what is the method for varying the fan speed in air conditioner?

[tongtong]

I mean the principles for it, for example, variable frequence or number of poles.

[Edited by tongtong on 05-12-2004 at 01:33 PM]

[spike]

one should remember their manners, such as 'please' and 'thank you'...

[Dowadudda]

Penn Controller P66 will ramp up or ramp down a condneser fan to maintain a certain dishcharge. Thats for your smaller stuff. Anything over 5 horse and you'll need a frequency drive (inverter).

[tongtong]

The variable speed fans is usually small fans in air conditioner. Some people say varying its speed by changing the number of poles, but others say by changing the winding resistance then getting different slip speed. I am confused with that. Explain it for me! Please! Expert in this field.

[spotts]

it's magic!

[me75006]

pulse width modulation.

[tongtong]

I already understood the basic principle for motor speed varing. If someone want to get the answer, I'd like to post it. By the way, I do not think the " site supporter' way is a better way for everybody. And I guess he may be not know the right answer exactly.

[Boiling Point]

Lets see - you sign up and post a question without being very clear of what you are looking for and then you criticize the site. Not a very smart move on your part. I see you have no profile, you a student or home owner??? What are you looking for??? Are you saying you are a "expert in this field"??

[coolwhip]

Hey ping pong... say pretty please.

[chillbilly]

Depends on the model chosen. Some manufacturers hace plug-in style speed taps for multi speed blowers and some require a manual splice by the tech. On variable speed types, there are several different selections for varying the RANGE of CFM for enhanced and heating modes.

[Edited by chillbilly on 05-29-2004 at 08:45 PM]