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Thread: 3/4 whisperflo shutting off

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    3/4 whisperflo shutting off

    I have a 18x30x4' deep soft sided pool. we decided to change out the pump since our old one was screaming already. I got a killer deal on a 3/4 hp whisperflo. I noticed a drastic increase in my flo and skimmer suction whoa! My old pump was a above ground waterway pool/jetted 1 hp plugged into a 110 gfi recepticle 2' away. My new pump runs for 3 mins. And than shuts off. I checked the volts at both the pump and 117v @ panel 120v. The amps at the pump read very high which is why i assume its heating up and shutting off. The start at 10 and climb slowly till it reaches 14.7-15 amps and off it goes. The breaker does not trip or my gfi recepticle. I changed out the wiring to #10 still same. The run from panel and recep. is 70'. That wiring is #12 w/ 20 amp breaker leading to the 15 amp gfi recept. I have also checked the return and skimmer for obstructions. What else can i check and or why is my pump drawing so many amps? I have triple my pump wiring to ensure it is at correct voltage.
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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    Mod Squad JohnT's Avatar
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    Re: 3/4 whisperflo shutting off

    You'd get that kind of behavior if the impeller was too large for the motor. Is the pump new?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: 3/4 whisperflo shutting off

    Yes, and unfortunately i forgot a big part of this. I just checked the service factor on both. i received this pump free along witb a new motor but it is a uprated one with. The new motor is a total of .97 while i am using a wetend from a energy efficient 3/4 which on the label would total 1.25. This would mean a 1hp impeller would fix it? So this will explain my scenario?
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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    Guest

    Re: 3/4 whisperflo shutting off

    Are you sure that's not a 220v pump?

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    Re: 3/4 whisperflo shutting off

    its 115/220 and is wired at 110. Correction on my above post i would just need a 1/2 hp impeller not 1 hp?
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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    JasonLion's Avatar
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    Re: 3/4 whisperflo shutting off

    You need an impeller that matches the motor. There are a couple of different ways the motor might be labeled, which you need to match up to how Pentair labels their motors to figure out which impeller size matches. The listed HP times the SF gives SFHP, which needs to be matched up to a specific Pentair model's SFHP to find a corresponding impeller.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: 3/4 whisperflo shutting off

    Ok plate on just wetend is 3/4hp and 1.67 sf totaling 1. 25 sfhp. The new motor is 3/4 hp with a 1.30 sfhp totaling .97. I would need a wf2 or wfe2 1/2 hp impeller. I also should mention that i have only 20' of head with a waterway fc100 cartridge filter 1.5" plumbing, 1 return,1 skimmer.
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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    Re: 3/4 whisperflo shutting off

    Just got the impeller today to match the motor. It started very well. I thought problem was fixed when 15 minutes later it shut off again. I also removed the 3/4" eyeball from the return and filters psi drops drasticlly to 10 psi. It will also run for 45 minutes this way before shutting down.
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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