- Aug 22, 2020
- 5
- Pool Size
- 12000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
HI - I'm in the final stages of my new pool build. My PB increased pump to a 3HP Pentair VSF to ensure the system had enough water pressure/GPM for 2 Pentair Magic Bowls water features and 1 3ft wide rain waterfall feature. Pool is 14 x 29; 11k gallons. A nice selling feature of the VSF pump is its variable speed drive plus the ability to set the pump to a specific flow. So far the pump only operates WITHOUT a pressure limit warning when set to run at RPM's. When setting the pump to a specific flow the pump starts up ok and after several minutes it shows "Pressure Limit" error on LCD screen and the GPM readout drops significantly. Backwashed multi times with no improvement. Pump strainer basket looks ok; clear water no bubbles to indicate air, etc. I have 2 skimmers (2" line) and 3 returns (1.5" line), plus 1.5" line for the magic bowls, and separate 2" line for Waterfall. Total of 5 valves.
I knew I had problems with my PB when he suggested we may have to increase the pump size because of the water features. (We already have a smaller pool running a very nice 3HP VSF pump). PB tells me he is having lunch with his Pentair rep and will run the problem by him. He calls me on Monday and said he spoke with the Pentair rep and has an easy solution. His solution is to put a Tee pvc piple connection after the pump and before the sand filter; run left tee connection to filter and the right back in the main return line bypassing the filter. In my opinion essentially creating an always on RECIRCULATING mode for ~ 50% of my pool water. This solution seems VERY sketchy. I feel it would lead to poor water quality and basically working around a problem instead of solving it. (IMO he just wants to do a quick fix to move on; I fear he may have installed the filter wrong/damaged, etc). Is the filter too large? Am i trying to push too much GPM? Each water feature requires ~ 20GPM (3 water features total). Please see 7 tests cycles below trying both manually setting pump for RPM and setting for a specific GPM.
7 Tests with data:
In 6 of these tests I decided to close the valves on both water features to eliminate that from being a potential issue. All other valves were open.
Test 1: 6:20PM, 82GPM (prog #4). @ 6:30PM pump fell to 67GPM and pressure limit error.
Test 2: 6:30PM, 63GPM (prog #3).
@ 6:35PM held at 63GPM
@ 7:15PM held at 63 GPM
@ 7:23PM fell to 51GPM and pressure limit error.
Test 3: 7:25PM, 82GPM (Prog #4).
@ 7:50PM fell to 21GPM and pressure limit error.
Test 4: 8:10PM, 1700RPM (Prog #1)
@ 8:15 1700RPM, run at 23GPM
@ 8:31 1700RPM, run at 26GPM
Stopped test, no errors on screen.
Test 5: 8:31PM, 2250RPM (Prog #2)
@ 8:45 2250RPM, run at 45GPM
@ 8:50 2250RPM,run/fell to 42GPM
Stopped test, no errors on screen.
Test 6: 8:55PM, opened both water feature valves and manually set pump to 2500RPM.
Stopped test, no errors. 42GPM
Test 7: 9:45AM, 63GPM (Prog #3).
@ 9:50AM fell to 59GPM and pressure limit error. (Water feature valves were turned off for this test).
Alarm Logs show B70030
I would appreciate any technical feedback and/or advice on how to respond to my pool builder on his "TEE connector" before the sand filter. (My gut tells me to push back and watch everything he does)
Thanks!
Brad
I knew I had problems with my PB when he suggested we may have to increase the pump size because of the water features. (We already have a smaller pool running a very nice 3HP VSF pump). PB tells me he is having lunch with his Pentair rep and will run the problem by him. He calls me on Monday and said he spoke with the Pentair rep and has an easy solution. His solution is to put a Tee pvc piple connection after the pump and before the sand filter; run left tee connection to filter and the right back in the main return line bypassing the filter. In my opinion essentially creating an always on RECIRCULATING mode for ~ 50% of my pool water. This solution seems VERY sketchy. I feel it would lead to poor water quality and basically working around a problem instead of solving it. (IMO he just wants to do a quick fix to move on; I fear he may have installed the filter wrong/damaged, etc). Is the filter too large? Am i trying to push too much GPM? Each water feature requires ~ 20GPM (3 water features total). Please see 7 tests cycles below trying both manually setting pump for RPM and setting for a specific GPM.
7 Tests with data:
In 6 of these tests I decided to close the valves on both water features to eliminate that from being a potential issue. All other valves were open.
Test 1: 6:20PM, 82GPM (prog #4). @ 6:30PM pump fell to 67GPM and pressure limit error.
Test 2: 6:30PM, 63GPM (prog #3).
@ 6:35PM held at 63GPM
@ 7:15PM held at 63 GPM
@ 7:23PM fell to 51GPM and pressure limit error.
Test 3: 7:25PM, 82GPM (Prog #4).
@ 7:50PM fell to 21GPM and pressure limit error.
Test 4: 8:10PM, 1700RPM (Prog #1)
@ 8:15 1700RPM, run at 23GPM
@ 8:31 1700RPM, run at 26GPM
Stopped test, no errors on screen.
Test 5: 8:31PM, 2250RPM (Prog #2)
@ 8:45 2250RPM, run at 45GPM
@ 8:50 2250RPM,run/fell to 42GPM
Stopped test, no errors on screen.
Test 6: 8:55PM, opened both water feature valves and manually set pump to 2500RPM.
Stopped test, no errors. 42GPM
Test 7: 9:45AM, 63GPM (Prog #3).
@ 9:50AM fell to 59GPM and pressure limit error. (Water feature valves were turned off for this test).
Alarm Logs show B70030
I would appreciate any technical feedback and/or advice on how to respond to my pool builder on his "TEE connector" before the sand filter. (My gut tells me to push back and watch everything he does)
Thanks!
Brad