... about my CW-5000

I was wrong in thinking that there was any intentional wrongdoing at work from anyone when my CW-5000 behaved strangely.
It's a brilliant machine, and you really have to understand how it works to appreciate it.
So here's my apology video with that information. My unit is just plain broken.
If you like what you see, and want to help out making this sort of development and production possible in the future, please consider a small donation at:
www.paypal.me/dherrendoerfer
This helps a lot in keeping the channel and its content free and un-influenced.

[@gordoncouger9648]

I'm late to the game, but if I remember right opening the bypass valve before starting the compressor will lead to longer compressor life. Since you are [programming the chiller controller and using its output you should be able to make a good deal better power cycle thane than the generic one that came with the chiller.

[@dherrendoerfer]

You are perfectly right - and that's exactly what I did when starting up

[@skysurferuk]

Very interesting, thank you.

[@djoul7843]

Hi ! Thank you for this vidéo. I think i have the same problem but my compressor never stop. I just put the hysteresis 2°C down and i stop the compressor mannually by changing mode. Maybe you have a better soluce ?

[@dherrendoerfer]

My best advice is to start by adding an extra temperature probe to the water tank and checking how cold the water really gets. If it does not get to 15 degrees or below then there's probably something wrong with the cooler.
Does your CW5000 go into the 'hissing' mode and then it just stays there ?

[@djoul7843]

@@dherrendoerfer Thank you for your answer, my cw-5200 cools normally as long as the solenoid remains closed. When it opens the temperature rises. The problem is that the compressor does not turn off automatically.

[@dherrendoerfer]

That's exactly the same issue I had with mine, and I believe it is intentional - The maker of the unit uses the open bypass to control the temps, instead of going through a full on-off cycle.

[@djoul7843]

@@dherrendoerfer Ok thank you very much, what is strange is that before the compressor stopped once the T°-2 reached (hysteresis on 0.8°C) and all of a sudden it does not stop anymore. With 35°C in the workshop, it gets hot, so I turn it off by fiddling with the F3 menu, the temperature rises more slowly and the compressor doesn't overheat. This is the only solution I have found so far.

[@dherrendoerfer]

What is your target temperature ? At 35degC ambient the cooler might simply have too much load to reach the target temp.

[@bruceadler-9410]

in your diagram the lefthand connection of the bypass valve doesn't look correct. shouldn't it go to the input of the compressor rather than the output of the compressor? As drawn it bypasses the condenser coils and effectively turns the cooler into a heat pump. There's no situation I can imagine where you want to be heating the evaporator coils.

[@dherrendoerfer]

No, it's actually correct.. since there is no pressure rise in the output of the compressor theres no temperature increase. It just eliminates most of the cooling.

[@bruceadler-9410]

@@dherrendoerfer where's the expansion valve go in your diagram?

[@dherrendoerfer]

I drew it as part of the evaporator in the machine itself it sits between the condenser and the evaporator, and has a capillary tube leading to the evaporator, the bypass joins at the exact location on the evaporator.

[@bruceadler-9410]

@@dherrendoerfer what you've got is called "hot gas bypass". As I indicated, when it's in bypass mode, it actually will pump heat into your evaporator which doesn't seem appropriate to me for this application. I think "cold gas bypass" would be better.
www.achrnews.com/articles/105262-understanding-hot-gas-bypass