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'[EE]: Furnace warning sound'
2012\01\08@153922 by Carl Denk

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I have a standby 240 volt electric resistance furnace with 24 VAC controls. Since the electricity costs are large, and usage due to some minor item failure on the main fuel supply, I am looking for an brief beep audible warning when the unit is powered up. The sound should be very brief (maybe a second or less), not an unpleasant tone or high volume. The unit is in the basement, and should be able to hear it on the 1st floor. This should be just barely heard, so as not to startle, or might even choose to ignore for the moment. Cost not a priority since this is one off.

I have thought of using a 555 timer, with a rectifier bridge and a 78XX regulator off the 24 VAC circuit and a sonalert sort of noise maker. Also have thought of a relay that opens it coil circuit when energized, and then something to keep the circuit open until next furnace usage.

Any thoughts would be appreciated, and thanking in advance. :)


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2012\01\08@160013 by Matt Bennett

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On Sun, January 8, 2012 2:39 pm, Carl Denk wrote:
> I have a standby 240 volt electric resistance furnace with 24 VAC
> controls. Since the electricity costs are large, and usage due to some
> minor item failure on the main fuel supply, I am looking for an brief
> beep audible warning when the unit is powered up. The sound should be
> very brief (maybe a second or less), not an unpleasant tone or high
> volume. The unit is in the basement, and should be able to hear it on
> the 1st floor. This should be just barely heard, so as not to startle,
> or might even choose to ignore for the moment. Cost not a priority since
> this is one off.
>
> I have thought of using a 555 timer, with a rectifier bridge and a 78XX
> regulator off the 24 VAC circuit and a sonalert sort of noise maker.
> Also have thought of a relay that opens it coil circuit when energized,
> and then something to keep the circuit open until next furnace usage.
>
> Any thoughts would be appreciated, and thanking in advance. :)

If the thermostat for the Electric Resistance Furnace is on the first
floor, why not something that detects current in the lines that close when
the furnace is on?  My heat pump has an LED that lights up when the
auxiliary coils are in use- in a darkened hallway, I've found that an
indicator light is pretty obvious. Plus the light could be on continuously
as a reminder, not just when it cycled.


Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with

2012\01\08@162814 by Carl Denk

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I tried to keep it simple, but here's the rest of the story. :)
The house has 4 heating/cooling zones, each with it's own thermostat. Any one or all can call for heat at one time. The other fuel supply is our own gas well, which can in very cold windy weather be depleted temporarily. A PIC at the well sends the gas pressure and other data via fiber optic/RS485 to a PLC (Industrial control computer). The PLC changes the thermostat wires after the zoning and before the gas and electric furnaces between the furnaces as needed. The only item of interest now is: "Is the electric furnace energized". Now that I think of it, I have a couple of spare CAT-5 pairs between the electric furnace and the PLC. I could put a relay powered off the control circuit in the electric furnace control enclosure, close the contacts to signal the PLC, and program the warning buzzer for a few mil-seconds or so. But I kind of am looking for keep it simple solution. By simple, I mean everything local to one area.
As far as other problems that could bring on the electric furnace: Pressure sensor, PIC PCB, communications failures, etc.

:) :)

On 1/8/2012 4:00 PM, Matt Bennett wrote:
{Quote hidden}

>

2012\01\08@164507 by William \Chops\ Westfield

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On Jan 8, 2012, at 12:39 PM, Carl Denk wrote:

> Any thoughts would be appreciated

re-purpose a "wireless doorbell" ?

BillW

2012\01\08@165759 by Sean Breheny

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Am I the only person who saw an attachment to this email which has
nothing to do with this email but rather was supposed to be attached
to the other thread: "[EE]: Single power supply, true-AC-input analog
to digital interface" by Electron?

I don't know if Gmail messed up (I use Gmail) or if the list did, but
I see a GIF of a schematic attached to BOTH this message and
Electron's.

Sean


On Sun, Jan 8, 2012 at 3:39 PM, Carl Denk <spam_OUTcdenkTakeThisOuTspamwindstream.net> wrote:
{Quote hidden}

>

2012\01\08@171324 by Electron

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I indeed noticed that too. :o


At 22.57 2012.01.08, you wrote:
{Quote hidden}

>> -

2012\01\08@172407 by David Neale

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You were not alone I got it as well. Spooky.


Dave

On Jan 8, 2012, at 2:57 PM, Sean Breheny wrote:

{Quote hidden}

....snip..

2012\01\08@173728 by Carl Denk

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Me too, and without looking at the title, I started to reply, that it wasn't my diagram. My other thread on the Mosfet had a JPG attached that was rejected by the list as being too big message. I added the text description of the simple circuit to help clarify. :)

On 1/8/2012 5:24 PM, David Neale wrote:
{Quote hidden}

>

2012\01\08@174002 by Carl Denk

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Thanks, but the area is very accessible, and I prefer to stick with wire, maybe less than a couple of feet in the control enclosure.

On 1/8/2012 4:45 PM, William "Chops" Westfield wrote:
> On Jan 8, 2012, at 12:39 PM, Carl Denk wrote:
>
>    
>> Any thoughts would be appreciated
>>      
> re-purpose a "wireless doorbell" ?
>
> BillW
>
>

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