Call an HVAC service man.
carrier
What is the tonnage of a carrier ac unit 24ABB360A0032010
Central Processing Units do not have "external units". There are many things outside (external to) the CPU, but nothing named an "external unit".
Central Unit ended in 2011.
Central processioning unit.
That's a 4 tonne unit
central processing unit
Central Processing Unit .
Central Processing Unit
A carrier window unit heater can often be repaired by replacing the internal fuses. More complex repairs may require the unit to be serviced by an experienced technician.
Central Processing Unit.
Central Processor Unit --> CPU