Franklin Submersible Well Pump owner manual Low-Yielding Well, Well Test

9.A three-phase pump does not require a motor control box . Fig. 4 shows a typical wiring diagram for a 3- wire, three-phase installation. A magnetic contractor with 3-leg protection having quick-trip ambient compensated overload relays must be used.

FIGURE 4 - 3-Wire, 3 Phase, 1-1/2 thru 50 HP Pump Wiring Diagram

LOW-YIELDING WELL

A low-yielding well exists when the output from the pump is greater than the yield of the well. It can reduce the water level to the suction screen so that a mixture of air and water enters the pump. Pumping may stop since the pump cannot generate pressure with insufficient water. In this case, the column of water already in the drop pipe holds the check valve closed and an airlock may develop inside the pump. Because the conditions ensure neither adequate lubrication of the pump nor proper cooling

Circuit Breaker OR Fused Disconnect Switch

Incoming 3 Phase Power

Pressure Switch

Magnetic Contactor w/

3-leg protection having quick-trip ambient conpensated overload relays

3 Phase Submersible Motor

for the motor, damage can result if power is not cut off quickly. use one or more of the following methods to correct and/or protect this installation.

1.	Install additional length of drop pipe to place pump
	lower in well if possible.
2.	Install a Franklin Pumptec or similar electronic
	drawdown sensor.
3.	Install a floatless liquid level control. This device
	consists of an electrical relay activated by currents
	flowing through the ground-return circuits of

10.Use an ohmeter to make continuity and insulation checks after the installation is completed.

11.Place the additional pump nameplate onto the submersible label and place both onto disconnect switch or circuit breaker box for future reference.

WELL TEST

Check the pump and well performance before making the final connection to the discharge system.

1.Install a gate valve on the end of the pipe. Partially open the valve.

2.Start the pump.

3.Open valve gradually to give full flow.

4.If the discharge is not clear, let the pump run until water clears. If water does not clear in 30 minutes, stop the pump and take the necessary steps to correct the condition. After the water has appeared clear, check for sand by discharging into a clean bucket or suitable container.

5.Close valve until maximum required system flow rate is obtained (this should correspond to the cut- in pressure of the pressure switch). Ensure that the output of the pump at this setting is not greater than the yield of the well. This can be checked by monitoring the well drawdown level and ensuring tht the level is stable at the maximum required system flow rate.

CAUTION Never run pump unless it’s completely submerged in water. If run without water, the pump and motor could be damaged. Note also that air drawn into the pump can cause an airlock under certain conditions.

electrodes hung in the well. The lower(STOP)

electrode, just above the pump, ensures that the

water level can never be pumped down to the suction

screen. The upper(START) electrode, just below

the lowest static water level, ensures that the pump

can start again as soon as the well has recovered.

A floatless liquid level control works in series with

the pressure switch. Refer to the manufacturers

instructions provided with control.

4. Install a flow control valve in the discharge line

upstream from the pressure switch. This restricts

the output from the pump without affecting the rate

that water can be drawn from the pressure tank.

Nevertheless, a heavy demand for water could

empty the pressure tank, so a tank with a bonded

diaphragm, air cell, or water bag is recommended.

5. Install a smaller pump to avoid over pumping the well.

Have dealer size pump to the well yield.

6. Install a low-pressure cut-off switch. A low pressure

cut off switch, or a pressure switch with such an

arrangement built in, protects a shallow-well pump

from losing its prime, but it does not always provide

satisfactory protection to a submersible pump from

the effects of over pumping the well. This is because

it responds to a loss of pressure at the surface,

which may occur after an air lock has formed inside

the pump. We recommend either a floatless liquid

level control or a flow control valve, in that order,

in preference to a low-pressure cutoff switch as

protection against over pumping.

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