BERG DRYBERG RF Operating instructions

OPERATING AND MAINTENANCE MANUAL
REFRIGERATION DRYER
DRYBERG RF

USER’S QUICK GUIDE
ATTENTION
Before starting units of this type, ensure that all personnel involved have read and understood Chapter 2 “Safety” and
follow the procedures set down in Chapter 6 “Start-up”.
0.1 Unit ON-OFF
The unit can be switched on and off from the keypad by pressing key for 1 second; OFF status (stand-by) is confirmed
by a display message.
In addition, the unit can also be switched on and off by a digital input, if configured. If the unit is switched on from a digital
input it can be switched off from the keypad.
Digital input OFF status is shown on the display by means of a lit decimal point “OF.F”. When the unit is in “OF.F” status
the ON-OFF key is inhibited. In the transition to ON from a digital input, the unit returns to the prior “OF.F” status unless the
value of “controller On-off command” is changed from the supervision system.
0.2 Condensate discharge key
The yellow condensate discharge key serves to open the relative valve manually (if the condensate discharge function is set
as timer controlled); moreover, if selected from parameter H1=3 the discharge time (H4) can be reprogrammed; in this case
the flashing red discharge icon will be displayed.
0.3 Keypad lock
To lock or unlock the keypad, press keys + for 5 seconds.
The keypad lock is shown for a few seconds by the message “POF”, keypad unlocked is shown with “POn”.
The type of lock can be selected using parameter “blK” (the message “.” is shown on the display):
blK=0 keypad enabled
blK=1 entire keypad disabled
blk=2 only ON/OFF key enabled
When the keypad is disabled pressing any key will produce the message “POF”.
NOTE
When the unit is shipped from the factory the keypad is unlocked.
0.4 Alarms reset
To reset manual reset alarms (even with the controller in OFF status):
1. Press for more than 2 seconds but less than 5 seconds.
2. When the key is released the command is confirmed by the appearance of message “rES” for several seconds.

CONTENTS
USER’SQUICK GUIDE.........................................................................................................................1
0.1 Unit ON-OFF ....................................................................................................1
0.2 Condensate discharge key.................................................................................1
0.3 Keypad lock ......................................................................................................1
0.4 Alarms reset ......................................................................................................1
TABLE OF CONTENTS..........................................................................................................................2
Chapter 1
GENERAL INFORMATION ....................................................................................................................4
Chapter 2
SAFETY ................................................................................................................................................5
2.1 General ..............................................................................................................5
2.2 General precautions...........................................................................................5
2.2.1 Compressed gases to be dried .........................................................................5
2.2.2 Lifting and transport precautions ....................................................................5
2.2.3 Precautions to observe during installation and operation of the unit ............5
2.2.4 Maintenance precautions ................................................................................6
2.3 Refrigerant gases...............................................................................................6
2.3.1 Characteristics of R134a refrigerant ...........................................................................................................6
2.4 Refrigerants safety datasheet ............................................................................7
Chapter 3
TECHNICAL DATA................................................................................................................................9
3.1 Data plate and meaning of abbreviations..........................................................9
3.2 Declaration of conformity...............................................................................10
3.3 Performance ....................................................................................................10
3.3.1 Sound level measurements .............................................................................10
Chapter 4
DESCRIPTION.....................................................................................................................................11
4.1 Operating principle .........................................................................................11
4.2 Overall dimensions .........................................................................................11
4.3 Minimum distances from the walls of the installation room ..........................11
4.4 Air and refrigerant circuits..............................................................................11
4.4.1 Air circuit .....................................................................................................11
4.4.2 Refrigerant circuit .........................................................................................11
4.5 Electrical circuit..............................................................................................11
Chapter 5
INSTALLATION...................................................................................................................................12
5.1 Location ..........................................................................................................12
5.2 Pipelines..........................................................................................................13
5.3 Electrical connections .....................................................................................13
5.3.1 Supervision kit and general alarm connection ..............................................14
Chapter 6
START-UP...........................................................................................................................................15
Chapter 7
ELECTRONIC CONTROLLER RF .........................................................................................................16
7.1 User interface ..................................................................................................16
7.2 Keypad buttons ...............................................................................................16
7.3 Display and LEDs ...........................................................................................16
7.4 Display messages ............................................................................................17

7.5 Programming and use of the keypad...............................................................18
7.5.1 Unit ON-OFF .................................................................................................18
7.5.2 Condensate discharge key ..............................................................................18
7.5.3 Controller programming .................................................................................18
7.5.4 Keypad lock .....................................................................................................19
Chapter 8
FUNCTIONS ........................................................................................................................................20
8.1 Compressor .....................................................................................................20
8.2 Condensate discharge .............................................................................................................................20
8.3 Remote On/Off .......................................................................................................................................20
8.4 Available digital input ............................................................................................................................20
8.4.1 External alarm function ..............................................................................................................................21
8.4.2 External blocking alarm function ...............................................................................................................21
8.4.3 Pressure switch trip function ......................................................................................................................21
8.5 Serial connection.............................................................................................21
Chapter 9
ALARMS .............................................................................................................................................22
9.1 Alarms description ..........................................................................................22
9.2 Alarms table............................................................................................................................................23
Chapter 10
PARAMETERS.....................................................................................................................................24
10.1 Description of parameters ...............................................................................24
10.2 Parameters table......................................................................................................................................25
10.2.1 User interface parameters ..........................................................................................................................25
10.2.2 Alarms queue ..............................................................................................................................................26
10.2.3 Variables accessible solely via supervision ................................................................................................26
Chapter 11
SAFETY PRESSURE SWITCHES / CONDENSATE DISCHARGE UNIT ...................................................28
11.1 Pressure switches ....................................................................................................................................28
11.2 Condensate discharge system .................................................................................................................28
11.2.1 Timed condensate discharge system ...........................................................................................................29
11.2.2 Smart condensate discharge system ...........................................................................................................29
Chapter 12
OPERATION AND MAINTENANCE ......................................................................................................30
12.1 Operation ................................................................................................................................................30
12.2 Maintenance............................................................................................................................................30
12.2.1 Access to the dryer ......................................................................................................................................30
12.3 Maintenance Schedule ....................................................................................31
Chapter 13
TROUBLE SHOOTING .........................................................................................................................32
Chapter 14
RISK ANALYSIS: RESIDUAL RISK ......................................................................................................38

CHAPTER 1
GENERAL INFORMATION
This manual refers to units denominated “dryers”.
Dryers are designed to remove the moisture from a flow of “compressed gas”.
The dryers are equipped with a refrigerant circuit designed to cool the compressed air to a temperature designated
“pressurized dew point”.
Since, in the majority of applications, the gas to be dried is compressed air, hereinafter the term “compressed air” is used for
the sake of simplicity, even though the specific gas in an individual application may be different. Hereinafter the expression
“pressure” is used to indicate relative pressure.
The following general symbols are to be found on the decals affixed to the unit and also in the dimensional drawings and
refrigerant circuit diagrams in this manual.
The meaning of each symbol is indicated below:
ATTENTION
This manual gives the user, the installer and the maintenance technician all the technical information required to
install, commission and operate the dryer and carry out the routine maintenance operations to ensure maximum service life.
Use only genuine parts when carrying out routine maintenance or repairs.
For all INFORMATION or requests for SPARE PARTS concerning the dryer please contact your distributor or the nearest
service centre, providing the SERIAL NUMBER and TYPE of the unit shown on the data plate as well as on the last page of
this manual.
SYMBOL DESCRIPTION SYMBOL DESCRIPTION
Unit air inlet Unit air outlet
Condensate discharge Flow of cooling air
(air-cooled models)
Direction of fan rotation
(air-cooled models)
Direction of the refrigerant gas
flow
See chap. 2.2.3 “Precautions to
observe during installation and
operation of the unit“

CHAPTER 2
SAFETY
ATTENTION
This plant is designed for safety in its intended use, provided it is installed, commissioned, and serviced in compliance
with the instructions given in this manual.
The unit contains electrical components that operate at mains voltage and also moving parts such as fan units, it must
therefore normally be disconnected from the electrical power supply before it is opened.
Operation, overhauls or repair of the unit or any maintenance operations that call for access to the plant must be executed by
skilled or suitably qualified personnel who are fully aware of all the necessary precautions, preferably under the guidance of
a qualified supervisor.
2.1 General
The user must ensure that all personnel involved in operating and servicing the unit and the auxiliary equipment have read
and understood all the warnings, precautions, prohibitions and notes given in this manual and affixed to the unit.
If the user adopts operational procedures or uses tools or working procedures that are not specifically recommended, care
must be taken to ensure that the dryer and the auxiliary equipment are not damaged or made unsafe and that no risks emerge
in relation to persons or property.
Any improper use of the machine will relieve the manufacturer from any liability for possible personal injury or property
damage.
Arbitrary modifications made to the unit will automatically invalidate all forms of guarantee provided by the manufacturer.
2.2 General precautions
2.2.1 Compressed gases to be dried
Compressed gases to be dried should be compatible with the materials used (aluminium alloys, carbon steel, cast iron, copper
and its alloys) and could be, for example, air, nitrogen, argon and helium.
ATTENTION
The compressed gases must not give rise to phenomena of corrosion that could impair the condition of pressurized
containers and they must not be able to cause fire or explosions in the event of leakage or expulsion.
2.2.2 Lifting and transport precautions
When a load is lifted from the ground keep well clear of the area beneath the load and the immediately surrounding area.
Keep rates of acceleration and lifting well within safety limits and never leave a suspended load attached to a hoist any longer
than strictly necessary.
Handling of dryers must be carried out in compliance with the diagrams given (see the final part of this manual).
The manufacturer does not supply load spreaders, lifting straps or hooks with the unit.
ATTENTION
The unit’s weight is shown on the data plate and on the label affixed to the crate.
2.2.3 Precautions to observe during installation and operation of the unit
For connection to the mains power supply follow the prescriptions given in Chapter 5 “Installation” and refer to the electrical
diagrams.
All pipelines must be painted and marked clearly in compliance with local safety prescriptions in force in the place of
installation.
Do not remove or tamper with safety devices, protections, or the insulating materials installed in the unit or in the auxiliary
equipment.
ATTENTION
Keep all compressed air connectors blocked by means of a suitable wrench during
connection to the compressed air supply system

The dryer and its auxiliary equipment must be connected to earth and protected against short circuits and overloads.
When the unit is powered, the voltage in the electrical circuit assumes potentially lethal values so the maximum precautions
must be adopted if work is to be carried out on the electrical circuit.
Do not open the electrical equipment enclosure panels while the electrical system is powered unless this is strictly necessary
for the execution of tests, measurements or settings.
This work must be carried out exclusively by qualified personnel equipped with suitable tools and wearing all the relevant
protective equipment to safeguard against electrical hazards.
2.2.4 Maintenance precautions
If replacement parts are needed use only original spares.
Keep a written record of all work carried out on the unit and the auxiliary equipment.
The frequency and the nature of the work required over a period can reveal adverse operating conditions which should be
corrected.
Use only refrigerant gas specified on the data plate of the unit.
Make sure that all instructions concerning operation and maintenance are strictly followed and that the complete unit, with all
accessories and safety devices, is kept in good working order.
Always keep the plant clean.
Protect components and exposed openings, plugging them, for example, with clean rags.
Precautions must be taken when carrying out welding or any repair operation which generates heat, flames or sparks.
Components in the vicinity must be protected with non-flammable material.
Do not weld or perform work that generates heat close to a system that contains oil.
Before performing any such work all systems that may contain oil must be completely drained and flushed, for example, with
steam.
Do not weld or modify a container that may be subject to pressurization.
To prevent an increase in working temperature, inspect and clean heat transfer surfaces (i.e. condenser fins) regularly.
For all dryers establish a convenient time interval for cleaning procedures.
Never use an open flame as a light source to inspect parts of the dryer.
Before dismantling parts of a plant ensure that all mobile and heavy parts are securely fixed, and ensure electrical power has
been disconnected.
When a repair has been completed make sure that no tools, detached parts or rags are left in the dryer.
All guards must be refitted after carrying out repair or maintenance work.
Do not use flammable liquids to clean components while the unit is running.
If non-flammable hydrocarbons containing chlorine are used all the relevant safety precautions must be adopted to protect
against the toxic fumes that may be given off.
Before removing any panels or dismantling any part of the unit, carry out the following operations:
•Isolate the unit from the electrical power supply by disconnecting the supply upstream of the power feeding
line.
•Lock out the disconnect switch (if present) in the “OFF” position by fitting a padlock.
•Place a sign on the handle of the disconnect switch (if present) or in its immediate proximity stating “WORK
IN PROGRESS - DO NOT CONNECT POWER”.
•Do not set the electrical power switch to ON or attempt to start the unit if the warning sign is displayed.
Coloured tracers can be used in service-maintenance operations.
Inspect all refrigerant circuit joints including connectors, flanges, and more generally all critical points (open joints) in order
to prevent possible leakage of refrigerant gas.
2.3 Refrigerant gases
The plants can be charged only with R134a.
The use and storage of cylinders containing refrigerants must be in compliance with the prescriptions of the manufacturers of
the cylinders and in compliance with the applicable safety laws and prescriptions in force in the place of installation.
2.3.1 Characteristics of R134a refrigerant
At normal temperature and pressure conditions, this is a class A1 colourless gas (classification EN 378-1).
Concentrations significantly above 1000 ppm v/v can cause narcotic effects.
In the event of leakages provide adequate ventilation of the room before entering.

2.4 Refrigerants safety datasheet
Denomination: R134a (1,1,1,2 - tetrafluoroethane).
INDICATION OF HAZARDS
Major hazards: Suffocation.
Specific hazards: Unknown.
FIRST AID MEASURES
General information: Do not attempt to administer liquids or solids to persons who have lost consciousness.
Inhalation: Move victims to the open air. Use oxygen or artificial respiration if necessary. Do not
administer adrenaline or similar substances.
Contact with the eyes: Wash thoroughly with plenty of clean water for at least 15 minutes and seek medical
assistance.
Contact with the skin: Wash immediately in plenty of clean water.
Remove contaminated clothing immediately.
FIRE-FIGHTING MEASURES
Means of extinction: Any.
Specific hazards: Pressure rise.
Specific methods: Cool containers with water spray.
MEASURES IN THE EVENT OF ACCIDENTAL LEAKAGE
Individual precautions: Evacuate personnel to safe muster points. Provide adequate ventilation. Use means of
personal protection.
Environmental precautions: Evaporates.
Cleaning methods: Evaporates.
HANDLING AND STORAGE
Handling
Technical measures/ precautions: Use exclusively in well-ventilated places.
Recommendations for safe use: Pressure test. Do not perform any pressure tests with air/R134a mixtures. The refrigerant
may form a combustible mixture with air at pressures above atmospheric pressure when
the ratio by volume is greater than 60%.
Storage: Close properly and store in a cool, dry well-ventilated place.
CONTROL OF EXPOSURE/INDIVIDUAL PROTECTION
Control parameters: 1000 ppm v/v or ml/m3 as weighted average over an 8 hour period.
Respiratory protection: For rescue and maintenance work in tanks, use autonomous breathing apparatus.
The vapours are heavier than air and can cause suffocation, reducing the oxygen
available for breathing.
Protection of the eyes: Safety spectacles.
Protection of the hands: Rubber gloves.
Hygiene measures: Do not smoke.
PHYSICAL AND CHEMICAL PROPERTIES
Colour: Colourless.
Odour: Similar to ether.
Boiling point: -26.5 °C / -15.7 °F at atmospheric pressure.
Flash point: Non-flammable.
Relative density: 1.21 kg/l at 25°C.
Water solubility: 0.15% by weight at 25 °C at atmospheric pressure.
STABILITY AND REACTIVITY
Stability: No reactivity if used in compliance with the relative instructions.
Materials to avoid: Alkaline metals, alkaline earth metals, granulated metal salts, Al, Zn, Be, etc. in powder
form.
Hazardous decomposition
products:
Halogen acids, traces of carbonyl halides.
TOXICOLOGICAL INFORMATION
Acute toxicity: ALC/inhalation/4 hours/in rat = 567 ml/l.
Local effects: concentrations significantly above 1000 ppm v/v can cause narcotic effects. Inhalation of
products in decomposition can lead to respiratory difficulty (pulmonary oedema).
Long-term toxicity: No carcinogenic, teratogenic, or mutagenic effects observed in laboratory animals.

ECOLOGICAL INFORMATION
Global warming potential HGWP
(R11=1):
0.28
Ozone depletion potential ODP
(R11=1):
0
Considerations on disposal: Can be recycled after reconditioning.

CHAPTER 3
TECHNICAL DATA
3.1 Data plate and meaning of abbreviations
The main data of the dryer are specified on the data plate of the unit:
On the data plate and on the wiring diagram you will find the following abbreviations:
MODEL and CODE The model number and the code identify the size of the unit and the type of
construction.
MANUAL This is the code number of the manual.
SERIAL NUMBER This is the serial or construction number of the unit.
MANUFACTURING YEAR This is the year of the final test of the unit.
VOLTAGE/PHASE/FREQUENCY Electrical power supply characteristics.
MAX CURRENT INPUT
(I max)
Current consumed by the unit during the limit working conditions (refrigerant
condensing and evaporation temperature of respectively 70 °C/158 °F and 10 °C/
50 °F).
INSTALLED POWER
(P max)
Current consumed by the unit during the limit working conditions (refrigerant
condensing and evaporation temperature of respectively 70 °C/158 °F and 10 °C/
50 °F).
PROTECTION RATING According to European standard EN 60529.
REFRIGERANT This is the refrigerant fluid in the unit.
REFRIGERANT QUANTITY This is the quantity of refrigerant fluid contained in the unit.
MAX. REFRIGERANT PRESS. Refrigerant circuit design pressure.
MAX. REFRIGERANT TEMP. Refrigerant circuit design temperature.
USER CIRC. FLUID Fluid cooled by unit.
MAX. WORKING PRESSURE Max. design pressure of the user circuit.
MAX. TEMPERATURE Maximum design temperature of the user circuit; this should not be confused with
the maximum working temperature which is established when the offer is made.
SOUND PRESSURE LEVEL Sound pressure level in a free field in hemispherical irradiation conditions
(open field) at a distance of 1 m (39.37in) from the unit, condenser side, and at
1.6m (63.0in) from the ground.
AMBIENT TEMPERATURE Min. and max. cooling air temperature value.
WEIGHT This is the approximate weight of the unit before packing.
CONDENSER COOLING FLUID Fluid used by the unit to cool the condenser (this data is not present if the unit
condenser is air cooled).
MAX. WORKING PRESSURE Max. design pressure of the condenser cooling circuit (this data is not present if the
unit condenser is air cooled).
MAX. TEMPERATURE Condenser cooling circuit maximum design temperature (this information is not
given if the unit condenser is air cooled).
IMAX full load amperage;
PMAX full load power;
ILR locked rotor current.

3.2 Declaration of conformity
List:
a) Name of manufacturer
b) Definition of responsibility
c) Unit model
d) Serial or construction number of the unit
e) Year of the unit’s final test
f) Directives and standards
g) Officer responsible for technical file
h) Technical supervisor personal data
3.3 Performance
ATTENTION
The performance of the dryer (dew point, power consumption, pressure drops, etc.) depends mainly on the flow rate and
pressure of the compressed gas to be dried and on the condenser cooling fluid temperature (ambient temperature).
These data, which are usually defined at the time of the offer, constitute the basic point of reference in relation to dryer
performance.
3.3.1 Sound level measurements
The noise emission values measured are below 70 dB(A).
FACSIMILE

CHAPTER 4
DESCRIPTION
4.1 Operating principle
In the dryers described in this manual a refrigerant circuit cools the aluminium surface of an evaporator through which the
humid compressed air to be dried flows. The air cools, condensing the water vapour it contains, which is then separated and
discharged.
Before leaving the plant, the cold compressed air passes through an air/air exchanger in which it heats up while cooling the
humid compressed air entering the dryer.
If the cooling output generated by the unit is greater than that required, a solenoid valve is activated, located on intake to the
compressor and equipped with an additional calibrated hole: closure of the solenoid valve forces the refrigerant to pass
through the additional calibrated hole, reducing the flow rate of the refrigerant processed by the compressor. This enables a
reduction in cooling output and electrical consumption.
On units with capacity step control, if the cooling output is still too high, the cooling compressor will be shut down, to
exploit the thermal mass of the aluminium heat exchanger.
4.2 Overall dimensions
For the drawings, consult the annexes to the manual.
4.3 Minimum distances from the walls of the installation
room
For the drawings, consult the annexes to the manual.
4.4 Air and refrigerant circuits
For the drawings, consult the annexes to the manual.
4.4.1 Air circuit
The air/air heat exchangers and the evaporator are of compact type in aluminium.
The warm and moist compressed air enters the dryer through the air/air exchanger; here, the air is precooled by the cold dry
compressed air at the outlet of the air/refrigerant exchanger or evaporator. The precooled air then enters the evaporator,
where it is cooled further, transferring heat to the refrigerant, which consequently evaporates.
At the point, the compressed air is in a saturated condition and it entrains the condensate resulting from the cooling process.
The condensate is separated from the air flow by a metal mesh (AISI304) demister and it falls due to gravity onto the bottom
of the thermal module, from where it is collected and expelled.
The dry cold air flows a second time through the air/air exchanger where it warms up and cools the humid air entering the
dryer.
This air/air exchanger both reduces the amount of energy required to dry a given flow of air and also has the benefit of
reducing the relative humidity thereby avoiding the risk of the formation of condensate at the dryer outlet.
4.4.2 Refrigerant circuit
The refrigerant gas is forced by the compressor into the condenser, where it changes from the gaseous to the liquid phase.
The condenser is a finned core heat exchanger and it is cooled by an air flow produced by a fan unit.
Downstream from the condenser, the liquid refrigerant flows through a lamination device that reduces its pressure.
The refrigerant then enters the evaporator where it cools the compressed air; when it flows out of the evaporator it is in the
form of a saturated vapour that entrains a small quantity of liquid.
The refrigerant is then sucked into the compressor again and the cycle is repeated.
If the cooling capacity produced by the unit is greater than the required cooling capacity, a solenoid valve trips to reduce the
capacity of the circuit. This capacity control reduces the cooling capacity of the unit and also reduces energy consumption.
If the cooling capacity remains too high even with capacity control active, the refrigerant compressor will be stopped and the
thermal mass of the aluminium exchanger will be utilized for cooling purposes.
4.5 Electrical circuit
The drawings are given in the annexes to the manual.

CHAPTER 5
INSTALLATION
ATTENTION
Before installing or operating these dryers, ensure that all personnel involved have read and understood Chapter 2
“Safety” in this manual.
ATTENTION
It is mandatory to install a prefilter upstream of the dryer to avoid exchanger fouling problems. It is good practice to
install also a coalescent deoiler filter.
5.1 Location
1. The unit can be installed either outdoors or in an enclosed environment, depending on the degree of IP protection
of the electrical panel and the unit itself.
2. If the unit is installed indoors the place of installation must be well ventilated. In certain cases it may be necessary
to install ventilation fans or extractor fans in order to reduce room temperature.
3. The ambient air must be clean, avoid sea ambients (brackish air), and not contain flammable gas or corrosive
solvents.
4. The minimum and maximum working ambient temperature are specified on the unit data plate. Ensure that the
unit is not installed in flows of hot air emitted by other equipment.
In extremetemperature conditions, the protection devices may trip.
5. Do not obstruct or interfere with the air flow produced by the unit; comply strictly with the minimum spaces/
distances specified in the installation drawings.
6. The machine must be installed on a perfectly horizontal flat surface, built and calculated to withstand the machine’s operating
weight, especially in the contact points highlighted in the installation drawing. In the event of installations which fail to
comply with the above requirements, the manufacturer’s warranty cover will immediately become null and void
and the unit could malfunction or even lock out.
7. Leave free space around the unit for access during service interventions (see Attachments).
8. Do not install the plant in sites exposed to strong winds; if unavoidable, install suitable windscreens.
See point 1.

9. The position of the dryer in the compressed air distribution system depends on the methods of use of the
compressed air (see installation drawing).
AThe dryer must be installed downline of the tank when the air compressor runs intermittently and the
maximum compressed air working flow rate is no higher than the flow rate delivered by the compressor (this is
the most common type of installation).
BThe dryer should be installed upline from the tank when it is sized in order to allow wide fluctuations of the air
flow rate utilized with peak values that are significantly higher than the maximum flow rate of the compressor.
5.2 Pipelines
(see installation drawing)
1. The inlet and outlet connections are clearly marked (see Chapter 1 “General information”). Pipes and connections
must be of the correct size and suitable for the working pressure. Remember to remove the protective caps from
the connections. and ensure that no debris or other material enters the connections during installation procedures.
Any foreign material that enters the connections can damage the exchanger irreparably.
2. If using steel pipes, it is advisable to install a magnesium anode on the line to prevent problems of corrosion on
the aluminium exchanger.
3. All pipelines must be equipped with suitable supports. Flexible connections are recommended to avoid pipe
stress or the transmission of vibration.
4. Make suitable arrangements so that the condensate discharge pipe drains to a suitable point. The dryer drain must
not be connected to the drains of other equipment; ideally, the dryer should drain into an open funnel. Do not route
the condensate to a common drain header because of the possibility of oil contents. We recommend the use of oil/
water separators for the collection of discharged oil. Ensure that the drainage system complies with all local
regulations.
5. Install shut-off valves on the compressed air inlet and outlet connections so that the dryer can be isolated if
necessary.
Fit as suitably sized pressure relief valve upline from the shut-off valves.
6. Install a bypass line with shut-off valves so that dryer maintenance operations can be carried out without
interfering with the compressed air supply.
7. Pipelines and other parts whose temperature may exceed 60 °C (140 °F) and that may be accidentally touched by
personnel must be protected or insulated.
8. In order to discharge the compressed air from the dryer so that the unit can be depressurized prior to maintenance
operations, fit a venting valve in the pipe between the dryer and one of the two shut-off valves.
5.3 Electrical connections
The unit’s connection to the power supply must be made in compliance with laws and prescriptions in force in the place of
installation, after having consulted the electrical diagram supplied with the plant.
The power input voltage must not surpass the tolerance limits shown on the electrical schematic, even momentarily; the
frequency and number of phases must comply with the indications on the unit’s data plate.
Unless otherwise specified, the frequency tolerance is +/-1% of the nominal value (+/-2% for short periods).
Voltage must be supplied between phase and neutral and the neutral conductor must be connected to earth in the factory
substation (TN system to IEC 364) or by the electricity company (TT system to IEC 364).
The positions of the phase conductor and the neutral conductor must not be switched.
1. air compressor
2. after-cooler
3. condensate separator
4. compressed air receiver
5. pre-filter
6. dryer
7. isolating valve

For the electrical power supply:
1. Connect the unit (terminal in the electrical panel) to the electrical earthing system of the building.
2. Ensure automatic suspension of the power supply in the event of an insulation fault (protection against indirect
contact in compliance with the prescriptions of IEC 364) by means of a residual current device (the nominal trip
current of which should normally be set to 0.03 A).
3. Make sure the level of protection against indirect contact at the source of the power feeding cable is equivalent at
least to IP2X or IPXXB.
4. At the start of the power feeding cable or the power cable supplied with the unit install a device that protects the
cable from overcurrent (short circuits) (refer to the indications in the electrical schematic).
ATTENTION
Install protection devices that limit the short circuit current to 17 kA peak in correspondence with the rated breaking
capacity if the short-circuit current in the point of installation is greater than an effective value of 10 kA.
5. Use connectors rated for the maximum required voltage at the maximum operating ambient temperature,
according to the chosen installation type (see the indications on the electrical schematic).
Indications on the electrical schematic:
1. maximum permissible size of the fuse type gG.
In general, fuses can be replaced by an automatic circuit breaker adjusted in relation to the machine maximum
current input (consult the manufacturer if necessary).
2. section and type of power cable (if not already supplied):
Ainstallation: insulated conductors, multicore cable in a cable duct, installed overhead or fixed to a masonry
structure (type C in compliance with IEC 364-5-523 1983) or without any other cables in contact;
Boperating temperature: maximum operating ambient temperature of the unit;
Ccable type: copper conductors, 70 °C / 158 °F PVC insulation (unless otherwise specified) or 90 °C / 194 °F
EPR insulation.
5.3.1 Supervision kit and general alarm connection
There are two knock-outs on the rear panel for controller supervision and remote connection of the general alarm:
For access to the dryer refer to Chapter 12 “Operation and maintenance”.
Supervision: ModBus RS485 supervision kit available
General alarm/Remote on-off/Digital input available:
Electrical power supply
see wiring diagram.

CHAPTER 6
START-UP
ATTENTION
Before starting up or operating these dryers be sure that all personnel have read and understood Chapter 2 “Safety”
in this manual.
1. Check that the dryer shut-off valves are closed and the by-pass valve is open.
2. Check that the ambient temperature is within the range indicated on the unit’s data plate.
3. Power the dryer by means of the line protection device.
4. When the unit is powered the control unit display switches on (see Chapter 7 “Electronic controller RF”).
5. Press button on the controller.
Once the programmed delay has elapsed the compressor and fan unit will start.
6. Wait for the compressor to stop when the thermal mass has reached the programmed temperature.
7. Slowly open the dryer inlet valve to pressurize the unit.
8. Slowly open the dryer outlet valve.
9. Close the dryer by-pass valve.
10. Press the manual discharge button and check that the discharge solenoid valve opens.
11. If the unit is equipped with a smart condensate discharge system, check that it is correctly installed. Check also
that it is functioning correctly.
12. If the unit is equipped with timer controlled condensate discharge, check that the discharge solenoid valve opens
again after the time interval set on the electronic controller.
The dryer is now ready for efficient operation (see Chapter 12 “Operation and maintenance”).

CHAPTER 7
ELECTRONIC CONTROLLER RF
7.1 User interface
Display:
•Machine status display
•Condensate discharge relay status
•Energy saving level
•Compressor and capacity control status
•Alarms status
7.2 Keypad buttons
The electronic control unit buttons perform the following functions:
7.3 Display and LEDs
Display and display functions:
BUTTON FUNCTION
Switches controller on and off (press for 1 second).
Manual condensate discharge (press for 1 second).
Direct parameters display or edit (press for 5 seconds) or display and edit of
password-protected parameters (press for 2 seconds). During programming phase
it selects a parameter or confirms a value.
In programming mode scrolls parameter codes or increases a parameter value.
In programming mode scrolls parameter codes or decreases a parameter value.
+To lock or unlock the keypad (press for 5 seconds).
To mute the siren, display and reset alarms.

7.4 Display messages
The controller displays the unit status by means of the following messages on the display:
•OFF
•dry
•hdP
The message “OFF” appears when the machine is switched off via the off key.
NOTE
The decimal point (“OF.F”) is shown when the machine is switched off via digital input.
The message “dry” appears when the unit is running in the normal operating range.
LED LED STATUS FUNCTION
Off Compressor OFF
Lit Compressor ON
Flashing Compressor stopped due to times management
Off Unit ON, compressor ON
Lit - Unit ON, compressor ON + Step capacity control ON
- Unit ON, compressor OFF
Flashing Not used
Off Condensate discharge disabled
Lit Condensate discharge enabled
Flashing Not used
Off Step capacity control OFF
Lit Step capacity control ON
Flashing Not used
Off No alarm condition
Lit Only illuminates during consultation of the alarms history
Flashing Active alarm
Off Normal operation
Lit Not used
Flashing Alarm for information only
Off Discharge programming not in progress
Lit Discharge programming in progress
Flashing Not used
Off Unit ON, compressor ON
Lit Unit ON, compressor OFF
Flashing Not used

The message “hdP” appears when the dew point temperature is too high.
7.5 Programming and use of the keypad
7.5.1 Unit ON-OFF
The unit can be switched on and off from the keypad by pressing key for 1 second; OFF status (stand-by) is confirmed
by a display message.
In addition, the unit can also be switched on and off by a digital input, if configured. If the unit is switched on from a digital
input it can be switched off from the keypad.
Digital input OFF status is shown on the display by means of a lit decimal point “OF.F”. When the unit is in “OF.F” status
the ON-OFF key is inhibited. In the transition to ON from a digital input, the unit returns to the prior “OF.F” status unless the
value of “controller On-off command” is changed from the supervision system.
7.5.2 Condensate discharge key
The yellow condensate discharge key provides the facility to activate (if condensate discharge is set as timer controlled) the
condensate discharge valve in manual mode.
In addition, if parameter H1 is set to 3, discharge time (H4) can be reprogrammed, i.e. the discharge time becomes equal to
the time for which the yellow key is pressed; in this case the flashing red discharge icon is displayed.
7.5.3 Controller programming
The instrument has 2 programming levels; the first (U= USER) concerns parameters that can normally be changed by the
user. The second level (S= SERVICE) concerns the SERVICE parameters, which are password protected.
To access the “S” parameters hold down the key for more than 2 seconds and less than 5 seconds, then enter the
required password (a flashing “0” will be displayed). All the parameters are visible and editable in this menu, including the
“U” parameters. To quit parameters display mode and save your changes, hold down for 5 seconds. If no keys are
pressed for more than 60 seconds the system will automatically quit parameters programming mode. The changes already
made are saved automatically.
1. Access by pressing for 5 s.
2. Select the parameter with , .
3. Press to display the value.
4. Edit the value with , .
5. Press to save the new value and go to the next
parameter.
press 5 sec. for level “U”
press 2 sec. for “S” level password

7.5.4 Keypad lock
To lock or unlock the keypad, press keys + for 5 seconds.
The keypad lock is shown for a few seconds by the message “POF”, keypad unlocked is shown with “POn”.
The type of lock can be selected using parameter “blK” (the message “.” is shown on the display):
blK=0 keypad enabled
blK=1 entire keypad disabled
blk=2 only ON/OFF key enabled
When the keypad is disabled pressing any key will produce the message “POF”.
NOTE
When the unit is shipped from the factory the keypad is unlocked.