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Lennox Pulse 21 Fan Control John 12-16-2006
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Posted by Bob_Loblaw on December 17, 2006, 11:00 pm
gofish@gonefishin.net wrote


> by golly Bob finally posts something I totally agree with.
>
> it must be the season. :)

If you're agreeing with me, then you're smarter than I've given you credit
for!
Cheers



--
Respectfully, Bob

Posted by Bubba on December 18, 2006, 12:09 am
On Mon, 18 Dec 2006 00:46:42 GMT, "Bob_Loblaw"

>
>
>
>
>> The "Pulse".................what a joke.
>
>I'm not a big fan of Lennox, but really, if you think about it, the Pulse
>was quite something in it's day.
>No ventor motor, 97% efficient, self sustaining ignition....
>Once the other models caught up to it in efficiency, or close to it, there
>was no need for it anymore.

Yes they were something, werent they?
Lets just quickly go over a few items of that marvelous wonder.
1) The sonz-a-biatch was heaver than a small car
2) It had 6 or 8 big bolts hiding that inducer motor you say wasnt
there to allow changing of a flimsey paper flapper
3) and on the subject of those bolts.......those damn things NEVER
freely turned out of there by hand. You had to ratchet ever single
inch of that thread to get that bolt out.
4) How about that wonderful vibration pad the whole unit had to sit
on.
5) How about those lovely canvas connectors you HAD to install on the
supply and return ductwork.
6) How about that lovely flexible gas connector you had to use.
7) What did you think of that HUGE muffler that had to be installed on
the pvc exhaust just to keep the noise down enough outside so that you
could only hear it running 3 houses away.
8) So what did you think of all that spacious room to change the spark
plug and flame rod with only a sense of feel and no visual.
9)and lastly that lovely water test of the heat exchanger.
YES, that Lummox Pulse was a true marvel. It earned the recognition of
placement in a museum.
I've heard "Daves" ass is up for the challenge.
Bubba

Posted by Bob_Loblaw on December 19, 2006, 9:08 am



> Lets just quickly go over a few items of that marvelous wonder.

> 2) It had 6 or 8 big bolts hiding that inducer motor you say wasnt
> there

Aha! Gottcha! :-)
It wasn't a ventor motor.
It was a purge blower.
It only ran on start-up to get fresh air into the chamber, then it shut off
for the rest of the heating cycle.
If it was a windy day, it sometimes wasn't needed for ignition due to the
venturi effect.



>to allow changing of a flimsey paper flapper

I never found them flimsy. Those air flappers needed to be changed every 5
to 7 years.

All the rest is true, as far as mufflers and vibration connections,but they
were still pretty impressive for their day,
including the ignition system, which only ignited the first couple of
pulses, after which the ignition was caused by the refraction of the
combustion gases.
One thing that was very poorly designed was the access, or lack thereof, to
the spark plug and sensor.
I bought a special tool for around $50, that was no more than two socket
heads welded onto a bar with a half-inch drive hole in it for your socket
wrench that made the job a little easier, but what a pain in the ass it
was.
If you ever come across one that seems to light intermittently, and you've
ruled out a bad exchanger, try removing the ignitor, then take a 1/4" drill
bit and insert it through the ignitor opening, straight across to the other
side of the exchanger, and ream out the gas eustation tube.It will get a
build-up of crud on the lower edge of the tube, which deflects the gas
upwards and away from the ignitor.
Of course, all of this is done using the Braile method, because you can't
see any of it inside the access panel! :-)
Built to work , not to work on!


--
Respectfully, Bob

Posted by Bubba on December 19, 2006, 4:27 pm
On Tue, 19 Dec 2006 14:08:16 GMT, "Bob_Loblaw"

>
>
>
>> Lets just quickly go over a few items of that marvelous wonder.
>
>> 2) It had 6 or 8 big bolts hiding that inducer motor you say wasnt
>> there
>
>Aha! Gottcha! :-)
>It wasn't a ventor motor.
>It was a purge blower.
>It only ran on start-up to get fresh air into the chamber, then it shut off
>for the rest of the heating cycle.
>If it was a windy day, it sometimes wasn't needed for ignition due to the
>venturi effect.
>
Vent motor, purge blower......its still a 2nd motor on a furnace that
goes bad.
So you're saying that on a windy day your purge motor doesnt come on?
Hmmm, I seemed to miss the pressure switch that controlled that
feature. Maybe it has a hidden misting feature for cool heat that I
didnt read about too? :-)
Bubba
>
>>to allow changing of a flimsey paper flapper
>
>I never found them flimsy. Those air flappers needed to be changed every 5
>to 7 years.
>
>All the rest is true, as far as mufflers and vibration connections,but they
>were still pretty impressive for their day,
>including the ignition system, which only ignited the first couple of
>pulses, after which the ignition was caused by the refraction of the
>combustion gases.
>One thing that was very poorly designed was the access, or lack thereof, to
>the spark plug and sensor.
>I bought a special tool for around $50, that was no more than two socket
>heads welded onto a bar with a half-inch drive hole in it for your socket
>wrench that made the job a little easier, but what a pain in the ass it
>was.
>If you ever come across one that seems to light intermittently, and you've
>ruled out a bad exchanger, try removing the ignitor, then take a 1/4" drill
>bit and insert it through the ignitor opening, straight across to the other
>side of the exchanger, and ream out the gas eustation tube.It will get a
>build-up of crud on the lower edge of the tube, which deflects the gas
>upwards and away from the ignitor.
>Of course, all of this is done using the Braile method, because you can't
>see any of it inside the access panel! :-)
>Built to work , not to work on!

Posted by Bob_Loblaw on December 19, 2006, 6:59 pm



> Vent motor, purge blower......its still a 2nd motor on a furnace that
> goes bad.
> So you're saying that on a windy day your purge motor doesnt come on?

Nope.Not what I said.
I said it isn't necessary for ignition if the wind is right.


> Hmmm, I seemed to miss the pressure switch that controlled that
> feature. Maybe it has a hidden misting feature for cool heat that I
> didnt read about too? :-)


Nope. It's a normally CLOSED pressure switch, the only one that I know of.
I'll let you figure out the rest. :-)



--
Respectfully, Bob

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