Grundfos SQFlex Merkblatt

Page 1

One of the reasons the Grundfos SQFlex solar water pump is ideal for living off the grid is because it

is simple to install if you follow some basic steps.

Items you will need in addition to the submersible pump:

●Black Poly pipe, connectors, and clamps. Use 1” for 3 SQF or 6SQF. Use 1¼ inch for 11 SQF and

25SF. Use 2” for 40SQF and 75 SQF. You don’t have to use rigid steel pipe.

●Rope, 1/2”. Poly rope works well, don’t use Manila rope, it falls apart after a while. Buy more rope

than your well depth. Use a good sturdy knot if you have to tie lengths of rope together.

●A roll of black tape.

●A sturdy eye hook on or near the well head to tie the rope to.

●Submersible Pump Cable, 10 ga, 2 conductor with ground wire.

●Underwater Cable Splices and Heat Shrink Tube to attach the pump cable to the submersible

cable. See “How to use Underwater Cable Spices”.

Procedure:

1. Lay the pump next to the well head.

2. Roll out the pipe, rope, and cable side by side, starting from the well head. Measure these to

make sure you have enough to get to your water level in the well.

3. Attach the pipe, rope, and cable to the pump. Use Underwater Cable Spices for the cable

connections.

4. Wrap the pipe, rope, and cable together with the black tape.

5. Create a place to anchor the rope near the well head. A sturdy hook on the well head or well cap

will work.

6. For shallow wells, lower the pump and rope/pipe/cable assembly into the well. This may take two

or more people, because it’s heavy. One person at the well head, and another person as a safety

at the end of the rope. Wear leather gloves so you don’t get rope burn.

7. If you have to lower the pump more than a couple hundred feet, you should use a winch or a

sturdy pulley attached to a truck to control the rope. Lay a steel barrel down sideways at the well

head and run the rope/pipe/cable assembly over it to reduce pinching and abrasion as the

rope/pipe/cable goes into the well. You will need more rope on hand with this technique.

8. When the pump is at the correct depth, tie off the rope on the hook.

Black Polyethylene Pipe. Use

the NSF grade instead of Utility

grade, because NSF is thicker

and stronger.

Join pipe pieces with four

clamps. For details on working

with poly pipe, see “Input and

Output Pipe Details” in the High

Lifter section.

Use a barrel on its side to

reduce abrasion and kinking

How to Install the Grundfos SQFlex Submersible Pump

Page 2

How to Install the Grundfos SQFlex Submersible Pump

Ground

LA302DC

Lightning

Arrestor

If the cable run to the controller

is more that 30 feet, you may

want to install a “Weatherproof

Outlet Box with Blank Cover”

where you can connect the

expensive sub pump cable to

economical outdoor Romex

cable.

Ground

Use Underwater

Cable Splices here

to join the pump

cable with the

submersible cable.

Make sure the dry run

switch is underwater.

It’s a little grey bulb

on the pump cable.

Extension

Cable with

connectors

Romex, 10 gauge,

outdoor grade,

2 conductors

plus ground wire

Float Switch

in Tank

250 Watt Solar

Module

250 Watt Solar

Module

18 gauge

2 conductor

cable

CU-200

Box

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