Comprag ADX Series User manual

OPERATING MANUAL
BEDIENUNGSANLEITUNG
Heatless adsorption
compressed air dryers
Kaltregenerierende Adsorp-
tionstrockner ADX Serie
ADX series
Version 1.0
Version 1.0
EN
DE
Seite. 22
Руководство по эксплуатации
и техническому обслуживанию
Версия 1.0
стр. 41
Осушитель адсорбционный
с холодной регенерацией
серии ADX
RU

© 2016 Comprag ®. All rights reserved.
No part of the text and /or diagram may be reprinted or used without the prior written permission of Comprag.
The manufacturer reserves the right to make changes to a product design in order to enhance its technological
and operational parameters without notifying the user.
The product type may considerably differ to that displayed in documents.

Contents Page
1. Safety guidelines 4
1.1 Symbols used in the instructions 4
1.2 General safety guidelines 4
1.3 Safety precautions for start-up 5
1.4 Safety precautions during operation 6
1.5 Safety precautions for maintenance and repair 7
2. Design and mechanism 8
2.1 Technical information. 8
2.2 Function 9
2.3 Functionality 10
2.4 Correction factors for calculating capacity 11
3. Start up 12
3.1 Lifting 12
3.2 Dimensions 12
3.3 Preparation of facility 13
3.4 Connection to the compressed airline 13
3.5 Pneumatic circuit diagram 14
3.6 Connection to power supply and electric circuit diagram 14
4. Usage 15
4.1 Control panel 15
4.2 Switching on/off of equipment 15
5. Adjustment and maintenance 16
5.1 Adjustment for specic operating conditions 16
5.2 In-service testing 17
5.3 Changing adsorbent 17
6. Fault handling 18
6.1 Possible faults. 18
7. Storage and disposal 19
7. 1 Storage 19
7. 2 Disposal 19
EN

4Version 1.0
1. Safety guidelines
1.1 Symbols used in the instructions.
Lethal hazard.
Warning.
Attention.
1.2 General safety guidelines.
Carefully familiarise yourself with the technical documentation,
operating instructions and safety guidelines. Most accidents as-
sociated with the use of compressor equipment occur as a result
of non-compliance with safety guidelines. Prevent hazards from
developing and adhere to the safety guidelines.
The manufacturer reserves the right to make changes to a prod-
uct’s design without notifying the user.
1. The operator must stringently adhere to safety guidelines provided for by these instruc-
tions and local legislation!
2. When choosing between these safety guidelines and the regulations provided for by local
legislation, those rules which provide for more stringent requirements shall apply.
3. Only trained maintenance personnel with the relevant level of professional training are
permitted to operate, service and repair Comprag equipment
4.Compressed air owing immediately from the compressor may contain oil and impurities
and is not suitable for breathing! Compressed air has to be puried to an air purity grade

5
COMPRAG Heatless adsorption compressed air dryers ADX Series
suitable for breathing, in accordance with the standards prescribed by local legislation.
5. Compressed air is an extremely hazardous energy source. Compressed air must not be
used for unintended purposes! Do not use it to clean clothing and footwear and never point
compressed air hoses at people and animals! When using air to clean equipment, take
extra caution and wear safety goggles!
6. All maintenance, repair, setup and installation work etc. must be performed while the
equipment is turned off, disconnected from the power source, with compressed-air hoses
disconnected from the equipment, and with the use of safety goggles! Ensure that equip-
ment is disconnected from the compressed air system and is not under pressure.
1.3 Safety precautions for start-up
The user is solely liable for injuries or damages which occur due
to non-compliance with safety guidelines during installation, ope-
rati- on or servicing, as well as unauthorised use of equipment!
1. Equipment must only be unloaded/loaded using the appropriate handling devices or
hoisters. Equipment must not be manually lifted or moved. Do not leave equipment sus-
pended. Use a helmet during unloading operations.
2. Arrange the equipment in a dry and clean facility which provides shelter from precipi- tation.
The facility must be well ventilated, and forced ventilation should be provided if necessary.
3. Worn, damaged or spoiled compressed-air hoses should not be used. Ensure that hoses
correspond to the equipment in terms of nominal diameter and working pressure.
4. When using several compressor stations in a system, each compressor must have a
manually operated valve for cutting off any of the compressors in the case of emergency.
5. Explosive and re-hazardous admixtures such as solvent vapours and carbon dust etc.
must not be released into the atmosphere.
6. Ensure unrestricted access to the compressed-air hose from the compressor. Do not
clutter it and do not store ammable materials in its immediate vicinity.
7. Do not pinch or deform the compressed-air feed hoses.
8. Do not cover holes used to provide equipment with air for cooling. Ensure the facility is
well ventilated.
9. When using remote control, the equipment must give a legible and clear warning of this:‘AT-
TENTION: this machine is being controlled remotely and may start operating without warning!’
An operator who is remotely controlling equipment must ensure that no installation or other
work is being performed with the equipment at that moment. Once the equip- ment is turned
off remotely, the operator must ensure that the equipment is actually turned off!

6Version 1.0
10. Equipment must be earthed. Provide short-circuit protection. The starting knife switch
must be in the immediate vicinity of the equipment and protect against unauthorised start-up.
The user bears full responsibility for compliance with the operating condi-
tions of the electrical motor installed in the equipment.
Equipment must be used with protection devices.
The protection devices must protect the electric motor from short circuits,
overloading (systematic and start-up) and open-phase conditions. Instal-
lation of protection devices is the responsibility of the user.
11. There must be an information plate afxed next to the control panel on equipment with
an independent control system featuring an automatic restart function: ‘ATTENTION: This
machine may start operating without warning!’
12. Any tanks and vessels working under pressure must be tted with safety-relief valves! Unau-
thorised installation, disassembly or adjustment of attached safety-relief valves is not allowed.
1.4 Safety precautions during operation.
The user is solely liable for injuries or damages which occur due
to non-compliance with safety guidelines during installation, op-
era- tion or servicing, as well as unauthorised use of equipment!
1. Ensure that hoses correspond to the equipment in terms of nominal diameter and working
pressure. Check the attachment of every hose coupling before start-up. An insecurely fas-
tened hose may cause serious injury.
2. Never turn on equipment if you suspect the presence of highly ammable impurities in the air!
3. The operator remotely controlling equipment must ensure that no installation or other work
is being performed with the equipment at that moment! An information plate must be afxed
to the equipment in relation to this: ‘ATTENTION: this machine is being controlled remotely
and may start operating without warning!’
4. An operator is not allowed to operate equipment if the operator is fatigued, in a state of
intoxication from alcohol, drugs or medicine that reduces the body’s reaction time.
5. The equipment must not be operated if parts of the casing have been removed. Doors or
panels may be opened for short durations for inspection and scheduled checks. It is advis-
able to wear hearing protection.
In some types of equipment, open doors or removal of panels
during operation may lead to overheating.

7
COMPRAG Heatless adsorption compressed air dryers ADX Series
6. Personnel in conditions or a facility where the sound pressure level reaches or exceeds
90 dB (A), must wear ear protectors.
7.If the air used for cooling equipment is used while the facility is being heated, undertake
measures for it to be ltered so that it is suitable for breathing.
8. Regularly check that:
• safety devices and attachments are in place;
• all hoses and pipes are in good condition and sealed;
• there are no leaks;
• brackets and structural components are tightened;
• all electrical cables and contacts are in good condition and safe to use;
• safety devices are fully functional and there is no contamination etc;
• all structural components are in working order, with no signs of wear and tear.
1.5 Safety precautions for maintenance and repair
The user is solely liable for injuries or damages which occur due
to non-compliance with safety guidelines during installation, ope-
ration or servicing, as well as unauthorised use of equipment!
1.
Only original spare parts and ancillary items may be used. Using spare parts from other manu-
factures may lead to unpredictable results and consequently accidents.
2. When performing installation and repair work, always wear goggles!
3. Before connecting or disconnecting equipment, disconnect it from the main pneumatic sys-
tem. Ensure that the hoses aren’t under pressure!
4. Before beginning installation or other work, ensure that equipment is not pressurised. Installa-
tion work must not be carried out on equipment under pressure.
5. All maintenance work should be carried out only when the temperature of all structural ele-
ments falls to room temperature.
6. Never use highly ammable solvents or carbon tetrachloride for cleaning structural elements.
When wiping, take precautions against the poisonous vapours of cleaning uids.
7. When carrying out installation and repair work, an information plate should be afxed
to the control panel to warn against unauthorised start-up. For example, “Do not turn on.
Personnel operating!”
8. The operator remotely controlling equipment must ensure that no installation or other work is
being performed with the equipment at that moment! An information plate must be afxed to the
equipment in relation to this: See 1.3.9.
9. Maintain cleanliness in the facility where the equipment is installed. Close open inlets and
outlets during installation with dry clothes or paper to prevent rubbish entering the equipment.
10. Welding or other similar operations must not be carried out in the immediate vicinity of the
equipment and vessels under pressure.
11. If there is any suspicion of overheating, combustion or other emergency, turn off the equip-
ment. Immediately disconnect it from the power supply. Do not open the doors of equipment until

8Version 1.0
the temperature falls to room temperature, in order to prevent burns or injury.
12. Naked ames must not be used as a light source for inspecting and checking equipment.
13. Never use caustic solvents, which may damage materials of the pneumatic system
14. After performing installation or other work, ensure that no instruments, rags or spare
parts have been left inside the equipment.
15. Pay particular attention to the safety-relief valves. Thoroughly inspect them and remove
any dust and dirt. They must not be allowed to suffer any loss in function under any circum-
stances. Remember that your safety depends on their functionality!
16. Before beginning work in normal mode after maintenance or repair work, check that the
working pressure, temperature and other characteristics are correctly set. Ensure that all
control devices are installed and functioning properly.
17. When replacing lters, separators etc., wipe away dust, dirt and oil residue from the area
where they are installed with a dry cloth.
18. Protect the motor, air lter, electrical components and control components etc. from com-
ing into contact with condensate. For instance, blow down with dry air.
19. Use protective gloves during installation and repair work in order to avoid burns and injury
(for instance, during oil change).
2.
Design and mechanism
Non-compliance with these instructions, use of non-original parts and
absence of a warranty service coupon may invalidate the warranty.
2.1 Technical information
The product features of COMPRAG heatless adsorption compressed air dryers are given
below:
Model ADX20 ADX30 ADX40 ADX50 ADX70
Product code 14400050 14400051 14400052 14400053 14400054
Air consumption*, (m3/min) 2.0 3.0 4.0 5.0 7.0
Maximum working pressure, bar 10
Max. temperature of compressed
air at inlet to air dryer, °C +55
Min./max. ambient temperature,
°C +5/+45
Dew point temperature, С -40

9
COMPRAG Heatless adsorption compressed air dryers ADX Series
Voltage, (phase/V/Hz) 1/220/50
Type of adsorbent Desiccant – activated alumina
Quantity of adsorbent, kg 30 45 60 75 105
Thread connection,
inlet / outlet G1’ G1 1/4’ G1 1/2’
Model ADX90 ADX125 ADX160 ADX200 ADX250
Product code 14400055 14400056 14400057 14400058 14400059
Air consumption*, (m3/min) 9.0 12.5 16 20 25
Maximum working pressure, bar 10
Max. temperature of compressed
air at inlet to air dryer, °C +55
Min./max. ambient temperature,
°C +5/+45
Dew point temperature, С -40
Voltage, (phase/V/Hz) 1/220/50
Type of adsorbent Desiccant - activated alumina
Quantity of adsorbent, kg 135 190 240 300 375
Thread connection,
inlet / outlet G1 1/2’ G2 1/2’ / G2’ G3’ / G2 1/2’
* See point 2.4
2.2 Function
The air dryer is designed to dry compressed air used for industrial purposes. The air
dryer should not be used in facilities where there are re or explosion hazards, or where
works are being carried out which involve the discharge of substances that pose re
safety hazards (solvents, ammable vapours, spirits etc.). In particular, the air dryer
should not be used for producing breathable air. Such use is allowed if compressed air
is puried to an air purity grade suitable for breathing, in accordance with the standards
prescribed by local legislation.
Equipment must only be used according to its designated purpose. It is considered
improper and unreasonable to use the equipment for other purposes. The manufacturer
bears no liability for any damage caused that is due to improper or unreasonable use of
equipment.

10 Version 1.0
2.3 Functionality.
Fig. 2.3 Flow chart of air dryer
Cyclogram for the opening and closing of electromagnetic pneumatic valves (PV) 5.
PV4 – solenoid valve of left tower
PV2 – solenoid valve of right tower
Both solenoid valves, PV2 and PV4, are closed during start-up.
Phase A. Solenoid valve PV2 is actuated and the pressure falls in tower 2 to atmospheric
pressure. Bypass valve 1 switches to closing tower 2 (as there is no pressure in this tower).
The inow of compressed air is fed into tower 4, where adsorbent material adsorbs the
moisture to the required set amount.
Some of the dry air passes through the injector 7 from tower 4 to tower 2, where it expands.
7
3
4
2
5
1 6
Air for drying
Dry compressed air
1. Bypass valve.
2. Right tower.
3. Check valve.
4. Left tower.
5. Solenoid valve (PV)
6. Silencer
7. Injector
15ñåê270ñåê 30ñåê
30ñåê240ñåê 60ñåê
270ñåê
240ñåê
30ñåê
60ñåê
PV4
De lay A B C D
PV2
ADX20- ADX90
ADX125 -ADX 250
15 sec 270sec 30 sec
30 sec 240sec 60 sec
270 sec
240 sec
30 sec
60 sec
PV4
De lay A B C D
PV2
ADX20-ADX90
ADX125 -ADX 250

11
COMPRAG Heatless adsorption compressed air dryers ADX Series
The (dried and expanded) inlet air passing through tower 2 dries the adsorbent material;
moisture is ejected into the atmosphere via solenoid valve PV2 and silencer 6. When the
phase is complete, the adsorbent in tower 2 is fully regenerated.
Phase B. Solenoid valve PV2 closes, and injector 7 is used to increase the pressure in
tower 2 to working pressure.
Phase C. Solenoid valve PV4 is actuated and the pressure falls in tower 4 to atmospheric
pressure. Bypass valve 1 switches to closing tower 4 (as there is no pressure in this tower).
The inow of compressed air is fed into tower 2, where adsorbent material adsorbs the
moisture to the required set amount.
Some of the dry air passes through the injector 7 from tower 2 to tower 4, where it expands.
The (dried and expanded) inlet air passing through tower 4 dries the adsorbent material.
Moisture is ejected into the atmosphere via solenoid valve PV2 and silencer 6. When the
phase is complete, the adsorbent in tower 4 is fully regenerated.
Phase D. Solenoid valve PV4 closes, and injector 7 is used to again increase the pressure
in tower 4 to working pressure.
2.4 Correction factors for calculating capacity.
All calculations in the design and manufacture of air dryers are given for nominal (standard)
conditions. According to ISO 7183, the conditions are as follows: working pressure 7 bar,
temperature of compressed air at inlet to air dryer +35°С. Therefore, when choosing an air
dryer, correction factors are used by factoring in any difference between the nominal and
actual conditions.
Working pressure, bar 4 5 6 78910
Factor F1 0.6 0.75 0.88 1.00 1.1 1.17 1.25
Correction factor according to temperature of compressed air at inlet
Temperature of compressed air at inlet, °С +25 +30 +35 +40 +45 +50
Factor F2 1.15 1.1 1.00 0.91 0.84 0.79
When these factors are used for the necessary air dryer calculation, we nd that the actual
capacity, P, is equal to: P = Pnominal / (F1 x F2)
When choosing an adsorption air dryer, always bear in mind that the
air consumption for regeneration is a minimum 15%.

12 Version 1.0
3. Start up
3.1 Lifting
Visually inspect for damages to packaging, and if there are no damages, then place the unit
near the site chosen for installation and unpack the unit. Equipment must only be moved
using the appropriate handling devices or hoisters.
Equipment must not be manually lifted or moved. Even when packaged, store the
equipment in a place shielded from weather conditions.
Handle with care. Heavy impacts (bumps and falls) may cause irreparable damage.
The presence of dents, chips and other damages may invalidate
the warranty.
3.2 Dimensions
The appearance of the air dryer is shown in gure 3.2.
Model
Air dryer
Height H,
mm
Width W,
(mm)
Depth D,
(mm)
Weight,
kg
ADX20 1220
800
600
90
ADX30 1500 111
ADX40 1850
800
175
ADX50 2130 205
ADX70 1820 955 250
ADX90 2120 310
ADX125 2335 1275
1000
496
ADX160 2325 1335 565
ADX200 2330 1435 720
ADX250 2645 805
Fig. 3.2 Air dryer dimensions.
D
H
W

13
COMPRAG Heatless adsorption compressed air dryers ADX Series
3.3 Preparation of facility.
Installing the dryer in unsuitable conditions may lead to dimin-
ished performance due to overload. Such instances are not
covered by warranty.
The minimum requirements for installation are as follows:
• Choose a clean, dry and dust-free facility which is shielded from the outdoors.
• The oor should be level, horizontal and support the weight of the dryer.
• The minimum ambient temperature is +5°C.
• The maximum ambient temperature is +45°C.
• There should be clearance provided on all sides of the dryer to allow access for carry-
ing out maintenance work.
No oor fastening is required for the dryer.
3.4 Connections to compressed air line
All work associated with connecting compressor equipment must be carried out with the
pneumatic system not under pressure.
Connecting to the compressed air line should only be carried out by a qualied specialist.
The temperature and amount of air entering the dryer must correspond to the values given
in table 2.1.
Exceeding the permitted pressure may lead to injury of the oper-
ator and damage to equipment. The user shall bear responsibility
for the consequences of exceeding pressure beyond the value
given on the dryer’s identication plate.
When using this item, the pneumatic system must be tted with a prelter for cleaning
the compressed air of oil (0.01 mg/m2 permitted oil content) and an outlet (dust) lter for
protecting from adsorbent dust.
Comprag AF-series lters are recommended for installation.
Please contact your dealer for help in choosing the right lter.
Using the adsorption air dryer without the specied lters may
cause the adsorbent to lose its functional characteristics or cause
blockage of the equipment that is consuming the compressed air.
The user must install lters. Claims are not covered by warranty
and are disregarded in cases where such lters are not used.
Dimensions and performance characteristics of hoses and valves must correspond to the
volume and pressure of supplied air. Underestimation may lead to depressurization of the
system and cause injury to the operator and equipment damage.

14 Version 1.0
3.5 Pneumatic circuit diagram
3.6 Connection to power supply and electric circuit diagram
Figure 3.6.1 displays an electrical schematic diagram for dryers.
Figure 3.6.1. Electrical schematic diagram
3
12
4
4
55
6
6
7
78
99
10
1 – Left tower.
2 – Right tower.
3 – Bypass valve.
4 – Solenoid valve.
5 – Silencer.
6 – Manometer.
7 – Safety valve.
8 – Injector.
9 – Check valve.
10 – Outlet valve
F2
YV3YV2
220V
X6
X7
X8
X9
X1
X2
X3
X4
X5
YV1
YV1
YV2
YV2
YV3
YV3
220V
F1
PE
NN
R
N
1) R - контроллер
2) YV2, YV3 - электромагнитные клапана
3) F1, F2 - предохранители

15
COMPRAG Heatless adsorption compressed air dryers ADX Series
Only qualied personnel should connect equipment to an electric power supply. Before con-
necting, ensure that the voltage and frequency in the power supply network correspond to the
values in table 2.1. The permissible voltage variation is ±10%.
4. Usage
4.1 Control panel
On/off – turning on/off of automatic tower switching.
Red indicator is lit – drying process occurring in tower.
Green indicator is lit – regeneration process occur-
ring in tower.
Screen displays time until cycle switch.
The dryer operates entirely in automatic mode as
far as the control panel is concerned and does not
require any adjustment.
4.2 Switching on/off of equipment
Ensure that the operating parameters correspond to the nominal
values given in table 2.1 (power frequency and voltage, pressure
and temperature of compressed air, ambient temperature etc.).
If the equipment is delivered in winter, keep the equipment at room temperature for no fewer
than eight hours after unpacking and before turning it on. This is to ensure that the compo-
nents are warm and avoids condensate forming.
Fig. 4.1. Control panel

16 Version 1.0
The rst start-up should be performed only by a qualied
specialist. The user is solely responsible for properly and safely
operating the equipment.
The air dryer is started by pressing the ON (button) (see gure 4.1). It is stopped by pressing
the OFF button.
When starting the dryer for the rst time upon delivery, the following procedures need to be
followed in order to reach the required dew point.
• Connect the dryer to the pneumatic system.
• Close the outlet valve.
• Turn on the dryer and wait no fewer than ~ 50 switching cycles of the towers.
The device is ready for operation.
Following a break in operating the dryer for more than twelve hours, it is advised that the
procedures described for turning on the dryer for the rst time be repeated. However, only two
switching cycles of the towers need to be waited.
The dryer must not be used when turned off. This will inevitably
diminish the desiccating properties of the adsorbent.
5. Adjustment and maintenance
5.1 Adjustment for specic operating conditions
In standard delivery, the dryer is supplied with an injector for operating in conditions with
an inlet temperature of +35°C and pressure (on manometer) of 8 bar. This also includes an
additional injector for 10-bar pressure.
For operating the dryer in other operating conditions or with a dif-
ferent dew point, additional injectors will need to be purchased.
This is to ensure accurate metering of the dried air ow.

17
COMPRAG Heatless adsorption compressed air dryers ADX Series
Fig. 5.1
In order to change the injector (1), unscrew the ttings (2). Ensure the connections are her-
metically tightened upon changing.
5.2 In-service testing
The switching of cycles and monometer readings should be monitored every day.
Once per month, the injector (8) and silencer (5), as given in gure 3.5, should be disas-
sembled for inspection and cleaned of oil and dust if necessary.
If these procedures aren’t carried out, then the dryer may fail to
operate properly, which will lead to noticeable deterioration in
the quality of air at the outlet of the dryer.
5.3 Checking drive belt
Deterioration of adsorbent can lead to reduced performance of
the air dryer. If you are unable to monitor the quality of dried air,
then you should change the adsorbent every 3 years.
Under standard conditions, for which the adsorption compressed air dryer is designed, the
adsorbent has a minimum service life of three years before it loses its moisture-adsorbing
properties.
The following steps should be carried out to change the dryer:
1
22

18 Version 1.0
• Ensure that the towers are not under pressure and disconnect the dryer from the
system.
• Unscrew the bleed plug.
• Fully remove the adsorbent from the towers.
• Screw on the bleed plug.
• Unscrew the lling plug.
• Fill both towers with original adsorbent, as per table 2.1
• Screw on the lling plug.
• Carry out the start-up procedure as for the rst start-up, as per point 4.2.
6. Fault handling
6.1 Possible faults
Fault Possible cause Solution
The air dryer
will not start.
There is no electrical voltage. The voltage of the power supply line, the state of
fuses and the main switch should be inspected.
Failure of electronic circuit board. Replace the electronic circuit board.
Purge air
doesn’t exit.
Failure of solenoid valve. Check for signals being output to solenoid valves.
Replace, if necessary.
Failure of electronic circuit board. Replace the electronic circuit board.
Injector / silencer blocked. Remove injector / silencer.
Purge with compressed air. Replace, if necessary.
Air ows out
in very small
amounts.
Injector / silencer blocked. Remove injector / silencer. Clean away dirt / oil
/ dust.
There is no
change in the
tower cycles.
Check the functioning of the sole-
noid valves.
Check for signals being output to solenoid valves.
Replace, if necessary.
There is no electrical voltage. The voltage of the power supply line, the state of
fuses and the main switch should be inspected.
Failure of electronic circuit board. Replace the electronic circuit board.
Mechanical problem in the intake
valve.
Remove the intake valve and check the free play
of the bypass washer.

19
COMPRAG Heatless adsorption compressed air dryers ADX Series
Presence of
condensate in
the pipeline.
The air feed is too high.
Check that the operating conditions conform
with requirements of the technical documenta-
tion.
Low air pressure at inlet.
High temperature of air at inlet.
There is no change in the tower
cycles.
Insufcient supply of purge air.
Pressure in tower during regenera-
tion mode (maximum permissible
pressure, Pmax., is 0.05 MPa).
Look at all aforementioned means of handling
faults.
Service life of adsorbent. Adsorbent replacement.
7. Storage and disposal
7.1 Storage of dryers
Dryers should be kept in a dry facility at a temperature between -10° and +45°С with max.
75% relative humidity. The facility should preclude the presence of precipitation.
7.2 Disposal
When dismantling the air dryer for disposal, it is advised that the components are divided
according to their constituent materials. You are advised to following safety instructions for
the recycling of each type of material.
Particular attention should be paid to recycling adsorbent.
Do not release adsorbent into the environment!
The adsorbent contains oil particles from the compressor.
Do not release adsorbent into the environment. Remove it from the air dryer, as per point
5.3, and dispose of it for recycling.

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