Atman chiller 400 CIRV

[Eric]

Hi guys, I have been using the ATman 400 chiller for 3 weeks now. The performance is not bad, cooling quite fast for my 300L tank. But one thing I not so happy is the compressor cut in is set at + 1 degree C, which means if I set the temperture at 24C, once it raises to 25C the chiller compressor will cut in to cool the water down to 24C. I'm using 2 x 250W MH, this means for every 3mins max, the water will raise from 24C to 25C which then cuts in the chiller. This is not very cost effective..........does anyone knows how to adjust or reset the temperature cut in to + 2C or 3C ?

Have a fren modified the chiller by adding a themostat sensor to overriding the chiller and cut in at 28C, cut out at 25C......very effective but need to spend another $200 for the modification plus warranty will be void.......so I'm looking for other alternative.

[weileong]

3 mins to raise 1 degs?

How long does it take to cool down 1 degs then?

How do you configure the intake to the chiller and outlet from the chiller?

[Eric]

3 mins to raise 1 degs?

How long does it take to cool down 1 degs then?

How do you configure the intake to the chiller and outlet from the chiller?

It takes also abt 3mins to cool down the water from 25C to 24C. Configuration is just sump compartment 2 with a powerhead (2000L/hr) to chiller inlet and chiller outlet back to same sump compartment 2 which also pumps the water up to the main tank by the eheim.

I'm testing on using a lower flowrate PH now to drive the chiller inlet so as to allow more time for heat exchange, maybe that will shorten the run time.

[Eric]

Just adjusted the chiller outlet flow by half & re-route the outlet to my first compartment(mechanical filter) for extra filteration & now it takes 2mins 15s to drop from 25C to 24C but only maintain for 3mins 5s before the chiller cuts in again. Improvement on the time taken to cool down by 45s.

If can reset the cut in to + 3C would be great........electrical and electronic engineers.........pls help!!!

[Jun Hong]

Hi, Eric,

I think you have somehow short circuit the water to be chilled. Just imagine the amount of water in the sump compartment 2 is much smaller than the whole tank water volumn, so you chiller take very short time (you mention 3 mins) to bring the temp down by 1 deg and cut off. When hotter water flow into the sump will again bring out the temp quite quickly by 1 deg so the chiller will start again! And the cycle never stop.

So I suggest you connect the output of the chiller to the main tank.

[Eric]

Hi, Eric,

I think you have somehow short circuit the water to be chilled. Just imagine the amount of water in the sump compartment 2 is much smaller than the whole tank water volumn, so you chiller take very short time (you mention 3 mins) to bring the temp down by 1 deg and cut off. When hotter water flow into the sump will again bring out the temp quite quickly by 1 deg so the chiller will start again! And the cycle never stop.

So I suggest you connect the output of the chiller to the main tank.

ok, will try that ....thanks!