We have a 16,000 gal pool about 20 yrs old. The pool has 1.5" plumbing. The original pump was a Pac Fab Challenger looking pump, I don't remember the exact model. I think it was 1 HP. It worked like a champ until Katrina flooded it out. Bought a Hayward maxflo (2810x15). Lasted less than two years...the motor is not fully functional (one of the starting contact switches broke...tried to glue, broke again.., I can hot wire start it, but really dangerous, tired of dealing with it and getting shocked... anybody know where to find schematics or spare parts for these motors?) No luck fixing it, so looking at new pumps.
With the Maxflo running, the pressure on the filter (Tagelus 60 sand filter) reads about 18-20 PSI. I run a Polaris 360 pressure side sweep, no booster required.
Looking at new pumps. I like the Pentair Whisperflo. The single speed, full rated, energy efficient models. Should I go with 3/4HP (WFE-3) or 1HP (WFE-4). From reading the pump curves, I can see both of these can pump much better than the old 1.5HP hayward.
Would I run into trouble using a pump with 2" suction and discharge and using reducers to adapt to my 1.5" plumbing?
I realize the pump will not run to its full potential, but will the curve just back off or do I risk damaging a motor like this?
Since the pipe size difference will affect the head, how then to predict what my flow may be with a new motor/pump?
Thanks in advance.