Oil burner nozzle markings commonly identify rated capacity, spray angle and a manufacturer-specific pattern designation. They are a starting point for identification, not proof that two nozzles from different series or manufacturers are interchangeable.
Oil burner nozzle markings typically communicate a rated capacity, spray angle and pattern designation, but the code is meaningful only with the manufacturer’s catalog basis and the burner’s approved setup. Similar-looking codes across brands should not be assumed identical.
This article explains specification logic without endorsing a substitute. Always use the burner or appliance manufacturer’s approved component data.
Safety boundary: Burner matching, nozzle replacement, commissioning and combustion adjustment must be performed by qualified personnel using the burner or appliance manufacturer’s approved data, calibrated combustion instruments and applicable safety procedures. Shut down and isolate fuel and electrical energy before service. Do not use this article to override listed equipment requirements.
Decode each field before comparing products
Capacity is commonly rated at a stated reference pressure and test fuel. Actual flow changes with pressure and fluid properties. Spray angle describes the nominal envelope, while the pattern code describes radial distribution; neither alone defines combustion compatibility.
Engineering variables that change the decision
| Variable | Why it matters | What to record |
|---|---|---|
| Capacity code | Represents calibrated flow on a stated basis. | Printed value, units and reference pressure. |
| Spray angle | Defines nominal cone envelope. | Angle code and approved chamber fit. |
| Pattern designation | Describes distribution within the cone. | Manufacturer’s pattern definition. |
| Manufacturer and series | Control calibration and geometry details. | Merke, model, lot or traceability. |
| Physical configuration | Must fit the holder and burner head. | Tråd, length, filter and sealing features. |
| Approval source | Determines valid replacement choices. | Current appliance or burner documentation. |
Verify a marked nozzle safely
- Clean only the exterior enough to read markings without contaminating the part.
- Transcribe every field and photograph it before disposal.
- Identify the catalog definition and rating pressure for that exact manufacturer.
- Compare against the appliance’s approved nozzle table, not only the removed part.
- Confirm pump pressure and burner setup specified for the chosen line.
- Have a qualified technician install and instrument-test the burner.
Common failure modes and diagnostic checks
| Observed condition | Likely checks |
|---|---|
| Capacity interpreted in wrong units | Confirm catalog units and reference conditions. |
| Angle matches but flame impinges | Mønster, insertion, burner head or chamber may be incompatible. |
| Old marking unreadable | Use equipment documentation and service records; do not guess. |
| Cross-brand substitute behaves differently | Return to approved manufacturer data and full commissioning. |
| Installed nozzle differs from equipment label | Stop and resolve the discrepancy before operation. |
Validation and release checklist
Keep the full marking, supplier part number, approved application reference and commissioning record together. The installed part and actual pump pressure must be traceable.
- Confirm materials, connections, trykk, temperature and fluid compatibility against approved product data.
- Test the complete operating system, not an isolated nozzle, under representative demand.
- Record pressure, strømme, pattern, orientation and acceptance limits for maintenance comparison.
- Revalidate after cleaning, replacement or a process change.
Information to send with an RFQ
Provide burner and appliance manufacturer and model, approved nozzle capacity code, spray angle and pattern, fuel type and approved viscosity range, pump pressure specified by the manufacturer, chamber geometry, duty, forbindelse, filtration and the qualified technician’s combustion-test requirements. Do not substitute a nozzle from nominal capacity alone.
Ofte stilte spørsmål
What do capacity, angle and pattern mean together?
They describe rated delivery and nominal spray geometry, not a complete burner approval.
Can the old nozzle be the only selection reference?
Ingen. It may already be incorrect or undocumented.
Why does reference pressure matter?
Nozzle flow varies with pressure, so the printed capacity must be interpreted on its rating basis.
Sikkerhet: Use the burner or appliance manufacturer’s approved service data. Nozzle substitution affects combustion and must be verified by a qualified technician with appropriate instruments.
Oil burner nozzle markings checklist
| Marking field | What it may represent | Verification needed |
|---|---|---|
| Kapasitet | Rated flow at a stated reference pressure and fuel condition. | Manufacturer catalog and actual pump pressure. |
| Spray angle | Nominal included angle under defined test conditions. | Approved chamber and burner requirement. |
| Pattern code | Hollow, solid or intermediate distribution using brand-specific letters. | Exact manufacturer’s code definition. |
| Series or model | Construction or product family. | Current technical data and revision. |
| Date or lot information | Traceability, not necessarily performance. | Supplier documentation when relevant. |
Seven specification checks
- Record every character and symbol before discarding the old nozzle.
- Identify the manufacturer and exact product series.
- Confirm the reference pressure for the rated capacity.
- Match angle and pattern to approved appliance data.
- Check thread, dimensions and filter construction.
- Do not translate one brand’s pattern letter using another brand’s legend.
- Commission the verified replacement with combustion testing.
Capacity marking and actual flow
The capacity in oil burner nozzle markings is tied to a reference condition. If pump pressure differs, actual flow changes. Use the supplier’s conversion data or the square-root pressure relationship only as an estimate, and remain within the burner’s approved firing range.
Pattern letters are not universal
A letter used for a hollow or solid pattern by one manufacturer may mean something different in another catalog. Even when descriptive labels match, internal construction and distribution can differ. Cross-reference from verified technical documentation rather than memorized letter codes.
Photograph and record before replacement
Clean the exterior only enough to read the designation without disturbing precision surfaces. Photograph the marking, burner model, pump setting and installed orientation. If the marking is incomplete, use the appliance service data and supplier support rather than guessing the missing field.
Replacement acceptance
Correct oil burner nozzle markings do not complete the job. Verify installation, leakage, ignition and combustion using the approved procedure. Retain the replacement part number and measured settings for future maintenance.
Next step
Use markings to identify a candidate, then use approved equipment data to authorize it. Review OD oil burner nozzle, review related Jeltecn nozzle products, eller send application data to Jeltecn for an engineering review.