EKOM DK50 4VR/50 User manual

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 2 - 04/2018
CONTENTS
IMPORTANT INFORMATION ................................................................................................................. 3
1.CE MARKING ............................................................................................................................ 3
2.WARNINGS ................................................................................................................................ 3
3.ALERT NOTICES AND SYMBOLS ............................................................................................ 4
4.STORAGE AND TRANSPORT .................................................................................................. 4
5.TECHNICAL DATA ..................................................................................................................... 5
6.PRODUCT DESCRIPTION ........................................................................................................ 6
7.FUNCTION ................................................................................................................................. 8
INSTALLATION ..................................................................................................................................... 12
8.USE ........................................................................................................................................... 12
9.INSTALLATION ........................................................................................................................ 12
10.WIRING DIAGRAMS ................................................................................................................ 16
11.PNEUMATIC DIAGRAM ........................................................................................................... 18
12.FIRST OPERATION ................................................................................................................. 19
OPERATION .......................................................................................................................................... 20
13.SWITCHING THE COMPRESSOR ON ................................................................................... 20
MAINTENANCE .................................................................................................................................... 22
14.MAINTENANCE SCHEDULE ................................................................................................. 22
15.MAINTENANCE ........................................................................................................................ 22
16.STORAGE ................................................................................................................................ 25
17.DISPOSING OF THE APPLIANCE .......................................................................................... 25
18.REPAIR SERVICE .................................................................................................................... 25
19.SOLVING PROBLEMS ............................................................................................................. 25

DK50 4VR/50
04/2018 - 3 - NP-DK50 4VR50-11_04-2018
IMPORTANT INFORMATION
1. CE MARKING
Products labeled with the CE mark of compliance meet the safety guidelines (93/42/EEC) of the European
Union.
2. WARNINGS
2.1. General warnings
 This Installation, Operation and Maintenance Manual is a part of the appliance and must be kept with the
compressor. Careful review of this manual will provide the information necessary for correct operation of the
appliance.
 The safety of operating personnel and trouble-free operation of the appliance are guaranteed only if
original parts are used. Only accessories and parts mentioned in the technical documentation or expressly
approved by the manufacturer can be used.
 If any other accessories or consumable materials are used, the manufacturer cannot be held responsible
for the safe operation of the appliance. This guarantee does not cover damages originating from the use of
accessories or consumable material other than those specified or suggested by the manufacturer.
 The manufacturer guarantees the safety, reliability and function of the appliance only if:
- Installation, new settings, amendments, extensions and repairs are performed by the manufacturer or
its representative, or a service provider authorized by the manufacturer
- The appliance is used in accordance with this Installation, Operation and Maintenance Manual
 The manufacturer reserves all rights for the protection of its wiring diagrams, methods and names.
 Translation of Manual for Installation, Operation and Maintenance is carried out in accordance with the
best knowledge. In the case of ambiguities, the Slovak version of the text prevails.
2.2. General safety warnings
The manufacturer developed and designed the equipment in such a way so that any risks were excluded if it
is used according to intention. The manufacturer considers it to be its obligation to describe the following
safety measures in order to exclude residual damages.
 Operation of the appliance must be in compliance with all local codes and regulations.
 Original packaging should be kept for the return of the appliance. Only the original packaging ensures
protection of the appliance during transport. If it is necessary to return the appliance during the guarantee
period, the manufacturer is not liable for damages caused by improper packaging.
 Each time the appliance is used, the operator must make sure that it is functioning correctly and safely.
 The user must fully understand the operation of the appliance.
 The product is not intended for operation in areas with a risk of explosion.
 If any problem occurs during use of the appliance, the user must inform his supplier immediately.
2.3. Electrical system safety warnings
 The appliance must be connected to earth (grounded).
 Before the appliance is plugged in, make sure that the mains voltage and mains frequency stated on the
appliance are the same as the power mains.
 Prior to putting into operation it is necessary to check for possible damage of the equipment and
connected air and electric distributions. Damaged pneumatic and electric lines must be immediately
replaced.
 Immediately disconnect the appliance from the mains (pull out mains plug) if a technical failure occurs.
 During repairs and maintenance, ensure that:
- The mains plug is pulled out from the socket
- Pressure pipes are vented and pressure is released from the air tank.
 The appliance must be installed by an approved, qualified technician.

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 4 - 04/2018


3. ALERT NOTICES AND SYMBOLS
In the Installation, Operation and Maintenance Manual and on packaging and product, the following labels or
symbols are used for important information:
Attention, see instructions for use
Caution, risk of electric shock
Consult instructions for use
CE mark of compliance
Compressor is remote-controlled and may start without warning
Caution! Hot surface
Earth (ground) connection
Terminal for ground connection
Fuse
Alternating current
Handling mark on package – FRAGILE
Handling mark on package – THIS SIDE UP
Handling mark on package – KEEP DRY
Handling mark on package – TEMPERATURE LIMITATIONS
Handling mark on package – LIMITED STACKING
Mark on package – RECYCLABLE MATERIAL
4. STORAGE AND TRANSPORT
The compressor is shipped in cardboard that protects the appliance from damage during transport.
Caution! For transport, always use the original packaging and secure the compressor
in the upright position.
Protect the compressor from humidity and extreme temperatures during transport and storage.
A compressor in its original packaging can be stored in a warm, dry and dust-free area. Do not
store near any chemical substances.
Keep packaging material if possible. If not, please dispose of the packaging material in an
environmentally friendly way and recycle if possible.
Caution! Before moving or transporting the compressor, release all the air pressure from
the tank and hoses and drain the condensed water.

DK50 4VR/50
04/2018 - 5 - NP-DK50 4VR50-11_04-2018
5. TECHNICAL DATA
DK50 4VR/50 DK50 4VR/50S
Rated voltage /
frequency
V / Hz
3x400/50 3x400/50
Compressor output
at pressure of 6 bar
L.min-1 250 250
Compressor output at 6 bar with
dryer
MD
L.min-1
200 200
NDM 180 180
Peak compressor current A 4.7 5.1
Maximum compressor current with dryer A 4.8 5.2
Motor output kW 2.2 2.2
Air tank capacity L 50 50
Working pressure bar 6.0 – 8.0 6.0 – 8.0
Maximum operating pressure of safety valve bar 12.0 12.0
Noise LpfA [dB] 77 58
Mode of operation Continuous S1 Continuous S1
Mode of operation with dryer Continuous S1 Continuous S1
Compressor dimensions W x L x H mm 580x580x790
750x770x1015
Dimensions
with dryer
W x L x H
MD mm 580x635x790
NDM 580x635x790
Weight kg 70 128
Weight
with dryer
MD kg 81 139
NDM 89 147
Air dryer performance
Atmospheric dew point MD °C -20
Pressure dew point NDM -40
Configuration pursuant to STN EN 60 601-1 Type B, class I.
- Air leaving the dryer is filtered using a 5 µm filter at a minimum.
Climatic conditions during storage and transport
Temperature : –25°C to +55°C, 24 h to +70°C
Relative air humidity : 10% to 90 % (no condensation)
Climatic operation conditions
Temperature : +5°C to +40°C
Relative air humidity : 70%
5.1. FAD efficiency correction for differences in elevation
FADcorrectiontable
FAD efficiency refers to conditions at an elevation of 0 mamsl: Temperature: 20°C
Atmospheric pressure: 101325 Pa
Relative humidity: 0%
Elevation[mamsl] 0‐1500 1501‐2500 2501‐3500 3501‐4500
FAD[l/min] FADx1 FADx0.8 FADx0.71 FADx0.60

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 6 - 04/2018
COOLER
DK50 4VR/50
DK50 4VR/50/M
DK50 4VR/50S/M
MEMBRANE
DRYER
DRYER NDM
6. PRODUCT DESCRIPTION
6.1. Model variations and their uses
Compressors are the source of clean, oil-free compressed air used to drive dental appliances and
equipment.
Compressors models are designed for the following uses:
Dental compressors DK50 4VR/50 - are designed for independent installation in a suitable environment.
Dental compressors DK50 4VR/50/M - are designed for independent installation in a suitable
environment and are equipped with an air dryer. (MD, NDM )
Dental compressors DK50 4VR/50S - are installed in cabinets with efficient noise mufflers and are
suitable for use in office environments.
Dental compressors DK50 4VR/50S/M - are installed in cabinets and are equipped with air dryers.
(MD, NDM )
Without additional filtration equipment, the compressed air from a compressor is not
suitable for the operation of breathing appliances or similar equipment.

DK50 4VR/50
04/2018 - 7 - NP-DK50 4VR50-11_04-2018
6.2. Optional accessories
Products may be equipped with optional accessories that are not included with the basic product
and must be ordered separately:
Filter regulator / set 603022106-000 /
The filter regulator filters out impurities in the compressed air down to a size
of 5 m. The use of this accessory on a compressor without a dryer partially
reduces moisture content in the supplied compressed air. Filtered
compressed air is suitable for use anywhere its parameters meet the
stipulated requirements. The regulator ensures a supply of output air at a
constant pressure (so long as the pressure value set on the regulator is not
higher than the switching pressure set on the pressure switch).
Regulator / set 603022104-000 /
The regulator ensures a supply of output air at a constant pressure (so long
as the pressure value set on the regulator is not higher than the switching
pressure set on the pressure switch).
Automatic condensate drain / set 603013114-000 /
The automatic condensate drain automatically drains condensate from the compressor's air tank based on a
pre-set time interval.
The drain automatically opens a solenoid valve at a pre-set time interval to drain condensate from the air
tank.
 A timer is used to set the time between actuation of the solenoid valve (approximately 30 minutes).
 The time between actuations of the solenoid valve can be adjusted to a lower value if excessive amount
of condensate is generated.
- The TEST button (2) is used to check the actuation of the solenoid valve, and when pushed the
solenoid valve should open (ON) and the time between actuations of the solenoid valve begins from this
point.
- The LED (1) lights up to signalize the valve is open(ON).
12

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 8 - 04/2018
7. FUNCTION
Compressor (Fig.1)
The compressor (1) draws in air through a filter (8) and compresses it through a check valve (3) into an air
tank (2). The connected apparatus draws the compressed air from the air tank until the pressure drops to a
default preset level on the air-pressure switch (4) switching the compressor on. The compressor again
compresses air into the nozzle until the maximum pressure is reached and the compressor switches off.
Safety valve (5) prevents the pressure in air chamber from rising above the maximal allowed value. The
drain valve (7) releases the condensate from the air nozzle. Compressed, dry and clean air is then ready for
additional use in the air tank.
Compressor with membrane dryer (MD) (Fig. 2)
The compressor (1) draws in air through an inlet filter (8) and compresses it into a cooler (12). The air then
passes through a filter (16) and micro-filter (15) into the dryer (14) with the dry and clean air passing through
a check valve (3) to the air tank (2). Condensate from the filter and micro-filter is automatically released into
a drainage vessel. The dryer ensures continuous drying of the compressed air. Compressed, dry and clean
air is then ready for additional use in the air tank.
Compressor with NDM dryer (Fig. 3)
The compressor (1) draws in air through an inlet filter (8) and compresses it into the cooler. The air then
passes through the dryer chamber (23) containing the adsorbent media where moisture is removed and then
out via the check valve (3) and into the air tank (2). The adsorbent media regenerates when the drying
chamber is being evacuated, always after the compressor is switched off by the pressure switch. The air is
then released from the adsorption chamber via the open solenoid valve as it is evacuated using dry
compressed air. Air drying occurs in one chamber while regeneration occurs in the other chamber. The
mode of each chamber changes in regular cycles and the drying and regeneration processes are then
performed in the alternate chamber. Compressed, dry and clean air is then ready for additional use.
The pressure switch (24) protects the dryer from damage if the compressor operates for an extended period
of time at low pressure (less than 5 bar)
Compressor cabinet (Fig. 4)
The soundproof cabinet itself is compact yet allows sufficient exchange of cooling air. The fan (9) underneath
the compressor aggregate and the cabinet fans (33) cool the compressor and the space inside the cabinet.
The fans operate when the compressor motor is running. The cooling fans automatically start if the
temperature in the cabinet reaches over 40°C, even when the compressor is not running. The fans
automatically switch off once the cabinet temperature drops to around 32°C.
An indicator (34) located on the front of the cabinet indicates maintenance is needed on the compressor with
the NDM dryer unit (see the Maintenance Interval chapter)
Make sure that nothing impedes the free flow of air under and around the compressor.
Never cover the hot air outlet on the top back side of the case.
If placing the compressor on a soft floor such as carpet, create space for ventilation
between the base and floor or the box and floor, e.g. underpin the footings with hard pads.

DK50 4VR/50
04/2018 - 9 - NP-DK50 4VR50-11_04-2018
Fig. 1 - Compressor
Fig. 2 - Compressor with membrane dryer (MD)
1. Compressor
2. Air tank
3. Check valve
4. Pressure switch
5. Safety valve
6. Pressure gauge
7. Condensate drain valve
8. Inlet filter
9. Compressor fan
10. Compressor wheel
11. Hour meter
12. Dryer cooler
13. Plug
14. Membrane dryer (MD)
15. Micro-filter
16. Filter
17. Check valve
18. Magnetic bracket
19. Plug
20. Condensate vessel
21. Outlet valve
22. Exhaust muffler
23. Adsorption dryer (NDM)
24. Pressure switch 2
25. Cabinet pressure gauge
26. Switch
27. all bump stop
28. Cabinet connector
29. Pressure gauge hose
30. Supporting bracket
31. Compressor wheel
32. Positioning truck
33. Cabinet fan
34. Maintenance indicator

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 10 - 04/2018
Fig. 3 - Compressor with adsorption dryer (NDM )

DK50 4VR/50
04/2018 - 11 - NP-DK50 4VR50-11_04-2018
Fig. 4 - Cabinet

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 12 - 04/2018


INSTALLATION
8. USE
 The appliance must be installed and operated in a dry, well ventilated and dust-free area where ambient
temperature is within the range of +5°C to +40°C and relative air humidity does not exceed 70%. Otherwise,
failure-free operation of the compressor cannot be guaranteed. The compressor must be installed so that it
is accessible at all times for operation and maintenance. Please ensure that the appliance label is
accessible.
 The appliance must stand on a flat, sufficiently stable base. See paragraph 5 (Technical data) when
positioning or lifting the compressor.
 Compressors cannot be exposed to outdoor environments. The appliance cannot be used in moist or wet
environments. Do not use the compressor in the presence of explosive gases, dust or combustible liquids.
 Before connecting the compressor to medical equipment, the supplier must confirm that it meets all
requirements for its use. Refer to the technical data of the product for this purpose. When a unit is to be
built-in, classification and evaluation of compatibility must be done by the manufacturer or supplier of the
product to be used.
 Any use other than that described in this manual is not covered by the guarantee, and the manufacturer is
not liable for any damages that may result. The operator/user assumes all risk.
9. INSTALLATION
Only qualified personnel can install and start up the appliance and train operating
personnel in its correct use and maintenance. Installation and training of all operators
shall be confirmed by the installer’s signature on the certificate of installation.
Prior to installation, ensure that the compressor is free of all transport packaging and
stabilizers to avoid any risk of damage to the product.
Caution! When in operation, the compressor is hot. Burns or fire may result if contact is
made by the operator or any flammable material.
Electric cord for connection to electric mains and air hoses may not be broken. The power
cord may not be exposed to pulling, pressure and excessive heat.
9.1. Placement of the compressor
Fig.5
Handling
Unpacking

DK50 4VR/50
04/2018 - 13 - NP-DK50 4VR50-11_04-2018
Fig. 6
Dental compressor DK50 4VR/50 (Fig. 5)
After unpacking the equipment, position it on the floor and free it from all packing materials and remove the
fixation components (X and Y) - see Detail A. Connect the outlet pressure hose to the connector on the
device. Insert the mains plug into a rated outlet circuit.
Dental compressor DK50 4VR/50/M (Fig 5).
After unpacking the equipment, position it on the floor and free it from all packing materials and remove the
fixation components (X and Y) - see Detail A. Connect the outlet pressure hose to the connector on the
device. Insert the mains plug into a rated outlet circuit. Connect the hose(s) for the condensate drain (from
the dryer, solenoid valve and condensate line) to the condensate vessel.
Cabinet-mounted dental compressor DK50 4VR/50S (Fig. 4, Fig. 5)
After unpacking the equipment, position it on the floor and free it from all packing materials and remove the
fixation components (X and Y) - see Detail A. Install the 2 wall bump stops (27) on the upper rear portion of
the cabinet and install in the desired location. The bump stops ensure that the cabinet is properly spaced
from the wall for ventilation purposes. 2 screws must be released to install the compressor into the cabinet,
then open the door to the cabinet and detach the supporting bracket (30) in the front part of the cabinet.
Pass the pressure hose and mains plug from the compressor through the opening in the lower rear section
of the cabinet. Connect the cabinet connector (28) to the compressor and run the mains plug through the
opening in the lower rear section of the cabinet. Pick up the compressor using the handle and use the
positioning truck (32) and the installed wheels (31) to position it inside the cabinet. Install the hose (29) for
the cabinet pressure gauge (25) into the quick connectors on the compressor and reinstall the support
bracket (30) and doors. Secure the pressure hose to the device in an appropriate manner. Connect the
mains plug to a properly rated outlet circuit.
A screwdriver must be used to disconnect the cabinet
connector if the compressor is being disassembled!
(Fig.6)
Cabinet-mounted dental compressor DK50 4VR/50S/M (Fig. 4, Fig. 5)
After removing all packaging material, place the product on the floor and remove stabilization parts X and Y
(Detail A). Place the compressor into the cabinet using the procedure defined above. Before the compressor
is installed in the cabinet, the hose(s) for the condensate drain (from the dryer and solenoid valve) must be
passed through the opening on the back side of the cabinet and connected to the condensate vessel.
The condensate vessel (20) must be on the floor in order to ensure the dryer operates
properly. Otherwise the dryer may be damaged.
1 - without dryer - 061000461-000
2 – with membrane dryer MD
or DM dryer - 061000463-000

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 14 - 04/2018
Jumper position for DK50 4VR/50(M) and DK50 4VR/50S(M) compressors
The jumper in the compressor wiring box must be properly configured to ensure DK50 4VR/50(M) andDK50
4VR/50S(M) compressors operate properly. The manufacturer sets the jumper in the proper position for the
specific compressor type during production.
If the compressor is converted from DK50 4VR/50(M) configuration to DK50 4VR/50S(M), or vice versa, the
following steps must be performed:
Prior to any maintenance or repair work, switch off the compressor and disconnect it
from the mains (pull out the mains plug).
See chapter „ WIRING DIAGRAMS“ in user manual.
Jumper and blank packaged in the wiring box
A – COMPRESSOR MODIFICATION FROM DK50 4VR/50(M) TO DK50 4VR/50S(M)
- remove jumper Z (jumper off)
 remove jumper Z to eliminate the connection to terminal strip X1 (Fig. a-d)
 connect the cord to socket X2 (Fig.e) / X2, X3 - DK50 4VR/50/M(NDM) (Fig.f). once the compressor
is installed in the enclosure
a b
Z
d c

DK50 4VR/50
04/2018 - 15 - NP-DK50 4VR50-11_04-2018
B – COMPRESSORMODIFICATIONFROMDK50 4VR/50S(M) to DK50 4VR/50(M)
- install jumper Z (jumper on)
 use jumper Z (Art. 033190119-000) – to make the connection to terminal strip X1 (Fig. 1-4)
 connect the cord to socket X2 (Fig.5) / X2, X3 - DK50 4VR/50/M(NDM) (Fig.6) once the compressor
is installed in the enclosure
e f
a b
c d
Z
e f

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 16 - 04/2018
Fig.7
1
SKRINKA S50 4VR
1/N/PE ~ 230V 50/60Hz
S10
B10
1
P10
X2
40°C
E11 E12 E13E10
N23PE
PE PE
ELECTRIC OBJECT 1ST CAT.
TYPE B


Fig.8
9.2. Compressed air outlet
(Fig.7)
At the compressed air outlet (1) of the compressor, connect
the pressure hose. Connect the hose to the appliance.
9.3. Electrical connection
Plug the electrical cord into the mains.
The appliance is equipped with a grounded plug. Make sure this connection complies
with local electrical codes. The mains voltage and frequency must comply with the data
stated on the appliance label.
(Fig.8)
 Keep the socket easily accessible to ensure that in an emergency the
appliance can be safely disconnected from the mains.
 Connection to the power distribution box must be max.16 A.
 The connection of the earth ground pin  6mm (1) with other
appliances must be completed in accordance with local electrical
codes. The female socket (2), which is not included in the standard
set, is an optional accessory.
Electrical cable may not contact the hot parts of a compressor. Insulation could be
damaged!
If any electrical cord or air hose is damaged it must be replaced immediately.
10. WIRING DIAGRAMS
B10 Cabinet temperature switch
S10 Switch
E10, E11,E12,E13 Cabinet fan
P10 LED-SERVIS for NDM
X2 Cabinet connector

DK50 4VR/50
04/2018 - 17 - NP-DK50 4VR50-11_04-2018
3/N/PE ~ 400 V 50 Hz
DK50 4VR/50
MAINS TN-S [TN-C-S]
ELECTRIC OBJECT 1ST CAT.
TYPE B
-X1:1
PE
3~
2TB1
2TB2
L2
L3
N
PE PE
-F3
-X1:2
~~
h
-P1
2
N
1
3
PE
-X2
PE
Bridge
PE
PE
-M1
-X1:3
Bridge =ON => compressor without box
123 4 5
Bridge =OFF => compressor with box
2
1
4
35
2
1
4
3
6
5
04
03
A2
A1
-Q11
M
6
150°C
p >
40°C
-B1 -B2
-E1 -E2
PE
-F1
LNI1 I2 I3 I4 I5 I6 I7 I8
12121212
-B4
-M12
E_A E_B
-M11
p >
-B3
M10
12
11
1
2
-F1
-X1:1
PE
3~
2TB1
2TB2
L1
L2
L3
N
PE
-F3
PE
-X1:2
2
N
1
3
PE
-X2
PE PE PE
X3
ZELIO LOGIC
SERVICE
Q1 Q2 Q3 Q4
-M1
PE
PE
I3
I4
I5
EKOM
FLAIRMO
ABSOLUTE
TABULKA PREPOJOV
PODLA ZAKAZNIKOV
-E5
-X1:3
N
L-X3
2
1
4
35
2
1
4
3
6
5
04
03
A2
A1
-Q11
M
6
150°C
1
3
2
42
1
p >
40°C
-B1 B2
-E1 -E2
PE
-K1
3/N/PE ~ 400 V 50 Hz
MAINS TN-S [TN-C-S]
ELECTRIC OBJECT 1ST CAT.
TYPE B
DK50 4VR/50/M (NDL)
Bridge
Bridge =ON => compressor without box
Bridge =OFF => compressor with box
B1 Pressure switch
E1, E2 Compressor fan
B2 Thermo switch
M1 Compressor motor
F1 Breaker
Q11 Contactor
X1 Terminal strip
X2 Connector
F3 Fuse
P1 Hour counter
X3 Connector
B1 Pressure switch
E1, E2 Compressor fan
E5 Dryer fan
B2 Temperature switch
M1 Compressor motor
F1 Breaker
M11, M12 Solenoid valve, dryer
Q11 Contactor
X1 Terminal strip
X2 Connector
P1 Hour counter
F3 Fuse
K1 Controller
B4 Magnetic switch
B3 Pressure switch 2

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 18 - 04/2018
3/N/PE ~ 400 V 50 Hz
MAINS TN-S [TN-C-S]
ELECTRIC OBJECT 1ST CAT.
TYPE B
DK50 4VR/50/M (MD)
1
2
3
46
2
1
4
3
6
5
04
03
A2
A1
-Q11
M
5
150°C
p >
40°C
-B1 -B2
-E1 -E2
PE
-F1
-X1:1
PE
3~
2TB1
2TB2
L1
L2
L3
N
PE PE
-F3
-E5
PE
-X1:2
h
-P1
2
N
1
3
PE
-X2
PE
Bridge
PE
PE
-M1
-X1:3
~~
123 4 5
Bridge =ON => compressor without box
Bridge =OFF => compressor with box
2
6
5
7
8
9
3
1
1
1
1
11. PNEUMATIC DIAGRAM
DK50 4VR/50
1 Inlet filter
2 Compressor
3 Fan
5 Safety valve
6 Check valve
7 Pressure switch
8 Air tank
9 Pressure gauge
10 Dryer outlet solenoid valve
11 Cooler
12 Cooler fan
13 -
14 Pressure relief valve
15 -
16 Dryer
17 Jet
18 Filter
19 Mikrofilter
20 Vessel
B1 Pressure switch
E1, E2 Compressor fan
E5 Dryer fan
B2 Temperature switch
M1 Compressor motor
F1 Breaker
F3 Fuse
Q11 Contactor
X1 Terminal strip
X2 Connector
P1 Hour counter

DK50 4VR/50
04/2018 - 19 - NP-DK50 4VR50-11_04-2018
7
8
9
10
5
16
10
3
11
12
14
1
1
1
1
2
7
8
9
5
16
18 19
20
6
6
3
11
12
14
1
1
1
1
2
DK50 4VR/50/M
(NDM)
DK50 4VR/50/M
(MD)
12. FIRST OPERATION
Make sure that all stabilizers used during transport were removed.
 Check that all pressurized air line connections are secure.
 Connect to the mains.
 Start compressor at pressure switch (2) by turning switch (3) to position “I.“(Fig.9)
 For cabinet-mounted compressors, turn the switch (26) in Fig. 4 on the front side of the equipment cabinet
into the "I" position; a lighted switch indicates the equipment is in operation.
 Compressor - At first operation the air tank is pressurized until it reaches a preset level when the
compressor automatically switches off. As the air is used, the compressor works in automatic mode,
switched on or off by the pressure switch.
 Compressor with dryer – Compressor operation is the same and the moisture from the compressed air is
removed as it passes through the dryer.
For NDM - the condensate is also blown out of the drain on the dryer, which can be heard as a brief whoosh
sound when the compressor shuts down or when the drying chambers switch.
The compressor is not equipped with an emergency power supply.

DK50 4VR/50
NP-DK50 4VR50-11_04-2018 - 20 - 04/2018
OPERATION
In case of emergency, disconnect the compressor from the mains (pull out the mains
plug).
The compressor has hot surfaces.
Burns or fire may result if contact is made.
During prolonged operation of the compressor, the temperature in the box may increase
to over 40°C. At this point the cooling fan automatically switches on. After cooling the
space to under 32°C, the ventilator switches off.
Automatic start: when pressure in the tank drops to the pressure switch’s lower limit
level, the compressor automatically switches on. The compressor automatically
switches off after reaching the pressure switch’s upper limit level.
Compressor with dryer
A correct function of the drier depends on the compressor’s operation and no attendance is required. The
pressure vessel need not be sludged, because the pressure air entering the air chamber is already dried.
- It is forbidden to alter the working pressures of pressure switch set by manufacturer. The operation
of the compressor at working pressure lower than the switching pressure demonstrates the overload
of the compressor (high air consumption) by the appliance, leakages in pneumatic distributions,
failure of aggregate or drier.
- Prior connecting drier to air chamber, that was used with compressor without drier, it is necessary to
clean interior surface of air chamber and perfectly remove condensed liquid. Then interconnect
electric part of drier with compressor according to wiring diagram in accord with valid regional
regulations.
Required drying performance can only be achieved when following the defined operating
conditions!
Drying performance will decline and the achieved dew point will drop if the dryer is
operated at any pressure below the minimum working pressure!
Dryer operation at a pressure of 0.5 Bar below the minimum working pressure can lower
the dew point at the outlet by more than 10°C!
The dryer will be irrevocably damaged and need replacement if operated at any
temperature above the maximum working temperature
13. SWITCHING THE COMPRESSOR ON
(Fig.9)
Switch on the compressor at the pressure switch (2) by turning the
knob (3) to position “I.” (for compressor in the box switch (26) Fig.4), on
the front part of the compressor box), The compressor sends
pressurized air to the air tank. As the compressed air is used, the
pressure in the air nozzle drops to a preset level, the compressor
switches on and the air nozzle files with compressed air. After
reaching the cutoff pressure the compressor turns off automatically and
the cycle is repeated. Check the value of switching-on and switching-
off pressure on pressure gauge. The values may be within a tolerance
of 10%. Air pressure in air chamber must not exceed maximal
permitted operation pressure.
Never tamper with the pressure switch (2). Adjustments are not allowed. The pressure
switch (2) has been set by the manufacturer and further setting of switching on and off
pressure may be carried out only by a qualified expert trained by the manufacturer.
Fig.9
3
5
2
14


