Author Topic: Johnson digital temp controller  (Read 720 times)

Offline tmaurer

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Johnson digital temp controller
« on: August 19, 2010, 08:08:59 AM »
My temp controller has an "OF5" setting.  What the heck is that for?  That little tidbit isn't included in the instruction sheet.  Any ideas?

Offline bluesman

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Re: Johnson digital temp controller
« Reply #1 on: August 19, 2010, 08:20:33 AM »
What model controller do you have?

I have the A419 and it has an OFS setting which is a temp offset setting.

Temperature Offset (OFS) establishes the value of setpoint-shift (in F° or C°) applied to Setpoint (and Differential) when a (user-installed) circuit is closed between the binary input (BIN) and common (COM) terminals. The offset value may be set from 0 to 50F° or C°.

http://cgproducts.johnsoncontrols.com/MET_PDF/125188.PDF
« Last Edit: August 19, 2010, 08:25:06 AM by bluesman »
Ron Price

Offline tmaurer

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Re: Johnson digital temp controller
« Reply #2 on: August 19, 2010, 08:57:30 AM »
Mine isn't the dual function (heating and cooling) model.  So if I understand correctly, I should just leave that at 0 and forget about it?

Offline bluesman

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Re: Johnson digital temp controller
« Reply #3 on: August 19, 2010, 09:23:40 AM »
Yes. That would be a good strategy.
Ron Price

Offline dhacker

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Re: Johnson digital temp controller
« Reply #4 on: August 19, 2010, 09:24:25 AM »
I will assume yours is the A419, and it would be a dual function, but it has to be setup for heating on the inside (unless you install a toggle switch to the outside). I use a 2 degree offset . . It helps somewhat with the compressor trying to hold the temp perfect which leads to increased on/ off cycling.

Correction . . I use 0 degrees OFS on the ferment chamber and 2 degree Dif  . . thought I'd better check to be sure!  :-[
« Last Edit: August 19, 2010, 09:45:22 AM by dhacker »
Just brew it...