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Old 07-15-2009, 10:07 PM   #31
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Lennox G20 Series - Bad blower board - or is it more?


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I am hoping the reason it blew was the water leak down the thermostat wire etc.

I'm hoping that all water residue is gone.

However, the fact that the system worked for 1 week and then DIED AFTER I solved the water problem is still mystery. A weakened 'former decidedd to kick the bucket on it's own time??

The system has always RAN fine once on, it just WON'T start a new cycle when prompted by the thermostat (historiclly speaking here - read the full thread for detail).

FYI: My old thermostat was a 4 wire and the new thermostat accommodates the system fine - with 4 wires.

All wire connections to AC and internals look fine (what's visualized easily). The thermostat wire is new.

Actually, I need to get the electronic air cleaner working. I imagine that would be good for the seasonal allergens in the air??? I'll bet it's the power supply in that puppy that died.... perhaps another thread??

I'll get to the Transformer fuse tomorrow and let you know what I find!

Thanks for all the help, and for speaking in Lay-persons terms.

Hmmmm, I wonder if there is a circuit that spikes when the thermostat tells the system to turn off????????????? Wish I had the fuse on there now!

Thanks again,

Richard
If the system continues to work for X weeks you will decide it is fixed. Based on the recent past, what value would you use for X?

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Old 07-15-2009, 10:11 PM   #32
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Lennox G20 Series - Bad blower board - or is it more?


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If the system continues to work for X weeks you will decide it is fixed. Based on the recent past, what value would you use for X?
Pi r 2?
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Old 07-15-2009, 10:14 PM   #33
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Lennox G20 Series - Bad blower board - or is it more?


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Pi r 2?
Old joke: What is the square root of 69?
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Old 07-15-2009, 10:17 PM   #34
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Lennox G20 Series - Bad blower board - or is it more?


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Old joke: What is the square root of 69?
Lickety-split?
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Old 07-15-2009, 10:19 PM   #35
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Lennox G20 Series - Bad blower board - or is it more?


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Lickety-split?
Eight something.
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Old 07-15-2009, 10:58 PM   #36
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Lennox G20 Series - Bad blower board - or is it more?


While I question the accuracy of your tag-line (and perhaps electron preference):

I would like to know what the most common reasons for a burned transformer are??

Thanks All,

Richard

Ps. Dracula, have you ever heard of V:tES (VTES, Jyhad - 1994 name)?
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Old 07-15-2009, 11:37 PM   #37
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Lennox G20 Series - Bad blower board - or is it more?


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While I question the accuracy of your tag-line (and perhaps electron preference):

I would like to know what the most common reasons for a burned transformer are??

Thanks All,

Richard

Ps. Dracula, have you ever heard of V:tES (VTES, Jyhad - 1994 name)?

OOOhhh boy...too numerous too mention but it just might be the magnetic coil on your ac contactor or a spot rubbed bare on the stat cable to your ac.
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Old 07-16-2009, 01:28 AM   #38
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Lennox G20 Series - Bad blower board - or is it more?


I'm getting these posts out of sequence ....

As for the X factor: Bummer. I hear you saying the pup is on it's way out?The definition of X I want and what those with experience anicipate from a 1989 unit are possibly two different things ... is my worry. So, you tell me. What should I expect?

Better yet,

What else do I need to do to make this puppy last a couple more seasons???

Old joke: What do you call a Roman with a hiar between his teeth?
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Old 07-16-2009, 10:41 AM   #39
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Lennox G20 Series - Bad blower board - or is it more?


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As for the X factor
What else do I need to do to make this puppy last a couple more seasons???
Things with coils are inherently hardy, but. . .

Heat ruins a 'former and heat comes from current flow and if it's abnormally high [like from an overload or short circuit] or the ambient temp. is very high, the 'former life will be very short.

With fusing you are taking a reasonable precaution to protect your new 'former. You could use an inline fuse or find a place to mount a fuse holder.

With the value of X:
if your 'former failed every week, and then lasted 4 consecutive weeks without failing I'd say the root cause is fixed, so X = 4.
If your 'former failed once/yr, and then lasted 2 or 3 consecutive yrs without failing I'd say it's fixed, so then X = 2 or 3.

BTW, if it's the custom in HVAC circuitry to fuse the secondary, then I'd follow the custom.

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Old 07-16-2009, 11:32 AM   #40
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Lennox G20 Series - Bad blower board - or is it more?


I'll get the fuse set up today.

Regarding heat, the region the 'former is in is a bit tight. Not sure how to deal with that without working with sheet metal.

BTW: That is one incredible Photo (profile image). I think I'd get out of the water! Wow.

The unit does seem to be responding normally. I'll likely chime in a couple more times; certainly until the fuse is set.

Thanks,

Richard
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Old 07-16-2009, 11:41 AM   #41
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Lennox G20 Series - Bad blower board - or is it more?


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Regarding heat, the region the 'former is in is a bit tight. Not sure how to deal with that without working with sheet metal.
With the price of some control boards, if you had failures traced back to excessive heat it might be worthwhile to mount a small $5 computer fan to blow air over the board.
Hosfelt.com has these.

So what do you call that Roman?
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Old 07-16-2009, 11:42 AM   #42
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Lennox G20 Series - Bad blower board - or is it more?


Joke: Gladiator
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Old 07-16-2009, 12:06 PM   #43
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Lennox G20 Series - Bad blower board - or is it more?


I have thought about putting a fan over the board as you suggest. I happen to have an extra case fan and an extra video card lying around somewhere.

Should I draw power from the 120V side or the 24V side? I suppose I could crack a computer case and find out quick enough.

Richard
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Old 07-16-2009, 01:37 PM   #44
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Lennox G20 Series - Bad blower board - or is it more?


If you add a fan to a gas furnace you may have to put in baffles to avoid disturbing the flame.
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Old 07-16-2009, 08:03 PM   #45
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Lennox G20 Series - Bad blower board - or is it more?


I've elected to NOT go with the fan. I'll be adding the fuse tonight. Decided to ge with the 3 amp inline.

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