Please leave these instructions with the pump for future reference.
Redi-Flo4
Stainless Steel Submersible Pumps
for Environmental Applications
GRUNDFOS INSTRUCTIONS
US Installation and operating instructions
1
SAFETY WARNING
Grundfos Stainless Steel Submersible Pumps
Your Grundfos Redi-Flo4 Environmental Pump is of the utmost quality. Combined with
proper installation, your Grundfos pump will give you many years of reliable service.
To ensure the proper installation of the pump, carefully read the complete manual
before attempting to install the pump.
Shipment Inspection
Examine the components carefully to make sure no damage has occurred to the
pump-end, motor, cable or control box during shipment.
This Grundfos Redi-Flo4 Environmental Pump should remain in its shipping carton until it is
ready to be installed. The carton is specially designed to protect it from damage. During
unpacking and prior to installation, make sure that the pump is not contaminated,
dropped or mishandled.
The motor is equipped with an electrical cable. Under no circumstance should the cable
be used to support the weight of the pump.
You will find a loose data plate wired to the pump. It should be securely mounted at the well
or attached to the control box.
PRE-INSTALLATION CHECKLIST
Before beginning installation, the following checks should be made. They are all
critical for the proper installation of this submersible pump.
A. Condition of the Well
If the pump is to be installed in a new well, the well should be fully developed and bailed or
blown free of cuttings and sand. Dispose of discharged materials in accordance with the
specific job site requirements. The stainless steel construction of the Redi-Flo4
Environmental Pump makes it resistant to abrasion; however, no pump, made of any
material, can forever withstand the destructive wear that occurs when constantly pumping
sandy groundwater.
Determine the maximum depth of the well, and the drawdown level at the pump’s maximum
capacity. Pump selection and setting depth should be based on this data.
The inside diameter of the well casing should be checked to ensure that it is not smaller than
the size of the pump and motor.
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B. Condition of the Water
Redi-Flo4 pumps are designed for pumping cold groundwater that is free of air or gases.
Decreased pump performance and life expectancy can occur if the groundwater is not cold
or contains air or gases.
C. Installation Depth
Pumping sand or well sediment can occur when the pump motor is installed lower than the
top of the well screen or within five feet of the well bottom. This can reduce the
performance and life expectancy of the pump and should be avoided.
If the pump is to be installed in a lake, containment pond, tank or large diameter well, the
water velocity passing over the motor must be sufficient to ensure proper motor cooling.
The minimum recommended water flow rates which ensure proper cooling are listed in
Table A.
D. Electrical Supply
The motor voltage, phase and frequency indicated on the motor nameplate should be
checked against the actual electrical supply.
WIRE CABLE TYPE
The wire cable used between the pump and control box or panel should be approved for
submersible pump applications. The conductor insulation should have a continuous Teflon
®
jacket with no splices and must be suitable for use with submersible pumps.
INSTALLATION
The riser pipe or hose should be properly sized and selected based on estimated
flow rates and friction-loss factors.
A back-up wrench should be used when the riser pipe is attaching a riser pipe or metallic
nipple to the pump. The pump should only be gripped by the flats on the top of the
discharge chamber. The body of the pump, cable guard or motor should not be
gripped under any circumstance.
If Steel Riser Pipe Is Used:
An approved pipe thread compound should be used on all joints. Make sure the joints are
adequately tightened in order to resist the tendency of the motor to loosen the joints when
stopping and starting.
When tightened, the first section of the riser pipe must not come in contact with
the check valve retainer in the discharge chamber of the pump.
PRE-INSTALLATION CHECKLIST
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After the first section of the riser pipe has been attached to the pump, the lifting cable or
elevator should be clamped to the pipe. Do not clamp the pump. When raising the pump
and riser section, be careful not to place bending stress on the pump by picking it up by the
pump-end only.
Make sure that the electrical cables are not cut or damaged in any way when the
pump is being lowered in the well.
The drop cable should be secured to the riser pipe at frequent intervals to prevent sagging,
looping or possible cable damage.
If Plastic or Flexible Riser Pipe Is Used:
Use the correct compound recommended by the pipe manufacturer or specific job
specifications. Besides making sure that joints are securely fastened, the use of a torque
arrester is recommended when using these types of pipe.
Do not connect the first plastic or flexible riser section directly to the pump.
Always attach a metallic nipple or adapter into the discharge chamber of the
pump. When tightened, the threaded end of the nipple or adapter must not come in
contact with the check valve retainer in the discharge chamber of the pump.
The drop cable should be secured to the riser pipe at frequent intervals using an approved
clip or tape to prevent sagging, looping and possible cable damage.
IMPORTANT - Plastic and flexible pipe tend to stretch under load. This stretching must be
taken into account when securing the cable to the riser pipe.
Leave enough slack between clips or taped points to allow for
this stretching. This tendency for plastic and flexible pipe to stretch
will also affect the calculation of the pump setting depth. If the depth
setting is critical, check with the manufacturer of the pipe to
determine how to compensate for pipe stretch.
When these types of pipe are used, it is recommended that a safety
cable be attached to the pump to lower and raise it. The discharge
piece of Redi-Flo4 submersibles is designed to accommodate this
cable (Figure 4).
Protect the Well from Contamination
While installing the pump, proper care should be used not to
introduce foreign objects or contaminants into the well. The well
should be finished off above grade to protect against surface water
from entering the well, causing contamination.
INSTALLATION
NOTE: Teflon® is a registered trademark of DuPont.
FIGURE 4
ELECTRICAL
4
WARNING: To reduce the risk of electrical shock during operation of this pump
requires the provision of acceptable grounding. If the means of connection to
the supply connected box is other than grounded metal conduit, ground the
pump back to the service by connecting a copper conductor, at least the size of
the circuit supplying the pump, to the grounding screw provided within the
wiring compartment.
All electrical work should be performed by a qualified electrician in accordance
with the latest edition of the National Electrical Code, local codes and regulations.
Verification of the electrical supply should be made to ensure the voltage, phase and
frequency match that of the motor. Motor voltage, phase, frequency and full-load current
information can be found on the nameplate attached to the motor. Motor electrical data can
be found in Table C.
If voltage variations are larger than ±
10%, do not operate the pump.
Direct on-line starting is used due to the
extremely fast run-up time of the motor (0.1
second maximum), and the low moment of
inertia of the pump and motor. Direct on-line
starting current (locked rotor amp) is
between 4 and 6.5 times the full-load
current.
Engine-Driven Generators
If the Redi-Flo4 pump is going to be
operated using an engine driven generator,
we suggest the manufacturer of the
generator be contracted to ensure the
proper generator is selected and used. See
Table B for generator sizing guide.
Control Box/Panel Wiring
Single-phase motors must be connected as
indicated in the motor control box. A typical
single-phase wiring diagram using a
Grundfos control box is shown (Figure 5-A).
High Voltage Surge
Arresters
A high voltage surge arrester should be
used to protect the motor against lightning
and switching surges. The correct voltagerated surge arrester should be installed on
the supply(line) side of the control box
(Figure 5-B). The arrester must be
grounded in accordance with the
National Electric Code, local codes and regulations.
FIGURE 5-A
FIGURE 5-B
Single-Phase Wiring Diagram for
GRUNDFOS Control Boxes
Single Phase Hookup
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