Flint & Walling Constant Pressure Pumping Stations - end suction centrifugal pumps User Manual

Page 5

95 North Oak Street • Kendallville, IN 46755

Figure 8

Warning: Connect

motor leads

momentarily for

correct rotation

Motor

Pressure
Switch

Magnetic Starter Wiring
Diagram - Single Phase

Fused
Disconnect
Switch

Lightning
Arrestors

#10 Or Heavier Copper Ground Wire,
Connect To 8 ft. Ground Rod Or Well Casing

IL0102

Figure 9

Pressure Switch

Magnetic Starter Wiring
Diagram - Three Phase

Fused Disconnect
Switch

Lightning
Arrestors

#10 Or Heavier Copper Ground Wire,
Connect To 8 ft. Ground Rod Or Well Casing

Motor

OPERATION
PRIOR TO STARTING
Before the pump is started initially, make the following
inspections:
• Check Rotation - Be sure that the pump operates in

the direction indicated by the arrow on the pump
casing, as serious damage can result if the pump
is operated with incorrect rotation. Rotation is
always counterclockwise facing the pump suction.
Operating the pump in reverse rotation may cause
extensive damage.

• Check all connections to motor and starting device

with wiring diagram. Check voltage, phase and
frequency on motor nameplate with line circuit.

ALL PUMPS WITH 3 PHASE MOTORS MUST BE

INSTALLED WITH A MAGNETIC STARTER WHICH

PROVIDES 3-LEG PROTECTION FOR MOTOR.

FAILURE TO USE CORRECT STARTER WILL VOID THE

WARRANTY.

PRIMING
1. Before starting any centrifugal pump it is absolutely

necessary that both the casing and suction pipe be
completely filled with liquid. This priming can be
accomplished by any of the following methods.

2. When the liquid supply level is above the center

line of the pump, it is primed by opening the
suction and discharge valves. The in flowing liquid
will displace the air and fill the suction line, pump
casing, and discharge line up to the level of supply.

3. Where the pump is operating with suction lift and

the suction line is equipped with a foot valve, the
system is filled with liquid by filling through the
discharge piping.

STARTING
1. Follow the steps below in the order indicated to start

pump:

• Close gate valve in discharge line.
• Open gate valve in suction line.
• Turn on power to pump motor.
2. When pump is operating at full speed, immediately

open the discharge gate valve slowly.

3. If the pump does not prime properly, or loses it

prime during start-up it should be shut-down and
the condition corrected before the procedure is
repeated.

NOTE: The gate valve in the discharge line should
always be closed when the pumps is started. The
excessive current required by the motor to start under
full load will in time cause motor trouble. A centrifugal
pump primed and operated at full speed with the
discharge gate valve closed usually requires much less
power than when it is operating at its rated capacity
and head with the discharge gate valve open.
OPERATING CHECKS
After initial start-up:
• Check the pump and piping to assure there are no

leaks.

• Check and record pressure gauge readings for

future reference.

• Check and record voltage, amperage per phase.
STOPPING PUMP
1. When stopping pump always close the discharge

valve first.

2. Pump should never run for any length of time with

both suction and discharge valves closed due to
danger of building up pressures and temperatures.

MAINTENANCE
LUBRICATION
The pump and motor requires no lubrication. The ball
bearings of the motor have been greased at the factory.
Under normal operating conditions they should require
no further greasing.
FREEZING
Drain the entire system if there is danger of freezing. A
drain plug is provided at the bottom of the pump case
for this purpose.