EP-CMW4.4-0.8 Oil-Free Scroll Air Compressor
The EP-CMW4.4-0.8 pairs two 2.2 kW scroll heads in one cabinet to deliver 510 L/min of certified oil-free air at 0.8 MPa — a dual-air-end design offering built-in redundancy, modular capacity, and ultra-quiet 52 dB(A) operation for pharmaceutical, precision coating, and multi-station industrial environments.
EP-CMW4.4-0.8: Dual-Head Oil-Free Scroll Compressor with Built-In Redundancy at 0.8 MPa
The EP-CMW4.4-0.8 takes a different engineering approach from single-head scroll compressors: rather than scaling up motor power on a single scroll mechanism, it combines two 2.2 kW scroll air-ends inside one compact cabinet. The result is 510 L/min of certified oil-free air at up to 0.8 MPa, with a noise rating of 52 +/- 3 dB(A) and dimensions of 800 x 650 x 1020 mm. The dual-head architecture delivers two significant advantages that a single-head 4 kW unit cannot match: inherent operational redundancy and demand-responsive load sharing. If one scroll head requires a scheduled maintenance stop, the second head continues supplying air without interruption. Explore the complete EP-CMW series to compare all single and multi-head configurations.
For pharmaceutical clean rooms, precision coating lines, and laboratory networks requiring continuous air availability, the EP-CMW4.4-0.8's dual-head design transforms what would otherwise be a single point of failure into a resilient, self-managing compressed air system. The intelligent PLC controller automatically rotates the lead and standby heads to equalise running hours across both units, maximising combined service life.
Engineering Foundation: Why Ever Power Chose Multi-Head Architecture
Ever Power's scroll compressor engineering team recognised early in the CMW programme that simply increasing scroll head size to produce more air volume introduces diminishing returns in heat dissipation and scroll geometry precision. The multi-head approach -- housing two or more optimised scroll mechanisms in one cabinet with shared control -- preserves the performance characteristics of the smaller, precision-engineered head while multiplying output capacity. This is the same principle that led to the development of the full multi-air-end system accommodating up to four heads. The EP-CMW4.4-0.8 represents the two-head step in this progression. The company contributed to the drafting of national standards JB/T 11882-2014 and JB/T 12565-2015 and holds the distinction of manufacturing the world's first 1.2 MPa oil-free scroll compressor. Both air-ends in the EP-CMW4.4-0.8 carry the standard 2-year warranty.
Key Features
Dual 2.2 kW Scroll Heads -- Inherent Redundancy
Two independent scroll mechanisms in one cabinet mean that scheduled maintenance on one head does not interrupt air supply -- the second head continues operating. This built-in redundancy is essential for processes where compressed air downtime has direct production cost implications.
Intelligent Load-Sharing PLC Control
The PLC controller monitors air demand and automatically starts and stops individual heads to match actual consumption. When demand is low, only one head runs; at peak demand, both operate simultaneously. This avoids the energy waste of running at full capacity when partial capacity suffices.
Automatic Lead/Standby Head Rotation
The controller automatically alternates which head acts as the primary unit and which is on standby, equalising cumulative running hours across both mechanisms. This extends the combined service life of the unit significantly beyond what a single-head machine achieves at equivalent total hours.
510 L/min at 52 dB(A) -- Quiet Dual Capacity
Delivering 510 L/min -- 26% more than the single 3.7 kW model -- while maintaining 52 +/- 3 dB(A) noise, the EP-CMW4.4-0.8 provides mid-range volume capacity without the acoustic penalties typically associated with higher-output compressors.
Stainless Steel Air Path and 1 Micron Inlet Filtration
All air-contact surfaces including both outlet manifolds and the integrated storage tank use food-grade stainless steel. Dual 1 micron inlet filters protect each scroll head independently, preventing cross-contamination between the two air paths during any maintenance procedure.
Permanent Magnet Motors -- Over 94% Efficiency Each
Both scroll heads use direct-drive permanent magnet motors with IP65 protection and F-class insulation. Each motor individually achieves over 94% efficiency, meaning the combined system operates at high efficiency across its full load range rather than only at peak output.
Working Principle: Coordinated Dual-Head Scroll Compression
Each of the two scroll heads in the EP-CMW4.4-0.8 operates on the same fundamental principle: an orbiting scroll traces a tight circular path against a fixed scroll, creating crescent-shaped compression pockets that progressively decrease in volume as they migrate toward the central discharge port. The two heads operate independently but are coordinated by the shared PLC controller, which manages start/stop sequencing and load rotation. Air from both heads flows into a common stainless steel manifold before reaching the outlet, producing a single combined flow stream of up to 510 L/min. Because both heads use oil-free scroll compression, the combined output is structurally oil-free throughout -- not merely filtered.
Full Technical Specifications
| Parameter | Specification |
|---|---|
| Model | EP-CMW4.4-0.8 |
| Configuration | Dual Air-End (2 x 2.2 kW scroll heads) |
| Total Motor Power | 4.4 kW / 6 HP |
| Working Pressure Range | 0.2 - 0.8 MPa |
| Free Air Delivery (FAD) | 510 L/min |
| Noise Level | 52 +/- 3 dB(A) |
| Outlet Connection Size | 1/2 inch (stainless steel) |
| Weight | 150 kg |
| Dimensions L x W x H | 800 x 650 x 1020 mm |
| Air-End Warranty | 2 Years per head |
| Motor Type | Permanent Magnet x2, IP65, F-class, >94% efficiency each |
| Drive Type | Direct Drive (no belt, no coupling) |
| Control System | Intelligent PLC with demand-based load sharing and head rotation |
| Tank and Pipework | Stainless Steel |
| Inlet Filtration | 1 micron per head |
| Lubrication | Oil-Free (annual bearing grease only) |
Industry Applications
| Sector | Application | Key Advantage |
|---|---|---|
| Pharmaceutical Manufacturing | Clean room pneumatics, tablet press air, vial-filling lines | Continuous oil-free air with no single point of failure |
| Precision Spray Coating | Multi-gun automotive and industrial coating booths | Higher volume with same oil-free quality as single-head units |
| Medical Apparatus | Central supply for multi-room medical facilities and hospitals | Dual redundancy meets continuous availability requirements |
| Electronics Assembly | Multi-station SMT lines, wave soldering, AOI systems | Greater air volume for larger production cell configurations |
| Precision Machine Tools | CNC machining centres with multiple simultaneous air demands | Load-sharing eliminates pressure droop during concurrent tool changes |
Customer Case Studies -- EP-CMW4.4-0.8
Colombia -- Pharmaceutical Clean Room
Uninterrupted Air Supply for a GMP Tablet Coating Line
A Colombian pharmaceutical manufacturer producing film-coated tablets required a compressed air source that could sustain coating pan operation during scheduled compressor maintenance without production interruption. Their previous single-head unit required a full line stop every 2,000 hours for servicing. After installing the EP-CMW4.4-0.8, maintenance technicians service one head while the second head continues supplying coating pan air at reduced but sufficient flow. The client reported eliminating all maintenance-related production stops on that line, recovering approximately 18 hours of production time per year.
★★★★★
"No more maintenance shutdowns on the coating line. We service one head while the other runs -- the line never stops." -- Production Director
Australia -- Industrial Spray Coating Workshop
Scaling Air Capacity for a Multi-Gun Automotive Refinishing Bay
An automotive refinishing centre in Sydney operating four spray booths simultaneously found their single-head 3.7 kW unit struggling to maintain pressure when all four guns were active concurrently. The EP-CMW4.4-0.8's 510 L/min output provided the additional headroom needed, and the load-sharing control meant that during quieter single-booth periods only one head ran -- reducing electricity consumption measurably compared to running a larger single-head unit at constant full load. The workshop owner noted the 52 dB(A) noise level as a significant benefit in an operator-occupied refinishing bay.
★★★★★
"Four booths running simultaneously with no pressure sag. And quieter than our old single-head unit somehow." -- Workshop Owner
Canada -- Hospital Central Air System
Redundant Oil-Free Air for Critical Medical Instrumentation
A Canadian regional hospital replacing an aging reciprocating compressor system in their central medical air distribution network specified the EP-CMW4.4-0.8 for a secondary instrument air circuit serving diagnostic imaging equipment and procedure room pneumatics. The dual-head redundancy satisfied the facility engineer's requirement for no single point of failure, and the oil-free output eliminated the need for a dedicated medical air processor downstream. Over 20 months of operation, the unit required only two inlet filter replacements and one grease addition -- confirming the maintenance simplicity the facility team had been promised.
★★★★★
"Meets our redundancy requirement, oil-free without extra filtration, and the maintenance record over 20 months has been exactly as simple as described." -- Facilities Engineer
Frequently Asked Questions -- EP-CMW4.4-0.8
What is the real advantage of dual scroll heads over a single larger head?
A dual-head configuration provides built-in operational redundancy -- if one head requires maintenance, the second continues supplying air without interruption. It also enables demand-responsive load sharing: at low demand, only one head runs, saving energy; at peak demand, both operate simultaneously. A single larger motor cannot offer either of these capabilities.
Can both heads run simultaneously at full combined output?
Yes. When system pressure drops to the lower setpoint -- indicating high air demand -- the PLC controller starts both heads to deliver the full 510 L/min. It monitors pressure continuously and automatically adjusts which heads are running to match actual consumption, cycling back to single-head operation when demand reduces.
How does the automatic head rotation extend service life?
The PLC tracks cumulative running hours for each scroll head independently and automatically alternates which acts as the primary lead unit. This equalises wear across both mechanisms over time. Instead of one head accumulating 8,000 hours while the second sits on standby, both heads share the load and approach service intervals simultaneously -- a far more efficient use of both capital and maintenance resources.
Is this unit suitable for pharmaceutical GMP compressed air applications?
Yes. The structurally oil-free output is compatible with GMP pharmaceutical manufacturing air quality requirements. The dual-head redundancy additionally supports continuous process mandates in pharmaceutical facilities where an air supply interruption would trigger a batch failure event or regulatory non-conformance. For specific pharmacopoeial air quality classes, appropriate downstream drying and filtration should be specified.
What happens if one scroll head develops a fault during operation?
The PLC controller continuously monitors the operating status of both heads and triggers a fault alarm with a specific error code on the display panel if either head encounters an abnormal condition. The second head continues operating normally, maintaining air supply to the process. The fault alarm and PLC-logged operating data help the maintenance technician identify the issue quickly for targeted servicing.
Enquire About the EP-CMW4.4-0.8
The EP-CMW4.4-0.8 is the right choice when both oil-free air quality and operational continuity are non-negotiable. Ever Power's engineering team can assist with system sizing, configuration selection, and integration guidance for single-unit and multi-unit installations. Learn more about Ever Power's manufacturing and engineering background or review the complete EP-CMW product range across all power and pressure options.
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