[Yaesu] Furnace, related noise?

Sat, 17 Jan 2004 15:16:30 -0600

Thanks for all the replies, even the off the wall ones were at least fun to
read, entertainment value is good too! HI HI

It's working fine and the noise is gone today.  It turned out to be a stuck
relay, I found it easy enough when it was the only relay that was
uncomfortably warm to the touch.  I'm not a total furnace novice, I rebuilt
this one last winter, the heat exchanger cracked and needed to be replaced,
and in the process the rebuild kit from the manufacture also included all
new controls that had to be wired in, good thing im handy at reading a
schematic!  Wouldn't you know it, one of those newfangled control relays was
the problem!  On an oil fired furnace the fumes let you know really fast
that something is wrong, smells like a diesel truck running in the basement,
unfortunately I have heard of people having problems with gas furnaces and
they didn't know anything was wrong until they nearly died of carbon
monoxide.

Anyway, it appears as if the stuck relay was arcing internally, and after
replacing it the noise and weirdness of operation went away.  Good thing I
have some spare parts for it, back when it first went up in smoke I stashed
all the parts that were replaced one by one in a failed attempt by the
repairman to find the problems.

73,

Scott, KB0NLY

PS: I have heard of a furnace exploding before, hence the smoke alarm, temp
alarm, and fire extinguishers in the basement!

----------------------------------------------------------------------------
----
All outgoing/incoming mail scanned by Norton AntiVirus 2004 Professional.

----- Original Message ----- 
From: "John Kostiw" <[email protected]>
To: "'Scott L.'" <[email protected]>
Sent: Saturday, January 17, 2004 2:28 PM
Subject: RE: [Yaesu] Furnace, related noise?

> Try disconnecting the thermostat wires at the furnace, you could have an
> intermitant short in the thermostat wires.  John
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Scott L.
> Sent: Friday, January 16, 2004 11:35 PM
> To: Yaesu Reflector
> Subject: [Yaesu] Furnace, related noise?
>
>
> Ok, this is not necessarily 100% Yaesu related, but the affected radio is
a
> Yaesu!!
>
> An interesting problem started tonight, my oil fired forced air furnace
> started acting weird.  At about the same time I noticed an increase of
> interference on 6m on my FT-847.  The noise blanker seems to knock it down
> enough to be only a minor nuisance, but I wonder what the cause is.
>
> If anyone here is familiar with oil fired furnaces they will understand
> this.  The burner runs, and I think it runs until the high temp cutoff
shuts
> off the burner because the blower doesn't turn on all the time.  At first
I
> thought perhaps a bad relay or something, and that was also the cause of
the
> received noise, but the odd thing is that I removed the thermostat from
the
> mounting plate, its a digital one that is removable for programming and
> battery changes, and the burner still keeps firing!  Well since the
> thermostat is not in place to close the contacts to the low voltage relay,
> which should be responsible for firing the burner, why would the burner
> fire?
>
> So I thought about it a bit and replace the thermostat and set it just
above
> room temp, the furnace fired, and after the usual warm-up time the blower
> ran, so it seems to operate normally under thermostat control, but every
now
> and then the burner still fires up all on its own.  I thought at first
maybe
> I was causing interference to it by transmitting, so I shut the radios
off,
> removed the thermostat from the wall, and went down in the basement with
> thermostat and chair in hand to sit and watch it for a bit.  Sure enough,
> the darn thing fired up all on its own, it ran the burner until it reached
> the overtemp sensors rating and then it shut off.  It stay off until its
> cool, cool enough that you can touch the front of the heat exchanger and
> keep your hand on it, I would say just above room temp, than 10-15 minutes
> later it does it all over again! I never had the noise before which leads
me
> to believe that something died on the furnace, but it does function like
it
> should when it called for heat, it just doesn't know enough to stay off!
>
> Gremlins?  The last thing I need is to start replacing parts on a furnace
> and fighting receiver interference with only a week away to the big VHF
and
> up contest.
>
> Any experience HVAC guys out there that know what the heck is going on
here?
> I will probably get someone out to look at it the beginning of next week,
> but I want an idea of what is wrong before he gets here.  Those repair
guys
> are always on such a tight schedule, and I want to make sure its fixed the
> first visit, otherwise I will be using a space heater next weekend so it
> doesn't interfere with the radio!! HI HI
>
> 73,
>
> Scott, KB0NLY
>
>
> --------------------------------------------------------------------------
--
> ----
> All outgoing/incoming mail scanned by Norton AntiVirus 2004 Professional.
>
>
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment.  Attachments are not allowed.  To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html  ---
>
> Moderator: Ray Brown, KB�STN
> _______________________________________________
> Yaesu mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/yaesu
>
>
>
>