I'm remembering a job I had a couple years ago. The upper middle
class lady noticed the AC wasn't blowing. She came downstairs and
found the breaker for the furnace off. Single pole, 15 amp. She
reset it, repeatedly, until the breaker stayed on.
What happened was the fan blower motor shorted. Five year old
furnace, a Bryant. Every time she turned the breaker back on, it
shorted through the motor. Finally a couple relays on the circuit
board vaporized, and that needed to be replaced, also.
I don't remember the numbers, but the parts really added up. Plus
the house call and three hours of labor.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.
"Jake" <***@verizon.net> wrote in message news:WPGKh.33$***@trndny03...
:
: Funny story... OT to the post but in the same genre.....
:
: I have a customer that has a 6.5 megawatt induction furnace for
melting
: steel.
:
: Two nights ago, during a furious rainstorm, a part of their
roof failed
: that happened to be directly above the power unit for this
furnace.
:
: The roof is less than 10 years old and developed a serious leak
around a
: exhaust fan. The roof drains were plugged.
:
: Anyhow... the power unit for an induction furnace this big is
: essentially a huge 'variable frequency drive'. Its capacitor
bank is 16
: feet long and 8 feet wide. The inverter section is another 8
feet long,
: has 24 platter size SCR's in it, and various control
components.
:
: I got a call-out that the Inverter buss was alarming on the -
(minus)
: side. That's all they told me. When I get there.... a steady
stream of
: water is cascading from the roof onto the power unit...
directly above
: the inverter section. No-one had turned the power off. The
operator told
: me he tried to 'reset' the unit multiple times but "it just
went BOOM
: BOOM BOOM... like a shot gun".
:
: I immediately opened the breakers, L/O'd the unit and told them
to fix
: the roof before I could do anything. They had to 'dump' the
furnace and
: get rid of 20 tons of steel at 2520 degrees. That was a
spectacle in itself.
:
: The first call was around midnight. It was 6 in the morning
before the
: roof was fixed, the water stopped falling, the furnace 'dumped'
and we
: had dried things out a bit.
:
: Our crew of 7 worked 18 hours on this project. Every SCR
assembly had to
: be dismantled and dried. 11 SCR's at $1,200 a piece had to be
replaced.
: Two tank capacitors.. big fellas... water-cooled jobs.. were
blown to
: bits... $6k there.
:
: The entire bill was $87,260. Because no-one turned the power
off when
: electrical components are exposed to water.
:
: Water and electricity don't mix. To the OP, be glad your
contractor
: wouldn't come out. They were protecting you and your equipment.
:
: Jake