Kaishan DRS30 User guide

Instructions for installation and operation
Compressed air refrigeration dryer
DRS30-DRS125
EN - English

2 DRS30-DRS125
Dear customer,
Thank you for deciding in favour of the DRS30-DRS125 compressed-air refrigeration dryer. Please read these installation
and operating instructions carefully before mounting and starting up the DRS30-DRS125 and follow our directions.
Perfect functioning of the DRS30-DRS125 and thus reliable compressed-air drying can only be guaranteed when the
provisions and notes stipulated here are strictly adhered to.

DRS30-DRS125 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 8
2.3 Overview of the safety instructions 8
3Proper use 10
4Exclusion from a field of application 11
5Operating instructions in accordance with the 2014/68/EU Pressure Equipment Directive 11
6Transport 11
7Storage 12
8Installation 12
8.1 Place of installation 12
8.2 Installation plan 13
8.3 Correction factors 14
8.4 Connection to the compressed-air system 15
8.5 Electrical connections 15
8.6 Condensate drain 16
9Start-up 16
9.1 Preliminary stages 16
9.2 Initial start-up 17
9.3 Shut down and restart 18
10 Technical data 19
11 Technical description 20
11.1 Control panel 20
11.2 Functional description 20
11.3 Flow chart 21
11.4 Refrigerating compressor 22
11.5 Condenser 22
11.6 Filter dryer 22
11.7 Capillary tube 22
11.8 Aluminium heat exchanger 22
11.9 Hot-gas bypass valve 22
11.10 Electronic instrument DMC35 23
11.10.1 How to switch on the dryer 23
11.10.2 How to switch off the dryer 23
11.10.3 How a service warning / alarm is displayed 23
11.10.4 How is controlled the condenser fan 24
11.10.5 How is controlled the drain solenoid valve 24
11.10.6 How to display the total hours of operation 24
11.10.7 How to change the operating parameters –SETUP menu 24
12 Maintenance, troubleshooting, spare parts and dismantling 25
12.1 Checks and maintenance 25
12.2 Troubleshooting 26
12.3 Recommended spare parts 29
12.4 Maintenance works at the refrigeration cycle 30
12.5 Dismantling the dryer 30
13 Appendices 31
13.1 Dryer dimensions DRS 30-40 31
13.2 Dryer dimensions DRS 60-80 32
13.3 Dryer dimensions DRS 100 33
13.4 Dryer dimensions DRS 125 34
13.5 Exploded diagrams 35
13.5.1 Components of the exploded diagrams 35
13.5.2 Exploded diagram DRS 30-80 36
13.5.3 Exploded diagram DRS 100 37
13.5.4 Exploded diagram DRS 125 38

4 DRS30-DRS125
13.6 Electric diagrams 39
13.6.1 Electric diagrams –list of components 39
13.6.2 Electric diagram DRS 30-100 40
13.6.3 Electric diagram DRS 125 41
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Name plate
DRS30-DRS125 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 DRS30-DRS125
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 DRS30-DRS125 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 Kaishan
Compressor USA.

Safety instructions
6 DRS30-DRS125
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 accordingly2.
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.
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.
ARIA
AIR
LUFT
AIR
ARIA
AIR
LUFT
AIR

Safety instructions
DRS30-DRS125 7
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.

Safety instructions
8 DRS30-DRS125
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 DRS30-DRS125 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.

Safety instructions
DRS30-DRS125 9
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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.
The DRS30-DRS125 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 personnel3.
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.
3
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 DRS30-DRS125
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 (5 micron minimum), 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
DRS30-DRS125 11
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 Operating instructions in accordance with the 2014/68/EU Pressure Equipment Directive
The DRS30-DRS125 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 DRS30-DRS125 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 DRS30-DRS125 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 DRS30-
DRS125 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 DRS30-DRS125 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 DRS30-DRS125 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 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.

Storage
12 DRS30-DRS125
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 …+122°F (+1°C…+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.
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 +113°F (+45°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 (not even partially).
Prevent any recirculation of the outgoing cooling air.
Protect the dryer against draughts.
SCC0001

Installation
DRS30-DRS125 13
8.2 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
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 (5 micron minimum), 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
34
9
9
8
6
5

Installation
14 DRS30-DRS125
8.3 Correction factors
Correction factor for operating pressure changes:
Inlet air pressure psig
60
80
100
120
140
160
180
200
barg
4.1
5.5
6.9
8.3
9.7
11.0
12.4
13.8
Factor (F1)
0.79
0.91
1.00
1.07
1.13
1.18
1.23
1.27
Correction factor for ambient temperature changes:
Ambient temperature ºF
80
90
100
105
110
115
ºC
27
32
38
41
43
46
Factor (F2)
1.12
1.09
1.00
0.93
0.85
0.75
Correction factor for inlet air temperature changes:
Air temperature ºF
80
90
100
110
120
130
ºC
27
32
38
43
49
54
Factor (F3)
1.24
1.23
1.00
0.81
0.66
0.54
How to find the air flow capacity:
Air flow capacity = Nominal duty x Factor (F1) x Factor (F2) x Factor (F3)
Example:
An DRS 30 has a nominal duty of 30 scfm (51 m³/h). What is the maximum allowable flow through the dryer
under the following operating conditions:
Inlet air pressure = 100 psig (6.9 barg)
Ambient temperature = 90°F (32°C)
Inlet air temperature = 110°F (43°C)
Factor (F1) = 1.00
Factor (F2) = 1.09
Factor (F3) = 0.81
Each item of data has a corresponding numerical factor which multiplied by the design air flow is as follows:
Air flow capacity = 30 x 1.00 x 1.09 x 0.81 = 26 scfm (44 m³/h)
26 scfm (44 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 =
Design air flow
Factor (F1) x Factor (F2) x Factor (F3) x Factor (F4)
Example:
With the following operating parameters:
Design air flow = 40 scfm (68 m3/h)
Inlet air pressure = 100 psig (6.9 barg)
Ambient temperature = 105°F (41°C)
Inlet air temperature = 100°F (38°C)
Factor (F1) = 1.00
Factor (F2) = 0.93
Factor (F3) = 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 =
40
= 43 scfm (73 m³/h)
1.00 x 0.93 x 1.00
Therefore the model suitable for the conditions above is DRS 60 (60 scfm [102 m³/h] - nominal duty).

Installation
DRS30-DRS125 15
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.
===== Ende der Stückli ste= ====
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 (5 micron minimum), 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%.
DRS 30-100 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.

Start-up
16 DRS30-DRS125
8.6 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 timed 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 an oil-water separator for dispersed compressor condensate and an emulsion-splitting
plant for emulsified condensate.
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.

Start-up
DRS30-DRS125 17
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 steps of the "Installation" chapter have been carried out.
•Ensure that the connection to the compressed-air system is in accordance with the provisions and that the lines are
fixed and supported properly.
•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.
•Ensure that the bypass system (if installed) is open and that the dryer is disconnected from the compressed-air
system.
•Ensure that the manual valve of the condensate drainage cycle is open.
•Remove any packaging material and other items which may block the space around the dryer.
•Establish the mains connection (plug into socket).
•Start the dryer by switching on the main switch on the control panel (pos. 1).
•Make sure that the electronic control unit is switched on.
•Ensure that the power consumption complies with the values on the name plate.
•Ensure that the fan runs properly –wait for the first interventions.
•Wait until the dew point remains stable.
•Slowly open the air inlet valve.
•Slowly open the air outlet valve.
•Slowly close the central bypass valve of the system (if installed).
•Check the pipes for air leakage.
•Ensure the proper functioning of the condensate drain cycle (wait for the first condensate discharges).
Note!
A DewPoint included in the green operating area of the electronic controller is correct according to the
possible working conditions (flow-rate, temperature of the incoming air, ambient temperature, etc.)
During the operation, the refrigerating compressor runs continuously. The dryer needs to be switched on during the
entire compressed-air usage time, even if the compressed-air compressor works periodically.

Start-up
18 DRS30-DRS125
9.3 Shut down and restart
Shut down (see Section 11.1 "Control panel")
•Ensure that the dew point temperature indicated on the electronic control unit is stable.
•Interrupt the compressed-air supply.
•After a few minutes, stop the dryer by switching off the main switch on the control panel (pos. 1).
Restart (see Section 11.1 "Control panel")
•Make sure that the condenser is clean
•Check whether or not voltage is applied at the dryer.
•Start the dryer by switching on the main switch on the control panel (pos. 1).
•Ensure that the electronic control unit is switched on.
•Wait a few minutes and then check, whether or not the dew point temperature indicated on the
electronic control unit is stable and whether or not the condensate is drained off at regular intervals.
•Establish the compressed-air supply.
During the operation, the refrigerating compressor runs continuously. The dryer needs to be switched on during the
entire compressed-air usage time, even if the compressed-air compressor works periodically.
Note!
A DewPoint included in the green operating area of the electronic controller is correct according to the
possible working conditions (flow-rate, temperature of the incoming air, ambient temperature, etc.)
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 when
starting up the device too often.

Technical data
DRS30-DRS125 19
10 Technical data

Technical description
20 DRS30-DRS125
11 Technical description
11.1 Control panel
The control panel explained below is the only dryer user interface.
1
2
ON-OFF Switch
Electronic instrument
11.2 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 15°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. It then re-enters the cycle. In phases of a reduced compressed-air load, the excess refrigerant is resupplied
automatically to the compressor via the hot gas bypass valve.
12
1
0
PQS0100
sec - min
Set
DMC35
ON