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Wiring to air handler/heater

misterfixit

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Feb 9, 2013
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199
Location
Kaufman Texas
I'm installing a central heat and air in my detached shop. This is a heat pump unit, the indoor air handler has electric heat strips added to it. The heat kit has a 60 amp breaker inside the cabinet. I assume I need to run more than 60 amps for this air handler, if so how much?
 
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wyliesdiesels

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Aug 14, 2012
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20,030
Location
Modesto, CA
Need to know the MCA- min circuit amps and MOCP- max overcurrent protection

Size the wire by the MCA.
Size the breaker (or fuse) by the MOCP.

These 2 figures should be listed on the nameplate.
 
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misterfixit

Well-known member
Joined
Feb 9, 2013
Messages
199
Location
Kaufman Texas
Need to know the MCA- min circuit amps and MOCP- max overcurrent protection

Size the wire by the MCA.
Size the breaker (or fuse) by the MOCP.

These 2 figures should be listed on the nameplate

Thanks. Issue is there are two plates, one for the air handler which is basically just the fan, and the add on heat kit.
The air handler plate says min circuit ampacity 2.2 amp, with minimum overload protection 15 amp.
The heat kit is 9.6kw@240v, the plate lists 40amps, 56 MCA, and 60 MOP.

Do I need to go to a 70amp breaker and #6 thhn?
 

Terry D

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Mar 25, 2015
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2,202
Location
St. Louis, MO.
60 amp breaker and #6 wire. The 60 amp breaker in the unit sees both the heat and blower loads.

They already figured it all in by putting a 60 amp breaker in it
 
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misterfixit

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Joined
Feb 9, 2013
Messages
199
Location
Kaufman Texas
60 amp breaker and #6 wire. The 60 amp breaker in the unit sees both the heat and blower loads.

They already figured it all in by putting a 60 amp breaker in it
That makes sense. Just making sure. What size ground do I need to pull with it?
 
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