Screw Compressor ATMOS SEC 221 Vario input 22 kW, capacity 3.9 m³/min, 8 bar, without tank, LOGIK 26-S, Vario Danfoss, 7-year warranty
Code: SEC221VARIO
Product detailed description
Screw Compressor ATMOS SEC 221 Vario
The ATMOS SEC 221 Vario is a 22 kW Vario compressor with a Danfoss VLT frequency converter and pressure options of 8/10/13 bar. Continuous speed regulation of the ATMOS B 100 block between 1500 and 6293 rpm — continuous output from 0 to 3.9 m³/min (at 8 bar).
The Vario version addresses idle operation. A traditional fixed-speed compressor of the same size consumes 60–70% of its nominal energy when demand drops, without producing air. The Vario continuously adjusts speed based on actual consumption — typical savings of 20–30% electrical energy for operations with intermittent demand. Dimensions 1300×920×1270 mm, weight 595 kg.
SEC 221 Vario Configuration
Specifically, this variant consists of:
Main features
Construction and Features of SEC 221 Vario
The Danfoss VLT frequency converter controls the 22 kW motor. Continuous speed regulation from 1500–6293 min⁻¹. ATMOS B 100 screw block. Slow start-up protects the block and motor from hydraulic shock. Elimination of start-up currents (no peak protection). Noise level 72 dB(A).
Design and Noise Level — 72 dB(A)
Comfort Vario design — sound-insulated steel body. Noise level 72 dB(A) (Vario significantly quieter at lower speeds — typically 65 dB(A) at 50 % capacity). IP 55.
Danfoss VLT frequency converter
Danfoss VLT industrial frequency converter with its own cooling. Communicates with LOGIK 26-S via RS-485. The display shows current performance in %, cumulative savings vs. fixed-speed mode. Typical ROI 2–3 years.
Technical Data SEC 221 Vario
BASIC DATA — SEC 221 Vario | |
| Nominal motor power | 22 kW (IE3 efficiency) |
| Operating pressure (variants) | 8 / 10 / 13 bar |
| Nominal air delivery | 3.9 / 3.2 / 2.4 m³/min |
| Rated voltage | 400 V / 50 Hz |
| Motor speed | frequency-controlled |
| Engine efficiency | 90.6 % (IE3) |
| Motor protection class | IP55 |
| Noise level (ISO 2151) | 72 dB(A) |
| Oil fill volume | 11 l |
| Compressed air outlet | G 1" |
| Hedging | 63 A |
| The temperature of the working environment | +5 ÷ +40 °C |
| Weight | 595 kg |
| Dimensions (L × W × H) | 1300×920×1270 mm |
SEC 221 Vario DESIGN | |
| Housing | Noise-reducing steel (Comfort) |
| Screw block | Atmos B 100 (ATMOS in-house production, 3D measurement) |
| Frequency converter | Danfoss VLT — smooth regulation |
| Control unit | LOGIK 26-S (microprocessor) + RS-485 |
| ATMOS Care | Integrated service interval monitoring |
| Guarantee | 7 years UNLIMITED — regardless of operating hours |
| Manufacturer | ATMOS Chrást, CZ (since 1899) |
Illustrative photo of SEC 221 Vario
Who is the SEC 221 Vario suitable for
The SEC 221 Vario is purchased by operations with variable or intermittent consumption and a requirement for a 13 bar pressure option. Typical customer: production lines with irregular demand, workshops with occasional full load, smithies with hammers operating at intervals.
Typical applications
- Production lines with irregular pneumatic consumption
- Smithies with hammers operating at intervals (pulsed consumption)
- Workshops with occasional full load + long idle periods
- Test benches with 13 bar pneumatic tests
- Glassworks with cyclic pulse blowing
- Construction central pressure stations with seasonal operation
7-year UNLIMITED warranty — unique in the Czech Republic
"We simply trust our machines! The best way to express confidence in the quality of our machines is to provide a SEVEN-YEAR UNLIMITED WARRANTY."
- No flat-rate payments
- No service contracts
- 7 years worry-free
- 7 years of operational certainty
- Online management via the ATMOS Plus app
Optional equipment — built-in heat recovery
For the SEC 221 Vario, integrated heat recovery is available as an optional accessory. The recovery heat exchanger captures the heat produced by the compressor during air compression and transfers it to a water circuit (heating, DHW heating).
- Recovers up to 72% of the input electrical energy
- Built-in solution — integrated directly into the body
- Investment return typically within 1 year of operation
- Surcharge CZK 57,375 excl. VAT (CZK 69,424 incl. VAT)
Price according to the current ATMOS price list valid from 1. 12. 2025. For a non-binding calculation proposal, contact us.
Machine control — LOGIK 26-S
The LOGIK 26-S Vario displays the speed range in real-time, current power percentage (0–100%), cumulative energy savings vs. fixed-speed mode, and pressure trend over the last 100 hours. Master/Slave mode for 2 compressors.
- Monitoring operating hours
- Master/Slave mode for 2 compressors as 1 source
- Activity and fault logs (50 days history)
- Data transmission via RS-485 bus (Modbus)
- ATMOS Care — automatic reporting of service intervals
Accessories — option: Supervisory control system ARCHON
For compressor stations with 3, 5, or 9 compressors, the supervisory control system ARCHON is available. The overall efficiency of a multi-compressor station is fundamentally influenced by the way they are controlled.
- Up to 10 daily programs — various operating modes for weekdays / weekends / holidays
- 3 control methods: by operating hours (even wear), by fixed priorities (backup units), for maximum efficiency (energy saving)
- Touch SIEMENS SIMATIC panel with clear display of all compressor statuses
- Communication with LOGIK 26-S via Ethernet / RS-485 for remote management
ARCHON is an optional accessory — for a non-binding calculation proposal for a compressor station, contact us.
Related models and alternatives
If the SEC SEC221Vario does not exactly match your operation, consider the following alternatives:
Frequently asked questions
- What is the difference between SEC 300 and SEC 302? SEC 302 has a higher output (5.2 vs 4.5 m³/min at 8 bar) for the same 30 kW motor thanks to the new Atmos A 150 screw block (vs B 100 in SEC 300). It also has significantly lower noise levels — 65 dB(A) vs 75 dB(A). SEC 302 is the premium 30 kW version.
- What does Vario mean in the model name? Vario indicates a compressor with a Danfoss VLT frequency converter, which continuously regulates the speed of the screw unit according to current consumption. It eliminates idling and saves 20–30% of electrical energy compared to a fixed-speed machine. Vario versions are ideal for operations with intermittent or variable consumption.
- Can I choose a different working pressure than the standard 8 bar?
- Yes. SEC 220 is available in 8 or 10 bar versions. SEC 221 and all larger models (SEC 300+, SEC 302+, SEC 372+) are available in 8 / 10 / 13 bar variants. At higher pressure, the output in m³/min decreases — see the technical parameters table.
- Do SEC compressors have an integrated air receiver? No. All SEC models (150 to 372) are supplied as free-standing industrial machines. The pressure vessel (air receiver) is an external accessory — available in variants of 270 / 500 / 900 / 1000 l. We recommend sizing the receiver to 4–6× the nominal flow rate per minute to equalize pressure peaks.
- What screw block is in individual models?
- SEC 220 → Atmos AB 240 (slow-running). SEC 221 and 300 + Vario → Atmos B 100 (high-speed, 4–6 thousand rpm via belt). SEC 302 and 372 + Vario → Atmos A 150 (new premium block with higher performance and lower noise level).
- What is ARCHON? ARCHON is an ATMOS master control system for coordinating 3, 5, or 9 compressors as a single compressed air source. It offers 10 daily programs + 3 control methods (operating hours / fixed priorities / highest efficiency).
- Including Ethernet for remote management.
- What does heat recovery enable? The compressor generates compression heat, which normally dissipates into the surroundings through cooling. The ATMOS heat recovery exchanger captures this heat and transfers it to the water circuit (heating, domestic hot water heating). Up to 72% of input electrical energy can be recovered — payback period typically 1 year.
Additional parameters
| Category: | SEC |
|---|---|
| Warranty: | 7 let |
| Version: | Screw compressor |
| Pressure: | 13 bar |
| Displacement: | 3 900 l/min |
| Pressure vessel volume: | bez nádoby |
| Connecting: | 1" |
| Motor power: | 22 kW |
| Mains voltage: | 400/50 V/Hz |
| Lubrication: | Oleic |
| Noise: | 72 dB(A) |
| Engine: | Electric |
| Soundproofed: | Yes |
| Drive: | Direct |
| Air dryer: | No |
| Retrieved from: | Professional |
| Development: | Stationary |
| Frequency converter: | Yes |
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A domestic company of world quality
One of the leading companies operating in the field of compressed air not only in the Czech Republic, but also in the world, is the domestic manufacturer ATMOS Chrást s.r.o., which presents itself mainly by the production of screw and piston compressors, screw blocks and motor generators. The roots of the company go back to 1899, when foundries and machine shops were established in the West Bohemian village; during the communist regime, the machine shops belonged to the national company Škoda Plzeň. It was at the end of this era that the company began licensed production of screw blocks and screw compressors, which became very popular over the years due to their reliability. Since then, ATMOS has come up with more than 25 new compressor types - creating a range of mobile, locomotive or stationary compressors that are subject to the most stringent global standards, adding the hallmark of honest design that is so much a part of ATMOS even in today's consumer age.
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A product offer for everyone
ATMOS is constantly working on new compressors and the characteristics are subject to regular technological research. As a result, the company has already come up with innovative ideas on several occasions, such as when it extremely reduced the noise level of stationary compressors without losing their top performance parameters, thanks to which they have been widely exported abroad. However, in addition to large companies, ATMOS also meets the needs of private customers with smaller workshop machines. Another breakthrough was the creation of the small and compact Albert compressors, whose product range is constantly expanding and are suitable for hobby use. More than 60 of these types are currently in production, with outputs ranging from 3 to 22 kW. The company is the youngest to launch motor generators, filling one of the gaps in the domestic market.
An overview of the compressors offered by ATMOS at Air Compressors can be found below.