Little Giant W12G05S7-21P - 1/2 HP 12 GPM HP Deep Well Submersible Pump (2-Wire 115V) : Install Checklist : Page 2

8. Pump/Motor Installation

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A. Splice motor leads to supply cable using electrical grade solder or compression connectors, and carefully

insulate each splice with watertight tape or adhesive-lined shrink tubing, as shown in motor or pump

installation data.

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B. Support the cable to the delivery pipe every 10 feet (3 meters) with straps or tape strong enough to

prevent sagging. Use padding between cable and any metal straps.

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C. A check valve in the delivery pipe is recommended. More than one check valve may be required,

depending on valve rating and pump setting; see page 5 for details.

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D. Assemble all pipe joints as tightly as practical, to prevent unscrewing from motor torque. Torque should

be at least 10 pound feet per hp (2 meter-KG per kW).

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E. Set the pump far enough below the lowest pumping level to assure the pump inlet will always have at

least the Net Positive Suction Head (NPSH) specified by the pump manufacturer. Pump should be at

least 10 feet (3 meters) from the bottom of the well to allow for sediment build up.

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F. Check insulation resistance as pump/motor assembly is lowered into the well. Resistance may drop

gradually as more cable enters the water, but any sudden drop indicates possible cable, splice or motor

lead damage; see page 45.

9. After Installation

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A. Check all electrical and water line connections and parts before starting the pump.

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B. Start the pump and check motor amps and pump delivery. If normal, continue to run the pump until delivery

is clear. If three-phase pump delivery is low, it may be running backward. Rotation may be reversed (with

power off) by interchanging any two motor lead connections to the power supply.

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C. Check three-phase motors for current balance within 5% of average, using motor manufacturer instructions

Imbalance over 5% will cause higher motor temperatures and may cause overload trip, vibration, and

reduced life.

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D. Verify that starting, running and stopping cause no significant vibration or hydraulic shocks.

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E. After at least 15 minutes running time, verify that pump output, electrical input, pumping level, and other

characteristics are stable and as specified.

Date _____________________ Filled In By _________________________________________________________________

Notes _______________________________________________________________________________________________

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SUBMERSIBLE PUMP

Installation Check List

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