A York (Johnson Controls) J-code rooftop model number starts with the nominal cooling capacity, then the product series, then the heat type and heat size. In J03ZFN08N2AAA1, J03 = 3.0 ton, ZF = the J**ZF packaged R-410A series, and N08 = 80 MBH single-stage gas heat with an aluminized steel heat exchanger, per York form 697946-JIM-C-0213. The 6-1/2 to 12-1/2 ton J**ZJ units follow the same lead-in (J10 = 10.0 ton) in form 5167530-JIM-H-0218.
What is a J-code York rooftop unit?
Form 5167530-JIM-H-0218 says that "Johnson Controls J**ZJ units are single package air conditioners with optional gas heating," built for outdoor rooftop or slab installation and non-residential use, running R-410A. The J**ZF manual (697946-JIM-C-0213) covers the smaller J03, J04, J05 and JA6 sizes. Both are listed under York Source 1 (S1) replacement parts, which is why our parts pages group them by the first five characters: J03ZF, J10ZJ, J15ZF and so on.
So the fastest way to find your parts page is simple. Take the first five characters off the nameplate model number and open that series page.
What do the first characters mean (tonnage and series)?
| Code | Meaning | Source |
|---|---|---|
| J03 / J04 / J05 / JA6 | 3.0 / 4.0 / 5.0 / 6.0 ton | 697946-JIM-C-0213 (J**ZF) |
| J06 / J07 / J08 / J10 / J12 | 6.5 / 7.5 / 8.5 / 10.0 / 12.5 ton | 5167530-JIM-H-0218 (J**ZJ) |
| ZF | J**ZF series; the manual lists Z = A/C, single package, R-410A | 697946-JIM-C-0213 |
| ZJ | Packaged A/C, R-410A, high efficiency | 5167530-JIM-H-0218 |
Note that 6.0 ton is JA6, not J06. In the ZJ manual, J06 means 6.5 ton. The 15-, 17.5-, 20- and 25-ton J-code series (J15ZF, J15ZJ, J20ZJ and others) have their own manuals; our series pages list their tonnage from York's parts data.
How do you read the heat type and heat size?
The three characters after the series code are the heat field: a heat type letter and a two-digit size. You can see this in the store model numbers, such as N08 in J03ZFN08N2AAA1 and N18 in J10ZJN18D2A1BAA1A1.
| Code | J**ZF (697946-JIM-C-0213) | J**ZJ (5167530-JIM-H-0218) |
|---|---|---|
| C00 | Cooling only, field electric heat ready | Cooling only |
| N__ | Gas, aluminized steel, single stage: N04, N06, N08, N10 = 40, 60, 80, 100 MBH | 2-stage gas, aluminized steel |
| D__ | Gas, aluminized steel, two stage: D06, D10 = 60, 100 MBH | — |
| S__ | Gas, stainless steel, single stage: S04, S06, S08, S10 | 2-stage gas, stainless steel |
| T__ | Gas, stainless steel, two stage: T06, T10 | — |
| E__ | Electric heat: E05, E07, E10, E15, E20, E30 = 5 to 30 kW | Electric heat: 18, 24, 36, 54 kW |
On the ZJ, the gas sizes listed in form 5167530-JIM-H-0218 are 12 (J06 to J08), 18 (J06 to J12) and 24 (J10 and J12), meaning 120, 180 and 240 MBH input. Electric sizes are 18, 24 and 36 kW (J06 to J12) and 54 kW (J10 and J12). Our J10ZJ page also carries models with codes such as N15 and N20, and our J03ZF page carries H05 and N11. Those codes are not in the manual revisions we read, so check them against the manual that shipped with your unit.
What do the rest of the characters mean on a J03ZF?
Take J03ZFN08N2AAA1 from our J03ZF page. The first eight characters read J03 (3.0 ton), ZF (series) and N08 (80 MBH single-stage gas, aluminized steel). The characters after the heat field carry the airflow, voltage, installation option, option and product generation codes that form 697946-JIM-C-0213 lists.
The web copies of that manual do not show the printed field order cleanly, so we do not assign those characters by position here. Use the code lists below with the nomenclature figure in the manual for your unit.
| Field (697946-JIM-C-0213) | Codes listed |
|---|---|
| Airflow | Belt drive codes N, P, R, T, U, V; direct drive codes A, B, D. The letters also mark economizer, motorized damper and high-static versions. |
| Voltage | 1 = 208/230-1-60, 2 = 208/230-3-60, 4 = 460-3-60, 5 = 575-3-60 |
| Installation options | A = no options installed; B through Z = combinations of disconnect, non-powered convenience outlet, supply and return smoke detectors and powered convenience outlet |
| Options | AA = none; AB = phase monitor; AC = coil guard; AD = dirty filter switch; AE through AH = combinations; ZZ = combination not listed |
| Product generation | 2 = Second Generation |
When the options code is ZZ, form 697946-JIM-C-0213 says the configuration options are in digits 15 to 18. That matches the 18-character J03ZF numbers on our page that contain ZZ, for example J03ZFN08A1AZZ10001.
How do you read a J10ZJ model number?
Most J10ZJ models on our page are 18 characters, for example J10ZJN18D2A1BAA1A1. The first eight characters read J10 (10.0 ton), ZJ (packaged A/C, R-410A, high efficiency) and N18 (2-stage gas, aluminized steel, 180 MBH input), per form 5167530-JIM-H-0218.
The rest of the string carries option codes. As with the ZF, the web copies do not show the printed order cleanly, so read these against the nomenclature figure in your manual rather than by position:
| Field (5167530-JIM-H-0218) | Codes listed |
|---|---|
| Blower option | B = standard static, D = high static; E through X = VFD/VAV and VFD IntelliSpeed versions |
| Voltage | 2 = 208/230-3-60, 4 = 460-3-60, 5 = 575-3-60 |
| Outdoor air option | A = no economizer, B = economizer with barometric relief, D = economizer with power exhaust, H = motorized damper |
| Service options | 1 = none, 2 = disconnect switch, 3 through 6 = convenience outlet and disconnect combinations |
| Controls option | A = stand-alone Smart Equipment; other letters for communication cards and other controls |
| Sensors, refrigeration, filters, cabinet | Letter or digit codes for phase monitor, dirty filter switch and smoke detectors; coated coils and hot gas bypass; filter grades and coil guard; drain pan options |
| Product generation | 1 = first generation |
About 8% of J10ZJ models on our page (78 of 1,001) use a shorter 14-character style, such as J10ZJC00A2AAA5. That style is not covered by the manual revision we read, but it still starts with the same tonnage, series and heat characters.
Parts involved
| Component | Role | Where to find it |
|---|---|---|
| Unit control board, J03ZF | Listed for many J03ZF models on our series page. Match by part number. | York S1-03102993000 Simplicity Lite Control Board, Gas/Electric, 4S | OEM Source 1 Part |
| Unit control board, J10ZJ | Listed for some J10ZJ and J07ZJ models. The 18-character ZJ models use a Smart Equipment control per the manual. | York S1-6421651 SSE Control Board, 2-Stage, Non-Communicating | OEM Source 1 Part |
| Gas valve, 15–20 ton | Listed for gas-heat J15ZF, J15ZJ and J20ZJ models. | York S1-02527720700 Gas Valve, Natural Gas, 24V, 3/4 x 1/2 in., White-Rodgers 36H32-466 | OEM Source 1 Part |
| Liquid line filter-drier | Listed for J03ZF and J10ZJ models. | York S1-6109460 Filter-Drier, Liquid, 3/8 ODF, DCL 053S | OEM Source 1 Part |
Which York units this applies to
- York J03ZF parts — 3-ton J**ZF rooftop, the primary example here.
- York J07ZJ parts — 7.5-ton J**ZJ rooftop.
- York J10ZJ parts — 10-ton J**ZJ rooftop.
- York J15ZF parts — 15-ton ZF rooftop (separate manual).
- York J15ZJ parts — 15-ton ZJ rooftop (separate manual).
- York J20ZJ parts — 20-ton ZJ rooftop (separate manual).
For what the S1- prefix on the part numbers means, see York S1 (Source 1) part number meaning.
Scope: Code lists come from York/Johnson Controls form 697946-JIM-C-0213 (J**ZF, J03 to JA6, 3 to 6 ton, R-410A) and form 5167530-JIM-H-0218 (J**ZJ with Smart Equipment, J06 to J12, 6-1/2 to 12-1/2 ton, R-410A). Example model numbers are taken from our J03ZF and J10ZJ series pages. Other revisions and the 15-ton-and-up J-code series use their own legends.
Before you order
Copy the full model and serial number from the unit nameplate, plus the part number on the failed part. Two units with the same first five characters can take different parts depending on heat type, voltage and options. To confirm fit, contact us at help@totalhvacparts.com or 610-487-7999 with the model, serial and part number.
Frequently Asked Questions
What does J03 mean in a York J03ZF model number?
J03 is the nominal cooling capacity: 3.0 ton. Form 697946-JIM-C-0213 lists J03, J04, J05 and JA6 for 3.0, 4.0, 5.0 and 6.0 ton J**ZF units.
Is J06ZJ a 6-ton unit?
No. In form 5167530-JIM-H-0218, J06 means 6.5 ton for the J**ZJ series. The 6.0-ton J**ZF size is coded JA6.
What does C00 mean in a York J-code model number?
C00 means cooling only. The J**ZF manual adds that the unit is field electric heat ready.
What does N18 mean on a York J10ZJ?
Per form 5167530-JIM-H-0218, N is 2-stage gas heat with an aluminized steel heat exchanger and 18 is 180 MBH input. S in the same spot means a stainless steel heat exchanger.
Why do some York J-code model numbers have 18 characters?
On J**ZF units, an options code of ZZ means a custom configuration spelled out in digits 15 to 18. The J**ZJ manual revision we read also uses a longer option string covering service options, sensors, controls, refrigeration, filters and cabinet.
Sources
- Johnson Controls/York form 697946-JIM-C-0213, Installation Manual, J**ZF Series 5 single package R-410A rooftop units, J03 to JA6 (nomenclature)
- Johnson Controls/York form 5167530-JIM-H-0218, Installation Manual, J**ZJ Series with Smart Equipment, 6-1/2 to 12-1/2 ton, 60 Hz, R-410A (general description, nomenclature page 4)
- Model numbers and series groupings from our York S1 series pages, sourced from York's parts data
- Live product titles for the parts listed above, as shown on each product page
Rooftop units involve line voltage, gas, refrigerant under pressure and rotating parts. Service should be performed only by qualified personnel, following the manual for your unit and your facility's lockout/tagout procedures.