90 amp heat pump

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Stevenfyeager

Senior Member
Location
United States, Indiana
Occupation
electrical contractor
a pole barn will be conditioned by a 90 amp electric heat pump, coupled with a 35 breaker outside unit. (the HVAC man tells me) A 125 anp sub panel would be a common breaker size and would suite the situation, location of both units and would equal the 90 + 35 exactly. Is that too close a match ? ( 80 feet of wire distance from main panel.) I asked the HVAC man if the 35 and 90 would ever be used simultaneously, he said yes, for some short term cycles.
Suggestions welcomed, thank you.
 
Is the 90a a 10- and a 5-kw strip heat? MCA rating?

What is the MCA of the outdoor compressor unit?

What wiring method and material are you using?
 
Usually the compressor is locked out if it gets too cold to produce heat, then the strips kick in. But with these new energy code requirements, I don’t know if they try to keep the heat pump active as long as they can? It might be two stage heat also, with the second stage energized when the compressor is locked out.
 
You should be o.k. The MCA on the air handler should be around 83 amps plus you condensor brings it to 112 amps.
 
I have installed a few 125A subpanels for just this reason. No problems with them. Actually, one HVAC guy (smarter than most) asked specifically for one.
 
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