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Old 04-27-2010, 09:58 PM   #1
Apr 2010
Boulder, CO
Posts: 4

I have a fridge wired to an auber Instruments PID temp controller and I have a couple of questions. First What is a healthy cycling time for the fridge's compressor? Right now it goes off for about 5-10min then on for 30sec - 1min.
Is that too short an on time.

Second I currently have the 't' variable set to 120 but the cycle stays on for much shorter then 120 sec I don't know whats going on there.

Any advice?

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Old 04-27-2010, 10:01 PM   #2
Jan 2009
Boise, ID
Posts: 728
Liked 12 Times on 10 Posts

I was wondering the same thing. I set my 't' variable to 30 thinking it would give a minimum running duration of 30 seconds for my gas valve, but it seems like that just controls how often it is allowed to cycle, but doesn't affect minimum run time.
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Old 04-28-2010, 04:36 AM   #3
Jun 2007
Posts: 168
Liked 1 Times on 1 Posts

You could email them directly from their website - I have found them quite responsive in the past.

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Old 04-28-2010, 05:47 AM   #4
Aug 2008
Portland OR
Posts: 5,387
Liked 63 Times on 59 Posts

I thought PID's were a no-no for fridges. I use a digital controller for my keezer with 12 minute anti short cycle delay, on time is guided by the need for cooling.

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Old 04-28-2010, 12:18 PM   #5
cwilliams108's Avatar
Apr 2009
Indianapolis, In
Posts: 71

The Auber temp controller has a "relay mode" (can't remember specifically what it's called) that allows you to use it as such.
From auber's site:
"This controller has been upgraded with many new features. The cold junction compensation circuit has been improved for better accuracy when used with thermocouple sensor. A true on/off control mode is added. It is useful for controlling a refrigerator, motor, or solenoid valve that does not like to be switched too frequently"
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