Beko DRYPOINT RA HT 20-P NA UL User guide

EN - english
Instructions for installation and operation
Compressed air refrigeration dryer
DRYPOINT®RA HT 20-350 NA UL

2 DRYPOINT® RA HT 20-350 NA UL
Dear customer,
Thank you for deciding in favour of the DRYPOINT®RA HT 20-350 NA UL compressed-air refrigeration dryer. Please
read these installation and operating instructions carefully before mounting and starting up the DRYPOINT®RA HT 20-
350 NA UL and follow our directions. Perfect functioning of the DRYPOINT®RA HT 20-350 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 HT 20-350 NA UL 3
Contents
1Name plate 5
2Safety instructions 5
2.1 Safety pictograms in accordance with DIN 4844 6
2.2 Signal words in accordance with ANSI 7
2.3 Overview of the safety instructions 7
3Proper use 9
4Exclusion from a field of application 10
5Instructions for the use of pressure equipment according to PED directive 2014/68/EU 10
7Transport 11
8Storage 11
9Installation 11
9.1 Place of installation 11
9.2 Installation plan 12
9.3 Correction factors 13
9.4 Connection to the compressed-air system 14
9.5 Electrical connections 14
9.7 Condensate drain 15
11 Start-up 16
11.1 Preliminary stages 16
11.2 Initial start-up 16
11.3 Start-up and shut down 17
13 Technical data 18
13.1 Technical data DRYPOINT RA HT 20-150 NA -P (1/115/60) UL 18
13.2 Technical data DRYPOINT RA HT 150-350 NA -E (1/230/60) UL 19
15 Technical description 20
15.1 Control panel 20
15.2 Functional description 20
15.3 Flow chart 21
15.4 Refrigerating compressor 22
15.5 Condenser 22
15.6 Aftercooler 22
15.7 Pre-Filter (1 micron) 22
15.8 Filter dryer 22
15.9 Capillary tube 22
15.10 Aluminium heat exchanger 22
15.11 Hot-gas bypass valve 22
15.12 Refrigerant pressure switches LPS –HPS –PV 23
15.13 Safety temperature switch TS 23
15.14 Aftercooler safety thermo-switch TSA 23
15.15 DMC 14 electronics (control unit compressed-air dryer) 24
15.15.1 How to switch on the dryer 24
15.15.2 How to switch off the dryer 24
15.15.3 How to display the operating parameters 24
15.15.4 How a service warning / alarm is displayed 24
15.15.5 How is controlled the drain solenoid valve 25
15.15.6 Operation of the failure / alarm dry contact 25
15.15.7 How to change the operating parameters –SETUP menu 25
15.16 Electronic level controlled condensate drain BEKOMAT 25
16 Maintenance, troubleshooting, spare parts and dismantling 26
16.1 Checks and maintenance 26
16.3 Troubleshooting 28
16.4 Recommended spare parts 31
16.5 Maintenance works at the refrigeration cycle 32
16.6 Dismantling the dryer 32

4 DRYPOINT® RA HT 20-350 NA UL
17 Appendices 33
17.1 Dryer dimensions 33
17.1.1 Dryer dimensions DRYPOINT RA HT 20-50 NA UL 33
17.1.2 Dryers Dimensions DRYPOINT RA HT 75 NA UL 34
17.1.3 Dryer dimensions DRYPOINT RA HT 100 NA UL 35
17.1.4 Dryer dimensions DRYPOINT RA HT 150 NA UL 36
17.1.5 Dryers Dimensions DRYPOINT RA HT 200-250 NA UL 37
17.1.6 Dryers Dimensions DRYPOINT RA HT 200-250 NA UL 38
17.2 Exploded diagrams 39
17.2.1 Components of the exploded diagrams 39
17.2.2 Exploded diagram DRYPOINT RA HT 20-50 NA UL 40
17.2.3 Exploded diagram DRYPOINT RA HT 75 NA UL 41
17.2.4 Exploded diagram DRYPOINT RA HT 100 NA UL 42
17.2.5 Exploded diagram DRYPOINT RA HT 150-250 NA UL 43
17.2.6 Exploded diagram DRYPOINT RA HT 300-350 NA UL 44
17.3 Electric diagrams 45
17.3.1 Electric diagrams –list of components 45
17.3.2 Electric diagram DRYPOINT RA HT 20-50 NA UL 46
17.3.3 Electric diagram DRYPOINT RA HT 75-100 NA UL 47
17.3.4 Electric diagram DRYPOINT RA HT 150 NA UL 48
17.3.5 Electric diagram DRYPOINT RA HT 200-250 NA UL 49
17.3.6 Electric diagram DRYPOINT RA HT 300-350 NA UL 50
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Name plate
DRYPOINT® RA HT 20-350 NA UL 5
1 Name plate
The name plate is on the back of the dryer and comprises all primary data of the device. Always refer to these when
contacting the manufacturer or the sales department.
All guarantee claims will expire in the event that the name plate is modified or removed.
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 HT 20-350 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 HT 20-350 NA UL compressed-air refrigeration dryer only
takes place within the permissible limit values indicated on the name 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 HT 20-350 NA 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.
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.
1
Certified skilled personnel arepersons 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 HT 20-350 NA UL 7
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
2.3 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 HT 20-350 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 through bursting 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
resulting in injuries 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".

Safety instructions
8 DRYPOINT® RA HT 20-350 NA UL
Warning!
Refrigerant leak!
A refrigerant leak involves the danger of serious injury and damage to the environment.
The DRYPOINT®RA HT 20-350 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 name 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.
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
DRYPOINT® RA HT 20-350 NA UL 9
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.
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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Exclusion from a field of application
10 DRYPOINT® RA HT 20-350 NA UL
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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5 Instructions for the use of pressure equipment according to PED directive 2014/68/EU
The DRYPOINT® RA HT 20-350 NA UL compressed-air refrigeration dryer contains pressure equipment in the sense of
the 2014/68/EU 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 Federal Republic of Germany. In countries outside the EU, 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 HT 20-350 NA UL compressed-air refrigeration dryer must only be employed within the
pressure and temperature range limits indicated by the manufacturer on the name plate.
•No welding must be carried out on the pressure parts.
•The DRYPOINT®RA HT 20-350 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 name 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 HT 20-350 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 HT 20-350 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 HT 20-350 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.

Transport
DRYPOINT® RA HT 20-350 NA UL 11
6 Transport
Check the packaging for visible loss or damage. If no visible damage can be ascertained, place the unit in close proximity
to the place of installation and unpack the device.
During this procedure, the dryer must always remain in an upright position. The components may be damaged when the
unit is tilted or turned upside down.
Store the device in a dry environment and do not expose it to extreme weather conditions.
Handle with care. Strong shocks can 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
8 Installation
8.1 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.
In case of fire, use an approved fire extinguisher,
water is not an acceptable means in cases of fire.
Minimum installation requirements:
•Select a clean dry area, free from dust, and protected
from atmospheric disturbances.
•The supporting area must be smooth, horizontal and able
to hold the weight of the dryer.
•Minimum ambient temperature +34 °F (+1 °C).
•Maximum ambient temperature +120°F (50°C).
•Allow at least a clearance of 40 in (1m) on each side of
the dryer for proper ventilation and to facilitate eventual
maintenance operations.
The dryer does not require attachment to the floor surface;
however installations where the unit is suspended require
an attachment to the hanging apparatus.
Do not obstruct the ventilation grille (not even partially).
Prevent any recirculation of the outgoing cooling air.
Protect the dryer against draughts.
SCC0001
40in - 1m
40in - 1m
40in - 1m
40in - 1m
20-50
1in - 26mm
1/2in - 14mm
3/8in - 10mm
14in - 354mm
LGT0012
1.1/4in
30mm

Installation
12 DRYPOINT® RA HT 20-350 NA UL
8.2 Installation plan
1
Air compressor
4
By-pass group
5
Dryer
5.1
Aftercooler
5.2
Pre-Filter
5.3
Alu-Dry Module
6
Compressed-air tank
8
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.
Do not obstruct the ventilation grille (not even partially).
Prevent any recirculation of the outgoing cooling air.
Protect the dryer against draughts.
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.
1
- A -
- B -
6
5.1
5.2
5.3
IN
OUT
4
6
1
5
5.3 OUT
5.2
5.1
IN
4
8
8
88

Installation
DRYPOINT® RA HT 20-350 NA UL 13
8.3 Correction factors
Correction factor for operating pressure modifications:
Inlet air pressure psig
60
80
100
120
140
160
180
200
220
230
barg
4
5.5
7
8
10
11
12.5
14
15
16
Factor (F1)
0.79
0.91
1.00
1.07
1.13
1.18
1.23
1.27
1.31
1.33
Correction factor for ambient temperature modifications:
Ambient temperature ºF
80
90
100
105
110
115
120
ºC
27
32
38
40
43
46
50
Factor (F2)
1.22
1.11
1.00
0.94
0.89
0.83
0.78
Correction factor for inlet air temperature modifications:
Air temperature ºF
140
160
170
180
195
210
ºC
60
70
76
82
90
100
Factor (F3)
1.26
1.13
1.07
1.00
0.90
0.81
Correction factor for DewPoint modifications:
DewPoint ºF
37
41
45
50
ºC
3
5
7
10
Factor (F4)
0.78
0.90
1.00
1.12
Calculation of the actual air throughput:
Actual air throughput = air throughput acc. to planning x factor (F1) x factor (F2) x factor (F3) x factor (F4)
Example:
An DRYPOINT RA HT 150 NA UL has a nominal duty of 150 scfm (255 m3/h). The highest achievable air mass
under the following operating conditions is:
−Air inlet pressure = 120 psig (8 barg)
−Ambient temperature = 105°F (40°C)
−Air inlet temperature = 195°F (90°C)
−Pressure dew point = 45°F (7°C)
Factor (F1) = 1.07
Factor (F2) = 0.94
Factor (F3) = 0.90
Factor (F4) = 1.00
Every function parameter corresponds to a numerical factor which, multiplied by the planned nominal capacity,
determines the following:
Air flow capacity = 150 x 1.07 x 0.94 x 0.90 x 1.00 = 137 scfm. (233 m³/h)
137 scfm (233 m³/h) This is the maximum flow rate that the dryer can accept under these operating conditions.
How to select a suitable dryer for a given duty:
Minimum std. air flow rate =
Designairflow
Factor(F1)xFactor(F2)xFactor(F3)xFactor(F4)
Example:
The following operating parameters are known:
−Required air mass = 95 scfm (161 m3/h)
−Air inlet pressure = 120 psig (8 barg)
−Ambient temperature = 105°F (40°C)
−Air inlet temperature = 195°F (90°C)
−Pressure dew point = 45°F (7°C)

Factor (F1) = 1.07
Factor (F2) = 0.94
Factor (F3) = 0.90
Factor (F4) = 1.00
In order to select the correct dryer model the required flow rate is to be divided by the correction factors relating to
above mentioned parameters:
Minimum std. air flow rate =
95
= 104 scfm (177 m³/h)
1.07x0.94x 0.90 x1.0
Therefore the model suitable for the conditions above is DRYPOINT RA HT 150 NA UL (150 scfm or 255 m3/h -
nominal duty).

Installation
14 DRYPOINT® RA HT 20-350 NA UL
8.4 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 name 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 name 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.
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.
8.5 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 name plate to avoid exceeding the indicated values. The voltage
tolerance is +/- 10%.
DRYPOINT RA HT 20-350 NA UL dryers are supplied with a power cord and safety plug (two-pole and earth connection).
Make sure that suitable fuses or circuit breakers in accordance with the indications on the name 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.
Do not use plug adapters at the power plug.
Possible replacement of the power plug must only be carried out by a qualified electrician.
DANGER!
Aftercooler safety thermo-switch!
Qualified personnel should carry out the connection of the aftercooler safety thermo-switch to the air
compressor.
Be sure to check that the air compressor is pressureless and not connected to the power supply.
Use the appropriate cable feedthroughs for the installation work.

DRYPOINT® RA HT 20-350 NA UL 15
8.7 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 timed condensate drain or an 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 HT 20-350 NA UL
9 Start-up
9.1 Preliminary stages
Note!
Exceeding of the operating parameters!
Ensure that the operating parameters comply with the nominal values indicated on the name plate of the
dryer (voltage, frequency, air pressure, air temperature, ambient temperature etc.).
Prior to delivery, this dryer was thoroughly tested, packed and checked. Please verify the soundness 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.
9.2 Initial start-up
Note!
The dryer must not be started up more than six times an hour. Wait at least five minutes prior to every
restart.
The user is responsible for the compliance with these provisions. 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 11.1 "Control panel")
•Ensure that all the steps of the “Installation” chapter have been observed.
•Ensure that the connection to the compressed air system is correct and that the piping is suitably fixed and supported.
•Ensure that the condensate drain pipe is properly fastened and connected to a collection system or container.
•Ensure that the by-pass system (if installed) is open and the dryer is isolated
•Ensure that the manual valve of the condensate drain circuit is open.
•Remove any packaging and other material which could obstruct the area around the dryer.
•Activate the mains switch.
•Turn on the main switch - pos. 1 on the control panel.
•Ensure that the electronic instrument DMC14 is ON.
•Ensure the consumption matches with the values of the data plate.
•Ensure the fan work properly - wait for its first interventions (Air-Cooled).
•Allow the dryer temperature to stabilise at the pre-set value.
•Slowly open the air inlet valve.
•Slowly open the air outlet valve.
•Slowly close the central by-pass valve of the system (if installed).
•Check the piping for air leakage.
•Ensure the drain is regularly cycling - wait for its first interventions.

DRYPOINT® RA HT 20-350 NA UL 17
9.3 Start-up and shut down
Start-up (refer to paragraph 11.1 Control Panel)
•Check the condenser for cleanliness.
•Verify that the system is powered.
•Activate the main switch - pos. 1 on the control panel.
•Ensure that electronic controller DMC14 is ON.
•Wait a few minutes; verify that the DewPoint temperature displayed on electronic instrument DMC14 is correct and
that the condensate is regularly drained.
•Switch on the air compressor.
Shut down (refer to paragraph 11.1 Control Panel)
•Verify that the DewPoint temperature displayed on electronic controller DMC14 is correct.
•Switch OFF the air compressor.
•After a few minutes, switch off the main switch on the control panel of the dryer (pos. 1).
NOTE : A DewPoint within 32°F (0°C) and +60°F (15°C) displayed on DMC14 is correct according to the possible
working conditions (flow-rate, temperature of the incoming air, ambient temperature, etc.).
During the operation, the refrigerating compressor will run continuously. The dryer must remain on during the full usage
period of the compressed air, even if the air compressor works intermittently.
The number of starts must be no more than 6 per hour. The dryer must stop running for at least 5 minutes
before being started up again.
The user is responsible for compliance with these rules. Frequent starts may cause irreparable damage.

Technical data
18 DRYPOINT® RA HT 20-350 NA UL
10 Technical data
10.1 Technical data DRYPOINT RA HT 20-150 NA -P (1/115/60) UL

DRYPOINT® RA HT 20-350 NA UL 19
10.2 Technical data DRYPOINT RA HT 150-350 NA -E (1/230/60) UL

Technical description
20 DRYPOINT® RA HT 20-350 NA UL
11 Technical description
11.1 Control panel
The control panel explained below is the only dryer user interface.
DRYPOINT RA HT 20 –100 NA UL
DRYPOINT RA HT 150 –350 NA UL
1
2
3
ON-OFF Switch
Electronic instrument
Air and refrigerant flow diagram
11.2 Functional description
Operating principle –The dryer models described in this manual all operate on the same principal. First the very hot
moisture laden air directly from the compressor enters the aftercooler (copper tube / aluminum fin cooling surface) where
it is cooled to within 18-20°F (10-12°C) of the ambient air temperature. It leaves the aftercooler with entrained condensed
water droplets which are separated by the 1 micron bulk liquid filter separator element and drained away by the first drain
system. The partially cooled moisture laden air next enters an air to air heat exchanger to pre-cool it. The compressed
air next goes through the evaporator, also known as the air to refrigerant heat exchanger. The compressed air
temperature is reduced to approximately 41°F (5°C), causing additional water vapor to condense to liquid. The liquid is
continuously coalesced and collected in the dryer separator for automatic removal by the second condensate drain. The
cool moisture free compressed air then passes back through the air to air heat exchanger to be reheated to within the
ambient temperature as it exits the dryer.
Refrigeration cycle –Refrigerant gas is cycled through the compressor and exits at high pressure to a condenser where
heat is removed causing the refrigerant to condense to a high-pressure liquid state. The liquid is forced through a capillary
tube where the resulting pressure drop allows the refrigerant to boil off at a predetermined temperature. Low-pressure
liquid refrigerant enters the heat exchanger where heat from the incoming air is transferred causing the refrigerant to boil;
the resulting phase change produces a low pressure, low temperature gas. The low-pressure gas is returned to the
compressor, where it is re-compressed and begins the cycle again. During those periods when the compressed air load
is reduced the excess refrigerant is by-passed automatically back to the compressor via the Hot Gas By-pass Valve circuit.
K
1
23
PQS0003
DMC14
1
0
K
I
ON
13
set
DMC14
°C
esc
°F
2
PQS0004