
7. Be certain the pump shaft can be rotated by hand. If
the shaft cannot be rotated or it binds, disassemble and
check for misalignment.
8. Replace the two coupling guard screens.
Starting The Pump The First Time
1. Air Elimination
As long as the pump body is partially submerged in fluid, the
pump may be started against an open or a closed discharge
line. If the discharge line is open, the air will quickly escape
through the discharge pipe. If the discharge line is closed,
the air will be pressed down through the pump body and out
into the tank so that the discharge pressure will quickly reach
its maximum (shutoff) level.
If the pump is fitted with a vent valve, this valve must be
opened while running the pump against a closed valve.
Once a steady stream of liquid is running out of this vent
valve it can be closed.
2. Check the Direction of Rotation
a. Switch the POWER OFF.
b. Make sure the pump has been filled and vented.
c. Remove the coupling guard and rotate the pump shaft
to be certain it turns freely. Replace the coupling
guard.
d. Verify that the electrical connections are in accordance
with the wiring diagram on the motor.
e. Switch the power on and observe the direction of
rotation. When viewed from the top, the pump
should rotate counter-clockwise.
f. To reverse the direction of rotation, first switch OFF the
supply power.
g. On three-phase motors, switch any two power leads at
the load side of the starter. On single-phase motors,
refer to the connection diagram on the nameplate.
Change wiring as required.
h. Switch the power ON and check for proper motor
rotation.
Starting And Adjusting
Before starting the pump, make sure that:
1. The pump body is partially submerged in the fluid.
2. The direction of rotation is counter-clockwise when
viewed from the top.
3. All piping connections are tight and the pipes are
adequately supported.
4. The pump inlet screen is clean and unblocked.
5. Depending on the application, it may be necessary to
start the pump against a closed discharge valve in order
to prevent system damage due to water hammer. If so,
this valve should be opened in a gradual manner after the
pump is started. Unless used as a flow throttling device,
make sure this valve is completely opened.
6. Check and record the voltage and amperage of the
motor. Adjust the motor overloads if required.
7. Check and record operating pressures if pressure
gauges have been installed.
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