[Yaesu] Furnace, related noise?

Sat, 17 Jan 2004 08:43:59 -0500

Scott, call a furnace repairman first before you need an insurance man and
look for the noise after the furnace is fixed...de gary, kd9sv

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Scott L.
Sent: Saturday, January 17, 2004 1:35 AM
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

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