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Re: Slightly OT: Wine fridge temperature hysteresis?

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On 2017-03-05 16:15, Lasse Langwadt Christensen wrote:
> Den mandag den 6. marts 2017 kl. 00.43.37 UTC+1 skrev Joerg:
>> On 2017-03-05 14:52, Lasse Langwadt Christensen wrote:
>>> Den søndag den 5. marts 2017 kl. 20.31.48 UTC+1 skrev Joerg:
>>>> What is normal for a temperature hysteresis (or "dead band") in a wine
>>>> fridge? I am seeing 5F and more. It is a Vinotemp VT182.
>>>>
>>>> Long story short I modified it to become a beer fermenting chamber and
>>>> added heating capability. Due to it being winter out here it is operated
>>>> in heat mode right now and the original controller is still used to
>>>> measure and regulate temps. I didn't hack the micro controller part of
>>>> it (yet ...).  Currently it is set to 65F. Heat came on at 63F or 64F
>>>> and now it's topped out at 69F, still heating. Since the heater is wimpy
>>>> that means it may be always on until it gets warmer outside. No problem,
>>>> just got me to wonder why the hysteresis is so large on these.
>>>>
>>>> In case someone wants to know what's currently in there: American Wheat,
>>>> Honey Porter, IPA and Pale Ale. It sure beats having all these buckets
>>>> standing around in the downstairs room and having to run the pellet
>>>> stove just for the fermenters.
>>>>
>>>
>>> maybe it is just that you don't want the compressor (or heating relay) to
>>> cycle on and off all the time
>>>
>>
>> That can be maintained otherwise and actually is. They programmed a
>> delay into it so if someone changes the temperatures back and forth very
>> fast on the control panel it waits a long time to turn on the
>> compressor. This avoids short-cycling.
>>
>
> sure but there is a limit to how tight you can make it if you also want a
> say +10 minute wait period between starts to limit wear on the compressor
>

The simple on-off controller on the old fridge ran on a 2F hysteresis 
just fine. Even less than 1F worked but I kept it set at 2F. Insulation 
and thus time lag on both fridges is similar.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 11:31 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Adrian Jansen <adrian@qq.vv.net> - 2017-03-06 07:46 +1000
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 14:43 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Adrian Jansen <adrian@qq.vv.net> - 2017-03-06 11:23 +1000
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:48 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? dplatt@coop.radagast.org (Dave Platt) - 2017-03-06 11:41 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 12:04 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 14:52 -0800
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-05 15:43 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 16:15 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:49 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? "dcaster@krl.org" <dcaster@krl.org> - 2017-03-05 17:10 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? amdx <nojunk@knology.net> - 2017-03-06 06:14 -0600
          Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-06 07:18 -0800
          Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 07:53 -0800
    Re: Slightly OT: Wine fridge temperature hysteresis? jurb6006@gmail.com - 2017-03-05 16:26 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-05 16:42 -0800
        Re: Slightly OT: Wine fridge temperature hysteresis? jurb6006@gmail.com - 2017-03-05 20:41 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-05 17:53 -0700
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 08:02 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 10:19 -0800
  Re: Slightly OT: Wine fridge temperature hysteresis? Mike Perkins <spam@spam.com> - 2017-03-06 02:12 +0000
    Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-06 08:06 -0800
      Re: Slightly OT: Wine fridge temperature hysteresis? Mike Perkins <spam@spam.com> - 2017-03-07 00:56 +0000
        Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-07 07:32 -0800
          Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-07 10:57 -0800
            Re: Slightly OT: Wine fridge temperature hysteresis? makolber@yahoo.com - 2017-03-07 10:59 -0800
              Re: Slightly OT: Wine fridge temperature hysteresis? Joerg <news@analogconsultants.com> - 2017-03-07 11:19 -0800

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