FläktGroup PLENUM FAN is a direct drive variable speed fan designed for a wide range of applications, including ventilation, air conditioning, and smoke extraction. The fan is constructed of galvanized steel and is available in a variety of sizes and configurations to meet the specific needs of your application. The fan's variable speed motor allows for precise control of airflow and static pressure, making it ideal for use in applications where precise airflow control is critical.
FläktGroup PLENUM FAN is a direct drive variable speed fan designed for a wide range of applications, including ventilation, air conditioning, and smoke extraction. The fan is constructed of galvanized steel and is available in a variety of sizes and configurations to meet the specific needs of your application. The fan's variable speed motor allows for precise control of airflow and static pressure, making it ideal for use in applications where precise airflow control is critical.
Contents Page
Installation options.......................…………………………………..... 2
Checks to be made priortocommissioning........................ 2
Electrical connections.....................……………………………….... 2
Instructions for starting the fan..........…………………………..... 3
Installation of separately supplied
frequency inverters.……………………………………………………….. 3
Maintenance……………………………………..................................... 4
Cleaning .......................................……………………………………..... 4
To remove the fan from the unit casing..……………………..… 4
To replace the motor.........................………………………………... 5
Picture shows the fan with integral motor.
Other motor options are present.
PLENUM FAN
AQLK PLENUM FAN, DIRECT-DRIVEN
INSTALLATION AND MAINTENANCE INSTRUCTIONS
FläktGroup DC_9114GB 20181024_R0 Specifications are subject to alteration without notice
PLENUM FAN
Installation and maintenance instructions
2
FläktGroup DC_9114GB 20181024_R0 Specifications are subject to alteration without notice
ELECTRICAL CONNECTIONS
The motor of the fan must always be controlled by a frequency
inverter, i.e. either via a separate frequency inverter or with an
integral motor. The frequency inverter permits control of the motor
speed and slow starts.
AQLK FAN, INSTALLATION OPTIONS
CHECKS TO BE MADE PRIOR TO COMMISSIONING
• Check that the fan complies with the EU Machinery Directive
regarding safety guards. The fan section must be equipped
with an EQLZ-36 if it can be accessed from a duct or other
functional section. As an alternative, functional sections that
have an inspection door and are located upstream or down-
stream of the fan can be fitted with an EQAZ-14 door lock.
An EQLZ-24 “protective screen for door” or EQAZ-14 door lock
can be used as a safety guard.
• Check that a qualified electrician has handed over written
approval for commissioning.
• Check that the fan impeller rotates freely and that no objects
which can be drawn in and damage the fan have been left in
the installation.
• If the fan is equipped with steel spring anti-vibration moun-
tings, the transport locking devices must be removed before
starting the fan.
EQAZ-28 Protective
screen
EQAZ-27
Counterflange
EQAZ-25
Flexible connection
EQAZ-26
Connection piece
Connection
Accessories for the
outlet:
EQAZ-36 Safety
guard, outlet
EQAZ-37
Safety guard, inlet
EQLZ-24 Protective
screen for door
Important!
If the fans are idle for more than 3 months prior
to or after installation, the fans should be occa-
sionally rotated by hand at regular intervals.
If this is not done, the bearings are liable to be-
come damaged due to overloading as shown in
the adjacent illustration.
N.B.!
The fan must not be started directly on-line!
Read the MAX permissible frequency at which
the fan motor may be controlled. You’ll find this
frequency specified on the rating plate. Under
no circumstances is it permissible to supply
the fan motor with power of a higher frequency.
Belastningsskador
Deformations due
to overloading
PLENUM FAN
Installation and maintenance instructions
3
FläktGroup DC_9114GB 20181024_R0 Specifications are subject to alteration without notice
The cable between the terminal box of the motor and the separate
frequency inverter must be shielded. A safety isolating switch
must be installed between the mains supply and the frequency
inverter. Install the safety isolating switch near the inspection
door of the fan.
Before beginning work on the fan, isolate the power supply by
switching off the safety isolating switch.
The AQLK plenum fan can be supplied with an external, factory-
fitted frequency inverter, wired to the terminal box of the motor
with a shielded cable. A prefitted safety isolating switch prewired
to the frequency inverter is also available as an accessory.
The AQLK plenum fan can also be supplied with a factory-fitted
shielded cable run to an external shielded terminal box.
MEASURES BEFORE STARTING
The fan must not be started with the damper on the suction or
delivery side closed. However the fan motor may be briefly
energized with the inspection door open for checking that the
direction of impeller rotation is correct.
Check before starting the fan that the impeller rotates freely
and that no objects, which can be drawn in and damage the fan,
have been left in the installation.
If the fan is equipped with steel spring anti-vibration moun-
tings, the transport locking devices must be removed before
starting the fan.
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MAX frequency
Electric wiring must be carried out by a
qualified electrician.
Important!
Isolate the power supply and wait until the im-
peller has stopped rotating (approx. 1 minute)
before inspecting and servicing the fan.
INSTALLATION OF SEPARATELY SUPPLIED
FREQUENCY INVERTER
The frequency inverter and motor shall be installed by a quali-
fied electrician with adequate knowledge on how to install
speed-controlled drive systems (frequency inverters) and
EMC safety.
The following recommendations shall be regarded as a
complement to the manufacturer’s installation instructions.
If the content of the instructions differ, the instructions furni-
shed by the manufacturer shall have priority over those stated
below, to enable compliance with the guarantee liability terms
of the manufacturer of the equipment.
GENERAL
A continuous, shielded 4-wire cable designed for EMC installa-
tion to motorized drives should be installed between the motor
and the frequency inverter. The optical density of the cable shield
shall be at least 80 %, e.g. NCY or Olflex Classic. The shield must
be in 360 º contact with the casing both in the motor and in the
frequency inverter in order to achieve maximal surface contact.
It is not advisable to install a safety isolating switch or junction
boxes between the frequency inverter and the motor.
FREQUENCY INVERTER
The shielded cable must be led either through an EMC approved
cable gland in the casing of the frequency inverter or through a
cap intended for this purpose.
The shielded cable must not be connected to an earth screw.
Warning!
FIf the frequency inverter is not installed
correctly, this may damage the motor bearings.
FläktGroup’s policy stipulates that we agree
to accept guarantee liability only if the motor
and frequency inverter have been supplied
and installed by us.
Guarantee liability will not be accepted by
FläktGroup if the motor has been connected/
wired to a frequency inverter by another fitter,
i.e. one who is not employed by or commis-
sioned by FläktGroup.
Warning!
The frequency converter have been optimized
for the duty point. The power could thus be
lower than the motors rated power.
PLENUM FAN
Installation and maintenance instructions
4
FläktGroup DC_9114GB 20181024_R0 Specifications are subject to alteration without notice
CAPACITIES IN EXCESS OF 22 KW
If the capacity exceeds 22 kW, a symmetrically shielded cable
with concentric or in some other way symmetrically designed
protective earth conductor should be used. For recommenda-
tions governing these installations we refer to the installation
instructions for the frequency inverter.
MAINTENANCE
The fan must be inspected and cleaned every 6 /12th month.
The length of the interval has been determined on the basis of
approx. 2000 hours of operation during a 12-month period and
for a normal comfort installation.
In environments where the dust content is high in the supply
and/or extract air, the air handling unit will have to be inspected
and cleanedmore often.
The fan is accessible through the inspection door and cleaned
with the fan in place.
CLEANING
Both the supply air and the extract air fan should be inspected
and cleaned whenever the need arises. Dust tends to collect
mainly on the inner side of the fan blades.
The best way to clean the fan impeller is by using a vacuum
cleaner equipped with a soft nozzle. Be careful to remove all
the impurities from the fan blades so that the fan will not come
out of balance.
After adjusting or cleaning the fan, check that it runs free of
vibration.
TO REMOVE THE FAN FROM THE AIR HANDLING
UNIT CASING, SIZES 005-090
The fan can be withdrawn from the casing in the following way:
1. Remove the frame of the inspection door including the door
and the fixed panel by removing the bolts beneath the cover
plenums.
2. Disconnect the motor cable/control cable to the frequency
inverter and pull the cables through the rotor wall/filter wall.
Warning!
In order to prevent personal injury and damage
to machinery, the safety isolating switch must
be switched off and the safety fuses of the fan
must be removed before beginning work on
the fan.
The shield must be in
360º contact with
the casing
Shield
Insulating tape
TO CONNECT THE SHIELDED CABLE
If the application requires you to wire the cable shield to an
earthscrew inside the motor or the frequency inverter, this
must be done in such a way that the impedance will be as
low as possible. In these cases the length of this conductor
must be restricted to 5 times the width of the conductor.
For instance, the length of a 1 cm wide conductor should
not exceed 5 cm.
MOTOR
The cable must be led into the terminal box of the motor
through an EMC approved cable gland, e.g. through a Miltronic
SKINTOPMS-SC. The shielded cable must only be connected
via the EMC cable gland, not to an earth screw.
OTHER DETAILS
In addition to the above, observe the following:
• type of mains power supply
• local electrical safety rules and regulations
• manufacturer’s installation instructions for the frequency
inverter.
Insulating tape
The shield must be
in 360º contact with
the casing Casing
Shield
PLENUM FAN
Installation and maintenance instructions
5
FläktGroup DC_9114GB 20181024_R0 Specifications are subject to alteration without notice
TO CHANGE THE MOTOR
1. Disconnect the electrical connections.
2. Remove the stop screw in the fan impeller hub.
3. Remove the motor from the motor base plate.
4. Extract the impeller from the motor shaft end with an
extractor tool. Utilize the existing extraction grooves in
the hub for this purpose. See the figure below.
5. Back the motor from the impeller.
6. Reassemble in the reverse order, using the tapped hole in
the motor shaft end as a fixing point for the extractor tool.
Carry out maintenance on the motor according to the instruc-
tions provided by the motor supplier.
Important!
Make sure that the fan inlet engages into
the rear holder of the connection frame.
3. If a shear absorber is fitted: Remove the bolts (2 bolts) that
secure its brackets. Ignore the bolts on the rear side; they
need not be backed off.
If a pressure suppressor and steel spring anti-vibration
mountings are fitted: Remove the bolts to the fan beams in
the floor at both ends.
4. If steel spring anti-vibration mountings are fitted: Remove
the bolts that hold the fan connection against the fan outlet.
5. Withdraw the fan unit. Be careful not to damage the gasket
in the fan’s inlet plate (applies to rubber antivibration mount-
ings).
The fan can be withdrawn maximally so far out that half the
fan motor protrudes outside the unit casing without support.
6. Push in and reassemble the components in the reverse
order.
In cases where there is no possibility to carry out the entire fan
or motor with impeller, alternatively there is no need for a com-
plete disassembly, following procedure can be used:
1. NOTE! Turn off the power at themain switch and mark that
work is ongoing in the fan section.
2. Disconnect all electrical connections in themotor terminal
box.
3. Remove themotor bracket fromtheir bolted joints at the
unit’s bottompanel / guide rails.
4. Move themotor bracketwithmotor and impeller from the
inlet cone far enough to enable removal of the impeller.
5. Alternatively loose the bolt joint on themotor and rotate the
motor to enable removal of the impeller.
6. Remove the impeller fromthemotor shaft using a puller.
7. Lift the impeller out of the unit in a suitableway through the
inspectiondoor or disconnect the motor bolted joints if this
has not been done and lift themotor out of theunit in an
appropriate way through the inspectiondoor.
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Locking
bolt
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FläktGroup PLENUM FAN is a direct drive variable speed fan designed for a wide range of applications, including ventilation, air conditioning, and smoke extraction. The fan is constructed of galvanized steel and is available in a variety of sizes and configurations to meet the specific needs of your application. The fan's variable speed motor allows for precise control of airflow and static pressure, making it ideal for use in applications where precise airflow control is critical.
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