Load calculation for Heat Pump

[ElectDesigner]

I was looking at the spec sheet for a heat pump, they have a 12kW input rating under the rated cooling section and 13kW under rated heating ( this was a 208V,3Ph unit ), is this the actual load if not what do they represent? I.e. do I just take the bigger of the two (i.e. 13kW),

I remember that the there was a current rating(cant remember if it was fla or mca or rla) as well, for loading do I go 208x1.732xcurrent rating ?

As a rule of thumb to get a general idea of the load on a mechanical unit which current value does one take to multiply with voltage and 1.732?

 

[augie47]

To be accurate, I'm afraid you might need to refer to the manufacturers cut sheet or nameplate data.
Some 3 phase units have single phase motors which will cause some current discrepancies, also, different units may allow a portion of the heat to operate in conjunction with the compressor so it's not always and either/or load..

208X 1.732 would give you the equivalent 3 phase voltage so you can get some idea.

 

[jumper]

In short you need 2 things off the nameplate. MCA determines conductor size and MOCP determines breaker or fuse size. The manufacture should provide all that.

Gus was quicker.

And voltage, freq, and phase. I added this before someone nails me.