Samsung mini split line set sizes
Short answer: Samsung mini split line set size depends on capacity, not series — the sizes have stayed consistent across generations. 9,000 and 12,000 BTU wall-mounts use 1/4" × 3/8", 18,000 BTU steps to 1/4" × 1/2", 24,000 BTU uses an unusual 1/4" × 5/8", and 36,000 BTU units run 3/8" × 5/8". All connections are flared, and — unlike many value brands — the line set is not in the box. Sizes here come from Samsung's own submittal sheets; confirm yours before buying.
Samsung's mini-split lineup spans nearly a decade of generations — Smart Whisper, WindFree 2.0 through 3.0, and the new R-32 series — but the line set sizes barely move, so the table below covers all of them, pulled from Samsung's submittal sheets. Prefer to size by run length too? Use the size calculator.
Samsung line set size by capacity
Unlike brands where the series changes the pipe sizes, Samsung's sizing is a straight function of capacity — a 12k WindFree 3.0 and a 12k R-32 WindFree Premium take the same copper. That makes the buying decision simple once you know your BTU rating.
| Samsung system size | Line set (liquid × suction) |
|---|---|
| 9,000 BTU | 1/4" × 3/8" |
| 12,000 BTU | 1/4" × 3/8" |
| 18,000 BTU | 1/4" × 1/2" |
| 24,000 BTU | 1/4" × 5/8" |
| 36,000 BTU | 3/8" × 5/8" |
Found your size? Get the matching line set
Samsung doesn't put a line set in the box, so you'll need one either way. We stock three of the four Samsung sizes: 1/4" × 3/8" for 9k–12k units, 1/4" × 1/2" for 18k, and 3/8" × 5/8" for 36k — in 16 ft and 25 ft, open for preorder. The 25 ft length is a natural fit here, since Samsung's factory charge covers exactly 25 ft of line.
The 24k's odd pair — and no line set in the box
Two things trip people up on Samsung. First, the 24,000 BTU units use 1/4" × 5/8" — most brands have stepped the liquid line up to 3/8" by that capacity, so a generic 24k line set off the shelf is likely the wrong size for a Samsung. Second, Samsung does not include a line set with the unit. Samsung sells optional ILS kits (the ILS2506 is a 25 ft 1/4" × 3/8" set, for example), but plenty of Samsung condensers arrive on site with no copper at all — budget for the line set as a separate purchase.
Samsung line set size by series and model number
Samsung indoor wall-mount model numbers follow a pattern: AR + capacity + generation letter + series code. AR12TSFA is a 12k WindFree 2.0; AR09DXDA is a 9k R-32 WindFree Premium. The generation letter (K, T, B, C, D) is the fastest way to place your unit.
| Series | Model pattern | Years | Refrigerant | Line set sizes |
|---|---|---|---|---|
| Smart Whisper | AR##KSWSJ | ~2016–19 | R-410A | 18k = 1/4" × 1/2" (verified); other capacities not verified from submittals |
| WindFree 2.0 / Max Heat 2.0 | AR##TSFA | 2020 | R-410A | 9k/12k 1/4" × 3/8" · 18k 1/4" × 1/2" · 24k 1/4" × 5/8" |
| WindFree 2.0e | AR##BSFC | 2021–22 | R-410A | 9k 1/4" × 3/8" (verified) |
| WindFree 3.0 / 3.0e / Max Heat 3.0 | AR##CSDA / AR##CSFC | 2023 | R-410A | Same pattern, 9k–24k |
| Max 36K | AR36BSHUMGM | — | R-410A | 3/8" × 5/8" |
| WindFree Premium / Standard / Max Heat R-32 | AR##DXDA / AR##DXFA | 2024+ | R-32 | Same pattern, 9k–24k |
| 36K R-32 | AR36DXFUMGM | 2024+ | R-32 | 3/8" × 5/8" |
Flared, not quick-connect — and bring your own copper
Every Samsung wall-mount uses standard field-flared connections, not pre-charged quick-connect. The difference from brands like Della or Senville is what's in the box: nothing, as far as copper goes. Samsung's answer is the optional ILS line set kit line — the ILS2506, for instance, is 25 ft of 1/4" × 3/8" — or you buy a flared line set from anyone, since flare fittings are standard. Either way the install is a real flare job: cut, flare, torque, then pull a vacuum before opening the service valves, which needs a vacuum pump and typically EPA 608 certification. See our standard line sets, or pre-charged line sets if you want the no-vacuum route on a compatible system — though that's not Samsung.
Samsung line set length limits
Samsung's limits are generous compared to the value brands — a 12k Samsung allows 66 ft where a Della 12k caps at 49 — and Samsung also publishes a minimum line length, which many brands don't.
| Capacity | Min length | Max line length | Max vertical separation | Pre-charged for |
|---|---|---|---|---|
| 9,000–12,000 BTU | 9.8 ft (3 m) | 66 ft (20 m) | 49 ft (15 m) | 25 ft |
| 15,000–24,000 BTU | 9.8 ft (3 m) | 98 ft (30 m) | 66 ft (20 m) | 25 ft |
| 36,000 BTU | Not published | 246 ft (75 m) | 98 ft (30 m) | 25 ft |
The factory charge covers the first 25 ft of line on every model. Beyond that, Samsung's R-410A submittals call for 0.16 oz of refrigerant per extra foot on the 9k–24k sizes and 0.11 oz per foot on the 36k — a gauges-and-scale job for an HVAC pro. Samsung hasn't published the adder for the R-32 models, so on those, the installing tech should pull the figure from the unit's own installation manual. The 9.8 ft minimum matters too: mounting the condenser directly behind the indoor unit's wall can leave you shorter than Samsung allows, so plan to coil or route the difference.
Refrigerant: R-410A through 2023, R-32 from 2024
Samsung ran R-410A across every generation through 2023 — Smart Whisper, WindFree 2.0, 2.0e, and 3.0 — then switched the 2024-and-later D-generation (WindFree Premium, Standard, and Max Heat R-32) to R-32. Note the direction of that switch: Samsung chose R-32, not R-454B, so if your gauges and recovery setup are R-454B-only you're not ready for a new Samsung. The fastest field check is the outdoor unit's model code: RNS or RXS means R-410A, RNX or RXX means R-32. The copper line set is identical either way — same sizes, same flares — but your tools and any added charge are not. Check the nameplate before you charge anything.
How to find your Samsung model's line set size
- Read the indoor model number. Samsung wall-mounts follow AR + capacity + generation letter + series code — AR18TSFA breaks down as 18k, T-generation (WindFree 2.0, 2020, R-410A). The letter after the capacity places the generation: K = Smart Whisper, T = WindFree 2.0, B = WindFree 2.0e, C = WindFree 3.0, D = the 2024+ R-32 series.
- Check the outdoor unit code for refrigerant. RNS/RXS outdoor units are R-410A; RNX/RXX are R-32.
- Confirm on the submittal sheet. Samsung's submittals list the exact liquid and suction diameters, the length limits, and the refrigerant for your pairing — the final word before you buy copper.
Common questions
What size line set does a Samsung 12,000 BTU mini-split use?
A Samsung 12,000 BTU wall-mount uses a 1/4" liquid line with a 3/8" suction line, and the 9,000 BTU models use the same pair. That holds across generations — WindFree 2.0, 2.0e, 3.0, and the current R-32 series all list 1/4" × 3/8" on their submittal sheets. Confirm against your model's sheet before buying copper.
What size line set does a Samsung 24,000 BTU mini-split use?
Samsung's 24,000 BTU wall-mounts use a 1/4" liquid line with a 5/8" suction line — an unusual pairing. Most brands step the liquid line up to 3/8" by 24k, so a generic 3/8" × 5/8" line set won't fit a Samsung 24k without an adapter. Verify the 1/4" × 5/8" pair on your unit's submittal sheet.
Do Samsung mini-splits use quick-connect or flared line sets?
Samsung uses standard field-flared connections, not pre-charged quick-connect — and unlike many value brands, Samsung does not include a line set in the box. Samsung sells optional ILS line set kits (such as the 25 ft ILS2506), or you source a flared line set separately. Either way you flare the copper and pull a vacuum before opening the service valves, which needs a vacuum pump and typically EPA 608 certification.
What refrigerant do Samsung mini-splits use?
Samsung generations through 2023 — Smart Whisper, WindFree 2.0, 2.0e, and 3.0 — run R-410A. The 2024-and-later D-generation (WindFree Premium, Standard, and Max Heat R-32) switched to R-32; Samsung chose R-32 rather than R-454B for the transition. A quick check: outdoor units coded RNS or RXS are R-410A, while RNX or RXX are R-32. The copper line set is the same either way, but your gauges and any added charge are not.
What is the maximum line set length for a Samsung mini-split?
It scales with capacity: 9,000–12,000 BTU units allow up to 66 ft of line and 49 ft of vertical separation, 15,000–24,000 BTU units allow 98 ft and 66 ft, and the 36,000 BTU units allow 246 ft of line with 98 ft of vertical separation. Samsung also publishes a minimum of 9.8 ft on the 9k–24k sizes. Confirm your unit's limits on its submittal sheet.
How do I tell which Samsung series I have from the model number?
Samsung indoor wall-mount model numbers read AR + capacity + a generation letter + a series code — so AR12TSFA is a 12k WindFree 2.0. The generation letter is the key: K is Smart Whisper (~2016–19), T is WindFree 2.0 / Max Heat 2.0 (2020), B is WindFree 2.0e (2021–22), C is WindFree 3.0 / 3.0e / Max Heat 3.0 (2023), and D is the 2024+ R-32 series. Match that against the sizing table, then confirm on the submittal sheet.
Line set sizes for other brands: LG · Mitsubishi · Daikin · Fujitsu · Gree
This page provides general guidance on Samsung mini-split line set sizing based on Samsung's published submittal sheets (Smart Whisper, WindFree 2.0/2.0e/3.0, Max Heat, and the 2024+ R-32 series). Exact diameters, length limits, and refrigerant (R-410A or R-32 on 2024+ models) vary by model — always verify against your unit's official submittal sheet or installation manual before purchasing or installing.