The quick fix after all that:

Remove label which says Model # XXXXX Air Handler S/N XXXX.

Replace with label which says Model # XXXX Vacuum former and meat slicer
S/N XXXX


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of llile@SALTONUSA.COM
> Sent: Tuesday, August 27, 2002 7:31 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: The joys of electronics
>
>
> We built a new air handler for a large office building.  The air handler
> had a 200 HP fan motor, which delivered 80,000 CFM at high pressure (5"
> static).  I got involved when we had to install a variable frequency drive
> to run the 200 HP motor, and interlock it with the HVAC controls.
>
> Now this was one of the bigger air handlers the contractor had built.
> Picture this, an airtight box, maybe 50 feet long, with a fan at one end
> sucking air out of the box, various filters and cooling coils inside, and
> a big wall of dampers at the other end.  The dampers selected between
> outside air and return air, and the controls picked whichever one used the
> least energy to cool.
>
> Now one or the other damper *must* be open at all times, and one of my
> jobs was to build the interlock that made this happen.  My stuff worked
> fine, but the contractor put tiny little motors on the dampers.  I was
> *inside* the air handler when the inevitable occurred.  The 200 HP fan
> kicked on, and both dampers remained closed.  The walls began buckling,
> and the whole wall of dampers began to move toward me with a noise like a
> bulldozer was coming through them. .  I had to hit the door (which opened
> OUT) with my shoulder a few times to get out of there alive.  I ran is
> slow motion like one of those dream sequences in the movies to slam the
> panic switch on the motor controls and shut the whole system down.
>
>
> -- Lawrence Lile
>
> --
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