American Standard 5A7A5
Checked against Product Data — Split System Cooling 5A7A4 (Silver 14 Air Conditioner, R-454B), September 2026.
Air conditioner on R-454B, 1.5 to 5 ton. Here is what the American Standard documents say you can keep.
5A7A5 is a model family.
The data plate on your unit carries a longer number that starts with
5A7A5 — the size and revision digits follow it. This page
covers the family.
The bulletin lists these model numbers in it: 5A7A5018A1000A , 5A7A5024A1000A , 5A7A5030A1000A , 5A7A5030A1000B , 5A7A5036A1000A , 5A7A5036A1000B , 5A7A5042A1000A , 5A7A5048A1000A , 5A7A5048A1000B , 5A7A5060A1000A , 5A7A5060A1000B .
What you can keep
Indoor coil
Has to be replacedYour existing R-410A coil cannot stay. American Standard states it directly: an R-410A evaporator coil cannot be used or converted with R-454B, and the R-454B coil has to be factory equipped with a mitigation control board.
Not checked: your own coil against this unit. That needs its model number, which is on the coil label inside the air handler or furnace cabinet.
American Standard's brand rule — see the brand page.Line set
Can stay, with conditionsSometimes — and the trap here is the opposite of the one people expect. American Standard rates its R-454B units on *smaller* copper than R-410A, so the risk is that the line you own is too big rather than too small.
- The vapor line is the rated size for your tonnage or one of the listed alternates. A line that was acceptable on R-410A may not return oil to the compressor on R-454B, and an oversized vapor line is named as a compressor reliability risk rather than a harmless margin.
- The liquid line is 5/16 inch, which every R-454B tonnage is rated on, or the approved 3/8 inch alternate. A 1/2 inch liquid line is not approved at any tonnage.
- The run is inside 150 equivalent feet, which is the maximum for a single-stage R-454B unit of this brand, and inside the vertical limit for the machine: 150 feet with an air conditioner above the indoor coil, 50 feet with a heat pump above it.
- The connection is checked separately from the size. The single-stage heat pumps have new service valve connection sizes, so copper of the right diameter can still be the wrong fitting.
Not checked: your line size. The 5A7A5 uses 5/16" liquid with 3/4" or 7/8" or 1-1/8" suction, by capacity, and you have not measured the outside diameter of both copper lines.
American Standard's brand rule — see the brand page.Furnace
Can stay, with conditionsYour furnace is not replaced, but it does not come away untouched: a new factory-supplied wire harness runs from the detection system in the coil to the furnace and has to be connected in the field.
- The new wire harness between the coil's refrigerant detection system and the furnace is connected on site — American Standard supplies it, the installer has to land it.
- Your furnace has to be one the harness can be connected to. The bulletin does not list which furnaces those are.
Check your own coil and line set →
Sizes and line diameters
From the 5A7A5 product data, size by size.
| Model | Capacity | Liquid line OD | Suction line OD |
|---|---|---|---|
5A7A5018 | 1.5 ton | 5/16" | 3/4" |
5A7A5024 | 2 ton | 5/16" | 3/4" |
5A7A5030 | 2.5 ton | 5/16" | 3/4" |
5A7A5036 | 3 ton | 5/16" | 7/8" |
5A7A5042 | 3.5 ton | 5/16" | 7/8" |
5A7A5048 | 4 ton | 5/16" | 7/8" |
5A7A5060 | 5 ton | 5/16" | 1-1/8" |
How American Standard lists this unit
| Tier | Silver 14 Air Conditioner |
|---|---|
| Compressor | — |
What the documents say about this model
ManufacturerThe family's product data sheet gives a rated line size for each of the seven capacities. The liquid line is 5/16 inch at every size. The vapor 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. Every size in the family runs on single-phase 208/230 volt power.
ManufacturerThe sheet prints the service valve connection and the rated line size as two separate rows, and on two of the seven sizes they are different numbers. The 3 ton carries a 3/4 inch gas valve and is rated for a 7/8 inch line; the 5 ton carries a 7/8 inch gas valve and is rated for a 1-1/8 inch line. On the other five sizes the two agree. Sizing a line set by measuring the fitting on the new condenser is therefore wrong on exactly the two sizes where it matters most.
ManufacturerThis sheet states no maximum line length and no vertical lift for the family. Its footnote against the line size row sends the installer to the outdoor unit's ship-with literature and to a separate refrigerant piping application guide instead. The length limit that applies to this unit is the brand's, not the family's, and it is cited on the brand rules page.
ManufacturerAmerican Standard sells a second Silver 14 air conditioner, the 5A7A4, and its product data sheet is this one under another model name for most of the range. Compressor, coil, factory charge to the ounce, charging subcooling, crated dimensions, minimum circuit ampacity and almost every accessory part number are identical at all seven capacities. The two families genuinely part company at the top: the 5A7A5's 5 ton carries a 1/3 horsepower condenser fan drawing 2.80 amps and is rated for a 1-1/8 inch vapor line, where the 5A7A4's 5 ton has a 1/5 horsepower fan at 0.93 amps and is rated for 7/8 inch. Below 5 tons there is nothing in either sheet to choose between them on the copper.
ManufacturerThe unit ships charged for itself, ten feet of connecting line and the smallest rated indoor coil it can be matched with. Any longer run, or any larger coil, is charge the installer has to add on site. A reused line set is almost always longer than ten feet, so this is a step in the job rather than an upgrade to argue about. The factory charge runs from 3 lbs 8 oz to 6 lbs 10 oz across the family, and it does not rise with capacity: the 4 ton carries the most of any size in the family, more than the 5 ton above it. The sheet also records the unit as certified to UL 60335-2-40, the appliance standard written for flammable-refrigerant equipment.
The rest of the answer above is American Standard's brand-wide rule — 11 cited statements, written out in full on the American Standard rules page.
Approved and certified combinations
We have not yet read a published match list for this unit. Ask your installer for the AHRI certified reference number of the combination they are quoting — every certified pair has one.
What this unit replaces
The 5A7A5 is the R-454B successor to 4A7A5. If that is what is on the pad today, this is the unit being quoted to you.
What to ask your installer about the 5A7A5
- The 5A7A5 takes 5/16" liquid with 3/4" or 7/8" or 1-1/8" suction, by capacity. Which capacity are you quoting me, and does my existing copper match the diameters for it?
The questions to ask about any American Standard swap are on the American Standard rules page.
Questions people ask about this unit
What line size does the 5A7A5 need?
The liquid line is 5/16 inch at every capacity. The vapor 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. The table on this page is read from American Standard's product data sheet for this family — and at 3 tons that sheet does not agree with the brand's own Application Guide, which is set out below.
Does the service valve on a 5A7A5 tell me my line size?
Not on every size in this family. On the 3 ton 5A7A5036 the gas service valve is 3/4 inch and the rated line is 7/8 inch; on the 5 ton 5A7A5060 the valve is 7/8 inch and the rated line is 1-1/8 inch. On the other five sizes the two match. Measuring the fitting on the new condenser gives the wrong number on exactly those two.
How much refrigerant does a 5A7A5 come with?
Enough for the condenser itself, ten feet of connecting line and the smallest indoor coil it is rated to match. A reused line set is nearly always longer than ten feet, so charge has to be added on site. The per-size factory charge is printed on this family's product data sheet and runs from 3 lbs 8 oz to 6 lbs 10 oz.
Other American Standard air conditioners
| Model | Tier | Compressor | Replaces |
|---|---|---|---|
| 5A7A3 | Silver 13 Air Conditioner | — | 4A7A3 |
| 5A7A4 | Silver 14 Air Conditioner | — | 4A7A4 |
Read next
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.