planning to replace with 2 speed pump

[seraph]

Good day!

I am planning to replace my current single speed pump to 2 speed.

Pump is on for 8 hours per day, and meter shows around 25 kwh daily. since I haven't moved in yet, so assume 80%+ are consumed by pump alone. rate: 0.10-0.11$/kwh.


Current pump: 2 hp, 230v, 10.5 amp, inlet horizontal, outlet vertical.


After reading the articles, I suppose the 2 speed pump suits better.


Considering myself as weak DIYer, may I have your advice on a few queries?
1. what is the right power for the pool? 1 hp, 1.5 hp?
2. how difficult is the plumbing to replace the pump?
3. current voltage is 230, so electric wiring should be easy part, am I right?

Pool info: 14000 gallon pool with SWG, I don't think there is heater involved.

 

[callahan3]

just off the top here 2hp seems a bit much what type an size filter u have?
plumbing is not to bad use threaded couplings so you can take apart later when needed with out cutting the pipping again.

 

[seraph]

Thanks for the response.

Filter size is 60 sqft. Can I replace current motor with 1 hp or 1.5 hp?

If I change to 2 speed pump, do I have to change the whole pump?

 

[CJadamec]

Can you get a shot of the wet end of the pump or any name information on the pump it will help in answering your questions. The name tag on the motor is just for the motor it doesn't tell us what pump you have. Also is your pool in-ground or above ground?

You can do just a motor change to get a 2-speed pump.
Don't undersize the motor for the pump impeller you have.

 

[seraph]

I've uploaded the picture below due to size limit.

https://s8.postimg.org/drof647d1/IMG_6145.jpg

My pool is inground one.

I did some calculation:
- GPM = 14000/60/8=29
- filter shows 15 PSI, So foot of head = 15*23.1=35. Am I right?

Refer to some online table, 0.75 hp or even 0.5 hp is enough?
http://www.inyopools.com/swimming-pool-calculations.aspx#horse_power

If yes, I can change to 0.75 hp pump, which can be done with simpler wiring.

 

[kevreh]

Putting on a new motor is easier since you wont need to mess with plumbing. You need to figure out the bolt pattern so the motor matches the "wet end" of the pump.

 

[seraph]

Thanks for the advice. I can see the fame of motor is X56J, but I couldn't find information about my pump.

Can I just use the frame to decide whether motor matches the wet end?

Not sure whether it is possible to tell from the photo.

 

[seraph]

Finally I found this article:
7 Biggest Mistakes When Replacing a Pool Motor

From above, I guess my pump is hayward super 2.

Then I found below compatible motor:
Hayward Super II Motors - INYOPools.com

And seems it needs addtional switch also.
A.O. Smith 1-1/2 HP Round Flange Dual Speed Full Rate Motor (STS1152R) - INYOPools.com