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Old 05-12-2008, 05:43 PM   #16
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Pool Motor Wiring Assistance


thank you guys so much for all of the assistance! I have the motor installed wired and running, as well as the chlorinator. I only have one problem and this may not be the right place to ask but I figured it couldnt hurt.

The suction of the vacuum is too weak now and it worked fine before. Could it be weak because of something to do with the way I wired it? if a connection was not solid, could the motor not be getting enough electricty causing it to not work as hard? This motor is the same HP as the old one so that shouldnt be an issue. thoughts?

thanks again! :-)

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Old 05-12-2008, 08:50 PM   #17
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Pool Motor Wiring Assistance


I doubt if the problem is with the motor wiring, assuming it's a single speed motor. Some pool pumps are two speed, if so check that it's wired high speed. A loose connection will burn up in just a few minutes.

Centrifugal pumps (pool pumps, etc.) come in a multitude of sizes and pressures. Generally, pressure is expressed in 'feet of head'. 2.31 feet = 1 PSI. This is obviously useful for figuring well pumps, but for now, we'll just call it pressure. Pressure on the output is directly related to suction on the input.

The HP of a pump depends on two factors, pressure across the pump, and flow through it. For example, a 1HP pump operating at 50PSI (pounds per square inch) will flow about 20 GPM (gallons per minute). If we needed say, 50GPM, we could do 1 of 2 things; increase the HP, or reduce the pressure. Or both. In either case, we would need to re-design the pump.

Now, let's look at one pump (no re-design). Using the above example, if the pump is operating at 50PSI, and 20GPM, it'll need 1HP. If we close a valve a bit, the pressure will increase, and the flow will decrease. In a centrifugal pump, HP follows flow, not pressure. In the above case, HP also decreases. If we increase flow, pressure will decrease, but HP will increase as well. High pressure pumps can easily be overloaded if operated at low pressure. Low pressure pumps operated at high pressure don't load the motor very much.

All of this is to say that the new pump has a different flow/pressure than the old one. Since there's less suction, I suspect the motor is not being loaded very much. (less flow through the pump). The new pump is likely designed to operate at a lower pressure than the old one, but because it's running at a higher pressure than designed, flow (and suction) is less. Running a pump at a higher pressure than designed (within reason) doesn't hurt it, it just doesn't work it very hard. Running it at too low of pressure will overload the motor.

Unfortunately, there isn't an easy solution to your situation. I don't know how to decrease the pressure across a filter, maybe a small bypass line? If the backwash valve has a 'pump to waste' position, that'd decrease pressure, and increase flow.

Rob
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Old 05-12-2008, 09:55 PM   #18
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Pool Motor Wiring Assistance


wow, thanks Rob!

The pump is actually the same, I only replaced the motor. But at least it doesnt sound like I wired something wrong. I'll have to re-read your post in the morning when I'm not so tired and can understand it better.

taz :-)
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Old 05-16-2008, 10:42 PM   #19
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Pool Motor Wiring Assistance


ok, I have finally got the new junction box installed and the new motor installed and everything wired and put together etc, and the pump is working properly with the proper suction.

you guys were extremely helpful, thanks so much!

taz :-)

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