What replaced the Carrier 24ABB3?
Checked against 24ABB3 Comfort 13 Air Conditioner with Puron Refrigerant — Product Data, September 2026.
The 24ABB3 is an R-410A air conditioner — Carrier's Three-phase Comfort tier, single-stage. R-410A equipment stopped being manufactured after 31 December 2024, so there is no new one of these to buy — but that does not mean your only option is a whole new system.
The model Carrier points you at
Is this your unit? 24ABB3 is a family. The data
plate carries one of these numbers: 24ABB318ABN3 , 24ABB324ABN3 , 24ABB330ABN3 , 24ABB336ABN3 , 24ABB342A0N3 , 24ABB348ABN3 , 24ABB360A0N3 , 24ABB318A0L3 , 24ABB324A0L3 , 24ABB330A0L3 , 24ABB336A0L3 , 24ABB342A0L3 , 24ABB348A0L3 , 24ABB360A0L3 , 24ABB330A005 , 24ABB336A001 , 24ABB336A005 , 24ABB336A006 , 24ABB342A005 , 24ABB342A006 , 24ABB348A001 , 24ABB348A005 , 24ABB348A006 , 24ABB360A001 , 24ABB360A005 , 24ABB360A006 .
The copper you already have
What the 24ABB3 was installed with, size by size. The last two columns are what the 26SCA4 needs at the same capacity, so you can see before the quote arrives whether your line set carries over.
| Model | Capacity | Liquid line OD | Suction line OD | 26SCA4 liquid | 26SCA4 suction |
|---|---|---|---|---|---|
24ABB318 | 1.5 ton | 3/8" | 3/4" | 3/8" (same) | 5/8" (smaller) |
24ABB324 | 2 ton | 3/8" | 3/4" | 3/8" (same) | 3/4" (same) |
24ABB330 | 2.5 ton | 3/8" | 3/4" | 3/8" (same) | 3/4" (same) |
24ABB336 | 3 ton | 3/8" | 7/8" | 3/8" (same) | 7/8" (same) |
24ABB342 | 3.5 ton | 3/8" | 7/8" | 3/8" (same) | 7/8" (same) |
24ABB348 | 4 ton | 3/8" | 7/8" | 3/8" (same) | 7/8" (same) |
24ABB360 | 5 ton | 3/8" | 1-1/8" | 3/8" (same) | 1-1/8" (same) |
Whether your indoor coil, your copper and your furnace can stay is a Carrier rule rather than a rule about this model: the Carrier rules page states all three, with the documents behind them.
A like-for-like R-410A outdoor unit, labelled "For Service Only", is still a legal option in most states and keeps your existing coil — the phase-out guide sets out when that route closes .
How Carrier listed the 24ABB3
| Refrigerant | R-410A |
|---|---|
| Tier | Three-phase Comfort |
| Compressor | single-stage |
| Region | All regions |
| Coastal option | Not listed |
What the documents say about this model
ManufacturerOn the single-phase units Carrier gives 3/8 inch as the maximum liquid line at every capacity — a ceiling rather than a rating, unlike the other sheets in this family of documents. The vapour line is 3/4 inch at 1.5, 2 and 2.5 tons, 7/8 inch at 3, 3.5 and 4 tons, and 1-1/8 inch at 5 tons, and the copper and aluminium coil models take the same diameters.
ManufacturerAt 5 tons the three-phase units take a 7/8 inch vapour line where the single-phase unit of the same capacity takes 1-1/8 inch. Same family, same tonnage, different copper — so the phase on the data plate has to be read before the line size is looked up.
ManufacturerCarrier's own product data lists this family in single phase and in three phase, with seven single-phase capacities from 1.5 to 5 tons. The distributor transition guide presents the 24ABB3 as the three-phase row, which is where the "three-phase Comfort" name on this page comes from; a homeowner with a single-phase 24ABB3 has one of the models on that sheet, not a different family.
Where the mapping comes from
DistributorCarrier Enterprise's 2025 equipment transition guide lists the 24ABB3 as an R-410A Three-phase Comfort-tier air conditioner: a single-stage unit, sold for all regions. No coastal option is listed. The guide's Puron Advance column for this row is 26SCA4.
Read next
- Check your own swap against the 26SCA4 Your coil and your line diameters, against what Carrier publishes for the unit you are being quoted.
- The Carrier rules, with sources All three answers for the range, and every document behind them.
This is a starting point, not an approval. Everything here is read from published manufacturer documents and dated, but only the licensed contractor who signs your installation can approve a specific system for your home and your local code. Take the citations on this page to them and ask.