Hi all,
After a somewhat (very?) confusing series of chats with Pentair I would appreciate your thoughts, advice and comments regarding the selection of a pool pump based on the attached diagram and the following specs.
Pool Specs:
-basically two AGPs: one oval (the "shallow end") "joined" with one round (the "deep end").
-finish - commonly available, stock vinyl liners (joined as one would for on-site liner installations).
-walls - ferro-cement. Buried to deck/patio level.
-circulation: 1 rim level drain/filter/sump; 4 wall returns installed 6" above floors.
-specs: 18'x66" round; 10'x16'x18" oval; volume=12,000 gal (approx); GPM=25 (8 hour turnover)
-power: 115 volt; utility cost - $0.33+ per Kwh; ENERGY EFFICIENCY very important. Plan to go off-grid.
-pump location: any elevation between pool floor and surface; about 10-12 feet from pool.
-plumbing: 2" and/or 1.5" depending on TFP input.
First, a bit about my chats with Pentair. Living off the beaten path on the Pacific coast of Nicaragua I use a micro-wave link for internet service. We use Skype for making calls and because or link was cutting out over several days my calls to Pentair for their suggestions would cut off suddenly and, as it turned out, I could never re-connect with the same person. The result, talked with four people and received four answers.
Pentair's suggestions:
1-Dynamo 2 speed, .75HP, but concerned that with 4 returns there wouldn't be sufficient pressure/flow for adequate circulation.
2-Dynamo 2 speed, .75HP, reducing plumbing to 1.5" or 1" would help???
3-Dynamo 1 speed, 1HP, should work
4-Whisperflo 2 speed 1HP (115V), but would be probably be overkill for pool volume and flow (GPM).
Having read a number of the threads on the economic and energy saving advantages of two (and variable) speed pumps they are definitely the route I wish to go (particularly at $0.33+/Kwh and future plans for being totally off-grid). Although the Dynamo (.75HP/2 speed) running on its' low speed (at 115V & 2.6 Amps) seems very energy efficient for the volume that I have (12K gal), would it be suited to the plumbing (friction loss) and number of returns (4) that I would like? Is any model of Dynamo suitable at all? I'm also not stuck on Pentair (was just a starting point). Other suggestions and recommendations welcomed. Thanks.
P>S> Click on diagram for a larger, clearer view.
After a somewhat (very?) confusing series of chats with Pentair I would appreciate your thoughts, advice and comments regarding the selection of a pool pump based on the attached diagram and the following specs.
Pool Specs:
-basically two AGPs: one oval (the "shallow end") "joined" with one round (the "deep end").
-finish - commonly available, stock vinyl liners (joined as one would for on-site liner installations).
-walls - ferro-cement. Buried to deck/patio level.
-circulation: 1 rim level drain/filter/sump; 4 wall returns installed 6" above floors.
-specs: 18'x66" round; 10'x16'x18" oval; volume=12,000 gal (approx); GPM=25 (8 hour turnover)
-power: 115 volt; utility cost - $0.33+ per Kwh; ENERGY EFFICIENCY very important. Plan to go off-grid.
-pump location: any elevation between pool floor and surface; about 10-12 feet from pool.
-plumbing: 2" and/or 1.5" depending on TFP input.
First, a bit about my chats with Pentair. Living off the beaten path on the Pacific coast of Nicaragua I use a micro-wave link for internet service. We use Skype for making calls and because or link was cutting out over several days my calls to Pentair for their suggestions would cut off suddenly and, as it turned out, I could never re-connect with the same person. The result, talked with four people and received four answers.
Pentair's suggestions:
1-Dynamo 2 speed, .75HP, but concerned that with 4 returns there wouldn't be sufficient pressure/flow for adequate circulation.
2-Dynamo 2 speed, .75HP, reducing plumbing to 1.5" or 1" would help???
3-Dynamo 1 speed, 1HP, should work
4-Whisperflo 2 speed 1HP (115V), but would be probably be overkill for pool volume and flow (GPM).
Having read a number of the threads on the economic and energy saving advantages of two (and variable) speed pumps they are definitely the route I wish to go (particularly at $0.33+/Kwh and future plans for being totally off-grid). Although the Dynamo (.75HP/2 speed) running on its' low speed (at 115V & 2.6 Amps) seems very energy efficient for the volume that I have (12K gal), would it be suited to the plumbing (friction loss) and number of returns (4) that I would like? Is any model of Dynamo suitable at all? I'm also not stuck on Pentair (was just a starting point). Other suggestions and recommendations welcomed. Thanks.
P>S> Click on diagram for a larger, clearer view.