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Old 09-17-2012, 01:00 AM   #11
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I missed that.

Ok: Right there this presents a serious problem. Now I understand why it is freeing up. The next issue is where is the temp probe placed? And then: Is there a return path for the cooling air being blown into the tower?
Using a Johnson controller presents a problem? I have moved the temp probe around with no effect. It just can't keep up. It's gotta be the return path for the tower cooling air. It's a really short run, probably 2.5 feet to the tower. Do you think that fan is even necessary?
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Old 09-17-2012, 01:01 AM   #12
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Oh also, make sure the factory thermostat is turned up to max so the Johnson has full control.
Yeah, checked that.
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Old 09-17-2012, 02:51 AM   #13
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It's gotta be the return path for the tower cooling air. It's a really short run, probably 2.5 feet to the tower. Do you think that fan is even necessary?
The fan setup is just to keep the foam down on the first pour due to the tower lines, shanks and taps being room temp. I don't use a fan in my Sanyo and I rarely have trouble with the first pour. I rub the taps down with ice for a minute before the first pour if the beer on tap happens to start giving foamy pours.

If you want to eliminate all the variables for an all out test you can unplug the blower, turn the factory thermostat up to max, and plug the Sanyo directly into the outlet, bypassing the Johnson. Leave the Johnson plugged in however so you can still use it to monitor the temp without opening the door. Taping the Johnson probe directly to the keg will help you monitor the actual beer temp which will take longer to cool than the gel I'd imagine. Check on it every couple hours, if the fridge is working properly it can freeze your beer.
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Old 09-17-2012, 03:15 AM   #14
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The fan itself might be the problem. I used to use one in my first kegerator but stopped using it when I realized that the fan heated up the air by several degrees. It did keep the tower cooler, but at the expense of the beer itself. I've upgraded to a larger diameter tower and removed the fan and have not had any issues since. the tower stays cold, the beer gets as cold as I'd like and the compressor cycles on and off.

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Old 09-17-2012, 10:40 AM   #15
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Thanks, guys! I am going to have him remove the fan and the controller and make sure the fridge is fine and then test the other two variables.

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Old 09-17-2012, 11:21 AM   #16
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Using a Johnson controller presents a problem? I have moved the temp probe around with no effect. It just can't keep up. It's gotta be the return path for the tower cooling air. It's a really short run, probably 2.5 feet to the tower. Do you think that fan is even necessary?
And:
Quote:
The compressor runs constantly. The back freezes up, so I think the coolant is ok.
...
Right now the corny keg is sitting at 53 degrees. There is a Johnson controller set to 39 degrees. The temp probe is in a small bottle of freezer goo.
I suggest that you get rid of the controller and set the temperature to your target temp using the refrigerator temp control. The refer is being over driven now and is not doing much chilling because it is being over driven and icing the cold plate.

The suggestion by some to set the refer thermostat to max is a huge mistake. And, also like I said, using an external controller is a mistake as well.

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Old 09-17-2012, 12:41 PM   #17
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And:

I suggest that you get rid of the controller and set the temperature to your target temp using the refrigerator temp control. The refer is being over driven now and is not doing much chilling because it is being over driven and icing the cold plate.

The suggestion by some to set the refer thermostat to max is a huge mistake. And, also like I said, using an external controller is a mistake as well.

P-J
I don't understand how it could be "over-driven" all the Johnson controller does is provide power to the fridge and cut it off when it reaches target temp, right?
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Old 09-17-2012, 01:21 PM   #18
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I don't understand how it could be "over-driven" all the Johnson controller does is provide power to the fridge and cut it off when it reaches target temp, right?
If you say so. But then I guess you are not having any problems with the refrigerator. The Sanyo 4912 is a self defrosting unit. It is not a freezer and does not have a freezer compartment. If you bypass the built in controls, then what? You already stated that the cooling plate becomes covered with ice.

Good luck. I'm done.
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Old 09-17-2012, 02:11 PM   #19
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If you say so. But then I guess you are not having any problems with the refrigerator. The Sanyo 4912 is a self defrosting unit. It is not a freezer and does not have a freezer compartment. If you bypass the built in controls, then what? You already stated that the cooling plate becomes covered with ice.

Good luck. I'm done.
I'm not arguing. I appreciate your help. I'm just trying to understand how it works. I just bought a 4912 myself and would like to avoid the issues. As far as I could tell I am not bypassing and defrost timers or anything, since the Johnson Controller just cuts power at a certain temp. I could see overdriving it if I was telling the Johnson controller to get the fridge to 15 degrees and then set the fridge thermostat to "Max". But this is sitting at 53. The fridge is constantly powered, which means any defrost timers would still be able to function. I checked the parts diagram for the 4912 and couldn't find any defrost timers or heaters. Is it actually self-defrosting?
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Old 09-17-2012, 03:16 PM   #20
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I have the same fridge converted into a kegerator. If it does not reach proper beer temps without the external control then something is wrong with it.

image-3917988801.jpg

I have the temp setting at 5 and it is currently 38 degrees. If I crank it to the max setting it will go down to 30 degrees without freezing the compressor. Much too cold for good beer, but it does not need the external control.

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