On Wed, 14 Oct 2015 09:55:56 +0100, Bob Minchin
wrote:

wrote:


I've recovered an indoor part of an air conditioner with the wish to
turn it into a fan coil unit to heat a workshop. I have about 2 tonne
of 80C water to dissipate from a wood burner.

Manual at

http://nagyker.columbus-klima.hu/wri...BAB_24LUAR.pdf
and specifically page 12.

As this is an inverter model I was half expecting the motor to be
three phase but it now looks like it is a single phase ( 50Hz 42W 220V
on motor) with a remote start capacitor, and 3 sets of windings.

The three speeds look strange 540, 480 & 390 rpm.



Also apart from blue, purple, red, white and black wires to the motor
there are a second set of thinner black red and white wires pass to
the back of the motor.

I'm looking for insights as to whether I can run the fan without the
control board, on any one of the speeds, any ideas?

AJH

If the capacitor is a start cap (usually low power motor just has a run
capacitor), the the extra wires might be some sort of sensor to switch
the start capacitor out?

As it's 42W my guess is it is a run capacitor but looking at the
wiring the colours match the AUY24LUAR circuit which seems to have
white as a common and then red purple and blue being switched speeds.
The black is in series with the capacitor which is connected to the
white so that would be the out of phase winding to kick it in the
right direction.

The thing is why have an inverter model without taking advantage of
synthesising 3 phases for a true rotating field?

When I get back to it I'll connect neutral to the white and live to
the red and see if that works.

Speed of induction motor on 50hz =(6000/no of poles) - slip
Slip can get quite significant as the no of poles rise and the load will
change with fan speed too.

You might have 10, 12 and 14 poles based on those speeds?

Doesn't make a lot of sense to have that many poles does it?

AJH