SCR-APM Maxi screw compressors: technology for demanding plants
Three equipment levels, 13 modelsThe SCR-APM Maxi range is a class above workshop machines: 7.5, 11 and 15 kW and an output of 600 to 2,000 litres per minute. The engineering is the same as in the smaller range — a permanent-magnet motor above IE4, a tapered coupling to the airend with no belts, and an inverter that holds the speed to actual demand.
What does change is the equipment. TD is 4-in-1 and adds a pre-filter, so it delivers class 2-4-2 air. FF is 8-in-1 with three-stage filtration and condensate separation, and its air exceeds class 1-4-1. The receiver is 270 or 500 l depending on the model. The packages are assembled in the Czech Republic.
Where the savings come from
35 % — no idle running
The inverter varies speed smoothly with demand, so the machine draws no power in the moments when nobody is taking air.
15 % — no pressure you do not need
On the IT7000 you set exactly the pressure you need. Every extra bar costs consumption.
5 % — no transmission losses
The motor joins the airend directly through a tapered coupling. Against V-belts that removes the loss, the tensioning and the replacements.
3 % — efficient IE4 motors
Permanent magnets and oil cooling. Efficiency exceeds the requirements of class IE4 under IEC EN 60034.
What sets the range apart
IE4 permanent-magnet motor
Cooled by oil from the airend. Its efficiency exceeds the requirements of class IE4 under IEC EN 60034 — and because oil cools it, it needs neither its own fan nor a supply of clean air.
Tapered coupling to the airend
The motor joins the airend directly through a tapered coupling. That removes transmission losses, belt changes and tensioning, and bearing and coupling service.
INOVANCE inverter with vector control
Speed varies smoothly with demand, so the machine never idles. Vector control holds torque from as low as 0.1 Hz — ordinary inverters lose efficiency below 5 Hz.
IT7000 controller with a 7" display
A colour touch display in Czech and Slovak. It tracks machine status and service intervals and lets you schedule running for the week.
You can read the status from the door
The front panel lights up and shows by colour whether the compressor is making air right now, or is stopped or unloaded. You do not have to walk over to it.
What is inside
Inside sits an oil-lubricated airend of the maker’s own design running at low speed, joined by a tapered coupling straight to the permanent-magnet motor. Around it, the air and oil filters, the oil reservoir, the cooler with its fan, the controller and the inverter cabinet.
The bare Base machine measures 890 × 720 × 930 mm at 7.5 kW and 900 × 820 × 1,040 mm at 11 and 15 kW. The TD and FF packages stand on the receiver; FF is 126 mm wider than TD because it also carries the filters and the separator.
1 airend · 2 permanent-magnet motor · 3 air filter · 4 oil filter · 5 oil reservoir · 6 fan · 7 cooler · 8 controller · 9 inverter
Three equipment levels
Base — the bare machine
For plants that have the receiver and air treatment sorted separately or centrally. The smallest footprint in the range.
TD — the 4-in-1 package
Compressor, 270 or 500 l receiver, RDL refrigeration dryer and AAFM pre-filter on one frame. The pre-filter protects the dryer and lifts the air to class 2-4-2.
FF — the 8-in-1 package
Everything TD has, plus a micro-filter, an activated-carbon filter, zero-loss drains and the WOSM separator. The air exceeds class 1-4-1, oil below 0.005 mg/m³.
| What each package contains | ||
|---|---|---|
| Equipment | TD — 4-in-1 | FF — 8-in-1 |
| 270 or 500 l air receiver | yes | yes |
| RDL refrigeration dryer | yes | yes |
| AAFM pre-filter | yes | yes |
| AAFS micro-filter | — | yes |
| AAFA2 activated-carbon filter | — | yes |
| condensate drains | — | yes |
| WOSM water–oil separator | — | yes |
The compressor itself and its core technology stay the same across all versions. The higher packages add air treatment and automatic condensate handling step by step.
From the left: Base the bare machine · TD the 4-in-1 package · FF the 8-in-1 package with the separator, visible as an upright cylinder beside the tank.
Three-stage filtration on the FF version
AAFM pre-filter
It sits ahead of the dryer and protects it from oil and coarse dirt. It is in the TD package too — which is exactly why TD delivers class 2-4-2 air, something a compressor with only a dryer cannot manage.
AAFS micro-filter
It catches residual liquid oil and the remaining solid particles that pass the pre-filter and the dryer.
AAFA2 activated-carbon filter
The last stage, which removes oil mist and vapour. Only with it does the oil content fall below 0.005 mg/m³.
Which model to choose
| SCR-APM Maxi screw compressors (10 bar, inverter) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Model | Package | Control range | By volume | Motor power | Receiver | Outlet | Noise | Weight |
| SCR-7,5/10APM | Base | 600 – 950 l/min | 36.0 – 57.0 m³/h | 7.5 kW | — | 1/2" | 66 ± 3 dB(A) | 220 kg |
| SCR-11/10APM | Base | 800 – 1,500 l/min | 48.0 – 90.0 m³/h | 11 kW | — | 3/4" | 70 ± 3 dB(A) | 295 kg |
| SCR-15/10APM | Base | 1,000 – 2,000 l/min | 60.0 – 120.0 m³/h | 15 kW | — | 3/4" | 70 ± 3 dB(A) | 300 kg |
| SCR-7,5/10APM-270D | TD | 600 – 950 l/min | 36.0 – 57.0 m³/h | 7.5 kW | 270 l | 1/2" | 66 ± 3 dB(A) | 352 kg |
| SCR-11/10APM-270D | TD | 800 – 1,500 l/min | 48.0 – 90.0 m³/h | 11 kW | 270 l | 1" | 70 ± 3 dB(A) | 474 kg |
| SCR-11/10APM-500D | TD | 800 – 1,500 l/min | 48.0 – 90.0 m³/h | 11 kW | 500 l | 1" | 70 ± 3 dB(A) | 550 kg |
| SCR-15/10APM-270D | TD | 1,000 – 2,000 l/min | 60.0 – 120.0 m³/h | 15 kW | 270 l | 1" | 70 ± 3 dB(A) | 479 kg |
| SCR-15/10APM-500D | TD | 1,000 – 2,000 l/min | 60.0 – 120.0 m³/h | 15 kW | 500 l | 1" | 70 ± 3 dB(A) | 555 kg |
| SCR-7,5/10APM-270FF | FF | 600 – 950 l/min | 36.0 – 57.0 m³/h | 7.5 kW | 270 l | 1/2" | 66 ± 3 dB(A) | 359 kg |
| SCR-11/10APM-270FF | FF | 800 – 1,500 l/min | 48.0 – 90.0 m³/h | 11 kW | 270 l | 1" | 70 ± 3 dB(A) | 481 kg |
| SCR-11/10APM-500FF | FF | 800 – 1,500 l/min | 48.0 – 90.0 m³/h | 11 kW | 500 l | 1" | 70 ± 3 dB(A) | 557 kg |
| SCR-15/10APM-270FF | FF | 1,000 – 2,000 l/min | 60.0 – 120.0 m³/h | 15 kW | 270 l | 1" | 70 ± 3 dB(A) | 486 kg |
| SCR-15/10APM-500FF | FF | 1,000 – 2,000 l/min | 60.0 – 120.0 m³/h | 15 kW | 500 l | 1" | 70 ± 3 dB(A) | 562 kg |
All models: 10 bar, 400 V / 50 Hz, three-phase. The dryer and condensate drain run on 230 V / 50 Hz, single-phase; the dryer power draw (370 W on 7.5 kW, 460 W on 11 and 15 kW) is not included in the compressor figure. Noise is quoted at 1 m. FAD measured to ISO 1217 at the maximum pressure of the model.
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How idle running happens
A fixed-speed compressor runs in cycles. After starting it compresses air and the motor is on load. As soon as it reaches the pressure required, it switches to idle running — it no longer makes air, but the motor keeps turning the airend and consuming energy.
Idle running makes the next start easier, but it lasts tens of seconds and spends energy for nothing. The manufacturer states it is usually tens of percent of total consumption. And an awkward rule applies: the less air you draw, the larger the idle share — and that is exactly where the biggest saving is waiting.
What the IT7000 controller does
- colour touch display
- menu in Czech and Slovak
- 7" screen
- viewing and setting parameters
- weekly running schedule
- fault log
- automatic restart
Dryer and condensate
Both packages carry an RDL refrigeration dryer with the eco-friendly R513a refrigerant, holding a pressure dew point of +3 °C at reference conditions. The dryer has its own electronic controller with a segment display for operation and alarm signalling.
It runs on 230 V just like the condensate drain — and its power draw is not included in the compressor figure given in the table. Why compressed air is dried at all is covered in Why and how to dry compressed air.
What the electricity costs
| Annual electricity cost (CZK) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Motor power | 1,000 h/yr | 2,000 h/yr | 4,000 h/yr | ||||||
| 4 CZK/kWh | 5 CZK/kWh | 6 CZK/kWh | 4 CZK/kWh | 5 CZK/kWh | 6 CZK/kWh | 4 CZK/kWh | 5 CZK/kWh | 6 CZK/kWh | |
| 7.5 kW | 30,000 | 37,500 | 45,000 | 60,000 | 75,000 | 90,000 | 120,000 | 150,000 | 180,000 |
| 11 kW | 44,000 | 55,000 | 66,000 | 88,000 | 110,000 | 132,000 | 176,000 | 220,000 | 264,000 |
| 15 kW | 60,000 | 75,000 | 90,000 | 120,000 | 150,000 | 180,000 | 240,000 | 300,000 | 360,000 |
The table is taken from the manufacturer catalogue. It shows what electricity costs for a given motor power at a yearly running time and a price per kWh — that is, the size of the prize when consumption drops.
Service and maintenance
Cheaper upkeep
No V-belt replacement or tensioning, no cracked or leaking hoses, no main-motor bearing changes, no coupling or gearbox service. A direct drive has nothing to maintain.
Genuine parts and lubricants
To keep output up and failures away, only genuine fills and filters belong in the machine. You pick the part from the documentation or from the marking on it inside the machine.
Service network
Maintenance is covered by a wide network of service partners, so needless call-out costs disappear.
You do not have to buy — SCRent rental
You do not have to buy a new compressor. The SCRent programme lets you take the machine on a five-year long-term rental with monthly payments — in cooperation with Raiffeisenbank.
The monthly payment is not simply the price of the machine divided by sixty. It covers everything the five years of operation will bring. The only thing you pay separately is the electricity you use.
What the monthly payment covers
- the price of the chosen SCR screw compressor model
- the price of the chosen air treatment equipment
- scheduled maintenance for the whole rental term, with no cap on running hours
- breakdown service — all failure costs during the rental
- professional installation of all equipment
- transport of all equipment to the installation site
- pressure vessel inspections
- free environmental disposal of oils and filter elements
- insurance against damage and theft for the whole rental term
- operator training for correct running and basic maintenance
- discounts on equipment, spare parts and oils you buy
Where the range is used
Production plants and lines
Air as the backbone medium for machines and tools, drawn through the whole shift. The inverter holds the speed to real demand.
Paint shops and surface finishing
The FF version delivers air that exceeds class 1-4-1 — no solid particles and practically no oil.
Food and pharmaceuticals
The activated-carbon filter deals with oil vapour that a micro-filter alone will not catch.
Plants watching their consumption
On a 15 kW machine at 4,000 running hours the catalogue puts it in the hundreds of thousands of crowns a year.
Ventilek advises
At this size the saving is counted in hundreds of thousands, not thousands. A 15 kW machine in continuous duty burns up to CZK 360,000 a year on electricity according to the manufacturer catalogue. When the inverter takes the promised 35 % of idle running, that is more than a hundred thousand a year. The table below this paragraph is not ours — it is from the catalogue; hold it up against what you pay for electricity today.
Frequently asked questions
- How does Maxi differ from the smaller Mini range?
- Mainly in size: Maxi starts at 600 l/min where Mini tops out at 690. But the packages differ too — on Maxi, TD has a pre-filter as well (hence 4-in-1 and class 2-4-2) and FF has three-stage filtration including an activated-carbon filter. The dew point is +3 °C instead of +5 °C. Smaller machines are in the SCR-APM Mini range.
- What does APM mean in the designation?
- It stands for a permanent-magnet motor. The number after the dash is the motor power in kilowatts, the number after the slash the pressure in bar. The suffix -270D or -500D marks the TD package with a 270 or 500 litre receiver, -270FF and -500FF the top equipment level.
- What air does TD deliver, and what does FF?
- The TD package has the AAFM pre-filter ahead of the dryer and delivers class 2-4-2 air to ISO 8573-1. The FF package adds the AAFS micro-filter and the AAFA2 activated-carbon filter — the air then exceeds class 1-4-1 and oil content falls below 0.005 mg/m³. Condensate from FF holds under 20 ppm of oil.
- Why are there two figures for output?
- That is the inverter control range. The first figure is the minimum the machine will throttle down to at low demand, the second the maximum at peak. It is exactly this control that removes idle running, where fixed-speed machines burn electricity for nothing — the manufacturer counts 35 % of the saving from it.
- Which receiver should I pick, 270 or 500 litres?
- A bigger vessel damps swings in demand and the machine switches less often. We carry the 500 litre version for the 11 and 15 kW machines; at 7.5 kW the manufacturer offers only 270 l. The 500 l package is 421 mm longer. We also carry air receivers on their own for other machines.
- What about the dryer?
- The RDL dryer holds a pressure dew point of +3 °C and works with the eco-friendly R513a refrigerant. It has its own electronic controller with a segment display. It runs on 230 V and its power draw (370 W on the 7.5 kW, 460 W on the others) is not included in the compressor figure.
- Who makes SCR?
- Shanghai Screw Compressor Co., Ltd, founded in 2000. Manufacturing to ISO 9001, CE and UL certification, machine performance checked by SGS audits. The machines are exported to more than 80 countries. Since 2018 a joint venture has been running with the Japanese maker Anest Iwata. The TD and FF packages were designed and engineered in the Czech Republic and are assembled there too.
- What is the warranty?
- The standard warranty is two years, extendable to five years as a paid option. The extension is not capped by running hours, needs no service contract and no shortened maintenance intervals. The condition is the use of genuine lubricants and filters.
Bestsellers
Product sorting
List of products
The highest output in the range in the shorter package. Two thousand litres a minute, but only 1,517 mm long — for plants short of space in the compressor room.
The smallest and quietest machine in the range. It controls from 600 to 950 l/min at 66 dB(A) and takes up only 890 × 720 mm — four decibels less and a smaller footprint than...
The middle 4-in-1 package with a 270 litre receiver. A range of 800–1,500 l/min covers a plant with several draw-off points, and the air is class 2-4-2.
A 4-in-1 package with a 500 litre vessel. The same compressor as the 270 version but with nearly twice the air reserve — for plants with bursty demand.
The strongest 4-in-1 package with a 500 litre receiver. Compressor, vessel, refrigeration dryer and pre-filter on one frame — class 2-4-2 air without assembling components piece...
The smallest and quietest 4-in-1 package. Compressor, 270 l receiver, refrigeration dryer and pre-filter on one frame — a finished source of class 2-4-2 air at 66 dB(A).
The middle 8-in-1 package. To the 270 l receiver, dryer and pre-filter it adds a micro-filter, an activated-carbon filter and a condensate separator — the air exceeds class 1-4-1.
An 8-in-1 package with a 500 litre vessel. The cleanest air plus a large reserve — for plants that draw in bursts and cannot have oil in the air.
The highest output with the top equipment level in the shorter package. Two thousand litres a minute, air above class 1-4-1, and only 1,517 mm long.
The top of the range. Highest output, largest vessel and the fullest equipment — two thousand litres a minute, 500 l of reserve and air that exceeds class 1-4-1.
The smallest machine in the top equipment level. To the 4-in-1 package it adds a micro-filter, an activated-carbon filter, zero-loss drains and a separator — the air exceeds...
The middle bare machine of the range. It controls from 800 to 1,500 l/min and takes a footprint of 900 × 820 mm. For plants that handle the receiver and air treatment centrally.
The strongest bare machine in the range. Two thousand litres a minute at peak, yet the same cabinet as the 11 kW — five kilowatts more without asking for a centimetre of extra...