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3920W 120L Silent Oil Free Air Compressor 8 bar 250 L/min 1400 RPM 220V

3920W 120L Silent Oil Free Air Compressor 8 bar 250 L/min 1400 RPM 220V
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Features
Specifications
Tankcapacity: 120 Liters
Airflow: 250L/MIN
Voltage: 220V
Pressure: 8bar
Horsepower: 3940W
Weight: 110kg
Size: 120*41*90cm
Speed: 1400RPM
Highlight:

120L oil free air compressor

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250 L/min high pressure oil free compressor

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3920W air compressor without oil
Basic Infomation
Place of Origin: CHINA
Brand Name: DONGJIA
Certification: CE
Model Number: 120-980*4-120L
Payment & Shipping Terms
Product Description

3920W 120L Silent Oil-Free Air Compressor 8 bar 250 L/min 1400 RPM 220V

3920W 120L Silent Oil-Free Air Compressor 8 bar 250 L/min 1400 RPM 220V
Product Overview
Four 980W motors. 3920 watts. A 120-litre reservoir — the largest in our range. When a clinic, laboratory or production floor needs compressed air that never becomes the bottleneck, this is the oil free air compressor they specify.
3920W Quad Motor • 120L Tank • 8 bar • 250 L/min • 220v
3920W 120L Silent Oil-Free Air Compressor
Technical Specifications
Parameter Value
Model No. 120-980×4-120L
Pressure 8 bar
Displacement 250 L/min
Motor Speed 1400 R.P.M
Voltage 220V
Tank 120 L
Power 3920 W (4 × 980 W motors)
Dimensions 120 × 41 × 75 cm
Net Weight 104 kg
Lubrication 100% oil-free, no oil required
Startup Voltage As low as 175V
Operating Temperature -30℃ to 40℃
Noise Silent-type, low-noise design
Values for reference; contact us for the certified datasheet. 110V / 60Hz and other configurations available on request.
Product Introduction
There is a point at which a compressed-air system stops being a machine and becomes infrastructure. The 120-980×4-120L sits at that point: four independent 980W motors combine into 3920 watts of oil-free output, feeding a 120-litre tank that holds the largest air reserve we build. At 8 bar it delivers 250 litres per minute — on a standard 220V single-phase supply, no three-phase wiring required.
The reservoir is the quiet hero here. 120 litres of stored air absorbs every demand spike a busy department can throw at it: four dental chairs cycling at once, a lab full of instruments, a finishing line between coats. Because the tank carries the peaks, the four motors start and stop less often, share the workload evenly and run well below their thermal limits — the mechanism behind a recorded failure rate below 0.02%.
Like every oil free air compressor in the range, it is completely dry inside: no lubricant ever touches the air stream, so there is nothing to contaminate a patient, a sample or a finished surface — and nothing to maintain except condensate drains and intake filters. Proven from -30℃ to 40℃, it is engineered to be installed once and forgotten.
Features & Characteristics
🔧
Quad-Motor Redundancy
Four independent 980W units stage and share the load. Even if one is offline for service, the remaining three still deliver 75% of rated flow — no clinic cancels its afternoon, no line halts.
🛢️
120L Reserve Tank
The largest reservoir in the range. Stored air absorbs demand spikes, drastically reducing motor start-stop cycles and smoothing pressure for sensitive instruments.
🏠
Runs on 220V Single-Phase
3920W of output without needing three-phase infrastructure — a genuine advantage for retrofit projects, clinics and buildings where upgrading the supply is impractical.
🛡️
<0.02% Failure Rate
A five-fold protection system — electrical, thermal and mechanical — keeps recorded motor burnout below 0.02% across the installed fleet.
❄️
Four-Layer Thermal Management
Cold-rolled steel motor cores for slower temperature rise; aluminium housings for fast heat rejection; Class F enameled wire for higher insulation limits; built-in thermal protectors trip automatically on overload.
⚡
175V Low-Voltage Startup
Dependable starting even where mains voltage sags — older buildings, rural facilities and generator-backed sites included.
💧
100% Oil-Free Air Path
No lubricant anywhere in the compression chamber. Clean air by design — no oil vapour, no after-filters to monitor, no disposal costs, no maintenance downtime for oil service.
Why Choose Us
Dental Chains & Polyclinics
Four chairs — even five with moderate usage — from a single unit on 220V. One machine, one install, one service point for the whole practice.
Laboratories
Instrument-dense benches get stable pressure and strictly oil-free air: no vapour to skew analytical results, no condensate surprises in sensitive lines.
Traders & Distributors
The range-topping model completes your catalogue ladder. Its sub-0.02% failure record protects your margin; quad-motor redundancy protects your reputation.
Brand Owners (OEM)
Flagship units carry your brand furthest. Custom colours, private labelling, control-cabinet branding and export-grade packaging for 104 kg units.
Light Industry
Spray finishing, pneumatics and small automation lines get continuous 8 bar air with zero oil mist in the product — and zero compressor maintenance days.
Factory-Direct Support
Spare-parts kits, English technical documentation and responsive after-sales from the factory that builds the machines — not a middleman.
Frequently Asked Questions
Four 980W motors or two 1680W motors — how do I decide?
The 100-series twin (3360W, 280 L/min, 70L) delivers more peak flow; this quad (3920W, 250 L/min, 120L) delivers more stored reserve and finer redundancy — losing one motor costs 25% of capacity instead of 50%. Choose by tank size and redundancy priority; both run on 220V single-phase.
Why does a bigger tank matter as much as bigger power?
Stored air is what actually serves the tool. A 120L reservoir means pressure drops more slowly between compressor cycles, motors run less often, and instruments see steadier pressure. For clinics and labs, a large tank usually improves performance more than extra wattage alone.
How many dental chairs can it realistically support?
In typical clinical duty, four chairs run comfortably with the 120L buffer; five are feasible with moderate simultaneous use. Send us your chair count and handpiece profile for a precise sizing calculation before you order.
What electrical requirements apply to 3920W on 220V?
A dedicated 220V single-phase circuit with an appropriately rated breaker (typically 25-32A) and adequately sized wiring. No three-phase supply is needed, which keeps installation simple and cost low in most buildings.
What happens when one of the four motors fails?
The remaining three continue at roughly 75% of rated flow — usually enough to keep normal operations running while the unit is serviced. Combined with a sub-0.02% recorded failure rate, total loss of air is a rare event by design.
How is a 104 kg unit shipped and installed?
It rolls into position on its four castors and needs only level flooring and clearance for airflow. For export, we use reinforced wooden crates with foam anchoring; the unit is fork liftable from the base. OEM packaging options available.
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Contact Person : Amy
Tel : +86 18964085747
Fax : 86-0513-68261098
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Shengqiang Electromechanical, Huancheng North Road, Lusi Port Town, Qidong City, Nantong City, Jiangsu Province
doris_min@ntsqjx.cn
+86 18964085747
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