Author Topic: kenmore/frigidaire chest freezer set point  (Read 1000 times)

Offline jason1979g

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kenmore/frigidaire chest freezer set point
« on: July 25, 2013, 11:19:52 PM »
Hello, I have a Customer that uses these chest freezer as refrigerators to keep fertilizer alive. right now he just takes out the factory controls and installs after market t-stat to keep it at 35 degs. is there anyway to reprogram the factory controls to set it at 35 degs.? its not just one freezer. its a big operation, there's a hundred or so out there and there's going to be a few more hundred coming in.
model# 253.16582104

thanks in advance.

Jason

Offline tgoods

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Re: kenmore/frigidaire chest freezer set point
« Reply #1 on: July 27, 2013, 09:33:58 PM »
It's probably easiest to do what they're already doing.  You could experiment with thermistors that have a different rating. Maybe you could replace the controller with an $30 Arduino that you program yourself. The first one would the most time consuming, then save the program for the rest.  Can you post a picture of the schematic?

Offline RegUS_PatOff

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Re: kenmore/frigidaire chest freezer set point
« Reply #2 on: July 27, 2013, 10:22:52 PM »
depending on how handy you are ...
You could try adding a resistor in series with the original Thermistor.
A resistor of about 47k OHMs (or 56k) will offset the temperature that the Freezer "thinks" it's at.
You'd have to experiment to see what temperature the Freezer would need to be "set" at (about +5F),
to achieve the actual +35F
« Last Edit: July 27, 2013, 10:25:51 PM by RegUS_PatOff »
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Offline tgoods

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Re: kenmore/frigidaire chest freezer set point
« Reply #3 on: July 27, 2013, 10:46:54 PM »
I think I like Regus's answer better.  Take a resistance reading of the thermistor at freezer temperature and then another reading a 35 degrees.  The difference will be the ohm value of the resistor you would need. You could also use a potentiometer to adjust the resistance.  Once you get it dialed in, take a resistance reading of the pot and use the same value resistor on the rest of the freezers. Resistors are cheap, you would be saving your customer a lot of money.

Offline jason1979g

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Re: kenmore/frigidaire chest freezer set point
« Reply #4 on: July 29, 2013, 09:38:35 PM »
thanks for all the replays! i will defiantly try the resister and let you all know how it goes!

Offline jason1979g

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Re: kenmore/frigidaire chest freezer set point
« Reply #5 on: July 30, 2013, 11:00:43 AM »
could I possibly just put a resistor in place of the thermistor?

Offline tgoods

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Re: kenmore/frigidaire chest freezer set point
« Reply #6 on: July 30, 2013, 08:28:55 PM »
No, a thermistor changes resistance according to temperature. A resistor's resistance is static. The idea of adding a resistor in series is it changes what the control is sensing but retains the variable resistance of the thermistor in the circuit.

 

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