I have a 15,000 gal inground with a Whisperflow pump with 1/2 hp motor & sand filter with Master Temp 400 propane heater. We are located 250 ft from the Gulf of Mexico. The motor was going into its 5th year of service when it seized. Up to that point the motor always performed well with no problems. We have 1 1/2 inch water lines.
My pool person installed an Intelliflow motor and control to the existing Whisperflow pump.
First problem was that the pump would not prime at the prime RPM of 3250. It sucked the water out of the lines too fast, according to the installer. He said that the lines should be 2" and not 1 1/2". He then reduced the Prime speed to 2400 RPM. This allowed the pump to prime each morning. OK, we seem to have the problem solved, except, the pump will not fill the "bowl" and maintain flow unless the constant speed is 2350 RPM. Additionally, the heater will not remain "on" unless the 2350 RPM is maintained to keep the water flowing.
Pentair Factory Rep has agreed that the 2350 RPM is probably necessary to maintain flow. My question is, do I really need an Intelliflow if I must always run it at 2350 RPM's....I'm sure my savings is greatly diminished. Should I go back to a single-speed?
I have the Intelliflow on two other inround pools with no problems. They run at 3250 rpm for prime and 900 rpm for normal operation.