Abyzz Help

[marinelife]

I had the Abyzz off all day with no change to the temp.

Will have the RD3 off tomorrow to see what happens

[gcarroll]

Originally Posted by ksed

Are the Reeflo pumps water cooled?

Quite the contrary. They are air cooled and have minimal heat transfer as the only thing that could even transfer heat from the motor is the shaft. I would be hard pressed to beleive that a water cooled pump ran cooler unless there was some other mitigating circumstance.

Here is a pic of a reeflo and you can see how the housing is separated from the motor thus preventing heat transfer.

[slief]

Originally Posted by gcarroll

Quite the contrary. They are air cooled and have minimal heat transfer as the only thing that could even transfer heat from the motor is the shaft. I would be hard pressed to beleive that a water cooled pump ran cooler unless there was some other mitigating circumstance.

Here is a pic of a reeflo and you can see how the housing is separated from the motor thus preventing heat transfer.

The impeller housing on the Super Dart is much closer to the motor than the Hammerhead shown in your photo. You also have the metal shaft spinning in the seal on the housing which likely creates some friction. Then there is whatever heat is transferred through the shaft to the impeller. At one time I was running a Hammerhead Gold for my return pump. When I swapped that out for a Superdart Gold, my temps dropped there too. The Superdart gold had a draw of about 187w according to my Kill-A-Watt. The RD3 230's that is on my return pump is running at 150w.

The RD3 dissipates most of it's heat through the controller. It's a much higher voltage but lower current to the motor than traditional DC pumps. You and I have had that conversation before. As such, heat transfer from the RD3 is minimal due to much lower current to the motor. Next time you are at a friends house who runs an RD3 230 externally, put your hand on the block and see how cool it runs. The motor on the Superdart ran pretty hot. The RD3 runs at Ambient temp on my system.

[ksed]

Slief, did you happen to measure the water temperature at the input and output at or near of the volute on the Reeflo?

[ksed]

From my understanding is that if a pump has 230w of energy going to it that’s the amount of heat it will produce? Is this correct? Regardless of how a pump is being cooled.

[slief]

Originally Posted by ksed

Slief, did you happen to measure the water temperature at the input and output at or near of the volute on the Reeflo?

I never measured the temps on the pump itself. The motor was hot to the touch and the temps dropped by 2 degrees when I made the switch.

Originally Posted by ksed

From my understanding is that if a pump has 230w of energy going to it that’s the amount of heat it will produce? Is this correct? Regardless of how a pump is being cooled.

With standard AC pumps that is often the case though air cooling, motor mass and other factors impact how much of that wattage is transferred into the water in the form of heat. This is why a pump like a Reeflo runs cooler than a comparable wattage Iwaki. Most DC pumps run at 12v or 24v. The Vectra runs at 36v if I am not mistaken. Many DC pumps also transfer most of the wattage to the motor to power the block. The RD3 230 and RD3 150 motors run at a MUCH MUCH higher voltage but the motor itself also draw much less current and a lot of the actual wattage is used/dissipated in the controller.

On the RD3’s you also have the AKB which feeds cool water from the pressure side through the motor block into the magnet cavity so that is also another reason why these pumps tend to run pretty cool. Don’t get me wrong, at 230w full power, there will be some heat generated at the motor but its not as much as you would think because not all 230w is going to the motor itself. I’m sure you have read some of the comments on other DC pumps (not mentioning names) running really hot compared to other DC pumps. Especially when run externally. Point being that different designs result in different temps through the pump regardless of the total wattage.