On Saturday, July 24, 2010 02:05:09 pm j...@coats.org did opine:
> https://docs.google.com/document/pub?id=1211nA9BptGnlqCpwWek8AB0kQUjXfT2
> UFTalaCKAVBA
>
Link leads to a sign up page...
> OK, I got a motor from an old HVAC system and it is working. How do I
> wire it to run (yea slowly and
> less efficiently) off 110V 1ph instead of 220V 1ph?
>
> Since this is off topic, please respond directly to me. If you want to
> know the answers I receive,
> email me directly and I will let you know.
Not that far off topic Jack. Anyway, motors from HVAC stuff tend to be
capacitor run motors, so I would open the terminal plate on the motor,
which may have a diagram on the inside as to how to do it. If that, or the
HVAC gear it came from do not furnish sufficient clues, a single phase 250v
circuit is as close as your houses service box and therefore not really a
major operation to get 250v to it.
Bear in mind that to get the same power once its running on 127v, (127 or
2x for 254 is the std wall plug voltage here in the US and has been for
around 30 years now) the supply wiring will need to be 4 times bigger for
the same ohmic losses. So if it ran on a 14ga 250 circuit before, it will
need a 10ga 127 circuit now in order to have the same wattage loss in the
wiring and the same power from the motor.
That of course is being technically correct, but a 12ga circuit will run it
just fine with a very small power loss, generally undetectable. ;-)
Oh, and some of those will need a different capacitor, and that would serve
to reduce the apparent diff in cost between converting it, and just running
a 254v line to it which would not mean a new capacitor is needed. That is
127v from each side to the neutral.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
All men profess honesty as long as they can. To believe all men honest
would be folly. To believe none so is something worse.
-- John Quincy Adams
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