System air DVN User manual

Document in original language | · 006
Roof fans
DVN(I), DVS(I), DVC(I), DHS
Installation and Operating Instructions GB

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© Copyright Systemair AB
All rights reserved
E&OE
Systemair AB reserves the rights to alter their products without notice.
This also applies to products already ordered, as long as it does not affect the previously agreed specifications.

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Contents
1 General information.........................................1
1.1 Notice symbols......................................1
1.1.1 Instruction symbols.....................1
2 Important safety information .............................1
2.1 Personnel .............................................1
2.2 Personal protective equipment..................2
2.3 5 rules of electrical safety ........................2
3 Warranty.......................................................2
4 Delivery, transport, storage ...............................2
5 Description ....................................................3
5.1 Intended use .........................................3
5.2 Technical data .......................................3
5.3 Description DVN/DVNI.............................4
5.4 Description DVS/DVSI ..............................5
5.5 Description DVC/DVCI..............................6
5.6 Description DHS .....................................7
6 Name plate and type key ..................................8
7 Accessories....................................................9
8 Installation................................................... 10
8.1 Installation of the ventilation
system ..............................................10
8.1.1 DVC-P measuring tubes ............. 11
8.2 Assembly/Disassembly impeller —
Internal rotor motor .............................. 11
8.3 Assembly tilting device (FTG).................. 13
9 Electrical connection ...................................... 13
9.1 Electrical connection accessories ............. 14
9.2 Protecting the motor............................. 15
9.3 Variable-speed fans.............................. 15
10 Commissioning ............................................. 15
11 Operation .................................................... 15
12 Troubleshooting/maintenance/repair ................ 16
12.1 Troubleshooting................................... 16
12.2 Maintenance....................................... 18
13 Cleaning...................................................... 18
14 Deinstallation/dismantling............................... 19
15 Disposal ...................................................... 19
16 EU Declaration of conformity — Roof
fans ...........................................................19
17 EU Declaration of conformity — Thermo
fans ...........................................................19
18 Commissioning Report.................................... 20

General information | 1
1 General information
1.1 Notice symbols
Note:
Useful information and instructions
1.1.1 Instruction symbols
Instruction Instruction with xed sequence
♦Carry out this action 1. Carry out this action 3. (if applicable, further actions)
♦(if applicable, further actions) 2. Carry out this action
2 Important safety information
Planners, plant builders and operators are responsible for the proper assembly and intended use.
♦Read the operating instructions completely and carefully.
♦Keep the operating instructions and other valid documents, such as the circuit diagram or motor instructions, with
the fan. They must always be available at the place of use.
♦Observe and respect local conditions, regulations and laws.
♦Abide by the system-related conditions and requirements of the system manufacturer or plant constructor.
♦Safety elements may not be dismantled, circumvented or deactivated.
♦Only use the fan in a awless condition.
♦Provide generally prescribed electrical and mechanical protective devices.
♦During installation, electrical connection, commissioning, troubleshooting, and maintenance, secure the location and
premises against unauthorised access.
♦Do not circumvent any safety components or put them out of action.
♦Keep all the warning signs on the fan complete and in a legible condition.
♦The device is not to be used 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.
♦Do not allow children to play with the device.
2.1 Personnel
The fan may only be used by qualified, instructed and trained personnel. The persons must know the relevant safety di-
rectives in order to recognise and to avoid risks. The individual activities and qualifications can be found in Table 1 Qual-
ifications, page 1.
Table 1 Qualifications
Activities Qualifications
Storage, operation, transport, cleaning, disposal Trained personnel (see following note)
Electrical connection, commissioning, electrical
disconnection Electrical expert or matching qualification
Installation, disassembly Fitter or matching qualification
Maintenance Electrical expert or matching
qualification
Fitter or matching
qualification
Repair
Electrical expert or matching
qualification
Fitter or matching
qualification
Smoke extraction fans and EX fans only by agreement with
Systemair.
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2|Warranty
Note:
The operator is responsible for ensuring that personnel are instructed and have understood the contents of
the operating instructions. If something is unclear, please contact Systemair or its representative.
2.2 Personal protective equipment
♦Wear protective equipment during all work in the vicinity of the fan.
• protective working clothes
• protective working shoes
• protective working gloves
• helmet
• goggles
• hearing protection
2.3 5 rules of electrical safety
1. Disconnect (disconnection of
the electrical system from
live components at all
terminals)
2. Prevent reactivation
3. Test absence of voltage
4. Ground and short-circuit
5. Cover or restrict adjacent live parts
3 Warranty
For the assertion of warranty claims, the products must be correctly connected and operated, and used in accordance
with the data sheets. Further prerequisites are a completed maintenance plan with no gaps and a commissioning re-
port. Systemair will require these in the case of a warranty claim. The commissioning report is a component of this
document. The maintenance plan must be created by the operator, see section 12.2 Maintenance, page 18.
4 Delivery, transport, storage
Safety information
Warning: Risk from rotating fan blades
♦Prevent access by unauthorised persons by safety personnel or access protection.
Warning: Suspended loads
♦Do not walk under suspended loads.
♦Make sure that there is nobody under a suspended load.
Delivery
Each fan leaves our plant in an electrically and mechanically proper condition. We recommend transporting the fan to
the installation site in the original packaging.
Checking delivery
♦Check the packaging and the fan for transport damage. Any findings should be noted on the cargo manifest.
♦Check completeness of the delivery.
Unpacking
When opening the transport packaging, there is a risk of damage from sharp edges, nails, staples, splinters etc.
♦Unpack the fan carefully.
♦Check the fan for obvious transport damage.
♦Only remove the packaging shortly before assembly.
Transport
Safety information
Warning: Electrical or mechanical hazards due to fire, moisture, short circuit or malfunction.
♦Never transport the fan by the connecting wire, terminal box, impeller, protection grille, inlet cone or silencer.
♦In open transport, please make sure that no water can penetrate into the motor or other sensitive parts.
♦We recommend transporting the fan to the installation site in the original packaging.
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Description |3
Caution: If transported without care during loading and unloading, the fan may be damaged.
♦Load and unload the fan carefully.
♦Use hoisting equipment that is suitable for the weight to be hoisted.
♦Observe the transportation arrows on the packaging.
♦Use the fan packaging exclusively as transport protection and not as a lifting aid.
Storage
♦Store the fan in the original packaging in a dry, dust-free location protected against weather.
♦Avoid the effects of extreme heat or cold.
Hazard due to loss of function of the motor bearing
♦Avoid storing for too long (recommendation: max. 1 year).
♦Check that the motor bearing functions properly before installation.
5 Description
5.1 Intended use
All roof fans
• The fans are intended for installation in ventilation systems. They can be installed both in duct systems and also
with free suction via an inlet cone and a suction-side contact protection grille. Systemair recommends a Back draft
damper (VKS) to avoid cold air intake at a standstill of the fan, see 7 Accessories, page 9.
• The fans are exclusively intended for extract air applications.
DVN, DVNI
• The fan is suitable for conveying contaminated air
(dust, kitchen exhaust).
DVS, DVSI, DVC, DVCI, DHS
• The fan is suitable for conveying clean air.
Incorrect use
Incorrect use refers mainly to using the fan in another way to that described. The following examples are incorrect
and hazardous:
• Conveying of explosive and combustible media
• Conveying of aggressive media
• Operation in an explosive atmosphere
• Operation without duct system or protection grille
• Operation with the air connections closed
5.2 Technical data
Max. ambient temperature [°C]
see data sheet, available in our online catalogue.Max. temperature of transported air [°C]
Sound pressure [dB]
Voltage, current, frequency, enclosure class, weight see name plate of the fan
The motor data can be found on the name plate of the motor, or in the technical documents of the motor
manufacturer.
The data on the name plate of the fan apply to "standard air" according to ISO 5801.
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4|Description
5.3 Description DVN/DVNI
Table 2 Dimensions DVN
E
D
C
B
A
Ri K
H
H
G
F
M20x1,5
J
I(4x)
[mm] A B C D E F G H I J K
355—400 720 618 600 390 438 595 450 200 12(4x) 6xM8 18.5
450—500 900 730 675 465 438 665 535 237 12(4x) 6xM8 18.5
560—630 1150 955 900 560 605 939 750 293 14(4x) 8xM8 0
710 1350 1178 936 660 674 1035 840 320 14(4x) 8xM8 0
800—900 1690 -1180 830 872 1255 1050 433 14(4x) 8xM8 0
Table 3 Dimensions DVNI
[mm] A B C D E F G H I J K
355—400 874 648 600 439 438 595 450 200 12(4x) 6xM8 18.5
450—500 970 730 675 479 438 665 535 237 12(4x) 6xM8 18.5
560—630 1315 1035 900 600 605 939 750 293 14(4x) 8xM8 0
710 1483 1165 936 729 674 1035 840 320 14(4x) 8xM8 0
800—900 1590 -1180 830 872 1255 1050 433 14(4x) 8M8 0
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Description |5
5.4 Description DVS/DVSI
Table 4 Dimensions DVS
H
M20x1,5
I
K
F
E
C
B
A
[mm] A B C E F H K I
190–225 370 320 175 335 245 6xM6 213 10(4x)
310–311 560 470 330 435 330 6xM8 285 10(4x)
355–400 723 623 390 595 450 6xM8 438 12(4x)
450–500 900 730 465 665 535 6xM8 438 12(4x)
560–630 1150 960 565 939 750 8xM8 605 14(4x)
710 1350 1185 660 1035 840 8xM8 674 14(4x)
Table 5 Dimensions DVSI
[mm] A B C E F H K I
190–225 498 438 210 335 245 6xM6 213 10(4x)
310–311 695 584 370 435 330 6xM8 285 10(4x)
355–400 877 745 440 595 450 6xM8 438 12(4x)
450–500 970 825 479 665 535 6xM8 438 12(4x)
560–630 1315 1130 600 939 750 8xM8 605 14(4x)
710 1483 1185 729 1035 840 8xM8 674 14(4x)
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6|Description
5.5 Description DVC/DVCI
S-Version:
The DVC-S version can be stepless controlled via a 0-10 V signal. The operating point can be directly adjusted with the
integrated potentiometer (10 K ohms).
POC-Version
The DVC-POC version has integrated pressure sensors and temperature sensor for outdoor temperature compensation.
The electronics can be programmed for a constant pressure operation with or without outdoor temperature compensa-
tion (The factory setting is with outdoor temperature compensation). For any details of the controller, please see the
separate attached controller manual.
P-Version:
The DVC-P version has integrated pressure sensors and the electronic is programmed for a constant pressure operation.
For any details of the controller, please see the separate attached controller manual.
This version can also be ordered as CAV (constant air volume).
Table 6 K-factor (measured values) DVC-P
315–P EC 103 450–P EC 245 560–P EC 298
355–P EC 143 450–K-P EC 253 630–P EC 498
400–P EC 207 500–P EC 365 710–P EC 628
Table 7 Dimensions DVC-S
H
M20x1,5
I
K
F
E
C
B
A
[mm] A B C E F H K I
190–225 370 320 175 335 245 6xM6 213 10(4x)
315 560 470 330 435 330 6xM8 285 10(4x)
355–400 723 623 390 595 450 6xM8 438 12(4x)
450–500 900 730 465 665 535 6xM8 438 12(4x)
560–630 1150 960 565 939 750 8xM8 605 14(4x)
Table 8 Dimensions DVCI-S
[mm] A B C E F H K I
190–225 498 438 210 335 245 6xM6 213 10(4x)
315 695 584 370 435 330 6xM8 285 10(4x)
355–400 874 648 439 595 450 6xM8 438 12(4x)
450–500 970 730 479 665 535 6xM8 438 12(4x)
560–630 1315 1130 600 939 750 8xM8 605 14(4x)
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Description |7
Table 9 Dimensions DVC-P/DVC-POC
H
M20x1,5
I
K
F
E
C
D
B
A
[mm] A B C D E F H K I
190–225 370 320 175 -335 245 6xM6 213 10 (4x)
315 560 470 330 378 435 330 6xM8 285 10 (4x)
355–400 723 623 390 438 595 450 6xM8 438 12 (4x)
450–500 900 730 465 515 665 535 6xM8 438 12 (4x)
560–630 1150 960 565 585 939 750 8xM8 605 14(4x)
Table 10 Dimensions DVCI-P/DVCI-POC
[mm] A B C D E F H K I
225 498 438 210 -335 245 6xM6 213 10(4x)
315 690 583 369 415 435 330 6xM6 285 10(4x)
355–400 877 745 440 439 595 450 6xM8 438 12(4x)
450–500 970 825 479 516 665 535 6xM8 438 12(4x)
560–630 1315 1135 600 619 939 750 8xM8 605 14(4x)
5.6 Description DHS
The fans are equipped with AC motors. For information on speed regulation options, see 6 Name plate and type key,
page 8.
Table 11 Dimensions DHS
size 190 to 500 –> round cap
Ø A
Ø E
C
H
F
M20x1,5
Ø I(4x)
Ø K
size 560 to 710 –> squared cap
A
C
E
F
M20x1,5
Ø I(4x)
H
Ø K
[mm] A C E F H K I
190–225 417 150 335 245 6xM6 213 10(4x)
310–315 540 250 435 330 6xM8 285 10(4x)
355–400 720 330 595 450 6xM8 438 12(4x)
450–500 830 490 665 535 6xM8 438 12(4x)
560–630 1100 535 939 750 8xM8 605 14(4x)
710 1282 580 1035 840 8xM8 674 14(4x)
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8| Name plate and type key
6 Name plate and type key
1
2
3
4
5
6
8
7
400 V
1Type designation 5Enclosure class/fan impeller speed/weight
2Voltage/current/frequency 6Insulation class
3 Input power 7 Article number/production number/manufacturing date
4Max. temperature of transported air 8Certifications
Table 12 Type key
DVN 500 -D4
Motor type
EC Electronically commutated/1 phased or 3 phased
E2 2 poled/controllable by frequency converter/1 phased
E4 4 poled/controllable by frequency converter/1 phased
E6 6 poled/controllable by frequency converter/1 phased
DV 4 poled voltage controllable/3 phased
DS 6 poled voltage controllable/3 phased
EZ 2 poled voltage controllable/1 phased
EV 4 poled voltage controllable/1 phased
ES 6 poled voltage controllable/1 phased
D4 4 poled/controllable by frequency converter/3 phased
D6 6 poled/controllable by frequency converter/3 phased
Only at DVC
SControllable via a 0-10 V signal
PIntegrated pressure sensors
POC Integrated pressure sensors and temperature sensor
Size
Fan type
DVN Roof fan - vertical discharge - high temperature
DVNI Roof fan - vertical discharge - high temperature - insulated
DVS Roof fan - vertical discharge - standard
DVSI Roof fan - vertical discharge - standard - insulated
DVC Roof fan - vertical discharge - ec motor
DVCI Roof fan - vertical discharge - ec motor - insulated
DHS Roof fan - horizontal discharge - standard
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Accessories |9
7 Accessories
For details of the accessories, please check our online catalog or contact Systemair.
2
3
4
5
2
6
7
9
10
8
1a 1b 1c 1d 1d
Table 13 Accessories
1a DVN, DVNI Roof fan - vertical discharge - high temperature - (insulated)
1b DVS/DVSI Roof fan - vertical discharge - standard - (insulated)
1c DVC/DVCI Roof fan - vertical discharge - ec motor - (insulated)
1d DHS
Roof fan - horizontal discharge - standard
size 190 to 500 –> round cap
size 560 to 710 –> squared cap
2VKS (ii) Back draft damper 7FTG (iii) Tilting device
3SSD (i) Socket silencer 8 TDA Adapter framework
4 ASK Inflow box SSD 9VKM (ii) Back draft damper (motor
driven)
5 ASS Flexible connection 10 FDS (i) Flat roof socket
6 ASF Inlet flange
Note:
i. Size 190–450: If the degree of inclination is higher than 15°, a SSS (Slanting socket silencer) or a SDS
(Slanting roof socket) has to be used.
Size 499–630: If the degree of inclination is higher than 10°, a SSS (Slanting socket silencer) or a SDS
(Slanting roof socket) has to be used.
ii. Do not install a VKS (self-actuating back draft damper) for roof fans (e.g. P version, POC version) which
are controlled by sensors in the duct system. In this case, you must use a VKM (motor-driven back draft
damper).
iii.See chapter 8.3 Assembly tilting device (FTG), page 13
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10 | Installation
8 Installation
Safety information
♦Observe 2 Important safety information, page 1
♦Use installation material with fire resistance classes that meet temperature requirements.
♦Provide contact and intake protection and ensure safety distances according to DIN EN ISO13857 and DIN 24167-1.
♦To reduce transmission of vibration to the duct system, we recommend flexible connections from our accessory
range, see chapter Accessories.
Preconditions
♦Ensure that the fan and all its components are
undamaged.
♦Fit the fans in such a way that there is sufficient
access for installation, troubleshooting, maintenance
and repair.
♦Protect against dust and moisture when installing.
♦Ensure that the information on the name plates (fan
and motor) matches up with the operating conditions.
8.1 Installation of the ventilation system
Leaking roof due to wrong installation.
♦The roof seal (e.g. plastic or bitumen foil) has to be pulled and
fixed under the base plate of the roof fan, see below picture.
Leaking duct system.
♦When installing the roof fan and accessories all mounting
surfaces have to be sealed air tight.
Condensate formation due to thermal bridge.
1. Check if the fan and accessories form a thermal bridge.
2. Insulate the fan and accessories with vinyl rubber (e.g. Armaflex)
in sufficient thickness.
The below installation diagram is an example.
1
3
4
5
6
7
8
9
2
1 Base plate of the roof fan 6VKS/VKM Back draft damper
2SSS Slanting socket silencer 7Has to be realized on-site
3Roof seal e.g. plastic or bitumen foil 8 ASS Flexible connection
4Isolation 9Duct system
5Roof construction
Damage to the bearings or other parts of the fan can occur.
♦Do not place a duct bend directly before or after the fan!
♦Ensure a smooth and constant air flow to the device.
• Rectangular duct system: D= Hydraulic diameter
• Round duct system: D= Nominal diameter
min.
2,5x Ø D
Ø D
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Installation | 11
8.1.1 DVC-P measuring tubes
The following illustrations show the schematic installation of the measuring tubes.
Size
190–225
Size
315–710
A
B
AMeasuring tubes
A
B
B Duct system
Controller input
-Duct system
+Atmosphere
8.2 Assembly/Disassembly impeller — Internal rotor motor
If an external rotor motor is used, the motor and impeller can`t be seperated.
Damage to the motor and impeller.
The ball bearing of the motor and the balanced impeller may be damaged by forceful impacts.
♦Attach the impeller and/or the shaft extension to the shaft or the rotor without forceful impacts.
♦Do not separate the impeller and the hub. They were balanced as one unit by Systemair.
Note:
The hub can be heated for easier assembly and disassembly, for example with a hot-air blower.
• Precondition for assembly: the wedge is in the intended groove.
• Tools: hexagon socket wrench and suitable tool for removal, torque wrench for the taper clamping bush.
1 Motor
1
2
3
4
5
6
6
87
2Motor shaft
3Sleeve (not available at every fan)
4Shaft extension (not available at every fan)
5Hexagon socket screw
6Impeller
7Steel hub
8Aluminium hub
The hub is shown without impeller due to better lucidity.
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12 | Installation
Disassembly
1. Aluminium hub 1. Steel hub 2. 3. 4.
1.
2.
1.
2.
Assembly
1. 2. 3. 4. 5. Aluminium hub
=
Use screw locking
The set screw must
push on the wedge
of the shaft.
2.
1.
Use screw locking
5. Steel hub 6. Steel hub
Tighten the screws
slightly
Tighten the two
screws evenly with
the tightening torque
according to table
14.
Table 14 Tightening torques for various types of bush
Type of bush 1008 1108 1210 1215 1310 1610 1615 2012 2517 3020
Tightening
torque [Nm]
5.7 5.7 20 20 20 20 20 31 49 92
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Electrical connection | 13
8.3 Assembly tilting device (FTG)
Danger of injury by tilting the fan during installation.
♦The tilting device must be secured in the opened state
by screws in the designated hole against
unintentional folding.
Leaking duct system.
♦When installing the roof fan and accessories, all
mounting surfaces have to be sealed air tight.
1.
A
B
2. 3.
E
F
1:5
E
1:5
F
6.5 mm
A
B
9 Electrical connection
Safety information
♦Observe 2 Important safety information, page 1
♦Prevent the ingress of water into the connection box.
Connection
♦Check if the data on the nameplate matches the
connection data.
♦Complete the electrical connection according to the
circuit diagram.
♦Fans with EC- motors must be switched on/off via the
control input.
♦Connect the cable end in a dry environment.
♦Install a circuit breaker in the permanent electrical
installation, with a contact opening of at least 3 mm
at each pole.
Protective grounding wire
The protective grounding must have a cross-section equal to or greater than that of the phase conductor.
Residual current circuit breaker
All-current-sensitive residual current circuit breakers are required for use in alternating-current systems with 50/60
Hz, in combination with electronic devices such as EC motors, frequency converters or uninterruptible power supplies
(UPS).
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14 | Electrical connection
9.1 Electrical connection accessories
The following wiring diagrams show the electrical connections between accessories and
fans (with EC motor) or frequency converters (e.g. FRQ, FRQS, FXDM) which can be
controlled with a 0–10V signal. If you are not sure if your fan is equipped with an EC- motor
please see chapter 6 Name plate and type key, page 8.
motor/frequency
converter
All fans with EC motors are equipped with a pre-wired potentiometer (0–10V).
10V
GND
0-10V
♦The potentiometer must be disconnected if the fan should be controlled by other
accessories via 0–10V (e.g. accessories below).
10V
GND
0-10V
Wire- colours of motors with carried out cables: +10V = red 0..10V/PWM =
yellow
GND = blue
Controll via 0–10V signal
MTP 10 MTP 20 S-5EC/FRQ
S-5EC/FRQ
10V
GND
A
EC-Basic MTV—1/10 EC-Vent
EC-Vent
IN/10V
OUT/PWM
GND
IN/RPM TACH
+10V
0...10V/PWM
GND
optional
PWM
Controll via switching on / off
The following fans are equipped with a DIN1 connection:
DVC(I) 560... DVC(I) 710... DVN(I) 500EC...
DVC(I) 630... DVN(I) 450EC-K... DVN(I) 560EC...
Din1: enable electronics
• enable: pin open or voltage 5–50 V DC
• disable: bridge to GND
CO2RT-R(-D) IR24–P
24V AC
CO2RT-R-D
Supply
Neutral
Common
Relay NO
Relay NC
+10V
0...10V
GND
Din1
24V AC or DC
IR24-P
24V
Neutral
Common
Relay NO
Relay NC
+10V
0...10V
GND
Din1
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Commissioning |15
9.2 Protecting the motor
Note:
In fans equipped with an EC motor, there is no additional motor protection needed. The motor protection is
integrated in the electronics of the motor.
Damage to motor due to overcurrent, overload or short circiut.
♦Lead-out temperature monitors must be integrated in the control circuit in such a way that, if a fault occurs, the mo-
tor cannot switch on again automatically after it has cooled down.
♦Motor lines and temperature monitor lines should be laid separately on principle.
♦Without thermal protection: Use a motor protection switch!
9.3 Variable-speed fans
Resonant frequencies may result increased vibration in certain speed ranges. These vibrations may destroy
components.
♦Only operate the fan outside these speed ranges.
♦Pass through these speed ranges so quickly that any vibration cannot exceed the admissible resonant frequency
values.
♦Observe the operating instructions of the frequency converter.
Damage as a result of incorrect commissioning of the frequency converter.
♦Install the fan and frequency converter as near as possible to one another.
♦Use shielded cables.
♦All components (fan, frequency converter and motor) must be grounded.
♦Avoid running the fan via the frequency converter below 10 Hz.
♦Heating of the motor due to use of a variable frequency drive must be checked in the application by the customer.
♦Never exceed the maximum impeller rotation speed indicated on the name plate of the fan.
♦In any case Systemair recommends an all-pole sine filter if the fan is operated with a frequency converter.
♦For the following fans an all-pole sine filter is mandatory to avoid damages:
DVS, DVSI, DHS
10 Commissioning
Warranty claims can only be made if commissioning work is carried out correctly and written evidence thereof is
provided.
Safety information
♦Observe 2 Important safety information, page 1
Preconditions
♦Installation and electrical connection have been
correctly performed.
♦Before switching the fan on, check for externally
visible damage and ensure that the protective
equipment functions properly.
♦Inlet and outlet are free.
♦Cable glands are tight.
♦Safety devices have been fitted.
Tests
Do the tests requested in the commissioning report (18 Commissioning Report, page 20)
11 Operation
Safety information
♦Observe 2 Important safety information, page 1
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16 | Troubleshooting/maintenance/repair
12 Troubleshooting/maintenance/repair
Safety information
♦Observe 2 Important safety information, page 1
12.1 Troubleshooting
Table 15 Troubleshooting
Problem Possible causes Remedy
Fan does not reach
nominal speed
Defective motor winding Contact Systemair
Control units (if used) such as
frequency converter or
transformer are set incorrectly.
Correct the settings of the control units.
Mechanical blockage Remove the blockage.
Fan does not run
smoothly
Impeller imbalance Rebalancing by a specialist company if possible,
otherwise contact Systemair.
Soiling on the impeller Clean carefully, rebalance
Material decomposition on the
impeller due to aggressive
material conveyed.
Contact Systemair
Impeller rotates in wrong
direction.
Change direction of rotation if possible, otherwise contact
Systemair.
Deformation of impeller due to
excessive temperature.
Ensure that the temperature does not exceed the certified
value/Install new impeller.
Vibrations, oscillations Check the installation of the fan/check the duct system,
see 8 Installation, page 10.
Fan operation in resonant
frequency range Consider chapter 9.3 Variable-speed fans, page 15
Air output of fan too
low
Impeller rotates in wrong
direction.
Change direction of rotation if possible, otherwise contact
Systemair.
Wrong wiring configuration (e.g.
Y instead of Delta). Check and possibly correct the wiring configuration.
Pressure losses too high. Optimize the line routing.
Flow regulators not or only
partly open. Check opening position on site.
Intake or pressure ducts are
blocked. Remove the blockage.
If the heat build-up in EC motors
is too high, the power is
throttled to protect the
electronics or to prevent a
shutdown. As soon as the
temperature comes back to a
normal value, the motor returns
to adjusted speed.
(Valid for fans driven by EC
Motors with “derating function”
only)
Check ambient temperature.
Improve cooling.
Grinding sounds
when starting or
operating the fan
Check if the duct connections of
the fan are strained. Loosen the duct connections and realign it.
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