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Old 06-24-2010, 08:08 PM   #1
billc68
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Default Reccomend a thermostat, please

K, I have one chest freezer as my keggerator using a Johnson Controls Thermostat. Not sure the model, but it is the one that has a 4 degree variance.
I do have another chest freezer that I want to use for fermentation until I can get an upright freezer. Some say that a 4 degree variance is not good enough for fermenting (although I am sure the temp inside the fermentor likely only varies by a degree or two)

What is a good thermostat for a fermentation chamber, I will be doing ales and lagers in it.

Am I right in assuming the temp of the wort will not vary as much as the air in the chamber?
A, there will be residual heat from fermentation,
B, liquid holds heat longer than air,

My belief is that is my compressor kicks in at let's say 60 degrees and brings it down to 56, my wort should always be in the 57-59 degree range???

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Old 06-24-2010, 08:12 PM   #2
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Quote:
Am I right in assuming the temp of the wort will not vary as much as the air in the chamber?
A, there will be residual heat from fermentation,
B, liquid holds heat longer than air,
Yeah, I think you are thinking correctly. The air might sway 4 degrees but the liquid won't.
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Old 06-24-2010, 09:11 PM   #3
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Tape the sensor to the outside of the fermenter and it will moderate the the temp swing a bit.

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Old 06-25-2010, 01:21 AM   #4
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Originally Posted by BargainFittings View Post
Tape the sensor to the outside of the fermenter and it will moderate the the temp swing a bit.
I may brew two or three at a time though... Maybe I could stick it between fermentors.
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Old 06-25-2010, 02:07 AM   #5
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Anyone using this one?
http://www.homebrew-supplies.ca/viartshop/product_details.php?category_id=0&search_string=te mperature+control&search_category_id=0&item_id=589

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Old 06-25-2010, 02:25 AM   #6
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I've got one of the Johnson A419 Digitals on my keezer. You can adjust the variance down to 1 degree. Very accurate controller. $67 to the door.

http://www.energysavingcontrols.com/Search.aspx?k=A419ABC-1C+

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Old 06-25-2010, 02:34 AM   #7
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Quote:
Originally Posted by BendBrewer View Post
Yeah, I think you are thinking correctly. The air might sway 4 degrees but the liquid won't.
+1 The temp variance of the beer will be negligible. A 3 or 4 degree swing in the air temp won't cause any problems whatsoever.
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Old 06-25-2010, 09:06 AM   #8
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Quote:
Originally Posted by JakeTheHopDog View Post
I've got one of the Johnson A419 Digitals on my keezer. You can adjust the variance down to 1 degree. Very accurate controller. $67 to the door.

http://www.energysavingcontrols.com/Search.aspx?k=A419ABC-1C+
How was it to install? do you need to hard wire it? or just plug in your freezer?

I'll check that one out, living in Canada sometimes makes ordering these a PITA. If they ship by USPS, no big deal, if they use a courier, I get nailed with duties and brokerage fees, not to mention the exchange (which these days is pretty good) I have purchased $35 items that were $75 to my door.
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Old 06-25-2010, 09:16 AM   #9
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I have the Ranco and am happy with it. I don't think you can go wrong with Ranco, Love, or Johnson. I'd go digital though, just because it makes it alot easier to adjust the temperature often for fermentation, diacetyl rest, crash cooling, etc..

I got this specific one from Climate Doctors. Their prices are better than most places (they're also an amazon retailer)
http://www.climatedoctors.com/Items/ranc1?&caSKU=ranc1&caTitle=RANCO%20ETC-111000%20Microprocessor%20Temperature%20Control

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Old 06-25-2010, 09:30 AM   #10
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Quote:
Originally Posted by billc68 View Post
Am I right in assuming the temp of the wort will not vary as much as the air in the chamber?
I'd say "no" or "it depends." If the outside air is warming the interior of the fridge, the air inside the fridge may warm faster than the beer. If the beer is warming the air inside the fridge, the beer will necessarily be warmer than the setpoint.

A 4ºF hysteresis is fine for a kegerator, not good enough for controlling fermentation.
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