3-phase for AC compressor

[JB Thompson]

Has anyone ever come across an AC compressor wired for 3 phase? This home was built in 1960 and was wired for this.

This compressor was installed in 1998 and converted.

An enigma?

Here's a photo of the breaker.

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[Jerry Peck]

Frequently on older homes (1950s, 1960s vintage) in South Florida.

[JB Thompson]

Really? why?

[Jerry Peck]

Really? why?

Because 3-phase has advantages for motor efficiencies.

[JB Thompson]

Spoke with my electrical engineer friend this evening, he said that the motors are substantially cheaper and they run better in 3 phase (just as you said).

Thanks

[john_opwin]

I agree with Thompson A.C requires 3 phase to run efficiently. though it could be run on 2 phase but there will be lot of fluctuation problem