dead Friedrich AC unit, Model KM18J30B-3
Posted 09 August 2010 - 10:49 AM
It doesn't turn on (doesn't work in "cool" or "fan only" modes). I have measured voltage at the outlet I am plugging into to make sure that is not the problem and there is 110V there. I opened up the unit and tested the switch, it appears to be fine (switched "off, I measure no continuity where in any of the "on" position, I have continuity). There is a big metal dual AmRad Ultramet capacitor that looks to be for the compressor and fan, I could measure the capacitance on that but am not sure what #'s to look for. On the cap it says 30.0/7.5V, I'm guessing that the former is for the compressor and the latter for the fan. Manual and or schematics sure could help!
Posted 09 August 2010 - 10:51 AM
Posted 09 August 2010 - 11:17 AM
attached is the image of the cap...
Posted 09 August 2010 - 11:58 AM
Posted 09 August 2010 - 12:06 PM
even moreso, prior to testing it the other day i shorted it out to discharge it (unit powered off and unplugged, placed screwdriver blade between leads common and green for fan then common and black for compressor)
in any event, i'll try what you suggest and post reply.
Posted 09 August 2010 - 12:15 PM
Posted 09 August 2010 - 05:26 PM
Posted 09 August 2010 - 06:17 PM
you know i used to be handier with components, meters and electronics but my work has become more and more computerized so as time goes on i become rustier and rustier except when i work on my home appliances, infrequently as it is...
Posted 10 August 2010 - 12:32 AM
yes, capacitors are tested without power ...
got about 6-12 nF between the test point(s) and common; basically nothing.
12nF.. that is practically nothing ...
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Posted 12 August 2010 - 06:12 PM
prior to replacing the "suspect", for grins and giggles i measured it... lo and behold, it measured fine; when i measured it previously i had only removed the wires from the common terminal and left the wires on the fan and herm terminals so maybe that threw off the measurement? :?
so, at this stage of the game, i guess i need to look at the schematics and recheck the switch (maybe it's bad after all though it seems to test fine) as well as measure voltage at various points to see where it's dropping off.
what's throwing me off is that neither the fan nor the AC work, that's why I was suspcious that there was a commonality that was/is the culprit but i just don't know which way to go...
Posted 03 September 2010 - 07:34 PM
thanks for the reply by the way. was away for a while and now we're back it's hotter than heck here in NYC. what 2 wires am i to tye together, i have an alligator clip to alligator clip cable ready to go...?
by the way i have a schematic but it's for a KM18L30-C,-D which is not the same as the unit i have...
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