Wiring SQE Pumps [RE-wrenches]

[Dan Rice]

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Ray,

Another alternative to switching the SQE controller on and off may be to use
a flow switch. If memory serves me, the SQE system typically includes a
small pressure tank which may have enough capacity to initiate flow in the
main line when a faucet is opened, prior to the pump starting up. A flow
switch in the main water line would detect that flow, and would switch power
on the controller during flow, and off when flow stops. McDonnell & Miller
manufactures pressure switches that may have the correct range for this
application. Their catalog is available at
http://www.mcdonnellmiller.com/prod/MM-825.pdf -the catalog section on Flow
Switches begins on catalog page 102, and includes several pages of info on
how to choose a flow switch for a particular application. I use one of their
FS4 series switches on my conventional well pump to sense when the water
level in the well drops and the pump sucks air -it works great in that
application.

Good luck.

Dan Rice

----- Original Message -----
From: "Ray Walters" <walters at taosnet.com>
To: <RE-wrenches at topica.com>
Sent: Monday, June 26, 2006 3:37 PM
Subject: Wiring SQE Pumps [RE-wrenches]


Here's another pump question: I've recently started trying the constant
pressure pumps from Franklin (the CP Mono-Drive and DO work on the
SW4024) and the SQE from Grundfos. People love the constant pressure, we
like the no surge, and higher efficiency. Here's the problem though, on
regular pumps, we wired 120 vac to the pressure switch, which then only
fire up the transformer and pump control when you needed water. On the
new constant pressure setups, they use a pressure transducer, or signal
switch, and we have to leave the transformer and controller on 24/7.
I thought about using a 2nd regular P-switch to feed power to the
system, but with a constant pressure system it would never reach the
high pressure cutoff. I thought about a voltage relay that shut off the
pump, when the controller quit sending power to the pump, but how do you
turn it on? We thought about controlling the relay with the signal from
the pressure transducer, but it might shut power on & off to the pump
every second....Day/ night timer.....
Who has the nifty way to wire this? Or just leave it all on, all the time?

Thanks as alway for all your great help,

Ray Walters


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