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Old 04-22-2012, 03:51 PM   #1
Cuzco_Brew
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Default Digital A/C for walkin cooler

I have a digital A/C that I am going to use for my walkin cooler. I am looking at making a DIY Coolbot to control the A/C. With a control like this I assume the fan in the A/C will run constantly. Can anyone confirm that is correct?

Having the fan on all the time seems a waste to me. Would it not be better to just have the fan come on when the compressor kicks in?

Is there a way to do this?
Or a reason not to?

Thanks
Zac

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Old 04-22-2012, 05:32 PM   #2
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The fan running continuously will help prevent stratification. Without the fan, the bottom will be much cooler than the top.

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Old 04-23-2012, 01:57 AM   #3
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Thanks. I will try it with the fan on low and see how we go.

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Old 04-23-2012, 02:00 AM   #4
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Subscribed (as long as there are pics of the process )

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Old 04-23-2012, 02:02 AM   #5
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I bought a cool bot and it is great for 60 degrees and below. I wish someone would create one for BCS or Brewtroller. I would automate my cool room then. I would also be interested in your DIY Build. My fan does work 100 % of the time, but I think that is a funtion of the AC, not the cool bot. My AC fan would cut on every 3 minutes or so I think if I put in Energy Saver Mode. I have never done that as we leave the fan running.

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Old 04-23-2012, 02:05 AM   #6
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What is a digital A/c?? Is that the same as a window ac unit? If so, why not just wire the ac unit up to a temp controller (johnson, or ebay aquarium temp controller DIY). It will only kick the unit on when it needs too. It works for my make shift wine cellar well.

But if I'm not understanding correctly......disregard....

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Old 04-23-2012, 02:52 PM   #7
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A digital A/C is the same as a window A/C unit, just with digital controls. My understanding is with these, you can't just plug it into a temp control, as when it powers up you need to press the on (cool or power) button on the front of the unit. So a control that just cycles the power to the until wont work.

You can rewire the unit to work with a temp controller, and I have seen a few threads on here on how to go about doing that. The idea of using a DIY Coolbot is that I wouldn't need to rewire it as such.

My DIY Coolbot is using a length of Flexwatt Heat tape to wrap around the temp sensor from the A/C, to trick it into thinking it's warmer than it is. The temp controller I have is reading the temp from the cool room and when it gets above temp it turns the heat tape on, which in turn triggers the compressor on the A/C. Unlike the Coolbot my DIY version does not have a second temp sensor to check if the coils are freezing over. So I will need to keep an eye on this.

I think I will just set the fan to low for now and see how that goes. I'll try and post some pics of the build shortly, there is one of it almost finished on my facebook page here.

Cheers
Zac

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Old 04-23-2012, 04:49 PM   #8
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I use a digital ac unit plugged into an eBay aquarium controller. It works fine. When it turns on it goes to the temp I previously set. However the energy eff setting won't stay set. The Non energy eff mode just turns the fan on for a couple minutes first to stir the air to determine if it needs to cool.

But I also only keep the room at 64 so I don't have to overrun the ac temp sensor.

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Old 04-23-2012, 09:59 PM   #9
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so.. how much do these ac units usually run you guys?

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Old 04-23-2012, 10:12 PM   #10
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Mine was about US$260, however I live in Peru. So I am sure you pay less for them in the US.

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