Lights dim with swamp cooler.
In article ,
Dave, I can't do that writes
Hi, we recently installed a window version of a swamp cooler. As such, it plugs
into a wall outlet in the lounge-room. It has a new 1/3-hp (252-Watt) two speed
motor from HomeDepot.
When it turns on either in Low or High, the voltage dips for almost a second
from 125vac to 117vac then back up to 125vac. The dimming is maybe 20% longer
for the High speed.
Is there some way we can soft-start this or what? It makes the lights dim in the
house for that short period.
Before anyone launches into "house wiring," etc rest assured it is 11-years old,
copper, in metal conduits and all up to code with 200-Amp coming into the house.
I used a 14g, 3-wire extension lead in a bunch of other outlets on different
circuits and still get the same issue. I then hard wired the extension into the
main breaker panel. Same again.
I have cleaned and oiled the fan bearings, adjusted the belt and the fan turns
quite freely by hand.
What can be done to alleviate this momentary voltage drop?
Thanks
I wonder if a suitable thermistor (ntc), wired in series with the motor
would do the job simply and cheaply? E.g. EPCOS B57127P0109M301
--
Chris Holford
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