Heat Pump Calculated Load

[tryinghard]

Heat pump nameplate includes circuit #1: compressor RLA 28.2, motor out 2.8, and motor in 3.10. It also lists circuit #1 minimum circuit amp 67.2.

?05? 440.4(B) says ?The ampacity shall be calculated by using part IV??

Q: what is the minimum size load for calc purposes with the information from the nameplate above?

 

[augie47]

makes no sense (to me), unless there is heat involved also. 67.2 with 5 kw worth of heat added to your numbers would be about right. Hopefully someone else sees something I don't.

 

[tryinghard]

Heat strips are noted as circuit #2 and listed with min circuit 26A. I don't have the heat KW at hand.

 

[augie47]

Now that males sense...
If Ckt 1 is siongle circuit...
28.2 x 1.25 = 35.25 + 2.8 = 3.1= 41.15 + 26 = 67.2

It would be my thoughts that Ckt 1 is describing a single circuit feeding the equipment...

 

[tryinghard]

Okay, so this minimum circuit amp of 67.2 would also be used for calculating purposes for my feeder right. In other words it will be used for the circuit conductor size as well as the VA calc load (16,128 VA for single phase 240)?

 

[augie47]

Okay, so this minimum circuit amp of 67.2 would also be used for calculating purposes for my feeder right. In other words it will be used for the circuit conductor size as well as the VA calc load (16,128 VA for single phase 240)?

in my opinion, that is correct