carrier chiller

any body know what a 19FA chiller sounds like when it phase rotation is wrong?

UH not good??

Some centrifugals won't run (long) in reverse rotation. Others will do a surprising amount of tonnage when running backwards. I've had the pleasure of diagnosing a handful of machines that were placed into operation in reverse and left that way, one of them for several years. That one in particular did 6.5* out of a rated 10* delta T when running with the vanes wide open at rated FLA (or as close as it would get). It also had some SERIOUS discharge superheat going. As far as unusual noise, they've all sounded somewhat odd, but not enough so that I would have said that there was a problem in the compressor just because of the sound. That said, I've never had an FA with that problem, so I can't say specifically, just generally.

If it's a 19 FA you should be able to check rotation on spin down through the S/G at the end of the motor. Or use the S/G on top of the gear case.

If the rotation is wrong, it'll make a noise like "WEEEEEEEEEEEE..."
:LOL:

If he were asking about a 17FA, I would be worried.

phase meters are cheap.

There's a sightglass on the motor shell. Look in the glass when the motor is STARTING. Rotation is clockwise.

isnt there a phase monitor on the machine??