EP-CMW2.2-0.8 Oil-Free Scroll Air Compressor
The EP-CMW2.2-0.8 is a 2.2 kW oil-free scroll air compressor delivering 255 L/min at 0.8 MPa — engineered for precision industries demanding pure, contamination-free compressed air with ultra-low noise and minimal maintenance requirements.
EP-CMW2.2-0.8: Compact Oil-Free Scroll Air Compressor for Precision and Medical Applications
The EP-CMW2.2-0.8 oil-free scroll air compressor is the entry model in Ever Power's CMW series -- a 2.2 kW (3 HP) unit delivering 255 L/min of certified oil-free air at working pressures between 0.2 and 0.8 MPa. Designed for environments where compressed air purity is non-negotiable, this model serves dental clinics, analytical laboratories, electronics assembly cells, and small precision spray booths. Its 49 +/- 3 dB(A) acoustic rating and footprint of 670 x 630 x 945 mm allow installation directly at the point of use without a dedicated compressor room.
Because the scroll compression mechanism operates without any lubricant in the compression chamber, the air output is structurally oil-free -- not merely filtered. This eliminates residual contamination risk that persists even with downstream coalescing filters on oil-injected machines. For applications governed by ISO 8573-1 Class 0 air quality requirements, the EP-CMW2.2-0.8 delivers compliance by design rather than by filtration. Browse our full oil-free compressor range to compare models across the complete power and pressure spectrum.
Ever Power Scroll Technology: Engineering Authority Behind the CMW Series
Ever Power has invested more than a decade in oil-free compression research, progressing from water-lubricated screw compressors through 4.0 MPa two-stage systems before designing the CMW scroll series as an entirely independent architecture. Unlike competitors who adapt HVAC scroll designs for industrial use, Ever Power developed its scroll profiles and housing geometry specifically for continuous-duty industrial environments. The company contributed to the drafting of national industry standards JB/T 11882-2014 and JB/T 12565-2015, and the CMW platform became the world's first scroll compressor to reach 1.2 MPa discharge pressure. Every unit in the range -- including the EP-CMW2.2-0.8 -- carries an unconditional 2-year air-end warranty.
Core Features of the EP-CMW2.2-0.8
High-Precision Square Air-End -- 2-Year Warranty
The world-first high-stiffness square air-end design ensures stable output pressure and minimises scroll flex under cycling loads, directly extending tip seal life and maintaining volumetric efficiency over thousands of operating hours. The 2-year air-end warranty is backed unconditionally.
2.2 kW Permanent Magnet Motor -- Over 10% Efficiency Gain
The inverter-driven permanent magnet motor improves overall system efficiency by more than 10% compared to standard induction motors. IP65 protection and F-class insulation make it suitable for dusty or humid production environments.
Direct Drive -- No Belt, No Coupling, No Adjustment
Motor and air-end are connected directly, eliminating belt stretch, coupling misalignment, and the associated maintenance intervals. This also removes the primary source of vibration in belt-driven machines, contributing directly to the 49 dB(A) noise rating.
Intelligent PLC Controller with Real-Time Display
The built-in PLC panel displays discharge temperature, working pressure, cumulative run hours, maintenance reminders, and fault alarms continuously -- giving operators full operational visibility without additional monitoring hardware.
Independent Cooling Fan -- Near-Ambient Discharge Temperature
A dedicated cooling fan keeps discharge air temperature close to ambient, minimising moisture content in the compressed air stream and reducing the load on any downstream drying equipment -- a key advantage for humidity-sensitive processes such as electronics assembly and laboratory instrumentation.
Stainless Steel Pipework and 1 Micron Inlet Filtration
All air-contact surfaces use stainless steel, preventing rust contamination in the air stream. The 1 micron precision inlet filter protects the scroll mechanism from abrasive particulate, preserving tip seal integrity over extended service intervals.
How Oil-Free Scroll Compression Works
Scroll compression relies on the orbital motion of a moving scroll (rotor) against a stationary scroll (stator). Air enters from the periphery of the scroll pair and is sealed into crescent-shaped pockets formed between the two involute profiles. As the orbiting scroll traces its circular path, these pockets migrate toward the centre of the assembly while continuously decreasing in volume -- compressing the trapped air without pulsation. At the centre, compressed air is discharged smoothly through the exhaust port. This process is continuous: while one pocket is discharging, others at different stages of compression are forming and shrinking simultaneously, producing a perfectly steady air stream. Because the compression is achieved entirely by geometry -- tight scroll tolerances and precision tip seals -- no oil is needed at any point in the cycle.
Technical Specifications -- EP-CMW2.2-0.8
| Parameter | Specification |
|---|---|
| Model | EP-CMW2.2-0.8 |
| Motor Power | 2.2 kW / 3 HP |
| Working Pressure Range | 0.2 - 0.8 MPa |
| Free Air Delivery (FAD) | 255 L/min |
| Noise Level | 49 +/- 3 dB(A) |
| Outlet Connection Size | 1/2 inch (stainless steel) |
| Weight | 132 kg |
| Dimensions L x W x H | 670 x 630 x 945 mm |
| Air-End Warranty | 2 Years |
| Drive Type | Direct Drive (no belt, no coupling) |
| Motor Type | Permanent Magnet, IP65, F-class insulation, >94% efficiency |
| Inlet Filter Precision | 1 micron |
| Lubrication | Oil-Free (bearing grease once per year only) |
Target Industries and Applications
| Industry | Application |
|---|---|
| Medical and Dental | Dental chair air, surgical tools, patient ventilators |
| Electronics Manufacturing | PCB cleaning, SMT pick-and-place, wave soldering |
| Laboratory and Analytical | Gas chromatography, mass spectrometry, clean-room instruments |
| Precision Spray Coating | Airbrush finishing, UV coating, lacquer application |
| Food and Beverage | Pneumatic packaging, bottle blowing, food-contact pneumatics |
Customer Case Studies
Australia -- Dental Clinic Group
Eliminating Patient Noise Complaints in a Multi-Chair Clinic
A six-chair private dental practice in Melbourne had received repeated patient feedback about compressor noise during treatments, and a hygiene audit flagged their ageing oil-piston unit as a risk. After fitting the EP-CMW2.2-0.8, clinical staff reported that patients in the waiting area could no longer hear the compressor running. The oil-free output met Australian dental compressed air standards without additional filtration, and the next hygiene inspection passed with no compressed air findings. The practice manager also noted the PLC fault alarm as particularly useful -- the unit alerted staff to a partially blocked inlet filter before any pressure drop affected treatment.
★★★★★
"Patients can no longer hear it, and we passed our audit clean. The fault alarm caught a filter issue before it became a problem." -- Practice Manager
Netherlands -- PCB Assembly Workshop
Removing Oil Contamination Risk from an SMT Production Line
A precision electronics manufacturer near Eindhoven producing high-frequency circuit boards needed a guaranteed oil-free air source for their SMT assembly line. Occasional residue from their previous oil-injected system -- even with downstream filtration -- caused pad delamination issues on fine-pitch components, triggering costly rework cycles. Fourteen months after installing the EP-CMW2.2-0.8, the client recorded zero oil-related rework incidents and reduced compressed air-related maintenance time by around 60%. The unit's 49 dB(A) rating also allowed it to be positioned on the production floor without disturbing assembly technicians.
★★★★★
"Zero oil-related rework events in over a year. The size and noise level mean we positioned it right on the floor." -- Process Engineer
Canada -- University Research Laboratory
Bench-Fit Compressor for GC and Mass Spectrometer Air Supply
A materials science department at a Canadian university needed a compact oil-free air source for a gas chromatograph and mass spectrometer cluster. Space constraints limited them to a unit under 700 mm wide. The EP-CMW2.2-0.8's 670 mm width fitted under a workbench, and its 49 dB(A) operation allowed researchers to work in the same room without hearing protection. The stable, pulse-free air delivery measurably improved instrument baseline consistency. Staff also noted that the annual grease-only maintenance schedule was significantly simpler than managing an oil-based system.
★★★★
"Fits under the bench, runs quietly, and our instrument baselines are more consistent than before." -- Senior Lab Technician
Frequently Asked Questions -- EP-CMW2.2-0.8
Is the EP-CMW2.2-0.8 truly 100% oil-free throughout the compression cycle?
Yes. No lubricant enters the compression chamber at any stage of the process. The scroll profiles and precision tip seals form the compression seal by geometry alone, producing structurally oil-free air that meets ISO 8573-1 Class 0 for oil content by design rather than by downstream filtration.
What does the maintenance schedule look like for this unit?
Scheduled consumables are limited to the inlet air filter element and the tip seal ring, replaced at intervals based on PLC-logged operating hours. Scroll bearings require a grease addition once per year. There is no oil to change, no oil separator element, and no oil drain -- the maintenance overhead is far lower than oil-based compressors of equivalent output.
How quiet is 49 dB(A) in a real working environment?
49 dB(A) is approximately the level of a quiet library or a subdued conversation at close range. In a typical production room with reflective walls, measured ambient levels near the unit may be 2-3 dB higher. In practice, this means the EP-CMW2.2-0.8 can operate in open-plan offices, clinical areas, and shared workspaces without causing disturbance or requiring hearing protection for nearby staff.
Can this compressor operate continuously without overheating?
The EP-CMW2.2-0.8 is rated for continuous duty operation. The independent cooling fan actively removes heat from the discharge air and scroll housing, keeping temperatures near ambient even under sustained load. The PLC controller monitors discharge temperature in real time and triggers a protective fault alarm and controlled shutdown if the upper thermal threshold is approached.
Does this unit need a downstream dryer to be usable?
Not necessarily -- it depends on your application's moisture tolerance. The independent cooling fan keeps discharge temperature close to ambient, which naturally reduces the moisture content of the output air compared to high-temperature compressors. For applications requiring a specific dew point such as instrument air or food-contact pneumatics, a refrigerated or desiccant dryer should be added downstream.
Start Your Enquiry -- EP-CMW2.2-0.8
The EP-CMW2.2-0.8 is available for immediate enquiry. Ever Power's team provides technical application support, detailed datasheets, and guidance on configuration options including single-unit, multi-air-end, and individual air-end set deployments. Explore our full oil-free compressor product range, learn more about Ever Power's engineering credentials, or contact us directly to discuss your requirements.
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