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Furnace is blowing bus fuses Mitch 06-26-2007
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Posted by Mitch on June 26, 2007, 3:43 pm
I never blew a bus fuse in the 7 years I've lived here.
I blew one over the winter, and one blew today.

Anything I can check before calling for service?

I cleaned the filters about 2 months ago.
Would clogged filters cause the blower to work hard enough to blow the
fuse?

Posted by Meat Plow on June 26, 2007, 4:48 pm
On Tue, 26 Jun 2007 19:43:52 +0000, Mitch wrote:

> I never blew a bus fuse in the 7 years I've lived here.
> I blew one over the winter, and one blew today.
>
> Anything I can check before calling for service?
>
> I cleaned the filters about 2 months ago.
> Would clogged filters cause the blower to work hard enough to blow the
> fuse?

It could but less likely than a failing motor. Is the motor direct drive
(inside the blower) or belt driven? It's probably something that someone
with an Amprobe (clamp on ammeter) would need to test how many amps the
blower motor is drawing and if it increases past what its full load rating
is as it runs.



Posted by Just Joshin on June 26, 2007, 5:02 pm

>I never blew a bus fuse in the 7 years I've lived here.
>I blew one over the winter, and one blew today.
>
>Anything I can check before calling for service?
>
>I cleaned the filters about 2 months ago.
>Would clogged filters cause the blower to work hard enough to blow the
>fuse?


Funny you mention a clogged filter. I watched a tape in class about
how amps = work (with a constant voltage and resistance). So in the
example they had a vaccum. They showed it running and it's amp draw,
and then clogged up the hose. The amps went down. Since the fan was
moving less air, it was doing less work, therefore was drawing less
amps. Where the problem comes from with clogged filters, is a dp
accross the fan, and ofcourse a lower system effeincy.

So now to your point. Do you have anything on the same circuit? Is
your fuses time delayed?

tom @ www.BlankHelp.com


Posted by mm on June 26, 2007, 8:21 pm
wrote:

>
>So now to your point. Do you have anything on the same circuit? Is
>your fuses time delayed?

A friend told me how they blew a breaker when they ran their toaster
oven and microwave at the same time. Ok, no biggie, for them or me.

The problem was that they didn't notice that the breaker was tripped
for a full day, when they opened the fridge and the ice was water.

So the fridge was on there too! When she told me the story, she still
didn't see that as a problem.

I don't know if the breaker is 15 or 20, but apparenly it has only
tripped this one time, even though wouldn't it trip of if the toaster
oven wsa on when the fridge started up? This is the same family I'm
alsways asking questions about, so this time, regardless of the
answer, I'm leaving them on their own. :)


Posted by Mark Lloyd on June 26, 2007, 10:34 pm
wrote:

>wrote:
>
>>
>>So now to your point. Do you have anything on the same circuit? Is
>>your fuses time delayed?
>
>A friend told me how they blew a breaker when they ran their toaster
>oven and microwave at the same time. Ok, no biggie, for them or me.
>
>The problem was that they didn't notice that the breaker was tripped
>for a full day, when they opened the fridge and the ice was water.
>
>So the fridge was on there too! When she told me the story, she still
>didn't see that as a problem.
>
>I don't know if the breaker is 15 or 20, but apparenly it has only
>tripped this one time, even though wouldn't it trip of if the toaster
>oven wsa on when the fridge started up? This is the same family I'm
>alsways asking questions about, so this time, regardless of the
>answer, I'm leaving them on their own. :)

My toaster is on a different circuit, but the microwave and
refrigerator are on the same circuit (the most convenient outlet was
there). They've been that way for around 5 years with no problem.
--
Mark Lloyd
http://notstupid.laughingsquid.com

"Never underestimate the power of stupid
people in large groups"

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