Vents VKV User manual

USER’S MANUAL
VKV
VKH
Centrifugal roof fan

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CONTENTS
This user’s manual is a main operating document intended for technical, maintenance, and operating staff.
The manual contains information about purpose, technical details, operating principle, design, and installation of the VKV/VKH unit and
all its modifications.
Technical and maintenance staff must have theoretical and practical training in the field of ventilation systems and should be able to
work in accordance with workplace safety rules as well as construction norms and standards applicable in the territory of the country.
Safety requirements..................................................................................................................................................................... 2
PURPOSE............................................................................................................................................................................................. 4
Delivery set........................................................................................................................................................................................ 4
Designation key.............................................................................................................................................................................. 4
Technical data.................................................................................................................................................................................. 5
Mounting and set-up.................................................................................................................................................................. 8
Connection to power mains .................................................................................................................................................. 10
Commissioning............................................................................................................................................................................... 14
Technical maintenance.............................................................................................................................................................. 15
Storage and transportation regulations.......................................................................................................................... 18
Manufacturer’s warranty........................................................................................................................................................... 19
Certificate of acceptance.......................................................................................................................................................... 23
Seller information.......................................................................................................................................................................... 23
Installation certificate.................................................................................................................................................................. 23
Warranty card................................................................................................................................................................................... 23
SAFETY REQUIREMENTS
All user’s manual requirements as well as the provisions of all the applicable local and national
construction, electrical, and technical norms and standards must be observed when installing
and operating the unit.
Disconnect the unit from the power supply prior to any connection, servicing, maintenance, and
repair operations.
Only qualied electricians with a work permit for electrical units up to 1000 V are
allowed for installation. The present user’s manual should be carefully read before
beginning works.
Check the unit for any visible damage of the impeller, the casing, and the grille before starting
installation. The casing internals must be free of any foreign objects that can damage the
impeller blades.
While mounting the unit, avoid compression of the casing! Deformation of the casing may result
in motor jam and excessive noise.
Misuse of the unit and any unauthorised modifications are not allowed.
Transported air must not contain any dust or other solid impurities, sticky substances, or fibrous
materials.
Do not use the unit in a hazardous or explosive environment containing spirits, gasoline,
insecticides, etc.
Do not close or block the intake or extract vents in order to ensure the efficient air flow.

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Connection to the mains must be made through a disconnecting device, which is integrated
into the fixed wiring system in accordance with the wiring rules for design of electrical units,
and has a contact separation in all poles that allows for full disconnection under overvoltage
category III conditions.
Do not sit on the unit and do not put objects on it.
The information in this user’s manual was correct at the time of the document’s preparation.
The Company reserves the right to modify the technical characteristics, design, or configuration
of its products at any time in order to incorporate the latest technological developments.
Never touch the unit with wet or damp hands.
Never touch the unit when barefoot.
If the supply cord is damaged, it must be replaced by the manufacturer, its service agent, or
similarly qualified persons in order to avoid a safety hazard.
Ensure that the unit is switched off from the supply mains before removing the guard.
WARNING: If there are any unusual oscillating movements, immediately stop using the unit and
contact the manufacturer, its service agent or suitably qualified persons.
The replacement of parts of the safety suspension system device shall be performed by the
manufacturer, its service agent or suitably qualified persons.
Precautions must be taken to avoid the back-flow of gases into the room from the open flue of
gas or other fuel-burning appliances.
The manufacturer, designer, installer and operator are responsible for the correct operation and
functioning of the unit.
THE PRODUCT MUST BE DISPOSED SEPARATELY AT THE END OF ITS
SERVICE LIFE.
DO NOT DISPOSE THE UNIT AS UNSORTED DOMESTIC WASTE
This unit is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the unit by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the unit.
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in a safe way and understand
the hazards involved.
Cleaning and user maintenance shall not be made by children without supervision.
Children shall not play with the appliance.

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THE UNIT SHOULD NOT BE OPERATED BY CHILDREN OR PERSONS WITH REDUCED
PHYSICAL, MENTAL, OR SENSORY CAPACITIES, OR THOSE WITHOUT THE APPROPRIATE
TRAINING.
THE UNIT MUST BE INSTALLED AND CONNECTED ONLY BY PROPERLY QUALIFIED
PERSONNEL AFTER THE APPROPRIATE BRIEFING.
THE CHOICE OF UNIT INSTALLATION LOCATION MUST PREVENT UNAUTHORISED
ACCESS BY UNATTENDED CHILDREN.
NAME NUMBER
Fan 1 pc.
User’s manual 1 pc.
Packing box 1 pc.
The VKV/VKH roof fans in metal casing are designed for ventilation systems in industrial premises as well as pools, apartment buildings,
offices, hospitals, restaurants and other premises heated during the winter season.
The fan is mounted on the exhaust shaft of the air duct and is used only for exhaust ventilation.
Designation example: VKV z X X 310 S1
Centrifugal roof fan
VKV — with vertical air discharge
VKH — with horizontal air discharge
Casing material
z — galvanized steel
_ — polymer-coated steel
A — aluminium
Number of motor poles
2, 4, 6
E — single-phase
D — three-phase
Turbine standard size [mm]
Options
S1 — built-in external switch
PURPOSE
DELIVERY SET
DESIGNATION KEY

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The unit is rated as a Class I electrical appliance.
VKHVKV
TECHNICAL DATA
D*
H
L
A
d
B
C
M
H
H1
C
B
d
M
D*
A
∅D* – flange connection dimensions.

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Model
Overall and connecting dimensions [mm] Weight
[kg]
H [mm] A [mm] B [mm] C [mm] D [mm] d [mm]
(4 holes)
M [mm]
(6 places) L [mm]
VKV 2E 190 170 417 355 245 213 9 M6 480 7
VKV 2E 220 190 417 355 245 213 9 M6 480 7
VKV 2E 225 215 417 355 245 210 9 M6 480 7
VKV 4E 225 215 417 355 245 210 9 M6 480 7
VKV 2E 250 240 481 425 330 285 11 M6 540 9
VKV 4E 250 240 481 425 330 285 11 M6 540 9
VKV 4E 280 276 547 425 330 291 11 M6 600 13
VKV 2E 310 276 547 425 330 285 11 M6 600 13
VKV 4E 310 300 613 477 330 285 11 M6 670 20
VKV 4D 310 300 613 477 750 285 11 M6 670 19
VKV 4E 355 330 738 598 450 438 11 M8 790 26
VKV 4D 355 330 738 598 450 438 11 M8 790 26
VKV 4E 400 375 738 598 450 438 11 M8 790 33
VKV 6E 400 375 738 598 450 438 11 M8 790 31
VKV 4D 400 375 738 598 450 438 11 M8 790 33
VKV 4E 450 430 738 668 535 438 11 M8 790 41
VKV 6E 450 430 738 668 535 438 11 M8 790 41
VKV 4D 450 425 738 668 535 438 11 M8 790 41
VKV 6E 500 460 859 668 535 445 11 M8 910 52
VKV 4D 500 460 859 668 535 430 11 M8 910 52
VKV 6D 500 460 859 668 535 445 11 M8 910 52
VKV 6E 560 485 859 833 750 605 11 M8 910 63
VKV 4D 560 485 859 833 750 605 11 M8 910 63
VKV 6D 560 485 859 833 750 605 11 M8 910 63
VKV 6D 630 485 951 939 750 600 20 M8 1000 81
VKV 6D 710 485 992 980 840 674 20 M8 1040 114
Model
Overall and connecting dimensions [mm] Weight
[kg]
H [mm] H1 [mm] A [mm] B [mm] C [mm] D [mm] d [mm]
(4 holes)
M [mm]
(6 places)
VKH 2E 190 189 195 351 350 245 213 11 M6 8
VKH 2E 220 180 186 337 338 245 213 11 M6 8
VKH 2E 225 210 217 351 350 245 210 11 M6 9
VKH 4E 225 233 240 351 350 245 210 11 M6 9
VKH 2E 250 237 244 451 450 330 285 11 M6 12.7
VKH 4E 250 237 244 451 450 330 285 11 M6 12.1
VKH 4E 280 265 272 451 450 330 291 11 M6 13.5
VKH 2E 310 251 258 451 450 330 291 11 M6 13.2
VKH 4E 310 287 294 451 450 330 285 11 M6 14.2
VKH 4D 310 287 294 451 450 330 285 11 M6 14.2
VKH 4E 355 322 361 625 620 450 438 11 M8 28.3
VKH 4D 355 347 386 625 620 450 438 11 M8 30.3
VKH 4E 400 376 415 625 620 450 438 11 M8 35
VKH 6E 400 376 415 625 620 450 438 11 M8 32.7
VKH 4D 400 376 415 625 620 450 438 11 M8 35
VKH 4E 450 420 459 710 700 535 438 11 M8 46.6
VKH 6E 450 420 459 710 700 535 438 11 M8 45.6
VKH 4D 450 420 459 710 700 535 438 11 M8 45.5
VKH 6E 500 461 501 710 700 535 445 11 M8 52.8
VKH 4D 500 490 530 710 700 535 430 11 M8 46.6
VKH 6D 500 461 501 710 700 535 445 11 M8 52.7
VKH 6E 560 489 528 900 895 750 605 11 M8 76.4
VKH 4D 560 489 528 900 895 750 605 11 M8 81.4
VKH 6D 560 489 528 900 895 750 605 11 M8 76.4
VKH 6D 630 520 560 1000 990 750 600 20 M8 96.3
VKH 6D 710 570 619 1060 1050 840 674 20 M8 134

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VKV/VKH
2E 190
VKV/VKH
2E 220
VKV/VKH
2E 225
VKV/VKH
4E 225
VKV/VKH
2E 250
VKV/VKH
4E 250
Voltage [V] 1~ 230 1~ 230 1~ 230 1~ 230 1~ 230 1~ 230
Frequency [Hz] 50 60 50 60 50 60 50 50 60 50
Power [W] 69 89 108 118 123 169 49 184 232 48
Current [A] 0.30 0.40 0.49 0.54 0.54 0.70 0.22 0.81 0.90 0.23
Max. air flow [m³/h] 610 654 880 883 915 1010 738 1450 1320 820
RPM [min-1]2680 2980 2580 2840 2790 2820 1400 2480 2320 1440
Sound pressure level at 3 m distance [dBA] 48 49 50 51 51 52 45 54 53 46
Transported air temperature [°C] -25...+50
SEC class* C - C - C - C - - -
Ingress protection rating IPX4
VKV/VKH
4E 280
VKV/VKH
2E 310
VKV/VKH
4E 310
VKV/VKH
4D 310
VKV/VKH
4E 355
VKV/VKH
4D 355
Voltage [V] 1~ 230 1~ 230 1~ 230 3~ 400 1~ 230 3~ 400
Frequency [Hz] 50 60 50 50 60 50 60 50 60 50 60
Power [W] 125 155 324 141 195 155 202 219 304 264 330
Current [A] 0.61 0.99 1.42 0.64 0.87 0.29 0.32 0.96 1.33 0.58 0.64
Max. air flow [m³/h] 1490 1520 2150 2265 2425 2300 2442 2480 2976 3290 3540
RPM [min-1]1446 1710 2620 1420 1740 1410 1550 1420 1580 1430 1650
Sound pressure level at 3 m distance [dBA] 46 46 58 47 49 47 48 51 52 52 53
Transported air temperature [°C] -25...+50 -30...+60
Ingress protection rating IPX4
VKV/VKH
4E 400
VKV/VKH
6E 400
VKV/VKH
4D 400
VKV/VKH
4E 450
VKV/VKH
6E 450
VKV/VKH
4D 450
VKV/VKH
4D 500
Voltage [V] 1~ 230 1~ 230 3~400 1~ 230 1~ 230 3~400 3~400
Frequency [Hz] 50 50 60 50 50 50 50 50
Power [W] 457 184 249 420 749 268 755 1527
Current [A] 2.00 0.89 1.10 0.99 3.35 1.25 1.50 2.64
Max. air flow [m³/h] 3950 2740 3289 3950 6180 4380 5920 8435
RPM [min-1]1440 945 1071 1440 1400 940 1440 1460
Sound pressure level at 3 m distance [dBA] 55 47 49 55 58 50 57 62
Transported air temperature [°C] -30...+60 -30...+50
Ingress protection rating IPX4
VKV/VKH
6E 500
VKV/VKH
6D 500
VKV/VKH
4D 560
VKV/VKH
6E 560
VKV/VKH
6D 560
VKV/VKH
6D 630
VKV/VKH
6D 710
Voltage [V] 1~230 3~400 3~400 1~230 3~400 3~400 3~400
Frequency [Hz] 50 60 50 60 50 50 50 50 50
Power [W] 407 673 440 599 1970 613 696 1110 2583
Current [A] 1.81 3.05 1.23 1.32 3.36 2.70 1.44 2.42 4.87
Max. air flow [m³/h] 5680 6532 6000 6122 13560 9560 9630 12640 17010
RPM [min-1] 970 1120 978 1125 1400 930 970 957 945
Sound pressure level at 3 m distance [dBA] 52 54 52 54 66 58 58 64 67
Transported air temperature [°C] -25...+60 -25...+50 -25...+70
Ingress protection rating IPX4

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WHILE INSTALLING THE UNIT ENSURE CONVENIENT ACCESS FOR SUBSEQUENT
MAINTENANCE AND REPAIR.
BEFORE MOUNTING MAKE SURE THE CASING DOES NOT CONTAIN ANY FOREIGN
OBJECTS E.G. FOIL, PAPER.
MOUNTING AND SETUP
• Fans are designed for horizontal mounting on a flat roof directly above an air duct or a ventilation shaft.
• In order to avoid ingress of water and snow into the ventilation duct, it is possible to install a fan on the mounting frame.
• The fan is connected to the ventilation duct by means of a counter flange, which is attached directly to the fan base.
• The fan base has holes for fixing bolts that attach the fan to a stationary even surface or to a mounting frame.
• In the VKV 2E 200, VKV 2E 225, VKV 4E 225, VKV 4E 310, VKV 4D 310, VKV/VKH 6E 500, VKV/VKH 4D 500, VKV/VKH 6D 500, VKV/VKH 6D
630, VKV/VKH 6D 710 models the counter flange is attached together with the fan inlet ring.
• A mounting frame, a counter flange and mounting bolts are not included in the delivery set and must be purchased separately.
VKV
VKH
OPERATION OF FANS WITHOUT A CONNECTED AIR DUCT SYSTEM IS IMPROPER

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1 – roof fan; 2 – GKV flexible insert; 3 – KKV backdraft damper; 4 – FKV counter flange; 5 – RKV or RKVI mounting frame; 6 – air duct.
INSTALLATION CHART
INSTALLATION EXAMPLES
Roof fan base
Insulation
Roof design
FKV counter flange
KKV backdraft damper
GKV flexible insert
Air duct
3
5
4
6
2
4
5
6
3
2
5
4
6
1 1

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• The unit is rated for connection to power mains with the parameters specified in the "Technical data”section, according to the wiring
diagram.
• The connection must be made using insulated conductors (cables, wires). The actual wire cross section selection must be based
on the maximum load current, maximum conductor temperature depending on the wire type, insulation, length and installation
method.
• The unit should be connected to the fixed wiring system in compliance with current regulations.
Connection to power mains should be made inside the terminal box located on the fan casing, according to the wiring diagram and
terminal designation. The terminal designations are shown on the label inside the terminal box. Fan electrical data is shown on the
label on the fan casing.
Depending on modication, the fan motors can have no built-in thermal protection. This should be taken into account when
choosing a motor starter or a contactor.
ACCESS TO THE TERMINAL BLOCK VKV
ACCESS TO THE TERMINAL BLOCK VKH
DISCONNECT THE POWER SUPPLY PRIOR TO ANY OPERATIONS WITH THE UNIT.
CONNECTION OF THE UNIT TO POWER MAINS IS ALLOWED BY A QUALIFIED
ELECTRICIAN WITH A WORK PERMIT FOR THE ELECTRIC UNITS UP TO 1000 V AFTER
CAREFUL READING OF THE PRESENT USER’S MANUAL.
THE RATED ELECTRICAL PARAMETERS OF THE UNIT ARE GIVEN ON THE
MANUFACTURER’S LABEL.
CONNECTION TO POWER MAINS
ANY TAMPERING WITH THE INTERNAL CONNECTIONS IS PROHIBITED
AND WILL VOID THE WARRANTY.

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Power supply parameters and examples of wiring diagrams depending on the unit model
Wiring diagram 1: VKV/VKH 2E 190, VKV/VKH 2E 220, VKV/VKH 2E 225, VKV/VKH 4E 225, VKV/VKH 2E 250, VKV/VKH 4E 250, VKV/VKH 4E 280,
VKV/VKH 2E 310, VKV/VKH 4E 310, VKV/VKH 4E 355, VKV/VKH 4E 400, VKV/VKH 6E 400, VKV/VKH 4E 450, VKV/VKH 6E 450
Depending on modification, the fans can have thermal contacts. Then it is necessary to use the wiring diagram 5 instead of the wiring
diagram 1.
Wiring diagram 2: VKV/VKH 4D 355.
Wiring diagram 3: VKV/VKH 4D 310, VKV/VKH 4D 400, VKV/VKH 4D 450, VKV/VKH 4D 500, VKV/VKH 4D 560.
Wiring diagram 4: VKV/VKH 6D 710.
Wiring diagram 5: VKV/VKH 6E 500, VKV/VKH 6E 560.
Wiring diagram 6: VKV/VKH 6D 500, VKV/VKH 6D 560, VKV/VKH 6D 630.
FQ
L
N
N
L
EP
3L
1L
2L
1L
3L
2L
EP
FQ
2L
1L
3L
KT
KT
2L
3L
1L
FQ
EP
kT
kT
123
FQ
3L
1L
2L
KT
KT
kT
kT
EP
1L
3L
2L
N
L
KT
KT
L
N
kT
FQ
kT
EP
KT
kT
kT
2V
2U
2W
1V
1
U
1W
KT
2L
3L
1L
EP
FQ
456
WIRING DIAGRAM DESIGNATIONS:
L(x): phase; N: neutral; QF: automatic circuit breaker; PE: protective ground wire; TK: motor thermal protection contacts.

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Model Voltage [V] Frequency [Hz] Current [A]
Recommended rated
current of the automatic
circuit breaker.
Type D, [A]
Recommended cable, nxS,
where n is the number of
wires, and S is the cross
section in mm2
VKV/VKG 2E 190 1~ 230 50 0,30 0,5 3x0,75
VKV/VKG 2E 190 1~ 230 60 0,40 0,5 3x0,75
VKV/VKG 2E 220 1~ 230 50 0,49 1 3x0,75
VKV/VKG 2E 220 1~ 230 60 0,54 1 3x0,75
VKV/VKG 2E 225 1~ 230 50 0,54 1 3x0,75
VKV/VKG 2E 225 1~ 230 60 0,70 1 3x0,75
VKV/VKG 4E 225 1~ 230 50 0,22 0,5 3x0,75
VKV/VKG 2E 250 1~ 230 50 0,81 1 3x0,75
VKV/VKG 2E 250 1~ 230 60 0,90 1 3x0,75
VKV/VKG 4E 250 1~ 230 50 0,23 0,5 3x0,75
VKV/VKG 4E 280 1~ 230 50 0,61 1 3x0,75
VKV/VKG 4E 280 1~ 230 60 0,99 2 3x0,75
VKV/VKG 2E 310 1~ 230 50 1,42 2 3x0,75
VKV/VKG 4E 310 1~ 230 50 0,64 1 3x0,75
VKV/VKG 4E 310 1~ 230 60 0,87 1 3x0,75
VKV/VKG 4D 310 3~ 400 50 0,29 0,5 4x0,75
VKV/VKG 4D 310 3~ 400 60 0,32 0,5 4x0,75
VKV/VKG 4E 355 1~ 230 50 0,96 2 3x0,75
VKV/VKG 4E 355 1~ 230 60 1,33 2 3x0,75
VKV/VKG 4D 355 3~ 400 50 0,58 1 4x0,75
VKV/VKG 4D 355 3~ 400 60 0,64 1 4x0,75
VKV/VKG 4E 400 1~ 230 50 2,00 3 3x1
VKV/VKG 6E 400 1~ 230 50 0,89 1 3x0,75
VKV/VKG 6E 400 1~ 230 60 1,10 2 3x0,75
VKV/VKG 4D 400 3~ 400 50 0,99 2 4x0,75
VKV/VKG 4E 450 1~ 230 50 3,35 4 3x1,5
VKV/VKG 6E 450 1~ 230 50 1,25 2 3x0,75
VKV/VKG 4D 450 3~ 400 50 1,50 2 4x0,75
VKV/VKG 4D 500 3~ 400 50 2,64 3 4x1
VKV/VKG 6E 500 1~ 230 50 1,81 2 3x0,75
VKV/VKG 6E 500 1~ 230 60 3,05 4 3x1
VKV/VKG 6D 500 3~ 400 50 1,23 2 4x0,75
VKV/VKG 6D 500 3~ 400 60 1,32 2 4x0,75
VKV/VKG 4D 560 3~ 400 50 3,36 4 4x1,5
VKV/VKG 6E 560 1~ 230 50 2,70 3 3x1
VKV/VKG 6D 560 3~ 400 50 1,44 2 4x0,75
VKV/VKG 6D 630 3~ 400 50 2,42 3 4x1
VKV/VKG 6D 710 3~ 400 50 4,87 6 4x1,5

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ASYNCHRONOUS ELECTRIC MOTOR STARTING METHODS
There are several methods for starting asynchronous squirrel-cage electric motors.
The most common methods are: direct-on-line (DOL), with a soft starter (SS) or with a frequency converter (FC).
Direct-on-line starting
In case of direct-on-line starting (i.e. by connecting the motor to the electric mains with a simple line contactor), the motor starting
time significantly increases due to high inertia of the impeller, which, in turn, results in high in-rush starting currents in the circuit. These
currents of long duration may cause voltage slumps (especially if the feed line section falls short of the requirements), which may affect
load operation.
The in-rush current consumed by an electric motor in case of DOL starting is 5-8 times larger than the rated value (or even 10-14 times
larger in some rare instances). It should be noted that the torque developed by the motor also significantly exceeds the rated value.
Upon energisation the motor operates as a transformer with a squirrel-cage secondary winding formed by the rotor cage with a very low
resistance.
The rotor develops high induced current causing a rush of current in the feed line.
The startup torque during starting averages 0.5-1.5 of the rated torque value.
Despite such advantages as simple construction, high startup current, quick start and low cost, direct-on-line systems are suitable only
in the following cases:
• the motor power is low compared to the mains power which limits the adverse effect of the rush of current
• the driven mechanism does not require gradual speed build-up or is equipped with a damping device to smooth out the inrush
• the high startup torque has no adverse effects on the operation of the driven mechanism
Soft start. SS starting.
A soft starter gradually increases the voltage supplied to the motor – from the initial to the rated value.
This starting system can be used to meet the following goals:
• limit the motor current
• regulate the torque
Regulation by limiting the current sets the maximum in-rush current equal to 300-400 % (or 250 % in some rare instances) of the rated
current and reduces torque characteristics. This type of regulation is especially suited for turbomachinery such as centrifugal pumps and
fans.
Regulation by variation of torque optimizes the torque during startup and reduces in-rush current in the circuit. These conditions are
suitable for mechanisms with constant load resistance.
This type of soft starting may differ in the implementation pattern:
• motor start
• motor start and stop
• device bridging at the end of start sequence
• start and stop of several motors in stage circuits
Soft start. FC starting.
During the starting the FC raises the frequency from 0 Hz to the electrical mains frequency (50 or 60 Hz). As the frequency is increased
gradually, the motor can be assumed to operate at its rated speed for a given frequency value. Furthermore, on the assumption that the
motor runs at its rated speed the nominal torque should be immediately available whereas the current will be approximately equal to
the rated value.
This starting system is used for speed control and regulation and can be used in the following cases:
• start with high-inertia load
• start with high load and limited-capacity power supply source
• optimization of electric power consumption depending on turbomachinery speed
The aforementioned starting system can be used for all types of mechanisms.
MAKE SURE THAT THE FAN IMPELLER ROTATES IN THE DIRECTION MARKED BY THE
ARROW ON THE FAN CASING.
IF NECESSARY, CHANGE THE IMPELLER ROTATION DIRECTION BY ALTERING THE PHASE
SEQUENCE ON THE ELECTRIC MOTOR TERMINALS.

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Problems associated with DOL starting
The problems caused by DOL starting may be divided into two groups:
1. An abrupt start causes mechanical shock, jolts in the mechanism, shock removal of free play etc.
2. A heavy start cannot be completed.
Let us review three variations of a heavy start:
1. The feed line performance is barely sufficient or insufficient to maintain the induced current.
Typical symptoms: Upon starting the circuit breakers at the system input are tripped; the lights, certain relays and contactors go off,
and the supply generator shuts down.
Solution: In the best-case scenario an SS device may help reduce the in-rush current to 250 % of the motor rated current. If this is
insufficient, an FC is necessary.
2. The motor cannot start the mechanism with DOL starting.
Typical symptoms: The motor fails to turn or“freezes”at certain speed which is maintained until actuation of the protection suite.
Solution: This problem may not be solved with an SS device. The motor develops insufficient shaft torque. However, this problem can
be addressed by using an FC, but each case may be different.
3. The motor spins up the mechanism with authority, but fails to reach the rated rotation speed.
Typical symptoms: The input automatic circuit breaker is tripped during spin-up. This often happens with heavy-weight fans with a
considerable rotation speed.
Solution: Such problems may be addressed with an SS device, but not with 100 % certainty. The closer the motor speed to the rated
value during the actuation of the protective equipment, the higher the chances of success. The use of an FC in this case helps solve the
problem fundamentally.
Standard switching equipment (automatic circuit breakers, contactors and motor starters) is not designed to withstand
prolonged overloads normally causing the fan to shut down automatically DOL starting that continues for a long period of
time.
Using switching equipment with a higher maximum current rating renders the electric motor protection system less sensitive.
As a result the switching equipment will not be able to detect motor overload in time due to a high current sensing threshold.
Such problems as mentioned above can only be addressed by utilizing a soft starter or a frequency converter to start the fan.
COMMISSIONING
THE ORGANISATION RESPONSIBLE FOR THE COMMISSIONING SHALL BE RESPONSIBLE
FOR PROPER MOTOR PHASING AND STARTING PATTERN SELECTION.
• After fan starting make sure that the electric motor rotates properly without undue vibration and abnormal noise.
• Make sure that the fan impeller rotates in the direction marked by the arrow on the fan casing. If necessary, change the rotation
direction of the impeller by reversing the phase sequence (for a three-phase motor) or by rewiring according to the wiring diagram
located inside the terminal box (for a single-phase motor).
• Make sure that the fan energy consumption complies with the value given on the equipment nameplate and check the motor for
overheating.
• The phase current should be checked once the fan reaches the rated operating conditions.
• Do not switch the fan on and off several times without pauses as this may result in damage to the winding or insulation due to
overheating.
DURING STARTING THE INRUSH CURRENTS OF THE FAN MAY SEVERAL TIMES EXCEED
THE RATED VALUES.
SEE“ASYNCHRONOUS ELECTRIC MOTOR STARTING METHODS” IN THE“CONNECTION
TO POWER MAINS” SECTION
In conditions of low temperatures and high humidity, in order to avoid freezing or water ingress into the duct, the unit must
be operated continuously.

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• The technical maintenance includes periodic cleaning of the surfaces from accumulated dust and dirt.
• When carrying out fan maintenance, it is necessary to partially disassemble it in order to access contaminated parts of the fan.
• The impeller blades require thorough cleaning once in 6 months.
• Use a soft dry cloth, brush or compressed air to remove dust.
• Carry out wet cleaning using warm water and a mild household detergent.
• Protect the electric motor against liquid ingress.
• Do not immerse the unit in water!
• Do not use aggressive solvents, or sharp objects as they may damage the impeller.
VKV
TECHNICAL MAINTENANCE
DISCONNECT THE UNIT FROM POWER SUPPLY BEFORE ANY MAINTENANCE
OPERATIONS!
MAKE SURE THE UNIT IS DISCONNECTED FROM POWER MAINS BEFORE REMOVING
THE PROTECTION
AVOID LIQUID SPILLS ON THE MOTOR! DO NOT USE AGGRESSIVE SOLVENTS AND
SHARP OBJECTS FOR CLEANING!
PRIOR TO COMMENCING ANY TECHNICAL MAINTENANCE PUT UP A PROHIBITORY
SIGN ON THE FAN STARTING PANEL:
“DO NOT SWITCH ON! MEN AT WORK!”

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VKV/VKH
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VKV 2E 190, VKV 2E 220, VKV 2E 225, VKV 4E 225, VKV 2E 250, VKV 4E 250, VKV 4E 280, VKV 2E 310, VKV 4E 310, VKV 4D 310,
VKV 4E 355, VKV 4D 355
with a hinged cover and a motor
VKH

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TROUBLESHOOTING
Problem Possible reasons Elimination
The fan will not start. No power supply. Check the mains switch. Check the electrical connections
according to the wiring diagram.
Jammed motor. Carefully check the fan impeller for possible seizure and
eliminate it, if necessary. If the impeller is in order, replace
the electric motor.
The switching equipment
activates upon fan start-up.
Short circuit in the fan or the electric circuit between
the fan and the switching equipment.
Eliminate the cause of a short circuit.
Excessive current consumption due to an overload in
the electric mains.
Eliminate the cause of excessive current consumption.
Improper fan starting method.
Use a soft starter or frequency converter to start the motor
(see "Asynchronous Electric Motor Starting Methods"
in the " Connection to power mains " section).
Improper switching equipment. Re-select the switching equipment in accordance with the
current regulations and equipment specifications.
The installed switching equipment is of poor quality
or its actual performance falls short of the rated values
stated by the manufacturer.
Re-select the switching equipment by choosing a unit
which successfully passed commutation and load tests
and has a technical compliance certificate. The selection
should be limited to the top five foreign switching
equipment manufacturers.
The fan fails to reach the
required rotation speed due to
serious overheating of the fan
motor.
Fan motor overloaded. Eliminate the overload.
Improper fan starting method. Use a soft starter or frequency converter to start the motor
(see “Asynchronous Electric Motor Starting Methods”
in the“Connection to power mains” section).
The fan motor runs at
overload capacity with current
consumption in excess of the
rated value.
The fan supplies more air than expected upon motor
capacity selection.
Measure network resistance. Throttle down the network
(add aerodynamic resistance to the air duct network).
Wrong motor phasing. The impeller rotates in the
opposite direction of the arrow on the fan casing.
If necessary, change the impeller rotation direction by
changing the phase sequence on the electric motor
terminals.
Air ducts clogged. Clean the air duct or the impeller.
The fan supplies more air than
expected.
The resistance values used during the ventilation
network calculations are too conservative.
Check the air ducts for proper shape and cross section as
well as for any dampers present.
The cross section of air ducts increased and their
number reduced during the installation.
Throttle down the network (add aerodynamic resistance
to the air duct network).
Wrong choice of the fan. Replace the fan with a unit of proper standard size.

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VKV/VKH
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STORAGE AND TRANSPORTATION REGULATIONS
• Store the unit in the manufacturer’s original packaging box in a dry closed ventilated premise with temperature range
from +5 ˚C to +40 ˚C and relative humidity up to 70 %.
• Storage environment must not contain aggressive vapors and chemical mixtures provoking corrosion, insulation, and sealing
deformation.
• Use suitable hoist machinery for handling and storage operations to prevent possible damage to the unit.
• Follow the handling requirements applicable for the particular type of cargo.
• The unit can be carried in the original packaging by any mode of transport provided proper protection against precipitation and
mechanical damage. The unit must be transported only in the working position.
• Avoid sharp blows, scratches, or rough handling during loading and unloading.
• Prior to the initial power-up after transportation at low temperatures, allow the unit to warm up at operating temperature for at least
3-4 hours.
The fan supplies less air than
expected.
Wrong calculation of the ventilation network and
wrong selection of the fan.
Re-calculate the network parameters and select a
matching fan.
The network resistance exceeds the design
calculations.
Re-arrange the ventilation network to decrease its
aerodynamic resistance.
Wrong direction of the impeller rotation.
If necessary, change the impeller rotation direction by
changing the phase sequence on the electric motor
terminals (see the “Commissioning” section).
Air leak through a loose air duct connection. Eliminate the air leak. Seal the air duct connection.
Impeller or air duct contamination with foreign
objects or debris.
Clean the impeller or the air ducts from foreign objects or
debris.
Excessive noise or vibration both
inside the fan and in the circuit.
Loose screw connections. Check the screw connections for proper tightness.
No flexible joints between the fan and the ventilation
network on the suction and discharge sides.
Install flexible joints.
Loose connection of valves and dampers to the air
ducts.
Tighten up the fasteners of valves and dampers.
Impeller or air duct contamination with foreign
objects or debris.
Clean the impeller or the air ducts from foreign objects or
debris.
Worn bearings. Replace the bearings.
Unstable power supply, unstable motor operation. Check the stability of power supply parameters and
electric motor operation.

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MANUFACTURER’S WARRANTY
The product is in compliance with EU norms and standards on low voltage guidelines and electromagnetic compatibility. We hereby
declare that the product complies with the provisions of Electromagnetic Compatibility (EMC) Directive 2014/30/EU of the European
Parliament and of the Council, Low Voltage Directive (LVD) 2014/35/EU of the European Parliament and of the Council and CE-marking
Council Directive 93/68/EEC. This certificate is issued following test carried out on samples of the product referred to above.
The manufacturer hereby warrants normal operation of the unit for 24 months after the retail sale date provided the user's observance
of the transportation, storage, installation, and operation regulations. Should any malfunctions occur in the course of the unit operation
through the Manufacturer's fault during the guaranteed period of operation, the user is entitled to get all the faults eliminated by the
manufacturer by means of warranty repair at the factory free of charge. The warranty repair includes work specific to elimination of faults
in the unit operation to ensure its intended use by the user within the guaranteed period of operation. The faults are eliminated by means
of replacement or repair of the unit components or a specific part of such unit component.
The warranty repair does not include:
• routine technical maintenance
• unit installation/dismantling
• unit setup
To benefit from warranty repair, the user must provide the unit, the user's manual with the purchase date stamp, and the payment
paperwork certifying the purchase. The unit model must comply with the one stated in the user’s manual. Contact the Seller for warranty
service.
The manufacturer’s warranty does not apply to the following cases:
• User’s failure to submit the unit with the entire delivery package as stated in the user’s manual including submission with missing
component parts previously dismounted by the user.
• Mismatch of the unit model and the brand name with the information stated on the unit packaging and in the user's manual.
• User’s failure to ensure timely technical maintenance of the unit.
• External damage to the unit casing (excluding external modifications as required for installation) and internal components caused
by the user.
• Redesign or engineering changes to the unit.
• Replacement and use of any assemblies, parts and components not approved by the manufacturer.
• Unit misuse.
• Violation of the unit installation regulations by the user.
• Violation of the unit control regulations by the user.
• Unit connection to power mains with a voltage different from the one stated in the user's manual.
• Unit breakdown due to voltage surges in power mains.
• Discretionary repair of the unit by the user.
• Unit repair by any persons without the manufacturer’s authorization.
• Expiration of the unit warranty period.
• Violation of the unit transportation regulations by the user.
• Violation of the unit storage regulations by the user.
• Wrongful actions against the unit committed by third parties.
• Unit breakdown due to circumstances of insuperable force (fire, flood, earthquake, war, hostilities of any kind, blockades).
• Missing seals if provided by the user’s manual.
• Failure to submit the user’s manual with the unit purchase date stamp.
• Missing payment paperwork certifying the unit purchase.
FOLLOWING THE REGULATIONS STIPULATED HEREIN WILL ENSURE A LONG AND
TROUBLEFREE OPERATION OF THE UNIT
USER’S WARRANTY CLAIMS SHALL BE SUBJECT TO REVIEW ONLY UPON
PRESENTATION OF THE UNIT, THE PAYMENT DOCUMENT AND THE USER’S MANUAL
WITH THE PURCHASE DATE STAMP

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