Hooking up new 2 HP pump

[ctowsley1]

I had to purchase a new pump this year, and in picking one I was assuming a 2 HP is just going to be be better than our old 1.5 HP and work faster. I went to find a reducer that would go from the required 1 1/2” schedule 40 or flex pipe inlets and outlets in the new pump to a standard hose size which is what we have always used for our set up. I was informed at the pool store I would probably run into problems reducing it that much with a 2 HP pump. And that it also might be too powerful for my sand filter. Looking for advice on the best way to hook this up. I can change out and use the larger flex pipe hoses instead of standard and take out these hose adapters. But will my sand filter handle it? Or, if I reduce it anyway will it burn up this pump? Help!

 

[Texas Splash]

I'm not familiar with that pump. I see settings for run time, but can you adjust the rpm as well?

 

[ctowsley1]

I'm not familiar with that pump. I see settings for run time, but can you adjust the rpm as well?

No, it’s single speed.

 

[Texas Splash]

single speed.

That could be a problem. But hydraulics isn't my area of expertise, so I'll tag @mas985 for his thoughts.

 

[mknauss]

Look for another tag on it. It must be de-rated to be legal to sell.

 

[ctowsley1]

Look for another tag on it. It must be de-rated to be legal to sell.

A tag on the pump? I should also mention it’s a 200 lb sand filter if that matters.

 

[mknauss]

Yes. Should show THP, WEF.

 

[1poolman1]

I had to purchase a new pump this year, and in picking one I was assuming a 2 HP is just going to be be better than our old 1.5 HP and work faster. I went to find a reducer that would go from the required 1 1/2” schedule 40 or flex pipe inlets and outlets in the new pump to a standard hose size which is what we have always used for our set up. I was informed at the pool store I would probably run into problems reducing it that much with a 2 HP pump. And that it also might be too powerful for my sand filter. Looking for advice on the best way to hook this up. I can change out and use the larger flex pipe hoses instead of standard and take out these hose adapters. But will my sand filter handle it? Or, if I reduce it anyway will it burn up this pump? Help! View attachment 493550

According to the pump label, it will try to move 148gpm. Probably not realistic, but could be around 100. Your filter is rated at 37gpm. Water will try to bypass the sand bed and a backwash can result in a lot of lost sand, 28gpm max flow rated. The math doesn't work.
Do you have 220V (240) at the equipment pad? The label indicates this is 220 only.

 

[mas985]

I had to purchase a new pump this year, and in picking one I was assuming a 2 HP is just going to be be better than our old 1.5 HP and work faster.

Work faster? What are you trying to "fix"?

In general, you want a pump to actually work slower (i.e. lower flow rates) which result in better filtering and a cleaner pool. Higher flow rates really don't benefit you that much unless they are running spa jets, water falls or high flow water features.

But will my sand filter handle it? Or, if I reduce it anyway will it burn up this pump? Help!

The pump won't "Burn Up" but it will be much less efficient. Again, smaller pumps result in lower flow rates, better filtering and are much much more efficient.

As for the filter, that is again, more beneficial to slower flow rates and smaller pumps. If there is a chance to return the pump, that is what I would do.

That pump will probably deliver around 60 GPM on that plumbing and with that filter.

 

[Darin]

If you are stuck with the pump, install a valve on the discharge side before filter and pinch it back at least half way. This does not hurt you motor and you will decrease the flow to filter. You will also use less electricity.
The important thing is to never run it wit the valve all the way closed. This is called deadheading and it will eventually lead to motor bearing failure due to excessive heat.