[Yaesu] Re: Yaesu digest, Vol 1 #687 - 1 msg

Sat, 17 Jan 2004 16:41:23 +0000

I'll suggest you check one thing, and then you need to
call a heating repairman:
I would assume that you have an older furnace.  This will 
have a probe going into the plenum that will have two 
thermal switches.  One is the hi-tep shutoff, the other, 
set
at a much lower temp cycles the fan.  If you have any
question as to its relibality, replace it.  They are not
that expensive.  Good luck and don't let this go too long.
Dave
WA0ZZG

On Sat, 17 Jan 2004 04:10:02 -0500 (EST)
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>Today's Topics:
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>   1. Furnace, related noise? (Scott L.)
>
>--__--__--
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>Message: 1
>From: "Scott L." <[email protected]>
>To: "Yaesu Reflector" <[email protected]>
>Date: Sat, 17 Jan 2004 00:35:06 -0600
>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!=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
>
>
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