Pool Opening Problems.

[mas985]

Looking back over the thread, one thing I neglected was that you have a top mount filter with a backwash valve. Those valves tend to have fairly high head loss and half of that is before the filter gauge so it is not part of the filter pressure. Anyway if I include that and the suction side plumbing setup including the 3-way valve, here is what I get as an operating point:

Flow Rate (GPM) 69
Head Loss (ft) 65
Energy Use (Watts) 1,839
Energy Factor (Gallons per Watt-Hr) 2.26


Here is the break down of head:

Suction plumbing: 6' = 4' of dynamic head + 2' of static head
Pre-filter backwash valve (1/2): 10' dynamic head
Return plumbing: 49' = 51' of dynamic head - 2' of static head

Hopefully everything is included this time. If you want any more accuracy, you are going to have to take a suction measurement at the pump.

[TheGoose]

Thanks for your info.

Here's an interesting tid-bit: The low speed amperage is right about 1.0 amp as measured with my digital amp-probe. The full speed amps are ~7 if I recall. I know for a fact that the low speed is 1.0 amps, I measured both legs because that sounded too low.

Thoughts?

[mas985]

The CEC measurements for the Whisperflo show low speed power about 24% of high speed power so that is what I would expect. I would be very surprised in the 1 HP Whisperflo only drew 1 amp on low speed. Are you sure you are not running into any accuracy issues with the amp meter? Can you confirm with the house power meter?

[TheGoose]

I'm thinking that since I have the pump restricted back and thus the flow lowered that the amps are lower.

As far as accuracy I think the meter is close.

Here's the specs:
HP - 1~.13
RPM - 3450/1725
Volts - 230
Service Factor Amps - 7.4/1.4
Service Factor - 1.65
Frame - 56Y
Shaft - Threaded
Overload Protector - Auto
Length Includ. Shaft - 13.4


So I think ~1 amp is right on the money if the flow is restricted back.

[TheGoose]

Also I pulled the top off the filter and installed a union. I added 1.5 bags of sand but I really didn't notice the level being low. In fact it was actually quite high. I put about ~75 lbs in just for good measure. I did notice my starting pressure being slightly higher, about 22 psi instead of ~19-20. Will wait and see.

[mas985]

I'm thinking that since I have the pump restricted back and thus the flow lowered that the amps are lower.

I don't remember you saying anything about this. How have you restricted the pump?

Also, I noticed from the picture that you may have one of the suction lines closed. Is that the case and if so, is the 20 PSI clean filter pressure when that port is closed?

Also, what was the model # of your original pump (e.g. WF-4 or WF-24)?

All of these things can make a big difference in the operating point of the pump.

[TheGoose]

The pump was restricted some by the extra DE in the filter (added per this site)....had it at about 26-28 psi. I heard that a plugged filter actually filters better. Normally I would backwash at this pressure but nothing else seems to work. I was actually running on low speed at ~10 psi, but the filter was close to needing backwashed.

I run with the main drains closed so the skimmers will function better. I have dual main drains with the upgraded covers so it's not really a safety issue. I have a lot of over hanging trees etc. and I need as much skimming as I can get.

The original pump is a WFE-4.

I don't remember you saying anything about this. How have you restricted the pump?

Also, I noticed from the picture that you may have one of the suction lines closed. Is that the case and if so, is the 20 PSI clean filter pressure when that port is closed?

Also, what was the model # of your original pump (e.g. WF-4 or WF-24)?

All of these things can make a big difference in the operating point of the pump.

[mas985]

Ok, I think I understand. The amp measurements were made with the higher pressure but your normal pressure is 20 PSI. Correct? Also, 20 PSI is with a clean filter and one suction port closed, correct?

But I don't believe it is possible for that pump run on low speed at 10 PSI. Max head for that pump on low speed is 22' and 10 PSI would put it well over that including gauge height. Also, if the filter was reading 27 PSI on high speed, it should have read somewhere close to 5 PSI on low speed. So either there is a problem with the pressure gauge or you did not read it correctly.

[TheGoose]

You're actually correct. The gauge is ranged to like 60 psi but really should only range to 30 psi for better accuracy.

At low range it's running under 10 psi, I believe about 6 psi. When the filter is plugged and the pump is reading about 26-28 psi on high speed it doesn't really change low speed pressure as much. Low speed is still under 10 psi, I believe about 6-8 psi but I haven't looked at it real close. Now that I think about it 6 psi is probably about right.

I was just rounding to 10 psi but it is definitely under that.

Thanks for all your help.

[TheGoose]

Blue White flow meter in hand. We'll know soon enough about my flow.