defrost adaptive control refrigerator

[viking351]

i'm from the OLD school like JW.
in the old days we used defrost timers. they were easy to check and repair.

my question is with a defrost adaptive control how do you test it? do you just "parts change" and see if it works?

i would check the timer, the heating element and the defrost thermo replace as needed(under the old system) if the timer was defective i would replace along with the termo.

the electronic age is crazy!

[schaffersapplian]

ADC's continually adjust defrost intervals based on number of door openings, compressor runtime, and if it has a board, the board will monitor how long the defrost terminator keeps the heater energized.   All the boards are different from machine to machine, and work differently measuring different methods described above.  All the different ADC boards have ways to start defrost.  But to remember all of them is a different story.  When i get a machine with a ADC board, i usually pull the evap cover and check for a closed circuit. If the circuit is open i will check individual components to see whats bad. IE: heater or bi-metal. if they check good i will change the ADC board.  thats my method, and don't get many call backs.  If you send me a PM with your address, i will send you a copy of a ADC manual i have from the MSA convention. Lots of good info on starting defrost cycles on many machines and the way that they each work.

[schaffersapplian]

i would scan it into a pdf file, but i dont know how to :-)

[JWWebster]

Let me splain it to yall

[JWWebster]

In these new fangled ice boxs is what you call adaptive defrost controls. Instead of the old tried and true defrost timer, brainiacs have decided to use artificial intelligence to determine defrost. The basic pattern of adaptive defrost is: COOLING,PRE-CHILL,DEFROST,DWELL,and POST-DWELL. Hey I ain't making this up. The ADC (adaptive defrost control) Counts the number of times the doors are opened, the total compressor run time, and the length of time the defrost heaters were on during the last defrost. This method supposedly enables the adc to work nice in all kinds of conditions, whether hot and humid or cold and frigid climates. COOLING Mode will remain for an indefinate time or until defrost is determined by the micro-processor. When all systems are go for defrost the adc makes the jump to light speed by going into PRE-CHILL, this brings down the temps in the freezer to off set the defrost operation so that the food temp does not suffer dramatic temp rises. Pretty cool ain't it? If the ice box is in pre chill and the door gets opened then a DEFROST HOLD OFF will jump in and not do a defrost for several hours. If the door is continually opened at the end of 16 hours the adc is gonna defrost that ice box anyway. The defrost varries but is a maximum time of 45 minutes including DWELL. Dwell is the length of time the ice box stays off AFTER the heater is terminated.
Then The POST DWELL will kick in. The post dwell will fire up the compressor and condenser fan but the inside fans will not run allowing the coils inside to cool down before them fans kick in and she jumps back into Cooling mode. I bet you would like to have a copy of GE's adc repair manual wouldn't you?

[viking351]

thank you so much jw. your the best.

viking

[JWWebster]

http://repair2000.com/Library/ge_adaptive_defrost.pdf

[magician59]

 
I bow to you: You can get any info out there!

[JWWebster]

I have had lots of help from some very good friends.