Franklin Electric 4 in Series V Submersible Well Pump - 10-25 GPM, 1/2-1.5 HP

The Series V (Series Five) submersible pump uses hydraulics that improve efficiency and minimize wear, even when pumping abrasives. Discharge head and motor bracket come in 300 Series stainless steel or thermoplastic, with a removable check valve system. Franklin builds it in four performance ranges, 10, 15, 20 and 25 GPM, from 1/2 to 5 HP.

• Four performance ranges: 10, 15, 20 and 25 GPM
• Horsepower range: 1/2 to 5 HP
• Discharge head and motor bracket in 300 Series stainless steel or high quality thermoplastic resins
• Large wrench flat area on the discharge head for ease of installation
• Dry-run designed top bearing positively supports the 300 Series stainless steel 7/16 in hex shaft

Find your horsepower in the row, then read across. Total head is the lift from the pumping water level, plus the pressure you want at the tank (2.31 ft for every PSI), plus friction in the drop pipe. The output tables give the flow you get at a 30/50 PSI pressure switch for your depth to water.

10 GPM class — total head in feet at three flows

15 GPM class — total head in feet at three flows

20 GPM class — total head in feet at three flows (curves end at 29-30 GPM)

25 GPM class — total head in feet at three flows

Total head read from the published curves in Franklin’s FPS Residential Submersible Catalog (MF5060), pp. 31, 34, 37 and 40, digitized and rounded down to whole feet, at the plotted flows nearest 20%, 50% and 75% of where the curves end. 0 GPM is Franklin’s printed shut-off. Feet of head = PSI × 2.31. Franklin’s published curves and printed tables differ here: the 15 GPM 3/4 HP curve reads about 8 ft above Franklin’s printed output tables on average; the 20 GPM 3/4 HP curve reads 201 ft near zero flow against the printed 188 ft shut-off; the 20 GPM 1 HP curve reads 275 ft near zero flow against the printed 260 ft shut-off; the 20 GPM 1-1/2 HP curve reads 346 ft near zero flow against the printed 375 ft shut-off. The head table follows the published curve (re-read from Franklin’s vector chart data); the 0 GPM column and the output tables follow the printed figures.

Output in GPM at 30 PSI (switch cut-in), by depth to water

Output in GPM at 50 PSI (switch cut-out), by depth to water

Output tables as printed in MF5060, pp. 32-33, 35-36, 38-39 and 41, at the 30 and 50 PSI rows; Franklin rounds them to whole GPM. Drop-pipe friction is not included (manufacturer note). — marks a point Franklin does not print.

The 20 and 25 GPM curves rise a few feet above the printed shut-off at low flow before they fall, so a low-flow column can read slightly above the shut-off.

3-wire control box by horsepower (ordered separately)

Best operating range: Franklin shades the best-efficiency range on each published curve and prints no figures for it. The curves are in the image gallery.

• Maximum diameter across the cable guard is 3.90 in on all models
• Discharge: 1-1/4 in NPT
• Maximum water temperature: 120 °F (49 °C) with proper flow; consult the factory for details

• Install in a developed well; undeveloped water carries abrasives that wear the pump.
• Set the pump at least 5 ft off the bottom of the well and above the well screen or casing perforations, unless cooling flow past the motor is assured.
• Use positive-sealing check valves only, never swing type: one in-line within 25 ft of the pump below drawdown, and one every 200 ft of setting beyond 200 ft.

From the Franklin 4 in and 6 in submersible pump owner’s manual (106467101).