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Old 04-09-2009, 08:20 PM   #1
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Hey Pros: Did my YJ gauge manometer fail me?


Did my YJ gauge manometer fail me?
I had a Tech IV furnace over gas and shoot flames into the furnace vestibule after i installed a new igniter. i installed the furnace back in 96 and the HO insisted nothing had been done since, yeah right.

The Smart Valve manifold press was 5"wc by my analog manometer.
I recalibrated it to 3.5" and refired it. 3 ot of 5 retries flames shot out of the burners. Each time it overfired the manometer was steady on 3.5" and the sound of gas going into the burners was much louder than normal.

The same thing happened at 3". The needle did not deflect up durning any of the back fires.

I finally got the burners to operate normally at 1.75". Before I forget supply press was 7"wc constant.

I installed a new 90% furnace and hauled the old one away.


Today I did an autopsy onthe old Consolidated furnace.

Here's the result:

Inducer:-90" wc---normal operation.

Heat ex: No cracks or separation at collector box.

No blockages in heat exchanger.

Cross lighters: Clean

Burner Orifices: Clean

Position of igniter: Installed with pilot positioned correctly for pilot light off of main burners.

That leaves the smart valve regulator. But what i don't get is why there was no increase in gas press when the flames shot out of the furnace.

I doubled checked my manometer against another one tha I know is accurate and it agreed.

What gives?

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Old 04-09-2009, 08:39 PM   #2
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Hey Pros: Did my YJ gauge manometer fail me?


You can also check it with a clear plastic tube and some water. The pic is about 4/10ths down this page.
http://en.wikipedia.org/wiki/Manometer

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Old 04-09-2009, 08:49 PM   #3
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Hey Pros: Did my YJ gauge manometer fail me?


Might as well start a fire with flint and a rock...
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Old 04-09-2009, 08:55 PM   #4
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Hey Pros: Did my YJ gauge manometer fail me?


I use the same YJ..never failed me... Looks like you covered all the bases..You know those valves are really dumb ..No telling.. It should have operated correctly at 3.5'' wc..... So you say ignition wasn't delayed at all ?? It fired up as soon as the gas came out of the burners ?? Do ya'll have any 2 # gas systems up there ?? Or they all 6''- 7'' wc....
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Old 04-09-2009, 08:57 PM   #5
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Hey Pros: Did my YJ gauge manometer fail me?


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Might as well start a fire with flint and a rock...


That's a good 1 We call those water gauges... I have used them don't like them .Although they are accurate it you can add #'s
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Old 04-09-2009, 08:59 PM   #6
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When the flames shot out of the furnace the pressure was relieved. I had an older Heil where the idiot valve timing sequence screwed up. Started shooting gas in and THEN warming up the igniter. Did not want to wait for flame proving. Sold her a new furnace as the heat ex was in poor shape with the rivets bad etc etc. DO NOT stand in front of one of those if the customer says it starts with a bang. Probably a bad idiot valve. Lennox had some problems with the G20 Whisperheats (honeywell valve) shorting from MV to PV and starting with a bang. Energized the MV at the same time as PV and the spark.

Last edited by yuri; 04-09-2009 at 09:06 PM.
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Old 04-09-2009, 09:08 PM   #7
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I had an older Heil where the idiot valve timing sequence screwed up. Started shooting gas in and THEN warming up the igniter. Did not want to wait for flame proving. Sold her a new furnace as the heat ex was in poor shape with the rivets bad etc etc. DO NOT stand in front of one of those if the customer says it starts with a bang. Probably a bad idiot valve.
I never thought that could happen.

Like the man said "i don't know everything".

Part that don't jive is some times it would lit off normally.

This has got me so crazy now I am gonna call Honeywell.

Thanks Yuri.

Hey! Our Easter is Sunday. You getting a lamb?
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Old 04-09-2009, 09:16 PM   #8
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I like lamb but we usually have fish. As long as the women cook it I'm happy. I couldn't cook a decent meal to save my life. Had another horror story where I had 3 furnaces in a mech room. Tried firing mine up with the blower door off and holding the door switch in. BIG mistake. Continuos fan sucked the combustion air away and it blew back at me. Was checking for poor grounding/ loose wires once with burner running. BIG mistake, I interupted the grounding of a board, flame failed and came back on real quick before the valve could close. Blew back at me. I ALWAYS stand to the side now. Never to old to learn or get "re-educated".
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Old 04-09-2009, 09:22 PM   #9
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I like lamb but we usually have fish. As long as the women cook it I'm happy. I couldn't cook a decent meal to save my life. Had another horror story where I had 3 furnaces in a mech room. Tried firing mine up with the blower door off and holding the door switch in. BIG mistake. Continuos fan sucked the combustion air away and it blew back at me. Was checking for poor grounding/ loose wires once with burner running. BIG mistake, I interupted the grounding of a board, flame failed and came back on real quick before the valve could close. Blew back at me. I ALWAYS stand to the side now. Never to old to learn or get "re-educated".
~snicker~

I still remember my first experience with delayed ignition.

my wife didn't recognize me when i came home.

I got one of those busy Greek mustaches like you see in pics from the 1920s. It was all gone except for the hair under my nose. My wife called me Hitler til it grew back.
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Old 04-09-2009, 09:25 PM   #10
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I did oil back in the old days and learned to be VARY wary of oil or gas (delayed ignition) so I keep my distance. Have burned the hair from my knuckles a few times and torched myself with an oxy acetylene doing a compressor. Strange how you get more safety conscious as you get older.
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Old 04-09-2009, 09:27 PM   #11
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You lose an eyebrow, a mustache, all the hair on your arm.

You learn real quick where not to stand.

Hate when that happens.
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Old 04-09-2009, 09:33 PM   #12
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I did oil back in the old days and learned to be VARY wary of oil or gas (delayed ignition) so I keep my distance. Have burned the hair from my knuckles a few times and torched myself with an oxy acetylene doing a compressor. Strange how you get more safety conscious as you get older.
I'v gotten distracted and touched hot pipes after brazing. can't say as i ever had a run in with a torch flame.

Must hurt like blazes afterwards.

that's why i carry Vaseline on the truck. Great for keeping infection out of cuts and such when you can't stop work.
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Old 04-09-2009, 09:41 PM   #13
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It was a small tip/flame size fortunately. Actually it didn't hurt too bad. Went straight to a 3rd degree burn and the skin went white. Hurt later on when it peeled. Hurts way more when you touch hot pipes and get 2nd degree burns. I carry welding gloves now or use old winter gloves to grab hot pipes and keep my damn sleeves rolled down. 95% of the time that was the problem.
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Old 04-09-2009, 09:55 PM   #14
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my hands have Idiot Scars. Idiot cause i picked up the wrong end of a hot silfoss stick
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Old 04-10-2009, 07:04 AM   #15
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Quote:
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my hands have Idiot Scars. Idiot cause i picked up the wrong end of a hot silfoss stick
Not an idiot just a very easy thing to do when working. ouch!!!

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