FläktGroup LQLK Fan Installation and Maintenance Manual
- Type
- Installation and Maintenance Manual
FläktGroup DC_9201GB 20180403_R0 Specifications are subject to alteration without notice
LQLK PLENUM FAN, DIRECT-DRIVEN
INSTALLATION AND MAINTENANCE INSTRUCTION
Picture shows the fan with integral motor.
Other motor options are present.
CONTENT PAGE
Installation options 2
Checks to be made prior to commissioning 2
Electrical connections 2
Measures before starting 3
Installation of separately supplied frequency inverters 3
Airflow measurement 4
Maintenance 5
Cleaning 5
To change the motor 6
2
Installation and maintenance instruction
FläktGroup DC_9201GB 20180403_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 orwith an
integral motor. The frequency inverter permits control of the
motor speed and slow starts.
LQLK FAN, INSTALLATION OPTIONS
CHECKS TO BE MADE PRIOR TO COMMISSIONING
• Check that the fan complies with the EU machinery directive.
All inspection doors on the fan section and other function is
equipped with door locks with a key. Additional safety can be
added. LQLZ-37 is a protective screen which can be placed at
the inlet to the fansection. LQLZ-36 is a protective screen that
can be added to the outlet of the fan section if another AHU func-
tion is placed downstream of the fan. LQLZ-64 is protective
screen when the fan section is placed at the outlet of the AHU.
LQLZ-24 is additional protection behind the inspection door at
the fansection.
• 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 mountings,
the transport locking devices must be removed before starting
the fan.
LQAZ-64
Protective screen
LQAZ-63
Counterflange
LQAZ-61
Flexible connection
LQAZ-62
Connection piece
Connection
Accessories for the
outlet:
LQLZ-36 Safety
guard, outlet
LQLZ-37
Safety guard, inlet
LQLZ-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 occasionally rotated by hand at regular
intervals. If this is not done, the bearings are
liable to become damaged due to overloading
as shown in the adjacent illustration.
N.B.!
The fan must not be started directlyon-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
3
Installation and maintenance instruction
FläktGroup DC_9201GB 20180403_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 LQLK plenum fan can be supplied with an external, factory-fit-
ted 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 LQLK 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 deliv-
ery side closed. However the fan motor may be briefly
energized with the inspection door open for checking that the direc-
tion 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 mountings,
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.
There may be designs of duct systems that
causes wind milling which prevents the impel-
ler from being stopped. The wind milling must
then be prevented;
1) turn off the power to the fan
2) close the dampers.
INSTALLATION OF SEPARATELY SUPPLIED
FREQUENCY INVERTER
The frequency inverter and motor shall be installed by a qual-
ified 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
com-plement to the manufacturer’s installation instructions. If
the content of the instructions differ, the instructions furnished
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
Fläkt Group if the motor has been connected/
wired to a frequency inverter by another fitter,
i.e. one who is not employed by or commis-sio-
ned by FläktGroup.
Note!
The frequency converter have been optimized
for the duty point. The power could thus be
lower than the motors rated power.
4
Installation and maintenance instruction
FläktGroup DC_9201GB 20180403_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.
AIRFLOW MEASUREMENT
The LQLK has equipment for measuring the airflow.
The airflow, q, can be measured by applying a manometer
reading of Δp (Pa), and a constant, k, using the following
formula:
The manometer reading, Δp, which is the difference between
the pressure in the suction chamber by the fan inlet and the
pressure inside the inlet cone, can be read with a manometer
(pressure range of up to 6000 Pa) which should be connected
with a 4 mm dia. tube to 2 externally located pressure tappings.
The value of the constant k is specified in the table below.
A flow indicator with built-in pressure transducer (available as
an accessory) should be connected by means of tubes to the
external pressure tappings. This instrument converts the mano-
meter pressure reading to a flow (m3/s) which is shown on a
display screen and transmits a 0–10 V output signal, linear with
the flow.
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
q = 1 · Δp m3/s
k
Important!
For LQLZ-42 U-tube manometers, use only
the red manometer fluid supplied with the
instrument. Never use any other type of fluid.
Precision-adjust the zero point with the zero
adjustment screw.
5
Installation and maintenance instruction
FläktGroup DC_9201GB 20180403_R0 Specifications are subject to alteration without notice
If the air handling unit is supplied with a control system, the flow
can be read directly in the control panel display.
TEMPERATURE CORRECTION
The flow scale on the indicating instrument and the flow formula
above apply to air with a temperature of +20 °C. For other tempera-
tures, the flow must be corrected using the following formula:
where q = the actual flow through the fan, q20 = the flow reading
and t = the current temperature in °C.
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.
NB!
In the case of air handling units supplied with
a control system, the pressure tappings in
the end connection panels of the unit are not
connected to the airflow sensor of the fan.
If you still want to read the manometer pres-
sure with an external manometer, you can
connect the tubes from the airflow sensor of
the fan across T-nipples to the pressure
tap-pings in the end connection panel of the air
handling unit.
If this external means of measuring flow will
not be permanent, the tubes must be restored
to their original condition.
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.
Size LQLK, aa-b k- factor
60-1, 62-1 6.02
60-2, 62-2 4.6
60-3, 64-1 3.8
62-3, 64-2, 71-2, 73-3, 80-2, 82-1 3.75
64-3, 73-3, 82-2, 84-1 3.01
64-4, 73-4, 82-3, 84-2 2.3
71-1, 73-1, 80-1 3.8
84-3 1.9
If two fans are installed in the fan section, the k-value is appli-ca-
ble to the total airflow generated by both fans.
q = q20 , m3/s
(273 + t)
293
6
Installation and maintenance instruction
FläktGroup DC_9201GB 20180403_R0 Specifications are subject to alteration without notice
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
bottom panel/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 appro-
priate way through the inspection door.
Important!
Make sure that the fan inlet engages into
the rear holder of the connection frame.
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.
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FläktGroup LQLK Fan Installation and Maintenance Manual
- Type
- Installation and Maintenance Manual
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