[tmaurer]

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?

[bluesman]

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

[tmaurer]

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?

[bluesman]

Yes. That would be a good strategy.

[dhacker]

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!