Beko DRYPOINT RA CT 020 NA UL User guide

EN - english
Instructions for installation and operation
Compressed air refrigeration dryer
DRYPOINT® RA CT 20-500 NA UL 1ph

2 DRYPOINT® RA CT 20-500 NA 1ph UL
Dear customer,
Thank you for deciding in favour of the DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer. Please
read these installation and operating instructions carefully before mounting and starting up the DRYPOINT® RA CT 20-
500 NA UL and follow our directions. Perfect functioning of the DRYPOINT® RA CT 20-500 NA UL and thus reliable
compressed-air drying can only be guaranteed when the provisions and notes stipulated here are strictly adhered to.

DRYPOINT® RA CT 20-500 NA 1ph UL 3
Contents
1Identification plate 5
2Safety instructions 5
2.1Safety pictograms in accordance with DIN 4844 6
2.2Signal words in accordance with ANSI 7
2.4Overview of the safety instructions 8
3Proper use 10
4Exclusion from a field of application 10
6Transport 11
7Storage 11
9Installation 12
9.1Place of installation 12
9.2Installation plan 12
9.3Correction factors 13
9.4Connection to the compressed-air system 14
9.5Electrical connections 14
9.6Condensate drain 15
11Start-up 16
11.1Preliminary stages 16
11.2Initial start-up 16
11.3Shut down and restart 17
12Technical data 18
12.1Technical data DRYPOINT® RA CT 20-200 NA UL 1/115/60 18
12.2Technical data DRYPOINT® RA CT 20-500 NA UL 1/230/60 19
13Technical description 20
13.1Control panel 20
13.2Functional description 20
13.3Flow chart 21
13.5Refrigerating compressor 22
13.6Condenser 22
13.7Filter dryer 22
13.8Capillary tube 22
13.9Aluminium heat exchanger 22
13.10Hot-gas bypass valve 22
13.11Refrigerant pressure switches LPS – HPS – PV 22
13.12DMC 51 electronics (control unit compressed-air dryer) 23
13.12.1Switching the dryer on 23
13.12.2Switching the dryer off 23
13.12.3Indication of the operating parameters 23
13.12.4Indication of a Service Warning 24
13.12.5Indication of an Alarm 24
13.12.6Operation of the Service Warning / Alarm signal 25
13.12.7How to change operating parameters – SETUP menu 25
13.13Electronically level-controlled BEKOMAT condensate drain 25
14Maintenance, troubleshooting, spare parts and dismantling 26
14.1Checks and maintenance 26
14.2Troubleshooting 27
14.3Recommended spare parts 32
14.4Maintenance operation on the refrigeration circuit 33
14.5Dismantling the dryer 33
15Appendices 34
15.1Dryer dimensions 34
15.1.1Dryer dimensions DRYPOINT RA CT 20-50 NA UL 34
15.1.2Dryer dimensions DRYPOINT RA CT 75 NA UL 35
15.1.3Dryer dimensions DRYPOINT RA CT 100-150 NA UL 36
15.1.4Dryer dimensions DRYPOINT RA CT 200-250 NA UL 37
15.1.5Dryer dimensions DRYPOINT RA CT 300-350 NA UL 38
15.1.6Dryer dimensions DRYPOINT RA CT 400-500 NA UL 39

Identification plate
4 DRYPOINT® RA CT 20-500 NA 1ph UL
15.2Exploded diagrams 40
15.2.1Components of the exploded diagrams 40
15.2.2Exploded diagram DRYPOINT RA CT 20-30 NA UL 41
15.2.3Exploded diagram DRYPOINT RA CT 50 NA UL 42
15.2.4Exploded diagram DRYPOINT RA CT 75 NA UL 43
15.2.5Exploded diagram DRYPOINT RA CT 100 NA UL 44
15.2.6Exploded diagram DRYPOINT RA CT 125-150 NA UL 45
15.2.7Exploded diagram DRYPOINT RA CT 200-250 NA UL 46
15.2.8Exploded diagram DRYPOINT RA CT 300-350 NA UL 47
15.2.9Exploded diagram DRYPOINT RA CT 400-500 NA UL 48
15.3Electric diagrams 49
15.3.1Electric diagrams – list of components 49
15.3.2Electric diagram DRYPOINT RA CT 20-100 NA UL 50
15.3.3Electric diagram DRYPOINT RA CT 125-150 NA UL 51
15.3.4Electric diagram DRYPOINT RA CT 200-250 NA UL 52
15.3.5Electric diagram DRYPOINT RA CT 300-350 NA UL 53
15.3.6Electric diagram DRYPOINT RA CT 400-500 NA UL 54
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Identification plate
DRYPOINT® RA CT 20-500 NA 1ph UL 5
1 Identification plate
The identification plate is located on the back of the dryer and shows all the primary data of the machine. This
data should always be referred to when calling the manufacturer or distributor. The removal or alteration of
the identification plate will void the warranty rights.
2 Safety instructions
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Please check whether or not these instructions correspond to the device type.
Please adhere to all advice given in these operating instructions. They include essential information which
must be observed during installation, operation and maintenance. Therefore, it must be ensured that these
operating instructions are read by the fitter and the responsible operator / certified skilled personnel prior
to installation, start-up and maintenance.
The operating instructions must be accessible at all times at the place of application of the DRYPOINT®
RA CT 20-500 NA UL compressed-air refrigeration dryer.
In addition to these operating instructions, local and national regulations need to be observed, where
required .
Ensure that operation of the DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer only
takes place within the permissible limit values indicated on the type plate. Any deviation from these limit
values involves a risk for persons and for the material, and may result in malfunction or a breakdown.
After installing the device correctly and in accordance with the instructions in this manual, the dryer is ready
to operate, further settings are not required. Operation is fully automatic and maintenance is limited to
several examinations and cleaning measures which are described in the following chapters.
This manual must be available at all times for future reference and is a constituent part of the dryer.
If you have any queries regarding these installation and operating instructions, please contact BEKO
TECHNOLOGIES GMBH.

Safety instructions
6 DRYPOINT® RA CT 20-500 NA 1ph UL
2.1 Safety pictograms in accordance with DIN 4844
Observe operating instructions
General danger symbol
Supply voltage
Danger: component or system under pressure
Hot surfaces
Non-breathable air
Do not use water to extinguish the fire
Do not operate with open cover (housing)
Maintenance works or controlling measures must only be carried out by qualified personnel1
Do not smoke
Note
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6
Connection point compressed-air inlet
Connection point compressed-air outlet
Connection point condensate drain
Works can be carried out by the operator of the plant, provided that they are skilled accordingly1.
NOTE: Text that contains important specifications to be considered – does not refer to safety precautions.
1 Certified skilled personnel are persons who are authorised by the manufacturer, with experience and technical training, who are well-
grounded in the respective provisions and laws and capable of carrying out the required works and of identifying and avoiding any
risks during the machine transport, installation, operation and maintenance.
Qualified and authorised operators are persons who are instructed by the manufacturer regarding the handling of the refrigeration
system, with experience and technical training, and who are well-grounded in the respective provisions and laws.
ARIA
AIR
LUFT
AIR
ARIA
AIR
LUFT
AIR

Safety instructions
DRYPOINT® RA CT 20-500 NA 1ph UL 7
The device was carefully designed with particular attention paid to environmental protection:
 CFC-free refrigerants
 CFC-free insulation material
 Energy-saving design
 Limited acoustic emissions
 Dryer and packaging comprise reusable materials
This symbol advises the user to observe the environmental aspects and comply with the recommendations
connected with this symbol.
2.2 Signal words in accordance with ANSI
Danger! Imminent hazard
Consequences of non-observance: serious injury or death
Warning! Potential hazard
Consequences of non-observance: possible serious injury or death
Caution! Imminent hazard
Consequences of non-observance: possible injury or property damage
Notice! Potential hazard
Consequences of non-observance: possible injury or property damage
Important! Additional advice, info, hints
Consequences of non-observance: disadvantages during operation and maintenance, no danger

Safety instructions
8 DRYPOINT® RA CT 20-500 NA 1ph UL
2.4 Overview of the safety instructions
Certified skilled personnel
Installation works must exclusively be carried out by authorised and qualified skilled personnel. Prior to
undertaking any measures on the DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer,
the certified skilled personnel shall read up on the device by carefully studying the operating instructions.
The operator is responsible for the adherence to these provisions. The respective directives in force apply
to the qualification and expertise of the certified skilled personnel.
For safe operation, the device must only be installed and operated in accordance with the indications in
the operating instructions. In addition, the national and operational statutory provisions and safety
regulations, as well as the accident prevention regulations required for the respective case of application,
need to be observed during employment. This applies accordingly when accessories are used.
Danger!
Compressed air!
Risk of serious injury or death through contact with quickly or suddenly escaping compressed air
or throu
g
h burstin
g
and/or unsecured plant components.
Compressed air is a highly dangerous energy source.
Never work on the dryer when the system is under pressure.
Never direct the compressed-air outlet or condensate drain hoses at persons.
The user is responsible for the proper installation of the dryer. Non-observance of the instructions in the
"Installation" chapter leads to the expiration of the guarantee. Improper installation may result in
dangerous situations for the personnel and/or the device.
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Danger!
Supply voltage!
Contact with non-insulated parts carrying supply voltage involves the risk of an electric shock
resultin
g
in in
j
uries and death.
Only qualified and skilled personnel are authorised to run electrically-operated devices. Prior to
undertaking maintenance measures at the device, the following requirements must be met:
Make sure that the power supply is switched off and that the device is off and marked for maintenance
measures. Please also ensure that the power supply cannot be re-established during the works.
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Caution!
Refrigerant!
The compressed-air refrigeration dryer uses HFC-containing refrigerants as a coolant.
Please observe the corresponding paragraph entitled "Maintenance works at the refrigeration cycle".
Warning!
Refrigerant leak!
A refrigerant leak involves the danger of serious injury and damage to the environment.

Safety instructions
DRYPOINT® RA CT 20-500 NA 1ph UL 9
The DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer contains fluorinated
greenhouse gas/refrigerant.
Installation, repair and maintenance works at the refrigeration system must only be carried out by certified
skilled personnel (specialists). A certification in accordance with EC regulation 303/2008 must be
available.
The requirements of the EC 842/2006 directive must be met under all circumstances.
Please refer to the indications on the type plate as regards the type and amount of refrigerant.
Comply with the following protective measures and rules of conduct:
1. Storage: Keep the container tightly closed. Keep it in a cool and dry place. Protect it against heat and
direct sunlight. Keep it away from ignition sources.
2. Handling: Take measures against electrostatic charging. Ensure good ventilation/suction at the
workplace. Check fittings, connections and ducts for tightness. Do not inhale the gas. Avoid contact
with the eyes or the skin.
3. Prior to carrying out works on refrigerant-carrying parts, remove the refrigerant to such an extent that
safe working is possible.
4. Do not eat, drink or smoke during work. Keep out of the reach of children.
5. Breathing protection: ambient-air-independent respirator (at high concentrations).
6. Eye protection: sealing goggles.
7. Hand protection: protective gloves (e.g. made of leather).
8. Personal protection: protective clothing.
9. Skin protection: use protective cream.
In addition, the safety data sheet for the refrigerant needs to be observed!
Caution!
Hot surfaces!
During operation, several components can reach surface temperatures of more than 140°F (60°C).
There is the risk of burns.
All components concerned are installed inside of the closed housing. The housing must only be opened
by certified skilled personnel2.
Caution!
Improper use!
The device is intended for the separation of water in compressed air. The dried air cannot be used for
breathing-air purposes and is not suitable for the direct contact with food.
This dryer is not suitable for the treatment of contaminated air or of air containing solids.
Note!
Contaminated intake air!
In the event that the intake air is strongly contaminated (ISO 8573.1 class 3.-3 or poorer quality), we
recommend the additional installation of a prefilter (e.g. CLEARPOINT F040), to avoid clogging of the
heat exchanger.
Caution!
Heating-up through fire!
In the event of a heating-up through fire, the containers and pipes of the refrigerant system can
burst.
2 Certified skilled personnel are persons who are authorised by the manufacturer, with experience and technical training, who are well-
grounded in the respective provisions and laws and capable of carrying out the required works and of identifying and avoiding any
risks during the machine transport, installation, operation and maintenance.
Qualified and authorised operators are persons who are instructed by the manufacturer regarding the handling of the refrigeration
system, with experience and technical training, and who are well-grounded in the respective provisions and laws.

Proper use
10 DRYPOINT® RA CT 20-500 NA 1ph UL
In this case, please proceed as follows:
Switch off the refrigeration plant.
Switch off the mechanical ventilation of the machinery compartment.
Use ambient-air-independent respirators.
Containers and plants which are filled with refrigerant can burst violently in the event of fire.
The refrigerants themselves are incombustible, but they are degraded to very toxic products at high
temperatures.
Remove the container/plant from the fire zone, as there is the risk of bursting!
Cool down containers and bottles via a directed water jet from a safe position.
In the event of fire, please use an approved fire extinguisher. Water is not a suitable agent to extinguish
an electrical fire.
This must only be carried out by persons who are trained and informed about the hazards emanating
from the product.
Caution!
Unauthorised intervention!
Unauthorised interventions may endanger persons and plants and lead to malfunction.
Unauthorised interventions, modification and abuse of the pressure devices are prohibited.
The removal of sealings and leadings at safety devices is prohibited.
Operators of the devices must observe the local and national pressure equipment regulations in the
country of installation.
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Note!
Ambient conditions!
In the event that the dryer is not installed under suitable ambient conditions, the ability of the device to
condense refrigerant gas is impaired. This can result in a higher load of the refrigerating compressor, and
in a loss of efficiency and performance of the dryer.
This in turn leads to overheated condenser fan motors, to malfunction of electric components and to a
breakdown of the dryer. Failures of this type will affect warranty considerations.
Do not install the dryer in an environment in which chemicals with a corrosive effect, explosive gases,
toxic gases, evaporation heat, high ambient temperatures or extreme dust and dirt can be found.
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3 Proper use
This dryer was designed, manufactured and tested to separate the moisture which normally exists in compressed air.
Any other use is considered improper.
The manufacturer shall not be liable for problems occurring as a consequence of improper use. The user alone is
responsible for any damage resulting from that.
Furthermore, the correct use includes the compliance with the installation instructions, in particular in respect of:
• The voltage and frequency of the main voltage supply.
• The pressure, temperature and flow rate of the inlet air.
• The ambient temperature.
When delivered, the dryer is tested and fully assembled. The customer only needs to connect the device to the system
in accordance with the instructions in the following chapters.
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4 Exclusion from a field of application
Note!
Improper use!
The device is intended for the separation of water in compressed air. The dried air cannot be used for
breathing-air purposes and is not suitable for the direct contact with food.
This dryer is not suitable for the treatment of contaminated air or of air containing solids.
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Transport
DRYPOINT® RA CT 20-500 NA 1ph UL 11
5 Instructions for the use of pressure equipment according to PED directive 2014/68/EU
The DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer contains pressure equipment in the sense of
the 97/23/EC Pressure Equipment Directive. Therefore, the entire plant needs to be registered with the supervisory
authority if required in accordance with the local regulations.
For the examination prior to the start-up and for periodic inspections, the national regulations need to be observed, such
as the industrial safety regulation in the United States of America. In countries outside the US, the respective regulations
in force there need to be adhered to.
The proper use of pressure devices is the basic requirement for safe operation. As regards pressure devices, the
following points need to be observed:
 The DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer must only be employed within the
pressure and temperature range limits indicated by the manufacturer on the type plate.
 No welding must be carried out on the pressure parts.
 The DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer must neither be installed in insufficiently
ventilated rooms nor near heat sources or inflammable substances.
 To avoid fractures resulting from material fatigue, the refrigeration dryer should not be exposed to vibrations during
operation.
 The maximum operating pressure indicated by the manufacturer on the type plate must not be exceeded. It is the
installer's responsibility to install the appropriate safety and control devices. Prior to the start-up of the DRYPOINT®
RA CT 20-500 NA UL compressed-air refrigeration dryer, the connected pressure generator (compressor etc.) must
be set to the max. permissible operating pressure. The integrated safeguard needs to be checked by an approved
inspection agency.
 The documents related to the DRYPOINT® RA CT 20-500 NA UL compressed-air refrigeration dryer (manual,
operating instructions, manufacturer's declaration etc.) must be kept safe for future reference.
 No objects whatsoever must be installed at or placed on the DRYPOINT® RA CT 20-500 NA UL compressed-air
refrigeration dryer and the connecting lines.
 Installation of the plant in frost-free places only.
 Operation of the plant is only permissible with fully closed and intact housing and cover panels. Operation of the
plant with damaged housing/cover panels is prohibited.
6 Transport
Check for visible loss or damage, if no visible damage is found place the unit near to the installation point and unpack
the contents.
 To move the packaged unit we recommend using a suitable trolley or forklift truck. Hand carrying is not recommended
 Always keep the dryer in the upright vertical position. Damage to components could result if unit is laid on its side or if
placed upside down.
 Handle with care. Heavy blows could cause irreparable damage.
7 Storage
Keep the device away from extreme weather conditions
even when packaged.
Keep the dryer in an upright position, also while it is stored.
Tilting the device or turning it upside down can cause
irreparable damage to some components.
When the dryer is not in use, it can be stored in its
packaging in a dust-free and protected place at a
temperature of +34°F (+1°C) … +122°F (+50°C) and at a
specific humidity of max. 90%. If the storage period
exceeds 12 months, you should contact the manufacturer.
The packaging material is recyclable. Dispose of the material in accordance with the
directives and provisions in force in the country of destination
SCC0001

Installation
12 DRYPOINT® RA CT 20-500 NA 1ph UL
9 Installation
9.1 Place of installation
Note!
Ambient conditions!
In the event that the dryer is not installed under suitable ambient conditions, the ability of the device to
condense refrigerant gas is impaired. This can result in a higher load of the refrigerating compressor, and in
a loss of efficiency and performance of the dryer.
This in turn leads to overheated condenser fan motors, to malfunction of electric components and to a
breakdown of the dryer. Failures of this type will affect warranty considerations.
Do not install the dryer in an environment in which chemicals with a corrosive effect, explosive gases, toxic
gases, evaporation heat, high ambient temperatures or extreme dust and dirt can be found.
Minimum installation requirements:
• Choose an area which is clean and dry, free from dust and protected against atmospheric disturbances.
• The load-bearing zone must be even, horizontal and able to bear the weight of the dryer.
• Minimum ambient temperature 34°F (+1°C).
• Maximum ambient temperature +122°F (+50°C).
• Ensure a proper cooling air replacement.
• Allow a sufficient clearance on each side of the dryer for proper ventilation and to facilitate maintenance operations.
The dryer does not require attachment to the floor surface.
Do not obstruct the ventilation grille.
Prevent any recirculation of the outgoing cooling air.
Protect the dryer against draughts.
Note!
Dryers models RA CT 20 – 75 can be wall-mounted. See fixing dimensions on dimensional drawings in
the appendices section.
The hanging mounting inevitably causes the obstruction of the ventilation grid positioned on the panel
facing the wall fixing. This obstruction, in any case, does not prejudge the efficiency of the ventilation
inside the dr
y
er which is
g
uaranteed b
y
other
g
rids on the other panels.
9.2 Installation plan
1 Air compressor
2 Aftercooler
3 Condensate separator
4 Prefilter
5 Bypass group
6 Dryer
7 Compressed-air tank
8 Final filter
9 Bekomat condensate drain
Installation type A is recommended when the total consumption corresponds to the throughput rate of the compressor.
Installation type B is recommended when the air consumption constantly varies, with peak values which considerably
exceed the throughput rate of the compressor. The storage capacity of the tank must be dimensioned in such a way that
a possible short-term high air demand (peak air consumption) can be compensated.
Note!
Contaminated intake air!
In the event that the intake air is strongly contaminated (ISO 8573.1 class 3.-3 or poorer quality), we recommend the
additional installation of a prefilter (e.g. CLEARPOINT F040), to avoid clogging of the heat exchanger.
2
2
1
IN
OUT
7
- A -
- B -
1
7
6
IN
OUT
5
9
8
9
4
9
3
9
9 9
3 4
9
9
8
6
5

Installation
DRYPOINT® RA CT 20-500 NA 1ph UL 13
9.3 Correction factors
Correction factor for operatin
g
pressure modifications:
Inlet air pressure psi
g
60 80 100 120 140 160 180 203
bar
g
4 5.5 7 8 10 11 12 14
Factor
(
F1
)
0.79 0.91 1.00 1.07 1.13 1.18 1.23 1.27
Correction factor for ambient temperature modifications:
A
mbient temperature ºF 80 90 95 100 105 110 115 122
ºC 27 32 35 38 40 43 45 50
Factor
(
F2
)
1.11 1.09 1.06 1.00 0.94 0.87 0.78 0.69
Correction factor for inlet air temperature modifications:
A
ir temperature ºF 90 100 110 122 130 140 150 158
ºC 32 38 43 50 55 60 65 70
Factor
(
F3
)
1.16 1.00 0.82 0.68 0.61 0.52 0.45 0.40
Correction factor for DewPoint modifications:
DewPoint ºF 38 41 45 50
ºC 3 5 7 10
Factor
(
F4
)
1.00 1.08 1.20 1.36
Calculation of the actual air throughput:
Actual air throu
g
hput = air throu
g
hput acc. to plannin
g
x factor
(
F1
)
x factor
(
F2
)
x factor
(
F3
)
x factor
(
F4
)
Example:
The DRYPOINT RA CT 75 NA UL has a planned nominal capacity of 75 scfm (127 m³/h). The highest
achievable air mass under the following operating conditions is:
 Air inlet pressure = 120 psig (8 barg)
 Ambient temperature = 115°F (45°C)
 Air inlet temperature = 122°F (50°C)
 Pressure dew point = 50°F (10°C)
  Factor (F1) = 1.07
  Factor (F2) = 0.78
  Factor (F3) = 0.68
  Factor (F4) = 1.36
Every function parameter corresponds to a numerical factor which, multiplied by the planned nominal capacity,
determines the following:
Actual air throu
g
hput = 75 x 1.07 x 0.78 x 0.68 x 1.36 = 58 scfm
(
99 m³/h
)
58 scfm (99 m³/h) is the maximum flow rate of the dryer under the aforementioned operating conditions.
Selection of the best suitable model in accordance with the operatin
g
conditions:
Air throughput acc. to planning = Requ. air throughput
Factor
(
F1
)
x Factor
(
F2
)
x Factor
(
F3
)
x Factor
(
F4
)
Example:
The following operating parameters are known:
 Required air mass = 100 scfm (170 m3/h)
 Air inlet pressure = 120 psig (8 barg)
 Ambient temperature = 115°F (45°C)
 Air inlet temperature = 122°F (50°C)
 Pressure dew point = 50°F (10°C)

  Factor (F1) = 1.07
  Factor (F2) = 0.78
  Factor (F3) = 0.68
  Factor (F4) = 1.36
To find out the correct dryer version, the required air mass must be divided by the correction factors of the parameters
indicated above:
Air throughput acc. to planning =
100
= 130 scfm (221 m³/h)
1.07 x 0.78 x 0.68 x 1.36
The suitable model for these requirements is DRYPOINT RA CT 150 NA (with a spec. nominal capacity of
150 scfm [255 m³/h]).

Installation
14 DRYPOINT® RA CT 20-500 NA 1ph UL
9.4 Connection to the compressed-air system
Danger!
Compressed air!
All works must only be carried out by qualified skilled personnel.
Never work on compressed-air systems which are under pressure.
The operator or the user must ensure that the dryer is never operated with a pressure exceeding the
maximum pressure value indicated on the type plate.
Exceeding the maximum operating pressure can be dangerous for the operator but also for the device.
The air temperature and the air flow at the inlet of the dryer must lie within the limit values indicated on the type plate.
The connecting lines must be free from dust, iron rust, shards and other contaminations and correspond to the flow rate
of the dryer. Should air with a very high temperature be treated, the installation of an aftercooler may be necessary. For
the implementation of maintenance works, the installation of a bypass system is recommended.
The dryer was designed in such a manner that vibrations that may occur during operation are limited. Therefore, it is
advisable to employ connecting lines (flexible hoses, vibration-inhibiting fittings etc.) which protect the dryer against
possible vibrations in the pipework.
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Note!
Contaminated intake air!
In the event that the intake air is strongly contaminated (ISO 8573.1 class 3.-3) or poorer quality, we
recommend the additional installation of a prefilter (e.g. CLEARPOINT F040), to avoid clogging of the heat
exchanger.
CAUTION!
During the piping of the dryer, the inlet and outlet connections need to be supported as is shown in the
illustration.
Non-observance will cause damage.
9.5 Electrical connections
Danger!
Supply voltage!
The connection to the electric mains should only be carried out by qualified skilled personnel and must
correspond to the legal provisions in force in your region.
Prior to connecting the device, please check the type plate to avoid exceeding the indicated values. The voltage tolerance
is +/- 10%.
DRYPOINT® RA CT 20-500 NA UL dryers are supplied with a power cord and safety plug (two-pole and earth
connection). or with a junction box on the back plate.
Make sure that suitable fuses or circuit breakers in accordance with the indications on the type plate are available.
A residual-current device (RCD) with In =0.03A is suggested. The cross-section of the power supply cable must
correspond to the power consumption of the dryer. In this respect, the ambient temperature, the cable laying conditions,
the length of the cables and the requirements of the local electricity supplier need to be considered.
Danger!
Supply voltage and missing earth connection!
Important: ensure that the plant is connected to earth-ground.
Do not use plug adapters at the power plug.
Possible replacement of the power plug must only be carried out by a qualified electrician.

DRYPOINT® RA CT 20-500 NA 1ph UL 15
9.6 Condensate drain
Danger!
Compressed air and condensate under pressure!
The condensate is discharged at system pressure.
The drain pipe needs to be secured.
Never direct the condensate drain pipe at persons.
The dryer is delivered with an already integrated electronically level-controlled BEKOMAT condensate drain. Connect
the condensate drain with a collection system or container by properly screwing it on.
Do not connect the drain with pressurised plants.
Do not discharge the condensate into the environment.
The condensate accumulating in the dryer contains oil particles which were released into the air by the
compressor. Dispose of the condensate in accordance with the local provisions.
It is advisable to install a water-oil separator, to which the total amount of condensate from the compressors,
dryers, tanks, filters etc. is supplied.
We recommend ÖWAMAT oil-water separators for dispersed compressor condensate and BEKOSPLIT
emulsion-splitting plants for emulsified condensate.

Start-up
16 DRYPOINT® RA CT 20-500 NA 1ph UL
11 Start-up
11.1 Preliminary stages
Note!
Exceeding of the operating parameters!
Ensure that the operating parameters comply with the nominal values indicated on the type plate of the
dryer (voltage, frequency, air pressure, air temperature, ambient temperature etc.).
Prior to delivery, this dryer was thoroughly tested, checked and packed. Please verify the reliability of the dryer during
the initial start-up and check the perfect functioning during the first operating hours.
The initial start-up must be carried out by qualified personnel.
During the installation and operation of this device, all national regulations regarding electronics and any
other federal and state ordinances, as well as local provisions, need to be adhered to.
The operator and the user must ensure that the dryer is not operated without panels.
11.2 Initial start-up
Note!
The number of starts/stops by pressing the ON-OFF switch - pos. 1 control panel must be limited to six per
hour.
Irreparable damage can be caused by starting up the device too often.
The method below should be applied during the first start-up, after longer downtimes or subsequent to
maintenance works.
The start-up must be carried out by certified skilled personnel.
Processing sequence (see Section 8.1 "Control panel")
1. Ensure that all steps of the "Installation" chapter have been carried correctly.
2. Ensure that the connection to the compressed-air system is in accordance with the provisions and that the lines are
fixed and supported properly.
3. Ensure that the condensate drain pipe is fixed in accordance with the provisions and that it is connected with a
collection system or a container and open the drain service valve.
4. Ensure that the bypass system (if installed) is open and that the dryer is disconnected from the compressed-air
system.
5. Remove any packaging material and other items which may block the space around the dryer.
6. Establish the mains connection (plug into socket).
7. Start the dryer by switching on the ON-OFF switch on the control panel (pos. 1).
8. Make sure that the DMC 51 electronic control unit is switched on.
9. If the temperature displayed on the DMC51 electronic control unit is sufficiently high, verify that the refrigerating
compressor starts within a few minutes. NOTE! – With low temperatures, the refrigerating compressor will remain
OFF
10. Ensure that the fan runs properly – wait for the first interventions.
11. Wait until the dew point remains stable.
12. Slowly open the air inlet valve.
13. Slowly open the air outlet valve.
14. Slowly close the central bypass valve of the system (if installed).
15. Check the pipes for air leakage.
16. Ensure the proper functionin
g
of the condensate drain c
y
cle
(
wait for the first condensate dischar
g
es
)
.
Note!
A dew point between 32°F (0°C) and +50°F (+10°C) displayed on the DMC 51 control unit is considered to
be correct according to the possible operating conditions (flow rate, air inlet temperature, ambient
temperature etc.).
In the cycling operating mode (Energy Saving, ESS=YES – see section 8.11.7), the refigerating compressor is switched
ON and OFF by the DMC51 electronic control unit, according to thermal load applied to the dryer.
The dryer needs to be switched on during the entire compressed-air usage time, even if the compressed-air compressor
works periodically.

Start-up
DRYPOINT® RA CT 20-500 NA 1ph UL 17
11.3 Shut down and restart
Shut down (see Section 8.1 "Control panel")
• Ensure that the dew point temperature indicated on the DMC 51 electronic control unit is stable.
• Bypass the compressed-air supply.
• After a few minutes, stop the dryer by switching off the ON-OFF switch on the control panel (pos. 1).
Restart (see Section 8.1 "Control panel")
• Make sure that the condenser is clean.
• Start the dryer by switching on the ON-OFF switch on the control panel (pos. 1).
• Ensure that the DMC 51 electronic control unit is switched on.
• If the temperature displayed on the DMC51 electronic control unit is sufficiently high, verify that the refrigerating
compressor starts within a few minutes. NOTE! – With low temperatures, the refrigerating compressor will remain
OFF
• Wait a few minutes and then check whether or not the dew point temperature indicated on the DMC 51 electronic
control unit is stable
• Establish the compressed-air supply.
• Check that the condensate is regularly drained

Technical data
18 DRYPOINT® RA CT 20-500 NA 1ph UL
12 Technical data
12.1 Technical data DRYPOINT® RA CT 20-200 NA UL 1/115/60
MODEL DRYPOINT® RA CT 20-200 NA UL 020 030 050 075 100 125 150 200
[scfm] 20 30 50 75 100 125 150 200
Air flow rate at nominal condition (1) [m3/h] 34 51 85 127 170 212 255 340
[l/min] 566 849 1415 2123 2830 3538 4245 5660
Pressure DewPoint at nominal condition (1) [°F (°C)] Nominal ambient temperature [°F (°C)] Min...Max ambient temperature [°F (°C)] Nominal inlet air temperature [°F (°C)] Nominal inlet air pressure [psig (barg)] Max. inlet air pressure [psig (barg)] Air pressure drop - ∆p [psi (bar)] 0.4 (0.03) 1.0 (0.07) 2.2 (0.15) 2.2 (0.15) 2.0 (0.14) 2.6 (0.18) 3.3 (0.23) 1.7 (0.12) Inlet - Outlet connections [NPT-F] 1" 1.1/2" Refrigerant type Refrigerant quantity (2) [oz (kg)] 9.1/2 (0.27) 12.1/2 (0.35) 14.1/4 (0.40) 15.1/4 (0.43) 18.3/4 (0.53) 21.1/4 (0.60) Cooling air fan flow [cfm (m3/h)] 530 (900) Heat Rejection [btu/hr (kW)] 1800 (0.53) 2290 (0.67) 4090 (1.20) 4810 (1.44) 6790 (1.99) 12900 (3.78) 13100 (3.84) 13500 (3.96) Standard Power Supply (2) [Ph/V/Hz]
[kW] 0,26 0,27 0,39 0,48 0,58 1,00 1,05 1,10
[A] 2,4 2,5 3,5 4,4 5,2 9,0 9,7 10,1
Total input current [A] 3,0 4,0 4,5 4,6 8,9 10,2 10,2 10,2 Minimum Circuit Ampacity (MCA) [A] 3,6 4,9 5,5 5,6 10,9 12,6 12,6 12,6 Maximum rating of Overcurrent Protective device (MOP) [A] 6,1 8,4 9,5 9,7 19,0 22,1 22,1 22,1 Fuse max. [A]6 8 9 9 15202020 Max. noise level at 1 m [dbA] Weight [lb (kg)] 64 (29) 68 (31) 75 (34) 79 (36) 82 (37) 101 (46) 110 (50) 121 (55)
(1) The nominal condition refers to an ambient temperature of 100°F (38°C) with inlet air at 100 psig (7 barg) and 100°F (38°C). (2) Check the data shown on the identification plate. (3) "_yy" can be _MT (Timed drain) or _MB (Electronic drain)
Nominal electric consumption
< 70
R134.a R407C
180 (300) 350 (600)
1/115/60
6.1/2 (0.18)
230 (16) 203 (14)
1/2" 1.1/4"
100 (7)
38 (3)
100 (38)
34…122 (1…50)
100 (38) max.158 (70)

Technical data
DRYPOINT® RA CT 20-500 NA 1ph UL 19
12.2 Technical data DRYPOINT® RA CT 20-500 NA UL 1/230/60
MODEL DRYPOINT® RA CT 20-500 NA UL 125 150 200 250 300 350 400 500
[scfm] 125 150 200 250 300 350 400 500
Air flow rate at nominal condition (1) [m3/h] 212 255 340 425 509 594 679 849
[l/min] 3538 4245 5660 7075 8490 9905 11320 14150
Pressure DewPoint at nominal condition (1) [°F (°C)] Nominal ambient temperature [°F (°C)] Min...Max ambient temperature [°F (°C)] Nominal inlet air temperature [°F (°C)] Nominal inlet air pressure [psig (barg)] Max. inlet air pressure [psig (barg)] Air pressure drop - ∆p [psi (bar)] 2.6 (0.18) 3.3 (0.23) 1.7 (0.12) 3.6 (0.25) 1.5 (0.10) 1.9 (0.13) 1.0 (0.07) 1.5 (0.10) Inlet - Outlet connections [NPT-F] Refrigerant type Refrigerant quantity (2) [oz (kg)] 15.1/4 (0.43) 19.1/2 (0.55) 21.1/4 (0.60) 42.1/4 (1.20) 63.1/5 (1.80) 71 (2.00) Cooling air fan flow [cfm (m3/h)] 1500 (2500) 1550 (2600) Heat Rejection [btu/hr (kW)] 12800 (3.75) 13000 (3.81) 13200 (3.87) 17200 (5.04) 20300 (5.95) 26600 (7.80) 27300 (8.00) 27500 (8.06) Standard Power Supply (2) [Ph/V/Hz]
[kW] 1,00 1,05 1,10 1,39 1,64 2,19 2,48 2,50
[A] 4,5 4,8 5,1 6,4 7,6 10,0 11,3 11,4
Total input current [A] 5,3 5,3 6,3 6,5 8,6 11,3 12,0 12,0 Minimum Circuit Ampacity (MCA) [A] 6,5 6,5 7,5 7,7 10,5 13,8 14,6 14,6 Maximum rating of Overcurrent Protective device (MOP) [A] 11,2 11,212,212,618,124,124,824,8 Fuse max. [A] 10 10 12 12 15 20 20 20 Max. noise level at 1 m [dbA] Weight [lb (kg)] 101 (46) 110 (50) 121 (55) 139 (63) 203 (92) 207 (94) 331 (150) 355 (161)
(1) The nominal condition refers to an ambient temperature of 100°F (38°C) with inlet air at 100 psig (7 barg) and 100°F (38°C). (2) Check the data shown on the identification plate. (3) "_yy" can be _MT (Timed drain) or _MB (Electronic drain)
< 70
2100 (3500)
35.1/4 (1.00)
1.1/2" 2" 2 1/2"
203 (14)
1.1/4"
Nominal electric consumption
R407C
530 (900)350 (600)
1/230/60
100 (7)
100 (38) max.158 (70)
34…122 (1…50)
100 (38)
38 (3)

Technical description
20 DRYPOINT® RA CT 20-500 NA 1ph UL
13 Technical description
13.1 Control panel
The control panel explained below is the only dryer user interface.
RA CT 20 –100 NA UL
1 Main switch
2 Electronic control unit DMC 51
3 Air and refrigerant gas flow chart
RA CT 125 – 500 NA UL
1 Main switch
2 Electronic control unit DMC 51
3 Air and refrigerant gas flow chart
13.2 Functional description
Operating principle – All dryer models described in this manual function according to the same principle. The hot and
moisture-loaded air is led into an air/air heat exchanger. Afterwards, the air flows through an evaporator, which is also
known as an air/refrigerant heat exchanger. The air temperature is reduced to approximately 36°F (2°C), so that water
vapour condenses to liquid. The continuously accumulating condensate is collected in the separator to be discharged
via the condensate drain. Subsequently, the cold and dry air is led through the air/air heat exchanger, so that it is reheated
to up to 46°F (8°C) below the inlet temperature when leaving the dryer.
Refrigeration cycle – The refrigerant is conducted through the compressor and reaches a condenser under high
pressure. There, cooling-down takes place, making the refrigerant condense to a liquid state which is under high pressure.
The liquid is pressed through a capillary tube where the resulting pressure drop ensures that the refrigerant evaporates
at a defined temperature. The liquid refrigerant which is under low pressure is led into the heat exchanger, where it
expands. The cold resulting from the expansion serves to cool down the compressed air in the heat exchanger. During
this process, the refrigerant evaporates. The low-pressure gas is resupplied to the compressor, where it is compressed
again.
Operation in cycling mode (Energy Saving, ESS=YES – see section 8.11.7) – The DMC51 electronic controller
constantly monitors the temperature of the DewPoint. In low load conditions, the temperature of the DewPoint tends to
fall close to the freezing point, at this point the DMC51 controls the switching off of the compressor.
The compressor will be started again when the DewPoint temperature rises above a target value. To avoid an excessive
number of cycles, DMC51 keeps the compressor on for a minimum time (about 6 minutes) within which, if necessary,
will activate a solenoid valve EVH that enables the operation of the hot gas by-pass valve. In this way the compressor
cannot make more than 10 cycles per hour. The solenoid valve EVL and the check valve CHV (where installed) help to
extend the off time of the compressor and avoid the immediate balancing of high and low pressures of the refrigerant
circuit. The solenoid valve EVL is activated before the compressor to balance the pressures and is kept active for the
entire time during which the compressor is on.
With these dryers, the energy consumption will be adjusted closely proportional to the thermal load applied to the dryer
itself, allowing considerable energy savings in the majority of applications.
Operation in hot gas by-pass mode (NO Energy Saving, ESS=NO – see section 8.11.7) – The DMC51 electronic
controller constantly keep activated the compressor, the solenoid valve EVH and the solenoid valve EVL. In cases of a
reduced compressed-air load, the excess refrigerant is bypassed automatically to the compressor via the hot gas bypass
valve.
K
1
23
PQS0080
1
0
Set
reset
K
K
23
PQS0081
1
Set
reset
K