[Zeigh]

Hello,

Could someone help me figure out how to read this label and then convert what the VA is of this unit (adding an unrelated sub-panel to my home)? I have the calculation method, but just need what data to input.

Do I use actual volts on the label or average 2-pole voltage of 220? Do I use the minimum amps listed or maximum potential of the 50 amp breaker size.

BTW, this is also a geothermal unit, and I am still trying to corner details on how the NEC views them since they aren't a traditional heat pump. Anyone who is knowledgable in this additional detail please chime in.


Peace,
Dr. Z.

 

[ez2wire]

Minimum Circuit Ampacity:35.8A, you need #8 wire.

Max Breaker Fuse or Breaker: 50A, you can use up to a 50A breaker or fuse, max size recommended.

 

[ez2wire]

Did you order a heater package for this unit? That info is on the name plate also.

 

[Zeigh]

Minimum Circuit Ampacity:35.8A, you need #8 wire. Max Breaker Fuse or Breaker: 50A, you can use up to a 50A breaker or fuse, max size recommended.

Thanks for responding, but my question is what the VA load is for calculation in adding a sub-panel to the main panel that this geo unit is already installed into.

 

[ez2wire]

Thanks for responding, but my question is what the VA load is for calculation in adding a sub-panel to the main panel that this geo unit is already installed into.

35.8A x 240V = Total VA

If you have a heater package, add that also.


220.5 Calculations.
(A) Voltages.
Unless other voltages are specified, for pur-
poses of calculating branch-circuit and feeder loads, nomi-
nal system voltages of 120, 120/240, 208Y/120, 240, 347,
480Y/277, 480, 600Y/347, and 600 volts shall be used.


(B) Fractions of an Ampere.Calculations shall be permit-
ted to be rounded to the nearest whole ampere, with deci-
mal fractions smaller than 0.5 dropped

 

[Zeigh]

Thanks for that clarification. Now next question...

I have a remodeled 1800 square foot garage that will have its own sub-panel including the following:

- 4, 20 amp circuits
- 2, 15 amp circuits

I have also used 6 gauge wire for two separate 240 volt appliances, but no breaker yet since I don’t actually know which items will be purchase. Does anyone have a general rule of thumb for what the VA will be for a novice arc welder and single stage 60+ gallon compressor? Once again, I am trying to determine what overall sub-panel breaker size to initially use with the expansion. I will be cutting it close with a 3640 square foot house and 200 amp service.


Peace,
Dr. Z.

 

[ez2wire]

Thanks for that clarification. Now next question...

I have a remodeled 1800 square foot garage that will have its own sub-panel including the following:

- 4, 20 amp circuits
- 2, 15 amp circuits

I have also used 6 gauge wire for two separate 240 volt appliances, but no breaker yet since I don’t actually know which items will be purchase. Does anyone have a general rule of thumb for what the VA will be for a novice arc welder and single stage 60+ gallon compressor? Once again, I am trying to determine what overall sub-panel breaker size to initially use with the expansion. I will be cutting it close with a 3640 square foot house and 200 amp service.


Peace,
Dr. Z.

Google a few models and see what are the amperages. Only you really know what you probably want. Random guesses are worthless.

Unless you house is mostly or all electric, I doubt you are cutting it close. Look at your past electric bills for a year and you can calculate your usage.

 

[dmxtothemax]

- 4, 20 amp circuits
- 2, 15 amp circuits

what the VA will be for a novice arc welder and single stage 60+ gallon compressor? Once again, I am trying to determine what overall sub-panel breaker size to initially use with the expansion. Dr. Z.

We need more details, check the ratings plate on the welder it will say what current is required.
Ditto for the compressor, we at least need the hp of the motor, but the ratings plate will be more specific.

Also what loads do you envision for the 6 other power circuits ?
without more I would guess 100A for sub panel.

:vs_cool:

 

[jreagan]

Do you have the soft-start? I will be lower on that label.

That is a WaterFurnace Geo unit? (I have one also but I also have the DSH option).

I have a 15Kw heater pack on mine.

Total of 3 circuits. 50A breaker for the compressor & pumps and a 60A/30A pair for the heaters. When you have heater packs installed, the blower fan runs off the heater pack circuits so you can still get emergency heat if the compressor ever dies.

 

[Zeigh]

Thanks for everyones help. I was able to get enough of an answer here and to help with further research. This should allow me to handle a building inspector soon.


Peace,
Dr. Z.