4.Use extreme care when handling the mechanical seal. The mating seal surfaces are polished and are easily damaged.

5.The mechanical seal can be changed without disconnecting piping by removing 4 bolts (see item 14 on page 9) and pulling the motor with pump seal plate and impeller assembly away from front pump housing body.

6.Remove impeller and rotating portion of seal by holding motor shaft and rotating the impeller counter-clockwise when facing the shaft extension on the motor.

7.The rotating portion of the seal can now be removed from the impeller. Clean the impeller hub and lubricate with soapy water. Wipe off shining carbon sealing surface of new mechanical seal with a clean tissue to remove oily fingerprints or other foreign materials. The new rotating seal can be pressed back onto the impeller.

8.To remove the stationary ceramic seal seat, first loosen the four motor bolts which run through the entire length of the motor into the seal plate. Remove the seal plate from the motor. Press the ceramic seat and rubber gasket out of the seal plate.

9.Clean the seal plate seal area and lubricate with soapy water. Press the new ceramic seal and gasket into the seal plate, being sure it is fully seated. Wipe off the ceramic sealing surface with a clean tissue to remove oily fingerprints or foreign substances.

10.Place the seal plate on the motor and carefully align the four motor through bolts. Secure the seal plate onto the motor being careful not to overtighten the bolts. Gradually bring bolts up to final tightness by moving across in a criss- cross pattern.

11.Check the position of the mechanical seal set in the seal plate and ensure the motor shaft is in the center of the seal set.

12.Screw the impeller with new rotating seal onto the motor shaft. Rotate the motor shaft to make sure the impeller is not touching the seal plate.

13.Clean the seal plate “O” Ring and check to make sure it is in position. Replace the motor and seal plate on the front pump housing body and bolt into position with 4 bolts. Gradually bring bolts up to final tightness by moving across in a criss-cross pattern.

14.Refer to initial start-up procedures to restart the pump.

SECTION V. WINTERIZINGPROCEDURE

NOTICE

Allowing the water to freeze in pump will damage the pump and cause potential water damage/flooding and potential property damage.

1.Drain all water from pump housing and piping when freezing temperatures are expected. A drain plug is provided to drain the pump. If the pump has a strainer pot both the strainer drain plug and the housing drain plug should be removed. If pump has no strainer pot then only remove the housing plug.

2.If the pump can be removed and placed in an inside dry location this should be done.

3.For an outdoor unprotected location it is best to protect the equipment in a weatherproof enclosure.

4.Do not wrap the motor with plastic because condensation could form inside the motor.

5.In installation where the pump cannot be drained a 40% propylene glycol 60% water solution will protect to -50° F.

NOTICE

Do not use anti-freeze solutions except propylene glycol, as other anti-freeze is highly toxic and will damage the pump.

P/N 350039 Rev. C 8-24-06

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Pentair 4HP-VD - 3' STD, 4HP-HD - 3' STD service manual Section V. Winterizingprocedure
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4HP-VD - 3' STD, 4HP-HD - 3' STD specifications

Pentair is a leading provider of innovative water solutions, and its 4HP-HD and 4HP-VD series submersible pumps showcase the company's commitment to efficiency and reliability in water management applications. These pumps are designed to deliver superior performance for a variety of needs, from residential to commercial applications.

The Pentair 4HP-HD - 3' STD and 4HP-VD - 3' STD pumps are engineered to operate effectively at higher head conditions. With a robust 4 horsepower motor, these pumps are capable of handling demanding tasks, delivering quick and effective water transfer. The standard model features an extensive set of capabilities that make it ideal for various water management functions, including dewatering, effluent transfer, and irrigation tasks.

One of the main features of the Pentair 4HP-HD and 4HP-VD series is their durable construction. These pumps are designed with high-quality materials that withstand the harshest conditions, ensuring a long operational lifespan. In addition, they are fitted with a silicon carbide mechanical seal to provide superior protection against wear and contamination, further enhancing their reliability.

The technology behind these pumps incorporates advanced hydraulic design. The impeller is constructed to optimize flow rates while minimizing turbulence, which effectively enhances efficiency and reduces energy consumption during operation. The pumps maintain a consistent performance level, thanks to their efficient cooling systems which prevent overheating even during prolonged use.

The Pentair 4HP-VD model introduces variable speed technology, allowing for greater control over flow rates and pressure. This feature is particularly beneficial in applications where demand fluctuates, providing operators the ability to adjust the pump’s performance according to specific requirements. Users can expect reduced energy costs and prolonged equipment life as a result of this advanced technology.

Both the HD and VD models include features such as automatic reset overload protection, ensuring safe operations and preventing damage to the pump in cases of power issues. The intuitive design also allows for easier installation and maintenance, with a user-friendly interface that ensures operators can quickly manage and monitor performance.

In summary, the Pentair 4HP-HD - 3' STD and 4HP-VD - 3' STD pumps exemplify Pentair’s dedication to delivering high-performance water solutions. With their robust construction, advanced hydraulic design, and innovative variable speed technology, these pumps are ideal choices for those seeking reliable and efficient water management solutions.
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