Am I reading this right?`

[David Meiland]

Brand new Carrier heat pump. The sticker seems to indicate that power is to be single-phase, but that the compressor and fan are 3-phase. I don't look at these too often, especially not newer ones. I assume this has something to do with it being inverter drive. Can anyone clarify?

Click to Enlarge

82.29 KB

[Jim Katen]

Brand new Carrier heat pump. The sticker seems to indicate that power is to be single-phase, but that the compressor and fan are 3-phase. I don't look at these too often, especially not newer ones. I assume this has something to do with it being inverter drive. Can anyone clarify?

Click to Enlarge

82.29 KB

Sorry, no idea. But I'd love to hear an explanation from Carrier.

[Marc]

Beats me.

Marc

[inspector57]

No idea but I think your onto something in considering the variable speed utilizing 3 phase.

I did find this when googling "Carrier Nomenclature 25vna"

http://dms.hvacpartners.com/docs/1009/P ... A-01PD.pdf

[inspector57]

This diagram seems to confirm the inverter theory.

http://s7d2.scene7.com/is/content/Watsc ... df?fmt=pdf

[Marc]

It's an inverter-powered compressor alright. Has two windings but that could be either start/run windings or two of the three phase windings (don't need all three).

Can't make any sense about that OFM (outdoor fan motor) though. They're usually 3 wire devices and this one has 4 wires, so I dunno what's going on. The diagrams don't say much.

Marc