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Old Amana frid mod BB120TE Evap fan


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5 replies to this topic

#1 Sonic

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Posted 05 December 2012 - 04:56 PM

This old frig works except for the evap. fan. I measured what I thought was 120v and the motor but no spinny spinny. Found a replacement motor but the same thing.  So checking further I find I do have 120v there but no neutral.  I pull this beast away from the wall and find the wiring diagram.  Turns out the neutral is switched at the defrost board. At least that's what it looks like to me. It seemed strange to me to have a fan controlled on the line and neutral side.  I'm left assuming it's the defrost control causing the problem.  Any thoughts.....?



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#2 KurtiusInterupptus

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Posted 05 December 2012 - 05:15 PM

havent seen the diagram, but the power for the evap fan goes thru the bimetal defrost tstat on alot of these amanas...easy enuff to bypass for testing...


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#3 Sonic

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Posted 05 December 2012 - 05:22 PM

Yes I saw that it could go through the termination stat and heater on the neutral side but it also connects to the defrost board.  A service manual for this one would help.



#4 RegUS_PatOff

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Posted 05 December 2012 - 05:59 PM

Yes I saw that it could go through the termination stat and heater on the neutral side but it also connects to the defrost board.

connects to the Defrost Board, but not controlled by it ...

Neutral for the Evaporator Fan goes thru the Defrost Heater and the Defrost T'stat

 T120_0R0.pdf

 

http://www.repaircli...?R=154&N=379484

 


http://www.repaircli...?R=154&N=387642


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#5 Sonic

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Posted 05 December 2012 - 08:07 PM

Thanks RegUS_PatOff, that's exactly the info I needed.  



#6 certified tech group 51

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Posted 05 December 2012 - 10:20 PM

Also, after replacing the failed part, when plugged, in the fan will not start right away.........It needs the defrost terminator to  close before the neutral side is completed..........................Been caught on this one once, you plug it in and the fan still does not start.. :woot: ........






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