On a York YCIV or YCAV air-cooled screw chiller, the style is PIN 14 of the 15-character model number. York calls it the "Design Series" in forms 201.23-NM2 (YCIV) and 201.21-NM1 (YCAV). On a YCAS Style G the 14th character is also the style letter: G, per form 201.19-NM1. On a YVAA covered by form 201.28-NM1.1, the 4th character is the design series, the 14th is the "Development Level" and the 15th is the refrigerant (A = R-134a, B = R-513A).
How do you read a York YCIV or YCAV model number?
Both manuals use the same Product Identification Number (PIN) layout for the first 15 characters. The table follows the PIN tables in the 12/2023 (1223) issues of both forms.
| PIN | Field | Codes (201.23-NM2 YCIV / 201.21-NM1 YCAV) |
|---|---|---|
| 1-4 | Model | YCIV or YCAV |
| 5-8 | Nominal capacity | YCIV: 0157 to 0397. YCAV: 0157 to 0267 (60 Hz), plus 0569 to 0969 listed in the YCAV table. |
| 9 | Unit designator | S = standard efficiency, standard IPLV. P = standard efficiency, optimized IPLV. E = high efficiency/high ambient, standard IPLV. V = high efficiency/high ambient, optimized IPLV. YCIV also lists H = standard efficiency, optimized IPLV (ARI only). |
| 10 | Refrigerant | A = R-134a. The 07/2026 issue of 201.23-NM2 adds H = R-513A for the YCIV. |
| 11-12 | Voltage | 17 = 200/3/60, 28 = 230/3/60, 40 = 380/3/60, 46 = 460/3/60, 50 = 380-415/3/50, 58 = 575/3/60 |
| 13 | Starter | V = variable speed drive |
| 14 | Design series (style) | YCAV: A. YCIV: A or K. |
| 15 | Modification level (called "Development Code" in the 07/2026 YCIV issue) | YCAV: A. YCIV: B. |
York's nomenclature example in the 07/2026 issue of 201.23-NM2 is YCIV-0187-S-A-46-V-A-A: a 0187 YCIV, standard efficiency with standard IPLV, R-134a, 460/3/60, VSD starter, design series A, then the development code. Note the A at PIN 10. It is the refrigerant, not the style. The style is the second-to-last character.
The full YCIV and YCAV PIN keeps going past 15. The later positions code options such as the power field, control transformer, design working pressure, coils and fan motors. You don't need them to find the style.
How do you read a York YCAS Style G model number?
Form 201.19-NM1 (YCAS0130 to YCAS0230, Style G, 60 Hz) labels the groups "BASE PRODUCT / TYPE / NOMINAL CAPACITY / UNIT DESIGNATOR / REFRIGERANT / VOLTAGE/STARTER / DESIGN/DEVELOPMENT LEVEL (STYLE)". Its example is YCAS0230EC46YGA:
| Characters | Example | Field |
|---|---|---|
| 1-4 | YCAS | Base product and type |
| 5-8 | 0230 | Nominal capacity |
| 9 | E | Unit designator |
| 10 | C | Refrigerant (the manual covers R-22 and R-407C) |
| 11-13 | 46Y | Voltage and starter (Wye-Delta or across-the-line) |
| 14 | G | Design series G (the style) |
| 15 | A | Development level ("Engineering Change or PIN Level") |
The YCAS uses a Wye-Delta or across-the-line starter, not a VSD. That's an easy way to tell it from a YCAV of the same size.
How do you read a York YVAA model number?
Form 201.28-NM1.1 (YVAA Style A, frames 015 to 052, 150 to 500 tons) uses a different layout. York's example in the 12/22/2025 issue is YVAA 074 WXYZ 46 A A:
| Group | Example | Meaning per 201.28-NM1.1 |
|---|---|---|
| Base product type (1-4) | YVAA | Y = YORK, V = Variable Speed Screw, A = Air Cooled Chiller, A = Design Series |
| Frame size (5-7) | 074 | Chiller frame |
| Selected configuration, unit designator (8-11) | WXYZ | W = condenser code, X = evaporator code, Y = compressor code, Z = condenser fan & sound kit code |
| Voltage (12-13) | 46 | 17 = 200/3/60, 28 = 230/3/60, 40 = 380/3/60, 46 = 460/3/60, 50 = 400/3/50, 58 = 575/3/60 |
| 14th character | A | Development level ("Engineering Change or PIN") |
| 15th character | A | "Level / Refrigerant": A = R-134a, B = R-513A |
On a YVAA the last letter is the refrigerant, so a unit ending in BA is development level B on R-134a, not an R-513A unit. YVAA manuals issued later, such as form 201.47-ICOM1 (2022), use a newer nomenclature with separate design style, fan quantity and modification level fields. If your nameplate doesn't fit the table above, read it against that manual or send it to us.
Why does the style letter matter for parts?
York publishes manuals and parts lists by style. For example, the 201.28-NM1.1 associated literature table lists renewal parts form 201.28-RP2 for YVAA Style A frames 015 to 052 built after April 2012 and before September 2014, and 201.28-RP3 for YVAA Style B built after September 2014. Our model pages are split the same way, for example YVAA Style A and YVAA Style B, or YCAS Style F and YCAS Style G. The two styles don't list the same parts. For example, our YVAA Style B page lists oil filter 026-35601-000 and O-ring 028-13849-000, and our Style A page does not. Read the style from the nameplate first, then open the matching page. For decoding the part numbers themselves, see How to Look Up a York Part Number.
Parts involved
| Component | Role | Where to find it |
|---|---|---|
| Oil filter element | Listed on the YVAA Style B page but not the Style A page. This is one place where style decides the part list. | York 026-35601-000 Oil Filter Element | OEM Chiller Part |
| 900 mm fan blade | Listed across the YCIV, YCAV, YVAA, QTC4 and YCAS Style G pages. | York 026-41594-000 Fan, Impeller (900MM) | OEM Chiller Part |
| Filter drier | Listed on the YVAA Style A and B and QTC4 pages. | York 026-37563-000 Filter Drier, 3/8" ORFS | OEM Chiller Part |
| Parts by family | Browse by product line. | York YVAA Air-Cooled Screw Chiller Parts, York YCIV Air-Cooled Screw Chiller Parts, York YCAV Air-Cooled Screw Chiller Parts |
Which York units this applies to
- YVAA Style B: units built after September 2014, per the 201.28-NM1.1 associated literature. Confirm the layout against your manual.
- YVAA Style A: nomenclature per 201.28-NM1.1.
- YCIV Style A: PIN 14 = design series per 201.23-NM2.
- YCAV Style A: PIN 14 = design series per 201.21-NM1.
- YCAS Style G: 14th character = G per 201.19-NM1.
- YVFA Style A: free-cooling VSD screw chiller. Read its style from its own manual.
Scope: York forms 201.23-NM2 (YCIV0157 to YCIV0397 Style A, 60 Hz), 201.21-NM1 (YCAV0157 to YCAV0267 Style A, 60 Hz), 201.19-NM1 (YCAS0130 to YCAS0230 Style G, 60 Hz) and 201.28-NM1.1 (YVAA Style A). The YVFA, 50 Hz versions and newer YVAA manuals have their own nomenclature pages.
Before you order
Copy the full model number and the serial number from the chiller nameplate, every character. Then contact us at help@totalhvacparts.com or 610-487-7999 and we'll match it to the right style page and part numbers.
Frequently Asked Questions
Where is the style letter in a York YCIV model number?
It is PIN 14, which form 201.23-NM2 calls the design series. In York's example YCIV-0187-S-A-46-V-A-A, it is the second-to-last A, right after the V for the VSD starter.
What does the A after the capacity mean in a York YCAV model number?
In YCAV-0267-S-A-46-V-A-A, the A right after the S unit designator is PIN 10, the refrigerant (R-134a). The style is the A at PIN 14, per form 201.21-NM1.
How do I know if my York YVAA is R-134a or R-513A?
Per form 201.28-NM1.1, the last character of the YVAA model number is the refrigerant: A = R-134a, B = R-513A. The character before it is the development level.
What does S, P, E or V mean in a York YCIV or YCAV model number?
PIN 9 is the unit designator: S = standard efficiency, standard IPLV. P = standard efficiency, optimized IPLV. E = high efficiency/high ambient, standard IPLV. V = high efficiency/high ambient, optimized IPLV.
What style is a York YCAS0230EC46YGA?
Style G. Form 201.19-NM1 shows the 14th character as the design series, G, and the 15th as the development level.
Sources
- York form 201.23-NM2, YCIV0157 to YCIV0397 Style A (60 Hz) installation, operation and maintenance (system nomenclature and Table 1, Complete PIN number description)
- York form 201.21-NM1, YCAV0157 to YCAV0267 Style A (60 Hz) installation, operation and maintenance (Unit Nomenclature p.21, Product Identification Number p.22)
- York form 201.19-NM1 (204), YCAS0130 to YCAS0230 Style G (60 Hz) installation, operation and maintenance (Unit Nomenclature p.25)
- York form 201.28-NM1.1, YVAA Style A installation, operation and maintenance (associated literature and unit nomenclature, 12/22/2025 issue)
- York form 201.47-ICOM1 (2022), YVAA installation, operation and maintenance (newer nomenclature fields)
- Live product titles for the parts listed above, as shown on each product page
Reading the nameplate is safe, but the chiller carries line voltage and refrigerant under pressure. Service should be performed only by qualified personnel, following York's manual for your unit and your facility's lockout/tagout procedures.