Section 6 - Starting The Pump; Section 7 - Pump Disassembly And Reassembly; Pump Disassembly - Xylem VS Manual Del Usuario

9. After the well head has been properly tightened,
carefully rotate the entire unit in the well until the
discharge flange is facing in the desired direction. Push
the unit to one side of the well, providing the maxi-
mum clearance for the drop cable when rotating the
unit.
10. Slowly lower the well head onto its mounting
surface. BE CAREFUL NOT TO DAMAGE THE
GROUNDING SYSTEM OR PINCH THE POWER
CABLE BETWEEN THE SURFACE PLATE AND
THE WELL CASING. If a gasket or other seating
device is used, be sure that it is aligned properly and
that it is not damaged. Install the mounting bolts.
11. Before connecting the power cable to the control
panel:
Take a resistance reading between the power cable
conductors and ground to assure that the insulation
on the cable or splice was not damaged during instal-
lation. See Appendix C.
Measure the resistance of the power cable and motor
circuit. See Appendix C. Compare these readings with
those taken in Section 4 to assure that the splice is still
intact. Make the electrical connection between the power
cable and the control panel. It may be desirable to use a
terminal box at the well head to simplify the electrical
work required when the pump is pulled. Be sure that the
unit is grounded properly.
FAILURE TO GROUND THE UNIT
WARNING
PROPERLY CAN RESULT IN SERIOUS
OR FATAL SHOCK. REFER TO ELECTRICAL CODE
REQUIREMENTS.
Be sure to connect the leads as they were marked
previously in the procedure.
SECTION 6 — STARTING THE PUMP
INITIAL STARTUP AND TESTING
CAUTION
MAY REQUIRE STARTING AND
STOPPING THE PUMP SEVERAL TIMES. BE SURE
TO ALLOW ADEQUATE COOLING OFF PERIOD
BETWEEN STARTS. CONSULT THE MOTOR MAN-
UAL. IF NO INFORMATION IS GIVEN, A GOOD
RULE-OF-THUMB IS TO ALLOW A MINIMUM OF
15 MINUTES BETWEEN STARTS.
For initial startup, allow the water to be pumped out
onto the ground. A throttle valve in the discharge line is
recommended. Position the throttle valve approximately
one-forth open for startup of the pump. This will prevent
surging the well or the pump during startup.
If the pump has been in the well for several days before
the startup, check the resistance between the cable con-
ductor and ground to assure that water has not penetrat-
ed the splice or the cable insulation. See Section 4.
Clamp the tongs of a clamp-on type ammeter around
one power lead to the pump. Set the ammeter on the
maximum scale. After the motor starts, it can be reset to
a lower scale as desired.
Refer to the motor manual and determine the normal
operating amps for the installed motor.
Start the pump and observe and record the current
readings on each conductor of the power lead. If the
8
current exceeds the normal value determined in the mo-
tor manual, stop the pump immediately. A high current
reading indicates that something is wrong. Among the
potential problems are:
• Incorrect pump rotation (3 phase only)
• Improper voltage
• Sand locked pump
• Improper cable size or leak in cable
• Mechanical damage
In any case, the problem must be corrected before the
pump can be operated.
On three phase units, if water does not appear within
one minute (deeper settings may require approximately
one half minute per 100 feet setting) the motor may be
running backwards. Stop the pump and interchange any
two of the three cable connections. If there is any doubt
about the proper rotation, run the motor in one direction
and then the other. The rotation that gives the highest
pressure and flow is always the correct one.
Check the voltage. The voltage when the pump is run-
ning should be within 5% of the pump motor nameplate
voltage.
Open the throttle valve. If a flow meter is available, open
the throttle valve to rated flow of the pump. If sand ap-
pears in the water, throttle the pump at approximately
80% of full flow until the sand clears. If excessive noise
develops, pressure fluctuates or water appears foamy
white, the pump is probably cavitating and the flow
should be throttled until the noise diminishes, the pres-
sure remains steady and the water is clear.
On three phase units, check for current unbalance.
Details of the current unbalance test are given in the Ap-
pendix C. THE MAXIMUM ALLOWABLE CURRENT
UNBALANCE IS 5%. If the current unbalance exceeds
5% after rolling the leads and connecting them for the
lowest unbalance, the pump should be stopped and cor-
rective action taken. Current unbalance in excess of 5%
can be expected to cause excessive heating in the motor
and premature failure. Operation with a current unbal-
ance in excess of 5% will void the warranty.
After the unit is operating properly, a performance test
should be considered. If a performance test is conducted
when the pump is new, subsequent tests can be used to
determine the degree of wear or deterioration of the
pump without removing it from the well. After the unit
has been in operation for approximately one week, per-
form the routine tests.
SECTION 7 — PUMP DISASSEMBLY AND
REASSEMBLY
1. Clear a large area adjacent to the pump as storage
space for pump parts as they are disassembled. If the
pump has a long column, arrange parallel timbers on
the ground to support the pump column horizontally.
After disassembly for repair or replacement of pump
components, reassemble in all cases in the reverse
order of disassembly.
NOTE: PUMP COMPONENTS SHOULD BE
MATCH-MARKED PRIOR TO
DISASSEMBLY.