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Carrier 3 ton air handler question

Nashville Cat

Nashville Cat

Veteran Member
Senior Member
My attic air handler - Carrier FB4C 2.5 ton , which has no electric emergency heat, is wired with 6/2 NM-B cable with a 60 amp breaker ?
This seems like way overkill ? Shouldn't this be a 30 amp breaker ?
Was this installed with the thought of adding electric heat later ?

My outside 2.5 ton heat pump condenser has #10 wire and a 30 amp breaker.

I am going to connect the air handler to the solar system and wonder if I need to use such large wiring ?

Air handler data plate
1687311977478.jpeg
 
Nashville Cat said:
My attic air handler, which has no electric emergency heat, is wired with 6/2 NM-B cable with a 60 amp breaker ?
This seems like way overkill ? Shouldn't this be a 30 amp breaker ?
Was this installed with the thought of adding electric heat later ?

My outside 2.5 ton heat pump condenser has #10 wire and a 30 amp breaker.

I am going to connect the air handler to the solar system and wonder if I need to use such large wiring ?
Click to expand...
Look at the label on the front panel of the air handler it will show what breaker size needed for No Aux heat kit and also what’s needed for 5-7or8-10 KW it probably only needs 15 amp 230 volt, Edit if the AH is hard to get to for reading the label if you know model number you can Google specs 🙂
 
Shovelrick said:
Look at the label on the front panel of the air handler it will show what breaker size needed for No Aux heat kit and also what’s needed for 5-7or8-10 KW it probably only needs 15 amp 230 volt, Edit if the AH is hard to get to for reading the label if you know model number you can Google specs 🙂
Click to expand...
Also if there’s ever a blower motor failure the 60 amp breaker won’t trip, fire hazard PS I’ve never understood why package units require a separate circuit breaker & wire for the heater kit when they’re outside a home but an indoor air handler only needs the wire and breaker sized to the heat kit
 
Nashville Cat said:
My attic air handler - Carrier FB4C 2.5 ton , which has no electric emergency heat, is wired with 6/2 NM-B cable with a 60 amp breaker ?
This seems like way overkill ? Shouldn't this be a 30 amp breaker ?
Was this installed with the thought of adding electric heat later ?

My outside 2.5 ton heat pump condenser has #10 wire and a 30 amp breaker.

I am going to connect the air handler to the solar system and wonder if I need to use such large wiring ?

Air handler data plate
View attachment 12591
Click to expand...
Yep 15 amp max 🙂 Edit Beth I’d get a 10 KW heat kit for defrost mode under 34 outside temp and back up if heat pump breaks
 
I found this at the very end of the performance data brochure :

1687313607201.png
Mine is the FB4CNF030 , 3rd from top
You nailed it ! A 15 amp breaker is all this needs. That saves me at least $100 in wiring and will stop a fire hazard. THANKS ! (y) 👋 :love:
 
In the mid 80’s I spoke up to an electrical inspector on a large room addition Rough In, he was telling me I was getting Red Tagged for not having a 3 wire plus ground (10/3) to a standard Water Heater, I did tell him it wasn’t needed since it had No 110 volt controls or a Light Bulb 😁 He was Wrong 😁 a newer clothes dryer that’s 230 volts does need a Neutral for interior light and possibly any 120 volt controls and any room addition or new build has to have 10/3 W grnd wire and 4 prong outlet rated 30 amp Edit for Clothes Dryer
 
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