LEFOO LF15 Air Compressor Pressure Switch
Mechanical air-compressor pressure switch in the LEFOO LF15 family. The correct operating range, contact wiring and hydraulic or pneumatic installation depend on the ordered variant.
Model Identification & Key Specifications
Manufacturer Technical Data
Maker gives adjustable 0.3–1.2 MPa and differential 0.15–0.45 MPa, versus maximum working pressure 1.2 MPa; factory adjustment is customer specified. NC 120VAC 26A or 240VAC 20A, optional manual lever/unloader and one/two/four process ports. Do not infer IP54; OEM LF15 listing specifies IP20, important for exposed compressor installations.
AirAlign Engineering & Selection Analysis
The documented IP20 enclosure needs appropriate protection from water, dirt and access to live terminals. IP54 claims from unrelated LF series do not apply; verify the final compressor panel’s exposure and cable-entry arrangement.
Correct system operation is determined by the restart threshold, stop threshold, motor electrical duty and the available pressure supply. An adjustment range does not imply every combination is approved: compare manufacturer-specified differential, pressure proof, operating medium and fitting. For motor-driven equipment, locked-rotor conditions, overload protection and cycling frequency are separately important even where a contact-current rating is published.
Installation, Compatibility & Protection
Specify both cut-in and cut-out conditions for the intended equipment, and verify the manufacturer’s permitted hysteresis. Do not use proof or burst pressures as running thresholds.
NO and NC contacts have different protection and restart behavior. Match the wiring schedule and motor/contactor duty, rather than relying only on voltage and ampere numbers.
Verify actual air versus water compatibility, wetted materials, connection thread standard, sealing method and temperature of the process. The manufacturer variant must support the full application.
A maker-hosted CE, TÜV, UL or CSA record may cover only stated models and revisions. It is not equivalent to proof of ATEX/IECEx approval or a finished installation certificate.
LF15 Variant and Application Decision Guide
The manufacturer describes LF15 as a tank-pressure controller for compressed air and non-flammable, non-hazardous, non-corrosive gases. It should not be assumed suitable for combustible gases or an Ex installation. Selection depends on the exact mechanical and electrical ordering options, not just the name LF15.
| Maker-specified LF15 family parameter | Published range or option | Selection implication |
|---|---|---|
| Pressure adjustment | 0.3–1.2 MPa | Choose the required cut-out within the configured operating class. |
| Differential | 0.15–0.45 MPa | Check restart pressure and the compressor duty cycle. |
| Pressure setting tolerance | ≤5% of operating pressure value | Do not treat an adjustment-scale marking as a calibration certificate. |
| Electrical contact | Normally closed; 26 A / 120 VAC or 20 A / 240 VAC (maker listing) | Verify motor circuit current, voltage and starting arrangements. |
| Connection options | Female 1-port, male 1-port, female/male 2-port, female 4-port | Match port number, thread and additional gauge/valve needs. |
| Optional hardware | Unloader valve and manual mode available as options | Check whether either is included on the delivered part. |
| Working temperature / enclosure | −20 to +80 °C; IP20 | Confirm installation location, moisture/dust exposure and guarding. |
LF15 Installation Checks
Verify maximum permitted receiver pressure, appropriate relief protection, contact circuit ratings and the correct pressure-thread seal and support.
An optional unloader valve can reduce starting load. Check compressor pump-head unloading arrangements rather than assuming every LF15 includes one.
LEFOO lists vertical and horizontal arrangements; confirm specific drawing and tubing routing before installation.
The manufacturer lists a CSA LF15 certificate download. Its exact covered model and configuration must be checked; do not infer ATEX/IECEx coverage from a general certificate page.
LF15 vs LF10: Why They Are Not Automatic Substitutes
LF10 offers multiple published PSI operating classes with 20 A / 120 VAC and 12 A / 240 VAC for the base LF10 model, while LF15 has a separately published MPa adjustment/differential envelope and different electrical ratings. Even when the enclosure resembles another family, setpoints, connection ports, unloader behavior and ordering suffix determine interchangeability.
Primary evidence: LEFOO LF15 original technical parameters and drawings; LF10 comparison source.
Related Models & AirAlign Categories
LEFOO LF10-L Air Compressor Switch · LEFOO LF17 Heavy-Duty Air Compressor Switch · Pressure Switches · LEFOO manufacturer profile
Official Manufacturer Sources
Original maker catalogue evidence used for the model values above. Review the latest datasheet, ordering chart and approval scope for the specific suffix.
LF15 — compressor unloading and electrical contact
LF15 is a mechanical air-compressor pressure switch whose cut-out and restart points determine tank cycling. Verify whether the selected assembly includes an unloader connection and how motor inrush compares with the switch contact/contactor duty. Install appropriate relief/check valves and independent overpressure protection rather than relying on the pressure switch as a relief device. The ordered port threads and electrical cover type must match the compressor assembly.