[Yaesu] Furnace, related noise?

[Scott L.]

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!=20

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  ---