Refrigeration dryer RDL-235 – G 1 1/2", 3,917 l/min
Code: RDL-235
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Product detailed description
The RDL-235 refrigeration dryer dries compressed air to a pressure dew point of +5 °C, i.e. water class 5 according to ISO 8573-1. It handles 3,917 l/min (235 m³/h) at 7 bar, works up to 13 bar and is connected with a female thread G 1 1/2"; power supply 230 V, 50 Hz.
It belongs to the Omega Air RDL refrigeration dryer range with a three-stage aluminium heat exchanger, R513A refrigerant, a float condensate drain and a controller that displays the dew point.
Technical parameters
| Parameter | Value |
|---|---|
| Flow rate at 7 bar | 235 m³/h (3,917 l/min) |
| Maximum working pressure | 13 bar |
| Pressure dew point | +5 °C (water class 5 according to ISO 8573-1) |
| Connection | female thread G 1 1/2" |
| Power supply | 230 V, 50 Hz |
| Power input / consumption | 0.61 / 0.46 kW |
| Refrigerant | R513A |
| Cooling air | 700 m³/h |
| Heat rejection | 1.9 kW |
| Pressure drop | < 0.2 bar |
| Inlet air temperature | up to +55 °C |
| Room temperature | +1.5 to +45 °C |
| Condensate drain | AOK 13PA float drain |
| Communication | MODBUS, remote switch-on and switch-off, alarm output |
| Protection of the controller front | IP 65 |
| Dimensions A × B × C | 236 × 573 × 763 mm |
| Weight | 49 kg |
Dimensions
Dimensions according to the manufacturer: width A 236 mm, depth B 573 mm, height C 763 mm; weight 49 kg.
Flow rate under other conditions
The nominal flow rate of 3,917 l/min applies to +25 °C in the room, +35 °C at the inlet, 7 bar and a dew point of +5 °C. Under other conditions, multiply it by the manufacturer’s correction factors. For example, at 10 bar, an inlet of +40 °C and +30 °C in the room, the RDL-235 handles 3,917 × 1.14 × 0.83 × 0.96 = 3,558 l/min.
Pressure factor
| Pressure bar | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 13 |
|---|---|---|---|---|---|---|---|---|
| Correction factor | 0.77 | 0.86 | 0.93 | 1.00 | 1.05 | 1.14 | 1.21 | 1.24 |
Dew point factor
| Dew point °C | 3 | 5 | 7 | 10 |
|---|---|---|---|---|
| Correction factor | 0.90 | 1.00 | 1.10 | 1.26 |
Inlet air temperature factor
| Temperature °C | ≤ 25 | 30 | 35 | 40 | 45 | 50 | 55 |
|---|---|---|---|---|---|---|---|
| Correction factor | 1.20 | 1.12 | 1.00 | 0.83 | 0.69 | 0.59 | 0.50 |
Room temperature factor
| Temperature °C | ≤ 25 | 30 | 35 | 40 | 45 |
|---|---|---|---|---|---|
| Correction factor | 1.00 | 0.96 | 0.90 | 0.82 | 0.72 |
How it works
The air is cooled in a three-stage aluminium heat exchanger to a dew point of +5 °C, the water vapour condenses and the float drain discharges the water. The refrigerant compressor runs continuously and the heat is removed by a condenser cooled with room air.
Equipment
The AOK 13PA float condensate drain discharges water without electricity. The electronic controller displays the dew point and reports an alarm (high or low temperature, temperature sensor failure); the dryer is switched on with a button below it, communicates via MODBUS and can be switched on and off remotely.
R513A refrigerant
R513A refrigerant has zero ozone depletion potential and low global warming potential and has replaced the former R134a refrigerant.
Position in the system
The dryer goes downstream of the compressor and the air receiver. Install a 3 µm pre-filter upstream of it, for example from the basic compressed air filters; downstream, depending on the required purity, a fine pre-filter and a microfilter. For a dew point of +3 °C and pressures up to 16 bar there are RDS dryers, for a dew point below 0 °C desiccant dryers.
You will find other sizes among the RDL refrigeration dryers.
Additional parameters
| Category: | Compressed air dryers for compressors |
|---|---|
| Pressure: | 13 bar |
| Connecting: | 1 1/2" |
| Motor power: | 610 W |
| Mains voltage: | 230/50 V/Hz |
| Dimensions: | 236 × 573 × 763 mm |
| Weight: | 49 kg |
| Condensate discharge: | Automatic |
| Flow: | 3,917 l/min |
| ISO class: | x/5/x - ISO 8573.1 |
| Equipment: | Control unit LED display, Alarm for remote management, Float condensate drain |
| Refrigerant: | Refrigerant R513A |
| Pressure dew point: | +5 °C |
| Dryer type: | Condensation dryer |
Product rating
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Omega Air is a Slovenian manufacturer of compressed air treatment equipment based in Ljubljana. Founded in 1988, the company now has 370 employees and exports to more than 80 countries. It has its own development team and patents and carries out almost all production in its own facilities.
We mainly offer industrial filters up to 420 bar with replacement elements, stainless steel process and sterile filters, refrigeration, desiccant and membrane dryers, activated carbon columns, oil-water separators and condensate drains. They are used in workshops and large plants, in food, pharmaceuticals, chemicals and paint shops.
Slovenian manufacturerOmega Air filters, dryers and separators
Industrial filters up to 50 bar
Filters for standard air lines. AAF and BF ranges up to 16 bar, BFHP up to 25 bar and HF up to 50 bar. The element sets the filtration grade.
- from coarse filter to activated carbon
- G 1/8" to 3" thread or DN80 to DN300 flanges
- AAFHT for hot air up to +120 °C
CHP and IHP high-pressure filters
For 100, 250 and 420 bar. CHP housings are nickel-plated carbon steel, IHP housings stainless steel.
- 8 sizes with G 1/4" to 2" thread
- flow 667 to 11,917 l/min at 7 bar
- six grades up to activated carbon
Stainless steel process filters
1.4404 stainless steel for food and pharma. Six ranges up to 14 and 50 bar with thread, flanges or welding ends.
- 12 filtration grades in each range
- sterile element in the PF and HPF ranges
- flow 1,250 to 352,000 l/min at 7 bar
RDS refrigeration dryers
Dew point +3 °C for most plants. The air cools down in the dryer, water condenses and the drain removes it without losing air.
- 18 sizes, 333 to 31,667 l/min
- working pressure up to 16 bar
- controller shows the dew point
ADRY desiccant dryers
Very dry air, dew point −40 °C. Moisture is captured by desiccant in two alternating columns.
- 9 sizes, 6 to 200 Nm³/h
- dew point −25 or −70 °C on request
- inlet and outlet filter included
MADRY membrane dryers
They dry without electricity. Water vapour passes through the wall of hollow fibres, dry air stays inside.
- 12 sizes, 50 to 3,000 l/min
- dew point down to −40 °C, up to 12 bar
- fine pre-filter and microfilter included
TAC activated carbon columns
They capture oil vapours that filters let through. The air flows through a bed of granular activated carbon.
- outlet oil below 0.003 mg/m³
- 19 sizes, 6 to 1,200 Nm³/h
- up to 16 bar, high-pressure TACHP up to 420 bar
WOS oil-water separators
They separate oil from condensate. Oil stays in the polypropylene fibre and activated carbon fills, water flows out.
- residual oil below 10 ppm
- 4 sizes for compressors up to 35.5 m³/min
- fills are replaced once a year
Not sure which filtration grades you need? The calculator in industrial filtration puts them together by application, pressure and flow, including condensate drainage.
Filtration calculatorOmega Air range side by side
| Group, series, rating and use | |||
|---|---|---|---|
| Group | Series | Rating | Use |
| Industrial filters | AAF, AAFHT, BF, BFHP, HF | up to 16, 25 and 50 bar | compressed air lines, hot air up to +120 °C |
| High-pressure filters | CHP, IHP | 100, 250 and 420 bar | high-pressure lines |
| Stainless steel process filters | PF, HPF, WFIT, WFIF, WFIW, WHFIT | up to 14 and 50 bar | food, pharmaceuticals, chemicals |
| Sterile filters | SF, SPF | up to 10 and 14 bar | sterile air, they also retain bacteria |
| Filters for special applications | AAFS, PPA, B-AIR, AAFO2, HFO2, P-VAC, M-VAC | up to 16 and 50 bar, vacuum from 20 mbar | paint shops, breathing air, oxygen, vacuum pumps |
| Cyclone separators | AAFC, HFC, CHP, IHP, CS, SFH | up to 16, 50 and 420 bar | liquid water and oil right after the compressor |
| Refrigeration dryers | RDS, RDL | up to 16 and 13 bar | dew point +3 and +5 °C |
| Desiccant dryers | ADRY, B-DRY, F-DRY | 4 to 16 bar | dew point −40 °C, −25 or −70 °C on request |
| Membrane dryers | MADRY | up to 12 bar | dew point down to −40 °C without electricity |
| Activated carbon columns | TACM, TAC, TACF, TACHP | up to 16 bar, TACHP up to 420 bar | oil vapours, oil below 0.003 mg/m³ |
| Oil-water separators | WOS, WOSM | compressors up to 35.5 m³/min | oil from condensate below 10 and 20 ppm |
| Condensate drains | MCD, AOK, TD, AD20 | up to 420 bar | manual, float, timed and electronic |
The manufacturer states filter and dryer flows at 7 bar. All sizes and grades are on the page of each group.
How to put compressed air treatment together
1. Define the quality
Choose the ISO 8573-1 purity class for the application: three numbers for solid particles, water and oil. A workshop needs 3:4:4, painting 1:4:1 and food in direct contact 1:2:1.
2. Order the grades
A separator or basic filter goes right after the compressor, followed by the dryer and the finer grades. Always place the 0.1 µm fine pre-filter before the 0.01 µm microfilter and activated carbon only after the microfilter.
3. Choose the size
Select the filter and dryer by compressor flow and line pressure. Flows are given at 7 bar; at lower pressure a filter passes less air.
4. Maintain
Replace elements once a year, sooner if the pressure drop rises. Remove condensate with a drain and replace the WOS separator fills once a year.
Frequently asked questions
- What is the difference between a fine pre-filter and a microfilter?
- A fine pre-filter captures particles down to 0.1 µm and oil to 0.1 mg/m³, a microfilter down to 0.01 µm and 0.01 mg/m³. The pre-filter always goes before the microfilter to protect its element.
- How do I find a replacement element for an Omega Air filter?
- The element has the same code as the filter with the letter V at the end: the AAFP-78 filter takes the AAFP-78V element. Most elements are replaced once a year, sooner if the indicator shows a higher pressure drop.
- Which Omega Air dryer should I choose?
- For workshops and most plants an RDS refrigeration dryer with a +3 °C dew point is enough. Very dry air or lines exposed to frost need an ADRY desiccant dryer with a −40 °C dew point. The MADRY membrane dryer needs no electricity and suits small flows right at the machine.
- Where does an activated carbon column go?
- After the dryer and a 0.01 µm microfilter, which captures oil droplets and aerosol. The column then removes oil vapours below 0.003 mg/m³. A 1 µm dust filter goes after it to catch dust from the carbon.
- What is an oil-water separator for?
- Condensate from an oil-lubricated compressor contains oil and must not go into the sewer untreated. The WOS separator captures the oil in its fills and water flows out with less than 10 ppm residual oil. The discharge limit is set by the local sewer regulations.
- Which condensate drains does Omega Air make?
- Manual MCD drains, float AOK drains that work without electricity, timed TD drains up to 420 bar and the electronic AD20. It senses the level with a capacitive sensor and drains condensate without losing air.
Most Omega Air product pages have a technical data sheet or drawing to download; AAF filters and ADRY and MADRY dryers also come with a manual in Czech. Omega Air is a brand of the Slovenian company OMEGA AIR d.o.o. Ljubljana.
| Manufacturing company : | OMEGA AIR d.o.o. Ljubljana |
|---|---|
| Address : | Cesta Dolomitskega odreda 10, 1000 Ljubljana, Slovenia |
| E-mail : | info@omega-air.si |