Condor · MDR 11
MDR 11 single-phase
Condor's MDR 11 is the single-phase pressure switch fitted to most European-built recips. It carries an integral on/off lever, an unloader, and metric G1/4 ports — plan on an adapter for NPT plumbing.
Specifications
- Action
- Standard — contacts open on rising pressure
- Adjustable range
- Build dependent, commonly 60–175 psi
- Differential
- Adjustable on most builds (adjustable)
- Factory settings
- Typically 116/145 psi (8/10 bar) · 145/175 psi on high builds
- Ports
- G1/4 metric (1/4 in. NPT adapter needed in North America)
- Unloader
- Integral unloader standard
- Lever / disconnect
- Integral on/off lever
- Enclosure
- IP44 typical
- Temperature
- -5 °F to 158 °F typical
Electrical
- Single-phase, up to 16 A depending on build
- Integral on/off lever switches both poles
- Some builds include a thermal overload module
Size against motor full-load amps with the motor amperage calculator, and check feeder sizing with the voltage drop calculator.
Adjustment
- Range screw sets cut-out; the smaller differential screw sets the gap on adjustable builds.
- Settings are marked in bar — convert before you dial (1 bar ≈ 14.5 psi).
Before you open the cover
Kill power at the disconnect and lock out. Bleed the tank to 0 psi. Never set cut-out above the tank data-plate MAWP. Verify your numbers first in the cut-in / cut-out calculator.
Best fit
- ABAC, Fini, Fiac, Nuair and other European recips
- Any machine already plumbed metric
Watch out
- Do not thread NPT straight into a G port — it will seal for a while and then weep.
- Some MDR 11 builds include the motor overload; a generic replacement without it leaves the motor unprotected.
Cross-references
- Lefoo LF10 (functional, NPT ports)
- Square D 9013FHG12J52 with adapters