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Old 03-27-2009, 02:55 PM   #46
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Ruud Service Manual, Pros don't want me to understand my system


Good for you. Hey your stealing work from the carpenters

Just don't have a Bong party and over load that puppy.

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Old 03-27-2009, 11:24 PM   #47
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Ruud Service Manual, Pros don't want me to understand my system


I've seen some of the Bob villa shows, seems like HVAC usually lasts about 2 minutes. Not long enough for me to learn some good hacking :-)

Speaking of HGTV, we watched one of those "flip" this house shows.

Must have been a year or more ago (bought over priced dump, reworked a bit by transient labor, resold slightly fixed up dump for twice the cash). People were totally consumed by the belief that prices were going up up and up.

Wife and I wish they had a "where are they today" piece - waiting for Obama to save them?
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Old 03-28-2009, 08:34 AM   #48
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Ruud Service Manual, Pros don't want me to understand my system


" (bought over priced dump, reworked a bit by transient labor, resold slightly fixed up dump for twice the cash)." And the sad part was that the sleazy mortgage brokers were getting people in the slums to sign up for these homes so they could get out of the slums. Both knew they could not really pay for them. Seems to be a worldwide problem, people living off credit. I pay cash or pay the card off every month.

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Old 03-28-2009, 06:55 PM   #49
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Ruud Service Manual, Pros don't want me to understand my system


Only use 'em when I have to get parts at wholesaler I have no account with.

Oh! And a cash advance every now and then when I 'm blotto at the casino
and feel lucky.
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Old 03-28-2009, 07:01 PM   #50
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Ruud Service Manual, Pros don't want me to understand my system


Well, the weekend project took a turn for the worse (Ruud 80% Gas Fur (UGLG-05EAUER)

I was hoping to limit my problem to a ignitor or PS, and then move on to replacing the cracked inducer.

Flame roll out switches all showed 24 volts to ground, pressure switch was ok (closed, opened to 24 volts, then closed - just like the other furnace that was working ok)

Checked ignitor again, it had a complete circuit (ignitor is new - installed last week). Plug to ignitor never showed any voltage. Unplugged power cable from ignitor to circuit board (including the connection of the inducer)- checked for resistance - no problem.

System was doing everything right (timing, clicking of PS, clicking of relays), just no power to the ignitor. Green light on "power", green light on "OK".

Looking at the trouble shooting diagram on the furnace, it suggested a new circuit board (based on getting past the other components). Then I decided to wiggle the inducter/ignitor connector to the circuit board when the system was trying to start, I had the probes on the ignitor plug. Something was loose, was it the plug, was it the connections to the board, or was it a relay??? - anyway, the inducer turned off and on, and the power to the ignitor finally showed up at 110 V. I had to wiggle it just right to keep the inducer running (this wasn't a problem before), but I could never keep the voltage to the ignitor consistent - it came and went and sometimes would come back at only about 60-70 volts - I could make the voltage bounce during each attempt before lockout. I shut the system down. Made sure the plug was in the circuit board firmly - restarted the system, again everything was ok, but no voltage to the ignitor.

So its either the circuit board or the connector.

As for the connector (4 wire cable for the inducer and ignitor), on one end is a 4 pin connector on the other is a 6 pin connector, I'm not ever sure I can get one - maybe need to make one from scratch ??

Circuit board looks outdated from what I can tell, I believe the new circuit boards have three lights (one amber) and there is a need to add a upgrade flame sensor probe. Dang.
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Old 03-29-2009, 10:59 AM   #51
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Ruud Service Manual, Pros don't want me to understand my system


10 yrs is the average life of them. Solder connections fail on the back of them and they just plain die from old age. Check the pins on that connector with a magnifying glass. On the MOLEX type occasionally they get pushed back and don't seat properly. Push them forward into the connector if necessary.
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Old 03-29-2009, 04:17 PM   #52
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10 yrs is the average life of them. Solder connections fail on the back of them and they just plain die from old age. Check the pins on that connector with a magnifying glass. On the MOLEX type occasionally they get pushed back and don't seat properly. Push them forward into the connector if necessary.

Yeah, seems like those kind of connectors are short lived in my computers as well. I can't even remember the number of 5V connectors I've tossed. Rheem/Ruud didn't do a good job on the length, the wires are tight (in tension), so I'm sure the helped degrade it.

Went looking for a new harness today on the internet, I even was able to find the Rheem part number from a Rheem parts list PDF (6 pin to 4 pin - looks like Rheem used it for 20 years). No one seems to list it. I guess the next step is emails to places. I did find the molex plug from a electronics store, but I'd have to build the whole thing myself - so plan A is now either a new harness or try to fix the one I have. I wish they included them with the circuit boards.

Another puzzling thing I found, my working Ruud furnace has a flame sensor wired into the ignitor wiring (maybe was a retrofit). My non-working Ruud doesn't have a flame sensor. Both furances are identical and were installed at the same time......and both are outdated relative to the replacement circuit board that requires the flame sensor to be connected directly to the board.

I'm not sure why one was retrofitted and not the other, unless the heat in the attic in the summer convinced someone to not work on it.
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Old 03-29-2009, 04:48 PM   #53
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Rheem and a few Colemans used the HSI igniter as the flame sensor and the whole idea was a piece of sh*t. They abandoned it and went back to the standalone flame sensor. One of yours was manufactured right at that transition time and not the other.
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Old 03-29-2009, 04:56 PM   #54
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Rheem and a few Colemans used the HSI igniter as the flame sensor

I remember those... AT 1 time rheem had that standing pilot... Had that small hood over the pilot with a tube that went to vent motor
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Old 03-29-2009, 05:01 PM   #55
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Ok, that explains it, I was really scratching my head on how they were different, and I was trying to figure out how the one furnance was able to sense the flame.

The retrofit looks like a hack instead of just replacing the board - the splice into the ignitor wire reminds me of the 70s when people were wiring their 8-track tape players into their 60s cars.
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Old 03-29-2009, 06:27 PM   #56
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I had a 8 track and a pretty hot AMC Gremlin (first car). Bee Gees were popular at the time. Had lots of hair then too.
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Old 03-29-2009, 06:45 PM   #57
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I had a 8 track and a pretty hot AMC Gremlin (first car). Bee Gees were popular at the time. Had lots of hair then too.
LOL, I had back in those days too.

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