INSTRUCTION BOOK
REFRIGERANT COMPRESSED AIR DRYERS
FX 1, FX 2, FX 3, FX 4, FX 5, FX 6, FX 7
Atlas Copco
Refrigerant compressed air dryers
FX 1, FX 2, FX 3, FX 4, FX 5, FX 6, FX 7
From following serial No. onwards: ITJ 169 435
Instruction book
Original instructions
COPYRIGHT NOTICE
Any unauthorized use or copying of the contents or any part thereof is prohibited.
This applies in particular to trademarks, model denominations, part numbers and
drawings.
This instruction book is valid for CE as well as non-CE labelled machines. It meets the
requirements for instructions specified by the applicable European directives as
identified in the Declaration of Conformity.
2018 - 10
No. 2920 7112 41
www.atlascopco.com
Table of contents
1 Safety precautions..........................................................................................................4
1.1 SAFETY ICONS...................................................................................................................................4
1.2 SAFETY PRECAUTIONS, GENERAL...........................................................................................................4
1.3 SAFETY PRECAUTIONS DURING INSTALLATION...........................................................................................5
1.4 SAFETY PRECAUTIONS DURING OPERATION..............................................................................................6
1.5 SAFETY PRECAUTIONS DURING MAINTENANCE OR REPAIR...........................................................................7
1.6 DISMANTLING AND DISPOSAL.................................................................................................................8
2 General description......................................................................................................10
2.1 INTRODUCTION.................................................................................................................................10
2.2 AIR SYSTEM....................................................................................................................................12
2.3 REFRIGERATION SYSTEM....................................................................................................................13
2.4 AUTOMATIC REGULATION SYSTEM........................................................................................................13
2.5 ELECTRICAL SYSTEM.........................................................................................................................14
3 Installation.....................................................................................................................15
3.1 DIMENSION DRAWINGS.......................................................................................................................15
3.2 INSTALLATION PROPOSAL...................................................................................................................15
3.3 PICTOGRAPHS.................................................................................................................................18
4 Operating instructions.................................................................................................19
4.1 WARNINGS......................................................................................................................................19
4.2 DRYER CONTROL PANEL ...................................................................................................................19
4.3 DIGITAL DRYER CONTROLLER..............................................................................................................20
4.4 STARTING.......................................................................................................................................26
4.5 DURING OPERATION..........................................................................................................................27
4.6 STOPPING.......................................................................................................................................27
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5 Maintenance instructions............................................................................................ 29
6 Device settings............................................................................................................. 31
7 Problem solving............................................................................................................32
8 Technical data...............................................................................................................35
8.1 REFERENCE CONDITIONS AND LIMITATIONS............................................................................................35
8.2 AIR DRYER DATA..............................................................................................................................36
9 Pressure equipment directives................................................................................... 40
10 Declaration of conformity............................................................................................41
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1 Safety precautions
1.1 Safety icons
Explanation
Danger to life
Warning
Important note
1.2 Safety precautions, general
General precautions
All responsibility for any damage or injury resulting from neglecting these precautions, or
non-observance of the normal caution and care required for installation, operation,
maintenance and repair, even if not expressly stated, will be disclaimed by the
manufacturer.
1. The dryers are designed for normal indoor use.
2. The operator must employ safe working practices and observe all related work safety
requirements and regulations.
3. If any of the following statements does not comply with the applicable legislation, the stricter
of the two shall apply.
4. Installation, operation, maintenance and repair work must only be performed by authorized,
trained, specialized personnel.
5. The dryer is not considered capable of producing air of breathing quality. To obtain air of
breathing quality, the compressed air must be adequately purified according to the
applicable legislation and standards.
6. Before any maintenance, repair work, adjustment or any other non-routine checks, stop the
dryer, press the emergency stop button, switch off the voltage and depressurize the dryer. In
addition, the power isolating switch must be opened and locked. For plug versions, remove
the plug from the wall socket and secure it.
7. Never play with compressed air. Do not apply the air to your skin or direct an air stream at
people. Never use the air to clean dirt from your clothes. When using the air to clean
equipment, do so with extreme caution and wear eye protection.
8. The owner is responsible for maintaining the dryer in safe operating condition. Parts and
accessories shall be replaced if unsuitable for safe operation.
9. It is not allowed to walk or stand on the dryer or its components.
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1.3 Safety precautions during installation
Precautions during installation
1. The dryer must only be lifted using suitable equipment and in accordance with the applicable
safety regulations. Loose or pivoting parts must be securely fastened before lifting. It is
strictly forbidden to dwell or stay in the risk zone under a lifted load. Lifting acceleration and
deceleration must be kept within safe limits. Wear a safety helmet when working in the area
of overhead or lifting equipment.
2. Place the dryer where the ambient air is as cool and clean as possible. If necessary, install a
suction duct. Never obstruct the air inlet. Care must be taken to minimize the entry of
moisture at the inlet air.
3. Any blanking flanges, plugs, caps or desiccant bags must be removed before connecting the
pipes.
4. Air hoses must be of correct size and suitable for the working pressure. Never use frayed,
damaged or worn hoses. Distribution pipes and connections must be of the correct size and
suitable for the working pressure.
5. The aspirated air must be free of flammable fumes, vapours and particles, e.g. paint
solvents, that can lead to internal fire or explosion.
6. Arrange the air intake so that loose clothing worn by people cannot be sucked in.
7. Ensure that all piping is free to expand under heat and that it is not in contact with or close to
flammable materials.
8. No external force may be exerted on the air outlet valve. The connected pipe must be free of
strain.
9. If remote control is installed, the machine must bear a clear sign stating "Danger: This
machine is remotely controlled and may start without warning".
The operator has to make sure that the machine is stopped and that the isolating switch is
open and locked before any maintenance or repair. As a further safeguard, persons
switching on remotely controlled machines shall take adequate precautions to ensure that
there is no one checking or working on the machine. To this end, a suitable notice shall be
affixed to the starting equipment.
10. Air-cooled machines must be installed in such a way that an adequate flow of cooling air is
available and that the exhausted cooling air does not recirculate to the inlet.
11. The electrical connections must correspond to the applicable codes. The machines must be
earthed and protected against short circuits by fuses in all phases. A lockable power
isolating switch must be installed near the equipment.
12. On machines with automatic start-stop system or if the automatic restart function after
voltage failure is activated, a sign stating "This machine may start without warning" must be
affixed near the instrument panel.
13. Never remove or tamper with the safety devices, guards or insulation fitted on the machine.
Every pressure vessel or auxiliary installed outside the machine to contain air above
atmospheric pressure must be protected by a pressure-relieving device or devices as
required.
14. Piping or other parts with a temperature in excess of 80?C (176?F) and which may be
accidentally touched by personnel during normal operation must be guarded or insulated.
Other high-temperature piping must be clearly marked.
15. For water-cooled machines, the cooling water system installed outside the machine has to
be protected by a safety device with set pressure according to the maximum cooling water
inlet pressure.
16. If no safety valve is present in the air net close to the desiccant dryer (e.g. safety valve of
compressor), full flow safety valves must be installed on the dryer vessels.
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17. If the maximum pressure of the compressor is higher than the design pressure of the dryer,
a full flow safety valve must be installed between the compressor and the dryer in order to
blow off the excessive pressure in case the safety valve of the dryer should be out of order
or blocked.
18. When unit is not permanently secured to the floor in the vertical position or mounted
horizontally, access to electrical equipment is feasible through the unit base. In this case
additional barriers must be provided during installation. Tag with "warning high voltage"
symbol
19. For wall fixation and mounting use M8 hexagonal galvanized steel screws according to
UNI5740-DIN961-UNI_EN_ISO8676 or equivalent for extra-EU countries, with a minimum
resistance class of 5,6. This suggestion is valid only to keep on standing the dryer weight.
The manufactures declines any responsibility of improper screw selection or improper
characteristic of the wall where the dryer has to be fixed.
Also consult following safety precautions: Safety precautions during operation and Safety
precautions during maintenance or repair.
These precautions apply to machinery processing or consuming air or inert gas. Processing
of any other gas requires additional safety precautions typical to the application which are
not included herein.
Some precautions are general and cover several machine types and equipment; hence
some statements may not apply to your machine.
1.4 Safety precautions during operation
Precautions during operation
1. Always be careful when touching any piping or components of the dryer during operation.
On dryers using heat to regenerate the desiccant, some parts will become very hot.
2. Use only the correct type and size of hose end fittings and connections. When blowing
through a hose or air line, ensure that the open end is held securely. A free end will whip
and may cause injury. Make sure that a hose is fully depressurized before disconnecting it.
3. Persons switching on remotely controlled machines shall take adequate precautions to
ensure that there is no one checking or working on the machine. To this end, a suitable
notice shall be affixed to the remote start equipment.
4. Never operate the machine when there is a possibility of taking in flammable or toxic fumes,
vapors or particles.
5. Never operate the machine below or in excess of its limit ratings.
6. Keep all bodywork closed during operation. Bodywork should be opened for short periods
only, e.g. to carry out routine checks. Wear ear protectors when removing a panel.
7. People staying in environments or rooms where the sound pressure level reaches or
exceeds 90 dB(A) shall wear ear protectors.
8. Periodically check that:
? All guards are in place and securely fastened
? All hoses and/or pipes inside the machine are in good condition, secure and not
rubbing
? There are no leaks
? All fasteners are tight
? All electrical leads are secure and in good order
? Safety valves and other pressure relief devices are not obstructed by dirt or paint
? Air outlet valve and air net, i.e. pipes, couplings, manifolds, valves, hoses, etc. are in
good condition, free of wear or abuse
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9. If warm cooling air from dryers is used in air heating systems, e.g. to warm up a working
area, take precautions against air pollution and possible contamination of the breathing air.
10. Do not remove any of, or tamper with, the sound dampening material.
11. Never remove or tamper with the safety devices, guards or insulations fitted on the machine.
Every pressure vessel or auxiliary installed outside the machine to contain air above
atmospheric pressure shall be protected by a pressure relieving device or devices as
required.
12. Yearly inspect the air receiver. Minimum wall thickness as specified in the instruction book
must be respected. Local regulations remain applicable if they are more strict.
Also consult following safety precautions: Safety precautions during installation and Safety
precautions during maintenance or repair.
These precautions apply to machinery processing or consuming air or inert gas. Processing
of any other gas requires additional safety precautions typical to the application which are
not included herein.
Some precautions are general and cover several machine types and equipment; hence
some statements may not apply to your machine.
1.5 Safety precautions during maintenance or repair
Precautions during maintenance or repair
1. Always use the correct safety equipment (such as safety glasses, gloves, safety shoes,
etc.).
2. Use only the correct tools for maintenance and repair work.
3. Use only genuine spare parts.
4. All maintenance work shall only be undertaken when the machine has cooled down.
5. A warning sign bearing a legend such as "Work in progress - do not start" shall be attached
to the starting equipment.
6. Persons switching on remotely controlled machines shall take adequate precautions to
ensure that there is no one checking or working on the machine. To this end, a suitable
notice shall be affixed to the remote starting equipment.
7. Close the dryer air outlet valve before connecting or disconnecting a pipe.
8. Before removing any pressurized component, effectively isolate the machine from all
sources of pressure and relieve the entire system of pressure.
9. Never use flammable solvents or carbon tetrachloride for cleaning parts. Take safety
precautions against toxic vapours of cleaning liquids.
10. Scrupulously observe cleanliness during maintenance and repair. Keep dirt away by
covering the parts and exposed openings with a clean cloth, paper or tape.
11. Never weld on, or in any way modify, pressure vessels.
12. Whenever there is an indication or any suspicion that an internal part of a machine is
overheated, the machine shall be stopped but no inspection covers shall be opened before
sufficient cooling time has elapsed; this to avoid the risk of spontaneous ignition of the oil
vapor when air is admitted.
13. Never use a light source with open flame for inspecting the interior of a machine, pressure
vessel, etc.
14. Make sure that no tools, loose parts or rags are left in or on the machine.
15. All regulating and safety devices shall be maintained with due care to ensure that they
function properly. They may not be put out of action.
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16. Before clearing the machine for use after maintenance or overhaul, check that operating
pressures, temperatures and time settings are correct. Check that all control and shut-down
devices are fitted and that they function correctly.
17. Protect the motor, electrical and regulating components, etc. to prevent moisture from
entering them, e.g. when steam-cleaning.
18. Make sure that all sound-damping material and vibration dampers, e.g. damping material on
the bodywork, is in good condition. If damaged, replace it by genuine material from the
manufacturer to prevent the sound pressure level from increasing.
19. Never use caustic solvents which can damage materials of the air net, e.g. polycarbonate
bowls.
20. The following safety precautions are stressed when handling refrigerant:
? Never inhale refrigerant vapours. Check that the working area is adequately ventilated;
if required, use breathing protection.
? Always wear special gloves. In case of refrigerant contact with the skin, rinse the skin
with water. If liquid refrigerant contacts the skin through clothing, never tear off or
remove the latter; flush abundantly with fresh water over the clothing until all refrigerant
is flushed away; then seek medical first aid.
21. The following safety precautions are stressed when handling desiccant:
? Take precautions not to inhale desiccant dust.
? Check that the working area is adequately ventilated; if required, use breathing
protection.
? Do not overfill the dryer when replacing desiccant.
Also consult following safety precautions: Safety precautions during installation and Safety
precautions during operation.
These precautions apply to machinery processing or consuming air or inert gas. Processing
of any other gas requires additional safety precautions typical to the application which are
not included herein.
Some precautions are general and cover several machine types and equipment; hence
some statements may not apply to your machine.
1.6 Dismantling and disposal
Dismantling
Once the end of life of the machine is reached, please follow next steps:
1. Stop the machine.
2. Check all safety precautions mentioned in the previous chapters to secure safe handling
(e.g. LOTO, cool-down, depressurize, discharge, ...).
3. Separate the harmful from the safe components (e.g. drain oil from oil containing parts).
4. Refer to the disposal topic mentioned below.
Disposal of electrical and electronic appliances (WEEE)
This equipment falls under the provisions of the European Directive 2012/19/EU on waste
electrical and electronic appliances (WEEE) and may not be disposed as unsorted waste.
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The equipment is labelled in accordance with the European Directive 2012/19/EU with the
crossed-out wheelie bin symbol.
At the end of life-time of the electric and electronic equipment (EEE) it must be taken to separate
collection.
For more information check with your local waste authority, customer center or distributor.
Disposal of other used material
Used filters or any other used material (e.g. desiccant, lubricants, cleaning rags, machine parts,
etc.) must be disposed of in an environmentally friendly and safe manner, and in line with the
local recommendations and environmental legislation.
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2 General description
2.1 Introduction
General views
FX 1 up to FX 5
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10 2920 7112 41
FX 6 up to FX 7
Introduction
The FX air dryers remove moisture from compressed air by cooling the air to near freezing point.
This causes water to condense. The condensate is automatically drained. The air is warmed up
before leaving the dryer.
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2.2 Air system
Air flow diagram
Reference Name
4 Evaporator
5 Condensate separator
6 Impurity trap
10 Heat exchanger
11 Digital controller
13 Condensate drain
Description
Compressed air enters heat exchanger (10) and is cooled by the outgoing, cold, dried air. Water
in the incoming air starts to condense. The air then flows through heat exchanger/evaporator (10
and 4) where the refrigerant evaporates, causing the air to be cooled further to close to the
evaporating temperature of the refrigerant. More water in the air condenses. The cold air then
flows through separator (5) where all the condensate is separated from the air. The condensate
is automatically drained in the condensate drain.
The cold, dried air flows through heat exchanger (10) where it is warmed up by the incoming air
to approximately 10?C (18?F) below the incoming air temperature.
Condensation in the air net cannot occur unless the air is cooled to below the pressure dewpoint,
indicated by the digital controller (11).
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2.3 Refrigeration system
Refrigerant flow diagram
Reference Name
1 Refrigerant compressor
2 Condenser
4 Evaporator
7 Expansion capillary tube
8 Refrigerant filter
Description
Compressor (1) delivers hot, high-pressure refrigerant gas which flows through condenser (2)
where most of the refrigerant condenses.
The liquid flows through the refrigerant dryer/filter (8) to capillary tube (7). The refrigerant leaves
the capillary tube at evaporating pressure.
The refrigerant enters evaporator (4) where it withdraws heat from the compressed air by further
evaporation at constant pressure. The heated refrigerant leaves the evaporator and flows through
the liquid separator (9) back to the compressor (1).
2.4 Automatic regulation system
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Reference Name
3 Cooling fan
9 Hot gas bypass valve
Description
The condenser pressure must be kept as constant as possible to obtain stable operation. Fan
control switch therefore stops and starts the cooling fan (3).
If, under partial or no load, the evaporator pressure drops below a certain level, the hot gas
bypass valve opens and hot, high-pressure gas is fed to the evaporator circuit to prevent the
evaporator pressure from dropping any further.
2.5 Electrical system
Description
The fan control switch starts the fan motor as soon as the condenser pressure reaches the upper
set point of the switch and will stop the fan motor when the condenser pressure decreases to its
lower set point.
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3 Installation
3.1 Dimension drawings
The dimension drawings can be found on the CD-ROM, delivered with the dryer.
Dimension drawing Model
2202 7549 00 FX 1 up to FX 5
2202 7463 00
9828 0837 37
FX 6 (up to ITJ 171 402) and FX 7 (up to ITJ 169 435)
FX 6 (from ITJ 171 402) and FX 7 (from ITJ 169 435)
Text on drawings Translation or explanation
Electric cable outlet Outlet for electric cable
Condensate pipe drain outlet Outlet for condensate drain hose or pipe
Air inlet Air inlet
Air outlet Air outlet
Air flow Air flow direction
Bushings UL version only Bushings (UL certification version only)
Female Female connection
Male Male connection
All dimensions: mm / inch All dimensions are in mm or inch as indicated on the
drawing
3.2 Installation proposal
Moving
Use a suitable tool (pallet carrier, fork lift truck) to move the dryer.
Do not use metal cables for lifting.
Move the dryer gently.
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2920 7112 41 15
Example of compressor/dryer room
Installation proposal for FX 1 up to FX 5
Installation proposal for FX 6 up to FX 7
Attention
The disconnector switch (1) and the fuses are not supplied with the machine.
Reference Description
- Install the refrigerant air dryer on a level floor, suitable for its weight.
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Reference Description
- Install the dryer where the ambient air is as clean as possible and where the
temperature of the air will never exceed the limits. See Reference conditions and
limitations. Keep the ventilation gratings of the dryer free.
The recommended minimum distance between the top of the unit and the ceiling is 1.5
m (58.5 in).
The minimum distance between the wall and the back of the dryer must be 1.5 m (58.5
in).
Lay out the condensate drain hose via a funnel towards a drain collector to allow visual
inspection. The hose must slope downwards.
If the condensate drain has been fitted outside the dryer room where it may be exposed
to freezing temperatures, it must be insulated.
- The power cable must be connected by a qualified electrician.
Connect the dryer to the correct voltage; if necessary, check the unit data plate.
Check that the electrical installation corresponds to local codes. The dryer must be
earthed and protected against short circuits using an automatic cut-out device with a
differential device.
An isolating switch must be installed near the dryer.
- Connect the compressed air lines to the marked inlet and outlet pipes of the dryer (see
Dimension drawings). Provide an air inlet valve and outlet valve. If a bypass pipe and
valve are installed, the dryer can be serviced while it is bypassed.
1 Location of isolating switch and fuses.
2 Minimum distance 1.5 m (58.5 in).
? Please keep environmental conditions stable (temperature and humidity) in order to avoid
refrigerant compressor/fan overload and/or reduction of dryer performance.
Similar failures shall affect warranty reimbursements.
? Please ensure the appropriate composition of the air within the machine room:
? Clean with no damaging contaminants. (e.g. dust, fibres, fine sand)
? Free of explosive or chemically unstable gases or vapors.
? Free of acid/alkaline forming substances, particularly ammonia, chlorine or hydrogen
sulfide.
Similar failures shall affect warranty reimbursements.
? Please remember that we do not recommend the application of duct to extract air in
presence of axial fans.
? All refrigerant dryers shall be equipped with proper pre-filters as close as possible to the
dryer air inlet. The filters should be replaced once a year according to the service plan or
sooner in high humidity ambient conditions.
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3.3 Pictographs
Pictographs
Reference Name
1 Warning, under tension
2 Warning, air not fit for breathing
3 Warning, high pressure
4 Warning, rotating fan
5 Warning, hot surface
6 Switch off the voltage and depressurize the dryer before maintenance or repair
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4 Operating instructions
4.1 Warnings
Safety precautions
The operator must apply all relevant safety precautions, including those mentioned in this
manual.
Altitude operation
Consult your supplier if operating above 3000 m (9843 ft).
4.2 Dryer control panel
Description
FX 1 up to FX 7
Reference Name
1 Digital controller, used for:
1. pressure dewpoint indication (main function)
2. alarms information
3. maintenance interval scheduling
2 Dryer on/off switch
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4.3 Digital dryer controller
Identification
Front panel of the controller
Reference Name
1 Alarm icon
2 Refrigerant compressor icon
3 Fan icon
4 PDP (dewpoint) temperature
5 Unit (°C or °F)
6 Alarm LED
7 Button to snooze or to reset the alarm (only for remote alarm function).
8 SET button
9 UP button
10 DOWN button
8+9 Back to previous screen
8+10 Menu
Icons
Icon Name Mode Function
Alarm Off No active alarms
On Probe failure alarm
High temperature or low
temperature alarm
Service alarm
Refrigerant compressor Off Dryer off
On Dryer on
Flashing + SE Maintenance warning
Flashing + L2 Dewpoint too low
Dryer is stopped
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Icon Name Mode Function
Flashing + H3 Too high discharge
temperature of the
refrigerant compressor
(see further)
Dryer is stopped
Fan Off Fan off
Flashing Not applicable
On Fan on
Remote alarm function
Depending on the dryer model, the controller allows to remotely control a number of alarms. This
is managed by means of a free NC (Normally Closed) contact.
The contact opens in case of an alarm or when the dryer is switched off.
Refer to the table below to identify the availability of the function and refer to the related picture to
identify the physical location of the free contact.
Availability of the remote alarm function
Model Fault message availability
P1 P2 P3 L2 H2 H3
FX 1 to FX 3 no yes no yes yes no
FX 4 and FX 5 yes yes no yes yes no
FX 6 to FX 7 yes yes yes yes yes yes
Location of the free contact (1)
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Fault messages
Flashing fault message Description Remedy
Fan control probe failure
(Only available on FX 4 to FX 7)
Replace the probe.
Dewpoint temperature probe failure Replace the probe.
Refrigerant compressor discharge
temperature probe failure
(Only available on FX 6 to FX 7 with
remote alarm function)
Replace the probe.
Pressure dewpoint too high Refer to the fault and remedies
section.
Pressure dewpoint too low Refer to the fault and remedies
section.
Refrigerant compressor discharge
temperature too high; refrigerant
compressor stopped
(Only available on FX 6 to FX 7 with
remote alarm function)
Refer to the fault and remedies
section.
Condenser discharge temperature
too high
(Only available on FX 4 to FX 7)
Refer to the fault and remedies
section.
Condenser discharge temperature
too low
(Only available on FX 4 to FX 7)
Refer to the fault and remedies
section.
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22 2920 7112 41
Flashing fault message Description Remedy
Internal EPROM error Reset by pressing one of the four
buttons.
If the problem persists, replace the
controller.
Maintenance required Perform the maintenance and reset
the alarm.
Resetting the maintenance warning
Front panel of the controller
To reset the maintenance warning, follow steps 1 to 12:
1. The display is flashing between standard view (dewpoint) and Maintenance required (SE)
alarm.
2. Push and hold buttons SET (8) and DOWN (10) to enter the menu.
3. Message “SE” appears on display.
4. Push and release the UP button (9).
5. Message “rS” appears on display.
6. Push and release the SET button (8).
7. Message “n” appears on display.
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8. Push and release the UP button (9).
9. Message “y” appears on display.
10. Push and release SET (8) to reset service alarm.
11. Message “y” blinks for 3 seconds.
12. Then “rL” is fixed and “°C” blinks on display for about 10 seconds.
The service alarm is now reset.
Setting the service interval
To set the service interval, follow steps 1 to 9:
1. PDP is showing standard view.
2. Push and hold buttons SET (8) and DOWN (10) to enter the menu.
3. Message “SE” appears on display.
4. Push and release SET (8) to enter the “SE” menu.
5. Current service interval is displayed.
(“60” or any other value between “0” and “99”)
6. Select desired service interval using the UP or DOWN button.
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(40=4000h, 55=5500h, 80=8000h,…)
7. Push and release SET to confirm the new service interval.
8. The selected value blinks during 3 seconds.
9. Then “rS” is fixed and “°C” blinks on display for ~10 seconds.
The new service interval is now set.
Freeze protection function (available with Remote Alarm function on FX 6 to FX 7)
Once the digital controller detects a dewpoint temperature below -2°C (28.4°F) during more than
2 minutes, (L2 Alarm), it switches off the refrigerant compressor.
Resetting the dryer after a refrigerant compressor stop (available with Remote Alarm function on
FX 6 to FX 7)
Before restarting the dryer it is necessary to identify the root cause. Alarms indicate
possible failures so it is necessary to contact your customer center.
Restarting the dryer without a deep investigation on possible root cause will affect the
reliability of the dryer and overrule the warranty reimbursement.
Press button 7 to reset the alarm.
The dryer restarts when both the following conditions are true:
? The dewpoint temperature is higher than -2°C (28.4°F).
? 30 seconds are passed from the refrigerant compressor stop (minimum balancing pressure
stop time). A countdown is available if the reset is made before the minimum stop time.
Silent alarm function (available with Remote Alarm function on FX 6 to FX 7)
To snooze the alarm, press button 7.
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4.4 Starting
Attention
To ensure optimum operational efficiency, do not use dryer on/off switch repeatedly
within a short time period.
Wait at least 5 minutes to start the dryer again after stopping to allow pressure
equalization.
To keep the compressed air net free of condensate, start the dryer before starting the
compressor and stop the compressor before stopping the dryer.
Procedure
FX 1 up to FX 7
Step Action
1 If installed, close the dryer by-pass valve. See Installation proposal.
2 Press dryer on/off switch (2).
3 Open dryer air inlet valve (customer''s installation).
4 Approx. 5 minutes later, open dryer air outlet valve (customer''s installation).
5 Approx. 10 minutes later, the nominal dewpoint will be reached.
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4.5 During operation
Procedure
FX 1 up to FX 7
Regularly check:
? The pressure dewpoint on the digital controller (1). The pressure dewpoint will deviate from
nominal if the air inlet conditions or volume flow differ from nominal.
? That condensate is discharged via condensate outlet. The amount depends on the operating
conditions.
4.6 Stopping
Attention
To ensure optimum operational efficiency, do not use dryer on/off switch repeatedly
within a short time period.
Wait at least 5 minutes to start the dryer again after stopping to allow pressure
equalization.
To keep the compressed air net free of condensate, start the dryer before starting the
compressor and stop the compressor before stopping the dryer.
Instruction book
2920 7112 41 27
Procedure
FX 1 up to FX 7
Step Action
1 Close the dryer inlet and outlet valve (customer’s installation).
2 Press dryer on/off switch (2), the dryer stops.
3 If provided, open the dryer by-pass valve.
Instruction book
28 2920 7112 41
5 Maintenance instructions
Safety precautions
Before starting any maintenance or repair work, close the air inlet and outlet valve and switch off
the voltage.
When removing the side panels of the dryer, be aware that internal elements such as the pipes
can be hot. Therefore, wait until the dryer has cooled down before removing the side panels.
Dryers of FX type contain refrigerant HFC.
When handling refrigerant, all applicable safety precautions must be observed. Please be
aware of the following points:
? Contact of refrigerant with the skin will cause freezing. Special gloves must be worn. In case
of contact with the skin, the skin should be rinsed with water. On no account may clothing be
removed.
? Fluid refrigerant will also cause freezing of the eyes; safety glasses must hence be worn.
? Refrigerant is hazardous. Do not inhale refrigerant vapours. Check that the working area is
adequately ventilated.
Local legislation
Local legislation may stipulate that:
? Work on the refrigerant circuit of the cooling dryer or on any equipment which influences its
function must be undertaken by an authorised control body.
? The installation is checked once a year by an authorised control body.
Instructions
? Keep the dryer clean.
? Inspect and clean the filter of the automatic condensate drain monthly, in dusty environment
drain weekly:
? Release the pressure in the dryer by pressing the TEST push button on top of the
condensate drain (before switching off the supply voltage).
? Switch off the voltage
? Remove the filter from the automatic drain and clean it with an air jet, working from
inside to outside
? Reinstall the filter
? Brush or blow off the finned surface of the condenser monthly. Do not use water or solvents.
? Apply the drain wear kit once per year (see Spare Parts list for part number).
These maintenance intervals are intended for well ventilated, non-humid and not dusty
environments.
For particularly high humidity ambient conditions, the intervals should be halved.
Instruction book
2920 7112 41 29
Preventive maintenance schedule
Weekly
(In dusty environments)
Clean the filter of the automatic condensate drain.
Monthly Brush or blow off the finned surface of the condenser.
Clean the filter of the automatic condensate drain.
Yearly / Every 4000 hours
(Whichever comes first)
Replace drain kit (2200 9020 17)
Instruction book
30 2920 7112 41
6 Device settings
Regulating and safety devices
The regulating and safety devices are factory-adjusted to obtain optimum performance of the
dryer. Do not alter the setting of any of the devices.
Instruction book
2920 7112 41 31
7 Problem solving
Condensate drain and air inlet and outlet valves
FX 1 up to FX 5
FX 6 (up to ITJ 171 402) and FX 7 (up to ITJ 169 435)
FX 6 (from ITJ 171 402) and FX 7 (from ITJ 169 435)
Instruction book
32 2920 7112 41
Reference Name
1 Inlet and outlet valves
2 Condensate drain
3 Dryer on/ off switch
4 Isolating switch
Attention
Use only authorised parts. Any damage or malfunction caused by the use of
unauthorised parts is not covered by Warranty or Product Liability.
Apply all relevant safety precautions.
Before carrying out any maintenance or repair work on the dryer:
Close air inlet and outlet valves (1) of the dryer.
Move dryer on/off switch (3) to position 0 to switch off the voltage. See section Stopping.
Open the isolating switch (4) to prevent an accidental start.
The air inlet and outlet valves (1) can be locked during maintenance or repair
work as follows:
? Close the valve.
? Using a wrench, remove the screw fixing the handle.
? Lift the handle and turn it until the slot of the handle fits over the blocking edge on
the valve body.
? Fit the screw.
Faults and remedies
Condition Fault Remedy
1 Pressure dewpoint too high Air inlet temperature too high Check and correct; if necessary,
install a pre-cooler
Ambient temperature too high Check and correct; if necessary,
draw cooling air via a duct from a
cooler place or relocate the dryer
Air inlet pressure too low Increase inlet pressure
Adjust the pressure switch
Dryer capacity exceeded Reduce air flow
Shortage of refrigerant Have circuit checked for leaks and
recharged
Refrigerant compressor does
not run
See 3
Evaporator pressure too high See 5
Condenser pressure too high See 2
2 Condenser temperature too
high or too low
Fan or fan motor out of order Check fan/fan motor
Ambient temperature too high Check and correct; if necessary,
draw cooling air via a duct from a
cooler room or relocate the dryer
Condenser externally clogged Clean condenser
Instruction book
2920 7112 41 33
Condition Fault Remedy
3 Compressor stops or does not
start
Electric power supply to
compressor is interrupted
Check and correct as necessary
Thermal protection of
refrigerant compressor motor
has tripped
Reset the thermostatic protection
Restart of the dryer has been
too fast, not enough time for
pressure balancing
Wait a few minutes and restart
4 The condensate drain
remains inoperative
Drain system clogged
(blue LED on)
Have system inspected
(See section Maintenance
instructions for filter cleaning
procedure.
5 Evaporator pressure is too
high or too low at unload
Hot gas by-pass valve
incorrectly set or out of order
Have hot gas by-pass valve adjusted
Condenser pressure too high
or too low
See 2
Shortage of refrigerant Have circuit checked for leaks and
recharged
Instruction book
34 2920 7112 41
8 Technical data
8.1 Reference conditions and limitations
Reference conditions
Unit
Compressed air inlet pressure bar(e) 7
Compressed air inlet pressure psig 101.53
Compressed air inlet temperature ?C 35
Compressed air inlet temperature °F 95
Ambient temperature °C 25
Ambient temperature °F 77
Dewpoint °C 5
Dewpoint °F 41
Limits
Unit
Maximum compressed air inlet pressure
For FX 1 – FX 5
bar(e) 16
Maximum compressed air inlet pressure
For FX 1 – FX 5
psig 232.1
Maximum compressed air inlet pressure
For FX 6 (up to ITJ 171 402) and FX 7 (up to ITJ 169 435)
bar(e) 13
Maximum compressed air inlet pressure
For FX 6 (up to ITJ 171 402) and FX 7 (up to ITJ 169 435)
psig 188.5
Maximum compressed air inlet pressure
FX 6 (from ITJ 171 402) and FX 7 (from ITJ 169 435)
bar(e) 14
Maximum compressed air inlet pressure
FX 6 (from ITJ 171 402) and FX 7 (from ITJ 169 435)
psig 203.1
Minimum ambient temperature °C 5
Minimum ambient temperature °F 41
Maximum ambient temperature °C 43
Maximum ambient temperature °F 110
Maximum compressed air inlet temperature °C 55
Maximum compressed air inlet temperature °F 122
Instruction book
2920 7112 41 35
8.2 Air dryer data
FX 1 up to FX 5 - 115 V
Air dryer type Unit FX 1 FX 2 FX 3 FX 4 FX 5
Nominal power W 159 159 193 301 383
Nominal power hp 0.21 0.21 0.26 0.40 0.51
Electric power input, compressor W 130 130 164 268 350
Electric power input, compressor hp 0.174 0.174 0.220 0.359 0.469
Electric power input, fan motor W 29 29 29 33 33
Electric power input, fan motor hp 0.039 0.039 0.039 0.044 0.044
Weight of the unit kg 19 19 20 25 27
Weight of the unit lb 41.9 41.9 44.1 55.1 59.5
Refrigerant R134a R134a R134a R134a R134a
Total charge (approx.) kg 0.160 0.180 0.290 0.350 0.470
Total charge (approx.) lb 0.35 0.40 0.64 0.77 1.03
FX 1 up to FX 5 - 230 V 50 Hz
Air dryer type Unit FX 1 FX 2 FX 3 FX 4 FX 5
Nominal power W 130 164 190 266 284
Nominal power hp 0.17 0.22 0.25 0.36 0.38
Electric power input, compressor W 101 135 161 233 251
Electric power input, compressor hp 0.135 0.181 0.216 0.312 0.337
Electric power input, fan motor W 29 29 29 33 33
Electric power input, fan motor hp 0.039 0.039 0.039 0.044 0.044
Weight of the unit kg 19 19 20 25 27
Weight of the unit lb 41.9 41.9 44.1 55.1 59.5
Refrigerant R134a R134a R134a R134a R134a
Total charge (approx.) kg 0.150 0.170 0.290 0.350 0.480
Total charge (approx.) lb 0.33 0.37 0.64 0.77 1.06
FX 1 up to FX 5 - 230 V 60 Hz
Air dryer type Unit FX 1 FX 2 FX 3 FX 4 FX 5
Nominal power W 170 170 220 310 360
Nominal power hp 0.23 0.23 0.30 0.42 0.48
Electric power input, compressor W 140 140 190 270 327
Electric power input, compressor hp 0.19 0.19 0.26 0.36 0.44
Electric power input, fan motor W 29 29 29 33 33
Electric power input, fan motor hp 0.039 0.039 0.039 0.044 0.044
Weight of the unit kg 19 19 20 25 27
Instruction book
36 2920 7112 41
Air dryer type Unit FX 1 FX 2 FX 3 FX 4 FX 5
Weight of the unit lb 41.9 41.9 44.1 55.1 59.5
Refrigerant R134a R134a R134a R134a R134a
Total charge (approx.) kg 0.160 0.170 0.28 0.350 0.450
Total charge (approx.) lb 0.35 0.37 0.62 0.77 0.99
FX 6 (up to ITJ 171 402) - FX 7 (up to ITJ 169 435) - 115 V
Air dryer type Unit FX 6 FX 7
Nominal power (at reference
ambient temperature)
kW 0.54 0.67
Nominal power (at reference
ambient temperature)
hp 0.72 0.90
Nominal power (at maximum
ambient temperature)
kW 0.79 0.91
Nominal power (at maximum
ambient temperature)
hp 1.06 1.22
Electric power input. fan motor kW 0.057 0.057
Electric power input. fan motor hp 0.076 0.076
Weight of the unit kg 51 51
Weight of the unit lb 112.2 112.2
Refrigerant R404a R404a
Total charge (approx.) kg 0.4 0.4
Total charge (approx.) lb 0.88 0.88
FX 6 (up to ITJ 171 402) - FX 7 (up to ITJ 169 435) - 230 V 50 Hz
Air dryer type Unit FX 6 FX 7
Electric power input W 609 673
Electric power input hp 0.817 0.902
Electric power input, compressor W 544 608
Electric power input, compressor hp 0.730 0.815
Electric power input, fan motor W 65 65
Electric power input, fan motor hp 0.087 0.087
Weight of the unit kg 44 44
Weight of the unit lb 97 97
Refrigerant R404A R404A
Total charge (approx.) kg 0.400 0.400
Total charge (approx.) lb 0.882 0.882
From ITJ 125 139 to ITJ 169 435 dryers are equipped with refrigerant R452A. Other technical
data reported in the table remain valid.
Instruction book
2920 7112 41 37
FX 6 (up to ITJ 171 402) - FX 7 (up to ITJ 169 435) - 230 V 60 Hz
Air dryer type Unit FX 6 FX 7
Electric power input W 629 777.5
Electric power input hp 0.843 1.043
Electric power input, compressor W 572 720.5
Electric power input, compressor hp 0.767 0.966
Electric power input, fan motor W 57 57
Electric power input, fan motor hp 0.076 0.076
Weight of the unit kg 44 44
Weight of the unit lb 97 97
Refrigerant R404A R404A
Total charge (approx.) kg 0.400 0.400
Total charge (approx.) lb 0.882 0.882
FX 6 (from ITJ 171 402) - FX 7 (from ITJ 169 435) - 115 V
Air dryer type Unit FX 6 FX 7
Nominal power (at reference
ambient temperature)
kW 0.673 0.717
Nominal power (at reference
ambient temperature)
hp 0.902 0.961
Nominal power (at maximum
ambient temperature)
kW 1.1 1.177
Nominal power (at maximum
ambient temperature)
hp 1.475 1.578
Electric power input. fan motor kW 0.057 0.057
Electric power input. fan motor hp 0.076 0.076
Weight of the unit kg 44 44
Weight of the unit lb 97 97
Refrigerant R134a R134a
Total charge (approx.) kg 0.33 0.3
Total charge (approx.) lb 0.726 0.66
FX 6 (from ITJ 171 402) - FX 7 (from ITJ 169 435) - 230 V 50 Hz
Air dryer type Unit FX 6 FX 7
Nominal power (at reference
ambient temperature)
kW 0.674 0.716
Nominal power (at reference
ambient temperature)
hp 0.903 0.96
Nominal power (at maximum
ambient temperature)
kW 0.955 1.104
Nominal power (at maximum
ambient temperature)
hp 1.28 1.48
Instruction book
38 2920 7112 41
Air dryer type Unit FX 6 FX 7
Electric power input. fan motor kW 0.065 0.065
Electric power input. fan motor hp 0.087 0.087
Weight of the unit kg 44 44
Weight of the unit lb 97 97
Refrigerant R134a R134a
Total charge (approx.) kg 0.33 0.3
Total charge (approx.) lb 0.726 0.66
FX 6 (from ITJ 171 402) - FX 7 (from ITJ 169 435) - 230 V 60 Hz
Air dryer type Unit FX 6 FX 7
Nominal power (at reference
ambient temperature)
kW 0.726 0.763
Nominal power (at reference
ambient temperature)
hp 0.973 1.023
Nominal power (at maximum
ambient temperature)
kW 1.068 1.067
Nominal power (at maximum
ambient temperature)
hp 1.432 1.43
Electric power input. fan motor kW 0.057 0.057
Electric power input. fan motor hp 0.076 0.076
Weight of the unit kg 44 44
Weight of the unit lb 97 97
Refrigerant R134a R134a
Total charge (approx.) kg 0.33 0.3
Total charge (approx.) lb 0.726 0.66
Instruction book
2920 7112 41 39
9 Pressure equipment directives
Components subject to Pressure Equipment Directive
All pressure bearing components are designed category I or less according to European Directive
97/23/EC (until 19/07/2016) or Directive 2014/68/EU (from 20/07/2016 onwards).
Instruction book
40 2920 7112 41
10 Declaration of conformity
Typical example of a Declaration of Conformity document
(1): Contact address:
Atlas Copco Airpower n.v.
P.O. Box 100
B-2610 Wilrijk (Antwerp)
Belgium
(2): Applicable directives
(3): Standards used
On the Declaration of Conformity / Declaration by the Manufacturer, the harmonized and/or other
standards that have been used for the design are shown and/or referred to.
The Declaration of Conformity / Declaration by the Manufacturer is part of the documentation that
is supplied with this device.
Instruction book
2920 7112 41 41
COMMITED TO SUSTAINABLE PRODUCTIVITY
We stand by our responsibilities towards our customers, towards the
environment and the people around us. We make performance stand
the test of time. This is what we call — Sustainable Productivity.
www.atlascopco.com
No. 2920 7112 41 / 2018 - 10 - Printed in Belgium Atlas Copco Airpower NV. All rights reserved. Designs and specifications are subject to change without notice or obligation.
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