LEFOO LF08H Cooler-Fan Pressure Switch

LEFOO LF08H — official manufacturer product photograph — LEFOO LF08H · Manufacturer photograph and original specification

LEFOO LF08H is a manufacturer-documented pressure control switch, distinct from an analog transmitter.

AirAlign engineering comparison and selection cautions

Maker gives gauge pressure setpoints 0.02–6.5MPa with six increasingly wide tolerance tiers ±0.03 to ±0.25MPa. Pressure withstand is tier-dependent 1.5–8.0MPa and must not be confused with nominal operating switchpoint. Low-pressure and high-pressure variants have different ambient and medium temperature envelopes; 6A AC claims are configuration specific, mechanical 100000 and electrical 30000 cycles maker listed. Check motor starting-current suitability and the actual contact rating.

Configuration and approval checklist

Original primary source: LEFOO LF08H manufacturer product and technical document section.

LEFOO manufacturer profile · Pressure Switches

Verified LF08H Pressure Classes & Selection

The manufacturer rates LF08H for repeated cooler-fan and refrigeration pressure control. Selection must follow the pressure class: published tolerance and withstand pressure increase as the specified actuation point rises.

Setting envelope0.02–6.5 MPa gauge; low-pressure versions below 1.0 MPa

0.02 to 0.6 MPa tier±0.03 MPa tolerance; 1.5 MPa withstand

0.6 to 1.0 MPa tier±0.05 MPa tolerance; 2.0 MPa withstand

1.0 to 2.0 MPa tier±0.07 MPa tolerance; 3.0 MPa withstand

2.0 to 3.0 MPa tier±0.10 MPa tolerance; 4.0 MPa withstand

3.0 to 4.0 MPa tier±0.15 MPa tolerance; 5.5 MPa withstand

4.0 to 5.0 MPa tier±0.20 MPa tolerance; 6.5 MPa withstand

5.0 to 6.5 MPa tier±0.25 MPa tolerance; 8.0 MPa withstand

IP protectionIP67 per original LF08H maker listing

Electrical selection24–250 VAC, 0.02–6 A maker family reference; output alternatives depend on variant

Mechanical / electrical life100,000 / 30,000 cycles maker CE reference

MediaAir, water, oils, lubricants, refrigerants and compatible hydrocarbons

Pressure control versus component survival

Do not select LF08H by assuming its highest stated 8 MPa withstand pressure applies to every setting range. For example, the 0.02–0.6 MPa tier has a separately stated 1.5 MPa withstand limit. Burst pressure is also not an allowed operating setpoint.

Fan cycling, temperature and contacts

Low-pressure versions have maker ambient range −40 to +65 °C and medium range −40 to +80 °C; high-pressure versions have maker ambient up to +120 °C and media up to +135 °C. For repeatedly switching fans, verify locked-rotor motor current, contact arrangement and any external contactor/overload requirements rather than equating a 6 A resistive reference with all motor types.

Approval and manufacturer sources

LEFOO lists CE and UL component documentation for the LF08H family. The original model page sets out tiered tolerance and operating conditions. Verify the current certificate revision, model suffix and exact scope.

LF08H — fan-control pressure tolerance tiers

The LF08H cooler-fan switch has a set of pressure/tolerance tiers: a low-pressure trigger may carry a tighter absolute tolerance than a high-pressure refrigeration application. Compare the selected code’s setpoint, proof pressure and available switching differential rather than borrowing a single nominal value. A fan enable switch does not continuously measure condenser pressure, and motor starting loads may need a contactor. Confirm refrigerant medium suitability.