AC noise

[wayne crews]

the AC unit in my salon work's fine but when i switch it to heat it works but makes a noise any idias

thanks
Wayne

[shrew]

Is it a chunka, chunka, chunka? Or more of a boing, boing, boing?

Maybe you could elaborate on the noise?

[Phillbo]

or a grr grr grr maybe

[mmwjr]

Interesting that in AC mode it doesn’t make this noise but when in heat mode it does. A reverse cycle heat is basically a heat pump so the only difference is the flow of the Freon is reversed.

As asked what does it sound like?

Can you trace the sound to a spefic component in the system?

[wayne crews]

Originally Posted by mmwjr

Interesting that in AC mode it doesn’t make this noise but when in heat mode it does. A reverse cycle heat is basically a heat pump so the only difference is the flow of the Freon is reversed.

As asked what does it sound like?

Can you trace the sound to a spefic component in the system?

it is like a grr grr grr

[mmwjr]

Originally Posted by wayne crews

it is like a grr grr grr

That sounds like a blower motor but that would be running in heat and AC modes. You should be able to find out the source by seeing which component is making the noise.

[shrew]

I think that the fan is a variable speed motor and steps up or down for heat and AC. The bearings might be going on the fan and at different speeds you might be getting a different sound. Like some weird harmonic resonance at just the right speed.

[Phillbo]

Actually it was me making the noise

I agree it may be the fan at a lower speed.