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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
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Contents:
  Problem controling fermetation temp (alejandro ramirez)


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Date: Tue, 5 Aug 2014 21:14:02 -0700
From: alejandro ramirez <guaild at yahoo.com>
Subject: Problem controling fermetation temp

Hi all! I've recently started fermenting using a 100 gal conical, jacketed
fermenter. I'm attempting to control the temperature using an A419
Johnson temp control, set to start glycol flow through the jacket at, say,
68 deg Fahrenheit. The temperature at which the relay is turned off is
defined by the temp differential, say 3 degs. So, in theory, when the
thermostat reads 68 or higher, the glycol starts to flow, until the temp
falls to 65 degrees.

The glycol is stored in an insulated tank ranging from about 23 to 28
degrees.
The problem is, apparently there is a lag time between the moment
that the correct amount of heat has been drawn out from the wort in
the tank, and the moment that the sensor actually reads the target
temperature and stops the glycol from flowing. So what happens is
that the temperature keeps dropping quite some time after the glycol 

has stopped flowing, bringing the temperature way below the lower
limit (say, 57 or 57 degrees). This can have quite adverse effects on
the yeast, as you all know.
Since the fermenting wort is not supposed to be moved around in the
tank (which would homogenize the temp and provide a quicker, correct
read), I figure I might use a timer to limit the flow of coolant for a set 

length of time, assuming that the correct amount of heat will be
subtracted from the wort.
An opinion, anyone? Do you think this is the best way to go?

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