ENERGY EFFICIENT CONTROL SYSTEM
For proven maximum energy savings Curtis offers on line-off line or start-stop control with delay off timer. Optional modulation may also be added (Modulation is standard on 25 HP+). During unload cycle sump drops to low pressure resulting in an additional 10-12% electrical savings over conventional systems when in idle mode.

INSTRUMENTATION
Display includes discharge and sump pressure gauges, temperature gauge, hour meter, dual high air/oil shutdown switches with light, start-stop/reset buttons, dual control switch, no load start switch, standby light, and power-on light.

RUGGED AIR END DESIGN
All Curtis Air Ends are manufactured to ISO 9001 Certification and are built for 100% duty cycle. Zero wear Curtis rotors run in an oil bath and have no metal to metal contact. In most cases, our rotors and bearings are larger by horsepower range than competitive units.

LEAK FREE DESIGN
With substantially reduced fittings along with high quality steel tubing and o-ring sealed hydraulic connections, Curtis units are designed to eliminate potential leaks.

CONTROL CABINET
Conveniently located with hinged access door. Built-in across the line magnetic motor starters with thermal overload protection ensures long motor life. 115 volt control circuit transformer is provided for safe operation. Standard NEMA 1 Rated cabinet and electrical controls are U.L. and CSA listed. All electrical components are standard off the shelf for easy replacement.

ELECTRIC MOTORS
The R/S Series is designed using off the shelf motors and drive train parts. Heavy duty NEMA design motors with a 1.15 to 1.25 service factor are used to ensure dependable long life.

SIDE BY SIDE AIR/OIL COOLERS
This arrangement allows for very low approach temperatures vs. less efficient "stacked" design. This increases overall efficiency and provides for a cooler running compressor. Thermostatically controlled oil bypass valve insures proper oil temperature to extend air end life. Side by side coolers also offer easy access for cleaning.

"R/S" ROTOR PROFILE
INCREASED EFFICIENCY - The CURTIS "R/S" Profile with it's high precision finish offers the shortest possible sealing line to ensure minimal internal losses. This design along with low rotational speeds give you maximum CFM output per energy dollar. The "R/S" profile allows for extra CFM output even at pressures as high as 175 PSIG.

LONG LIFE-LARGE DIAMETER BEARINGS
Large cylindrical roller bearings are designed for years of continuous service. Precision ball bearings with angular thrust contact provides twice the needed thrust loading. Bearings are a significant part of any air end and Curtis puts an emphasis on their long life bearings.

OIL SEPARATORS
VERTICAL MULTI-STAGE SEPARATION - First stage separation is achieved by offset air/oil inlet and special baffling which centrifugally separates 95% of oil from air.

Second stage separator element is sized so that even under maximum capacity flow, the velocity through the filter is less than 1 ft./sec. for maximum efficiency. Our separator element will last longer due to our unique oversized design. This oil separation system provides virtually oil-free air.

ASME CODED, VERTICAL SEPARATOR TANK saves space and reduces turbulence to prevent oil carryover. Separator tank is equipped with oil-fill vent plug, oil level sight glass, safety relief valve, and minimum pressure check valve.