EMAX 7.5 HP 120-Gallon Rotary Screw Air Compressor — 460V 3-Phase, 29 CFM, Single-Stage, with 30 CFM Refrigerated Dryer & Swing-Arm Mount (ERVK070003-460)

The EMAX 7.5 HP rotary screw air compressor delivers 29 CFM at 100 PSI and up to 145 PSI maximum on 460V three-phase power, with an integrated 30 CFM refrigerated air dryer sized to match the compressor's full output. It is built for shops and light-industrial operations that run air tools, plasma cutters, sandblasters, or production equipment long enough that a piston compressor would overheat — the oil-injected rotary screw air end is rated for 100% duty cycle, so it can run continuously without a forced cool-down period.

At its core is a single-stage, oil-injected rotary screw air end built around a male-and-female rotor design with an estimated 100,000-hour service life. Air moves through an air/oil separator and an air-cooled aftercooler before it reaches the tank, pulling out heat and moisture along the way. Power reaches the air end through a two-belt V-belt drive that uses wider B- and C-width belts to spread the load over more surface area, lower belt tension, and cut noise and vibration — the 7.5 HP unit runs at about 62 dB(A). The totally enclosed, fan-cooled (TEFC) motor turns at 1750 RPM and draws 10.4 full-load amps, including a 1.15 service factor, on a 460V three-phase circuit.

An onboard digital control panel runs the compressor and shows operating pressure and temperature, with start, stop, and emergency-stop controls and six built-in maintenance notifications that flag when it is time to service filters, oil, and other wear items. The motor and cabinet are VSD-ready — a variable-speed drive can be added later through EMAX if your air demand swings widely.

Compressed air then passes through the integrated refrigerated dryer before it reaches your lines, where a condenser and cooling fan pull moisture out of the air stream so tools, dies, and finishes stay dry. The package is mounted on a matte-black 120-gallon horizontal receiver tank, plumbed with braided hydraulic hoses, and fitted with a dual-timer electric automatic tank drain that expels condensate on a schedule you set — anywhere from 1 to 45 minutes — with an air muffler for quiet discharge.

A swing-arm dryer mount lets the dryer hinge away from the compressor cabinet, opening up room to reach filters, belts, and the air end during service without unbolting the dryer.

This unit ships by freight and requires a 460V three-phase circuit on a dedicated line — confirm your shop's service before ordering. To arrange freight delivery or check electrical requirements, email sales@mygaragesupplies.com or call 307-381-1810.

• 100% duty-cycle rotary screw air end — oil-injected single-stage design runs continuously without cool-down cycles.
• Two-belt V-belt drive — B- and C-width belts lower tension and reduce noise and vibration, with the 7.5 HP unit running at about 62 dB(A).
• Integrated 30 CFM refrigerated dryer — matched to the compressor's 29 CFM output to dry the full air stream.
• Onboard digital control panel — shows operating pressure and temperature, with start/stop and emergency-stop controls and six automatic maintenance notifications.
• Swing-arm dryer mount — the dryer hinges away from the cabinet for service access to filters, belts, and the air end.
• Automatic tank drain — dual-timer electric drain with adjustable 1-to-45-minute intervals and an air muffler for quiet discharge.
• TEFC, VSD-ready motor — totally enclosed and fan-cooled for dusty shops, with a VSD-compliant motor and cabinet for an optional variable-speed conversion.

• 7.5 HP single-stage, oil-injected rotary screw air compressor
• Integrated 30 CFM refrigerated air dryer
• 120-gallon matte-black horizontal receiver tank
• Swing-arm dryer mount
• Dual-timer electric automatic tank drain with air muffler
• Braided hydraulic hoses

EMAX backs the compressor with a 1-year standard warranty covering the rotary screw pump and all components, including the electric motor, against defects in materials and workmanship from the date of delivery, with one year of labor through an authorized technician. The integrated refrigerated dryer carries its own 1-year standard warranty on parts, workmanship, and labor.

Both can be extended. Enrolling in EMAX's scheduled-maintenance program — changing oil and filters on the published schedule using EMAX SMART OIL — extends the compressor to up to 10 years on the rotary screw pump and the three-phase motor and 5 years on the remaining components, and extends the dryer to 3 years. Extended and lifetime coverage require staying current on the maintenance schedule. Full terms are in the warranty documents below.

What electrical service does this compressor need?

It runs on 460V three-phase power and draws 10.4 full-load amps, including a 1.15 service factor, with a locked-rotor draw of 66.2 amps. Run it on a dedicated circuit, with breaker and wire sized to the motor nameplate and your local electrical code by a licensed electrician. Confirm your shop has 460V three-phase service before ordering.

Can this compressor run as a variable-speed unit?

It ships as a fixed-speed unit with a Wye-Delta start. The motor and cabinet are VSD-ready, so a variable-speed drive can be added later through EMAX if your air demand varies widely.

Can it run continuously, or does it need to cool down?

The oil-injected rotary screw air end is rated for 100% duty cycle, so it can run continuously without the cool-down cycles a piston compressor needs.

Does it include an air dryer?

Yes. A 30 CFM refrigerated air dryer is integrated into the package and matched to the compressor's 29 CFM output, so it dries the full air stream before it reaches your lines.

How does the tank drain work?

A dual-timer electric automatic drain expels condensate from the receiver tank on an interval you set, anywhere from 1 to 45 minutes, and includes a muffler for quiet discharge.

• Rotary Screw Compressor User Manual (PDF)
• Refrigerated Air Dryer Instructions Manual (PDF)
• Rotary Screw Compressor Warranty (PDF)
• Refrigerated Air Dryer Warranty (PDF)