How do I hook up the wires when none of them are marked?
White is typically the 'common' or 'neutral' wire.
Green is a physical ground.
red and blue are 'hot' and generally control the fans speeds.
blue being low speed (usually)
red being medium (usually)
and both being high speed
this information is based on the 'typical' color coding. Some manufacturers deliberately dissent from following protocols.
to be certain you need a multi meter to check resistances, voltage points, and continuity.
with the unit disconnected from power, check the green wire to the fan casing and the motor housing. If either of these show 0 ohms, you have confirmed it is actually a ground wire.
with the unit disconnected from power, check resistance from the red to white and again from the blue to white. The lower of the two readings is slow speed; obviously the other would be mid speed.
with the motor disconnected from the speed selector switch, and power ON (please use caution) check the white wire to the other points of the switch, as you select each of the available speeds.
UNPLUG the unit after the test.
With your readings it should be evident where each wire should be connected. HOWEVER, if you have surmised wrong? be prepared for the unit, when powered up, to blow a circuit breaker. DON'T PANIC! simply unplug the unit, reset the breaker, make the obvious changes and try it again.
Of course it may be simpler and safer simply to replace the unit. Please don't hurt yourself over a few dollars.
Mar 06, 2015 |