Intermatic Pool Timer Wiring

[sjeffers01]

I agree that buying a new pump is better than paying for a new 2 sp motor. It costs more than a new pump to replace the motor because I would have to buy some other parts to install it. I checked out the Hayward SP15922S and it is 1 Hp. The Pentair Whisperflo pump I have is 3/4 HP and it is too big for my 8190 gal pool. Would a 1 HP be ok or should I look for a 3/4 HP 2 speed pump?

[mas985]

Actually, the Whisperflo is a larger pump than the Matrix. You can't always go by label HP when sizing a pump, you have to compare head curves for a true measure of a pump's power. For example, on typical AG pool setup, the Whisperflo will deliver about 53 GPM but the Matrix will deliver only 50 GPM.

[PoolDoc]

What he said.

You could use a smaller pump, but as far as I know, an above-ground 3/4 HP with 2 speeds is not available.

[sjeffers01]

You are correct about the 2 speed 3/4 HP for above ground pools but they are available for in-ground pools. I bought a used above ground pool that came with an in-ground Pentair Whisperflo 3/4 HP (WFE-3 single speed) pump.

[sjeffers01]

I looked at the wires coming from the pump and they are thinner than the wires that I used to supply power. I have a GFCI outlet and added a 15A 125V three pronged plug to supply power to the Intermatic Pool timer and pump. If you look at the first or second page of this post you can see a picture of the wiring for the Intermatic. The wires from the pump are blue, blue, and white. The blue wire has 12 AWG and the wires that supply the power to the timer are for 15 amps 125V and are thicker. Would the smaller wire coming from the pool pump cause the overheating problem?

[mas985]

Possibly if the voltage drop was significant. But if the wire size is at least 14 gauge, that is sufficient for that pump.

http://www.pentairpool.com/pdfs/WhisperFlo%20OM.pdf

[sjeffers01]

So if I understand how wire size works, the 12 AWG is okay because it is bigger than 14 AWG? The distance from pump to timer is about 6 ft. I haven't had a chance to test the terminals with a multi-meter but I don't think there is a problem with the voltage. I will visibly check the wiring on the pump to see if it is wired correctly. My handyman isn't available to help me, so I will have to do it myself.

[PoolDoc]

Would the smaller wire coming from the pool pump cause the overheating problem?

If those wires were large enough to operate the pump successfully in the past, they are probably still large enough now. If you want more specific info, you need to check actual wire gauge.

[sjeffers01]

I guess I was hoping for a simple solution to fix the over heating problem. I am going to run the pump until the new one arrives. I set the tripper pins on the timer to run early morning for 2 hours, late afternoon 1/2 hour, and for 2 hours at midnight. I go swimming in the late afternoon so I can shut the pump off if it gets too hot. The other tripper pins are set to run during the coolest periods. I hope the new pump runs as quiet as the Whisperflo. I may have a licensed pool technician check the wiring and the rest of the system. I have to review my options and decide the best way to go. Thank you for your assistance. If any forum subscribers have had the same problem of overheating that was not due to issues with the main breaker or GFCI, it would be interesting to see what was done to identify and fix the problem.

[mas985]

Have you inspected the impeller and diffuser? Any obstruction would cause the motor to overheat and trip the thermal sensor. Also, I don't think you ever answered my other question about pump noise. Is is screeching or whining?