SQ 3" 2 Wire Submersible Pumps
Grundfos SQ 3" submersible pumps ship "FREE" in 24 hrs. of order!
The Grundfos SQ Series has been designed to fit inside a 3" ID pipe. It has tight clearance because this allows the water to cool the pump motor as water is drawn past the motor into the pump. The SQ is a 2 lead wire + 1 ground wire pump. It has a built in check valve and the outer shell, wire guard, inlet screen and outlet fitting are all stainless steel. It is commonly used for automatic operation using a pump pressure switch and properly sized pressure tank. It can also be switch on or off manually using the correct supply voltage. It has many benefits most other submersible pumps dont. It has soft starting technology which means it doesnt require the high surge of amperage required by other pumps to start pumping. It is ideal when using a generator or a modified sine wave inverter because of this feature. It has a run dry feature built in so if it runs dry of water it shuts down, waits a few minutes before restarting to see if water is present. stopping again if not etc. It has over and under voltage shut down protection. This pump is also a solution to an irregular 4" well casing that won't accept a 4" pump any longer.
NOTE: The main difference between an SQ and SQE model pump is that the SQE model starts as an SQ model but has communication electronics added. The SQE model can then communicate with the CU300/CU301 SmartFlo controllers without using any additional wires(similar to DSL and the telephone working together on the same wires). If your simply using a pressure switch or manual power supply, the SQ pump model operates similar to a standard submersible well pump at full speed only. The SQE model can be wired straight to the power supply without using a controller and used as an SQ model at full speed only but without the use of the controller its variable speed ability and other controller functions are not available. Both SQ/SQE models have soft start, over/under voltage protection and run dry features when wired direct to required voltage.
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Selecting a Grundfos SQ Submersible Pump