Ok...well I managed to get the pool chiller hooked up late Friday night. The pool reached a all time high Friday with a max temp of 96 degrees. That's just 6 degrees shy of my hot tub!!!
It was late so I did not do any fine tuning on the spray bar rotational speed. I checked to make sure it was turning in the recommended range of (7-12), and it was at 7 RPM. When I turned it on at Midnight the water temp in the pool was 94 degrees. The next morning at 7AM it was 89 degrees. It definitely works. Saturday was full sun with a high of 96 and a heat index of 105. I let it run all day and the pool only climbed to 91, so it did a great job of holding the temp down, only a 2 degrees increase from the start of the day temp during stupid hot weather. If left unchecked it would have most definitely hit 95 or 96 again.
During the day Saturday I played with pump speed and spray bar rotation speed. The instructions say if you have a variable speed pump you must run it on high, I did not find this to be true. I do have a big pump and a great flow rate, but I don't even have to run my pump at even 3/4 speed to get max spray bar rotation of 12 RPM's.
Here is a breakdown on the output it creates:
- - The water coming out of the return in the pool was 81 degrees with 94 degree pool water (tested Friday night, air temp 89 or so with high humidity, 7 RPM spray bar speed).
- - With the spray bar rotating at 7 RPM's the water from the chiller to the pool runs for 1 minute and 20 seconds with 40 seconds of downtime.
- - With the spray bar rotating at 12 RPM's, the water from the chiller to the pool runs for 2 minutes and 43 seconds with 32 seconds of downtime.
So it does make a big difference of the quantity of chilled water with spray bar speed settings. I did not test the output temp of the water after I ramped up the spray bar rotation. It feels about the same...just runs twice as long more often. I will test it at some point.
So Saturday night after getting the spray bar optimized it dropped the water temp overnight to 86 degrees at 5AM Sunday morning. YAY!!!! That was with a shorter runtime than Friday night. I personally don't want it any cooler than that and the wife had rather have it at 90. The weather Sunday was clouds with sun and a high of 89, so I did not run it at all Sunday or Sunday night. It's cloudy and raining today.
If you look at the above picture, you will see that I used one of my returns for the chiller. I added an actuator to the supply valve so I could run this completely with my automation. Since my pad is below the water line I had to put a shutoff on the line back to the pool for maintenance reasons. If you look at the top supply line to the chiller (red) and the bottom return line from the chiller (black) you will notice grey schedule 80 unions. I put these here so in the winter I can remove these sections of the lines to blow out the lines to the chiller. I will also hook up this short connector (pictured below) that I built so that line once again becomes a normal return to the pool and water will flow through it so I don't have to worry about freezing. I don't "close" my pool in the winter, so the pump needs to run in below freezing conditions to keep things from freezing.
I also learned the Jandy check valve does not function like I expected. I put it in so that water from the pool would not flow into the chiller's basin when the chiller was not running (pool higher than pad). This works as expected if and only if the water level in the basin is low at the time of the shutdown. If the chiller basin is nearly full, ready to be pumped back into pool, when the chiller turns off, the weight of the water in the basin is enough to hold the valve slightly open..but since the water in the pool is higher than the water in the basin, the pool water flows past the open check valve and causes the water in the chillers basin to raise and overflow. To fix this I added and inverted U in the return line at the pad. The top of the U is above the water line for the pool and the chiller...so this stops the flow of water from the pool to the basin regardless of the depth of the water in the chillers basin.
All and all, I am pleased with it. But go figure as soon as I get it installed, the weather this week shows highs in the 88-92 range with lows in the 68-72 range...so I don't know if I will even need it this week.