Pool pump is a Hayward Ecostar SP3400VSP. Current motor is a single-speed Century 1.25HP (Model HSQ125). I am replacing it with a variable-speed Century VGreen 1.65HP (Model EVQ165). Do I need a new impeller and diffuser due to the change in HP? Inyopools.com indicated I could use the existing impeller and diffuser, but my water flow would not be at the rate of a 1.65HP. Anything else I should know?
Motor replacement on Hayward Ecostar SP3400VSP
- Thread starter dolphinjoy
- Start date
EcoStar SP3400VSP is a 2.7 total horsepower pump. The impeller number is SPX3220C. You need to check the number on the impeller to see if it was changed for that Century motor. It should be a SPX3207C.
If it was changed to a 3/4hp (1.25THP) impeller, Inyo is correct. It doesn't matter how large a motor you put on it, a 1.25THP impeller will only move that amount of water.
Disassembly has revealed a Hayward SPX3207C 1/2-Horsepower Impeller. Is there a better impeller for the new motor?
Do you have automation?
If not the best option is to get a Nidec Neptune NPTQ 270 motor, a Hayward SPX3220C impeller, a GO KIT 80V (shaft seal and O rings) to bring that pump back to its original form as a 2.7THP pump. Cost, not counting labor if you need it done for you, about $800.00.
You would then have all the advantages that pump originally had at less than half the cost.
I have used that motor on the TriStar/EcoStar pumps with good success.
If you are going to use a 1.65 THP motor, get the SPX3210C impeller and the GO KIT 80V or there is no point in getting a motor that size, you will still have a 3/4 (1.25THP) pump.
SPX3205C is a 1/2hp impeller.
If there is an impeller screw (left-hand threaded) be sure that it is replaced.
No automation. For my next motor, I will probably get the Nidec Neptune. Instead of the SPX3210C which is 1-horsepower impeller, what about the SPX3215C which is a 1-1/2 horsepower impeller?
There is currently no impeller screw and impeller ring which makes me wonder about the previous motor replacement by our pool service.
SPX3205C = 1.0 hp
The SPX3207C will work with a 1.25 hp total motor.
The SPX3210C takes a 1.65 total hp motor.
SPX3215C = 2.2 hp
SPX3220C = 2.7 hp.
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The SPX3207C will work with a 1.25 hp total motor.
The SPX3210C takes a 1.65 total hp motor.
SPX3215C = 2.2 hp
SPX3220C = 2.7 hp.
Impeller Ratings
What is the THP for the following Hayward TriStar impellers: SPX3220C SPX3215C SPX3210C
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Help Choosing Hayward SP3215X20 Impeller
I am in need of replacing the impeller on my SP3215X20. It has a 2HP "Max Rated" motor. The current impeller in it is a SPX3215C. However, in the manual (https://www.hayward-pool.com/assets/documents/pools/pdf/manuals/TriStar.pdf), it lists this part as being a "Impeller for 1 ½ HP with...
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There is no advantage to installing the SPX3215C impeller, a 2.25 total horsepower impeller with a NPTQ270 motor, 2.7 total horsepower motor.
If you want that impeller, get the NPTQ225 motor.
You won't get the energy savings of using the largest total horsepower motor/impeller combination and running at lower RPM with the smaller combination, but it would work.
You definitely need the impeller ring to get the pump to work properly. They will function without one, but not well.
SPX3207C impeller, as well as the ones above, needs an impeller screw as well or that results in a leak of water straight into the front bearing of the motor.
- May 3, 2007
- 18,067
- Pool Size
- 20000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
- Larger Impeller PROS
- Larger impellers allow you to operate the motor at a lower RPM for the same flow rate which will reduce the noise of the motor.
- Larger impellers tend to have better pumping efficiencies since the vane width is a little wider and head loss as bit less within the impeller.
- Larger motors used to run larger impellers tend to have better operating efficiency due to the larger gauge wire that is used in the motor.
- Overall efficiency of a pump with a larger impeller and motor should be better than the smaller version although sometimes it is not by much (see chart below).
- Larger Impeller CONS
- The downside of a larger impeller is that it will require a larger motor to operate which tends to cost a little bit more.
Just wanted everyone to know that motor was installed successfully. New impeller with screw and impeller ring arrived. Thank you for all your help!