Replacing Hayward pump How many things to consider when you want 2 speed motor?

SPCT

New member
Apr 13, 2017
3
CT
#1
Hi all,

Looking for some help. My pool is a simple, in-ground, rectangular 32X18, 16,500 gallons and about 4.5 ft at deepest section. Pump and filter are within 6 feet of pool and only one skimmer line. No heater or anything fancy. Sand filter is Sta-Rite S7S50. I have an old Hayward pump model C48k2n143b1. It is single speed, 1 HP, .75kw 115/230v, 56J. I inherited it from buyer two years ago but guessing it is pretty old. I still runs ok but I really want to upgrade to more efficient motor, maybe a two speed. I live in CT and pool season is only three months but our electric rates are through the roof about .18 -.19 per KW. Trying to keep costs down but really struggling to find a replacement motor. Here are my concerns:

-Whoever built the pool installed a 125v line so I can't do 230v pump without electrician coming in (which I really want to avoid at this point). It is one of those 3 prong twist outlets. No idea why he did it.
-So, this limits me to 115v pumps and I can't find any direct replacements that are two speed? The closest appears to be AO Smith B973 but my concern is that there is no switch to change the speed setting? How can you do it without a switch?
-Seems like I am forced to buy total new pump for $600-$700 or change electric line? Should I just suck it up and pay $1000 for variable speed?

Also, I see this pump - Pentair 340204, 1HP, 2 Speed, 115V, Self Priming, with a Diffuser. It says above ground use but a few reviews say that it can be used inground. My set-up is simple and equipment only a few feet from pool. It won't be pulling water through many feet of pipe. It even states in specs that you can pull up to 8 feet above water line. Am I missing something? Seems like great, cheap replacement at $250.
 

Chemnut

In The Industry
Apr 5, 2017
231
Maine
#2
Hook up a simple timer to run the existing pump 8-10 hours daily. The electricity to run a single speed that length vs a variable speed or two speed over 24 hours is almost the same. A simple Xmas light timer costs around $20
 
OP
OP
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SPCT

New member
Apr 13, 2017
3
CT
#3
Hook up a simple timer to run the existing pump 8-10 hours daily. The electricity to run a single speed that length vs a variable speed or two speed over 24 hours is almost the same. A simple Xmas light timer costs around $20
Not following. Why would I have to run pump 24 hours. My calcs shows 6-8 a day max to turn over 16500 at 1725 RPM.

Anyone know if I can use Pentair 340204 for inground pool?

Thanks
 

Sammy2

Well-known member
Aug 30, 2016
378
Riverside, CA
#4
Verify your pool size. At 18' x 30' x 4.5'/2 (average depth?) x 8.4 gallons/CF it is only about 11k gallons.

You may want to look into local utility rebates for VS pumps in addition to the $50 rebate Pentair has on VS Pumps in the price comparison with the one you're considering.

I may be wrong. I have been before.
 
OP
OP
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SPCT

New member
Apr 13, 2017
3
CT
#5
Verify your pool size. At 18' x 30' x 4.5'/2 (average depth?) x 8.4 gallons/CF it is only about 11k gallons.

You may want to look into local utility rebates for VS pumps in addition to the $50 rebate Pentair has on VS Pumps in the price comparison with the one you're considering.

I may be wrong. I have been before.
Not sure where your calc comes from but I can assure you it is about 16,500 ie L x W x avg depth 1 X avg depth 2

It was even written on two water test bottles when I bought house.
 

Sammy2

Well-known member
Aug 30, 2016
378
Riverside, CA
#6
I'm sorry. I was wrong. It is only 7.48 cf/gallon so 18' x 30' x 2.25' x 7.48 gallons/cf is less than 10k gallons and as I've learned on TFP you don't need to turn over the whole pool every day.