Wiring SQE Pumps [RE-wrenches]

[Dan Rice]

Ray,

Since you mention it, if I was trying to use a flow switch, I probably would
consider using a larger expansion tank -the SQE systems I've seen use a #15
tank -I'd probably switch to a #30. I'm not sure how well the M&M switches
can sense especially low flows. A slow leak in a faucet could end up
draining pressure without triggering the flow switch and turning on the
pump. Adding a pressure sensing switch would help with this problem, though
it would have to be a switch with no hysterisis -just a contact that turns
on below a specific pressure, and off above that same pressure, like an oil
pressure light switch on an engine. The ON pressure would be set just below
the normal system operating pressure, and the switch would normally be off
when the system is operating correctly.

 I think your observation about not combating some phantom loads is a good
one, especially if  there's an X240 in the system in the first place.
Eliminating extra controls is probably worth the extra energy used by the
system -especially since it's renewable energy and not coal or nuke. Do you
know what the standby load is?

I'm just glad I have water, never mind constant pressure. I hope Taos has
been getting some of this rain that's been bathing Santa Fe. Sure feels
good.

Dan


----- Original Message -----
From: "Ray Walters" <walters at taosnet.com>
To: <RE-wrenches at topica.com>
Sent: Friday, June 30, 2006 10:01 PM
Subject: Re: Wiring SQE Pumps [RE-wrenches]


|
| A good idea, I may try it. I just wondered, would the flow switch go
| back off , if the p tank ran out of steam before the pump got flow
| going? Or maybe a little drop in pressure delay. I guess it would be a
| matter of having a big enough pressure tank vs. the time delay for the
| pump to go through its start sequence and actually begin pumping.
|  I've been reconsidering this whole issue of search mode anyway: most of
| my higher end customers with wells are going for inverter on/ no search
| mode anyway. Maybe its another phantom load we don't try and slay
| anymore.....
|
| Thanks for your help,
|
| Ray
|
| Dan Rice wrote:
|
| >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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