Where's a good online place to buy a pump/motor?

[mas985]

Thats a good article but I think they are wrong about solar. While it is true that you may have 10-20 feet of static lift on pump start up, if you use high speed to prime the solar, the static lift goes away because you have +10 going up and -10 coming down so they offset each other. The low speed can then kick it to circulate and should be fine.

My Aqualogic controller has the high speed priming setting for 3 minutes, enough time to fill the solar .

Mark

[barnhillld]

I always know I can count on this forum for my pool advice... now if I just had a forum for dealing with college aged kids!

Seriously, thanks. I just ordered this pump from Perry's:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7755280487

Almost time to start bringing the water level up again!

Cheers,
Lloyd

[coolguy]

JimmyC, read you earlier post...did you actually convert a single speed pump/moter to a two speed one? Or did you replace the old motor with a new two speed motor? Just curious if you can convert a single speed motor to a two speed and how to do it if possible. My pump is a hayward 1.5 superpump that I'm currently running on 220. I suppose that maybe if I just run it with just one of the 220 leads, maybe that's how to do it, but I'm afraid to burn it up.

Appreaciate your help.

[mrduffin]

Ruuning a single speed pump with one lead unhooked will not burn your motor up. It just will not run at all.........but you will save money for sure!

Another idea some people have about pump operation cost is that it is cheaper to run a motor off 240 volt than it is to run the same motor off of 120 volt. At the power meter the cost is the same. (This is assuming you have a dual voltage motor)

[Jimmy C]

Coolguy,

I just replaced my motor with an equivelant HP 2 speed motor. I'm beginning to think I should have went down to 1.5 HP for my application, but now that I did it I will make the best of it. I purchased a relay, and a switch to deal with the speed selection. Now I need to make a time delay circuit so that the pump comes on at HIGH speed from anywhere between 3 minutes to 1 hour, and then switches to low speed for the rest of the pump ON time. Time delay relays are usually large, and expensive, so I plan on making my own timer circuit. The idea is to hide all this inside my Intermatic 1102 timer (the one with freeze protection).

Playing with motor speed with a single speed motor is possible, not recommended, and pretty complicated. This is often done with commercial 3 phase motors that employ variable speed by changing the voltage, and frequency simultaniously, i.e. lower speed means lower voltage, and lower rotating field frequency. I have actually done this with a single phase induction motor, but doing so took a lot of equipment, and it was only to prove the concept. Starting the motor is tricky too. For us pool folk, pick a motor designed for two speeds, and go for a swim!

Does anybody out there know or have data relating power factor of 2 speed motors for both LOW and HIGH speed?

Jimmy

[Brock]

Just keep in mind if you change out just the motor it will use the same HP no matter what is connected (given the same RPM). Say a 2hp pump and motor assembly is connected. You pull the 2 HP motor and put a 1HP motor. It will try to do the exact same work the 2HP was doing since the pump is the same, and should take approximately the same power. The way two speed motors get around this is speed. A single speed is typically the same at 1/8 HP to 2 HP.

[Jimmy C]

Brock, You make a lot of sense. My pump is pretty old, like 22 years old, and when I bought the house here in 2004, there was a 2 HP 1 speed motor on the pump. I have had two different folk tell me that my pump was supposed to have a 1.5 HP motor, not a 2 HP. I guess I forgot about that when I upgraded to a 2 speed pump. So I guess this means that my motor would be lightly loaded on high speed, and this would likely decrease the power factor. Then again maybe the impeller was also changed to match the motor. Who knows. I guess I'll take a amp-clamp to see if the motor draws rated amperage on high speed. I guess if the power factor is low, the current draw will remain high even if the motor is lightly loaded. I got some motor starting capacitors around to see if the they can decrease the current draw when placed across the motor wires. If that happens, maybe I can correct for low power factor. Do you or anyone out there ever get into this power factor correction stuff with pool puimps?