hey all you experts out there!!
so a friend bought a house and it has this enerex air exchange controller unit. it appears that this unit drives 2 fans. It didnt work.
when i took it apart, i noticed a very burnt 4.3k 5w resistor that had literally melted its solder joints and was literally loose on the board. I tried replacing it with the same specs and that appeared to "fix" the circuit in the sense that the 2 ouput lines (a set of 2 red and 2 black lines that appear to power the 2 fans) i was getting 17vac on one side and like 20 vac on the other. However , the resistor was getting extremely, extremely hot.
so, i swapped it out for a 7watt and it seems to be not so hot, but i only had a 10k, so i know its not the right one, funnly thing is, i was getting the same output readings.
the circuit has 3 400v 8a traics, a zero voltage switch, and then a 555 timers and what appears to be an optoisolator for the dc side.
basically its not outputting enough current or voltage i am assuming. when i reconnect the unit, both fans appear to be trying to start but its as if they dont have enough juice, both fans are big 115vac rated fans, so surely this circuit is not working as it should be.
there is zero information like schematics, or anything for that matter on the net.
does anyone out there know what this circuit is, and how it should be preforming? am I supposed to be getting 120VAC on both of those red and black outputs? any idea how to test this thing, or rewire it or any advice at all?
i have replace all 3 triacs, i have replace the 3059ca zero voltage switch, and i have tried several different resistors in place of the really hot 5w ceramic.
any advice appreciated.
thanks
chris
p.s the pics just show the controller, and the bottom of the circuit board. hopefully you get the idea, i can post better pics if needed.