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FläktGroup DC_10395GB 20210503_R1 Specifications are subject to alteration without notice
EQLA PLENUM FAN,
DIRECT-DRIVEN
INSTALLATION AND MAINTENANCE INSTRUCTION
Contents ....................................................... Page
Installation options ..............................................................................2
Checks to be made prior to commissioning ..............................2
Electrical connections .......................................................................2
Measures before starting .................................................................3
Airflow measurement ........................................................................3
Temperature correction ....................................................................4
Maintenance ..........................................................................................4
Cleaning ..................................................................................................4
To remove the fan from the air handling unit casing,
Asynchronous and PM-motors ......................................................4
To replace the motor...........................................................................5
Installation and maintenance instructions
2
FläktGroup DC_10395GB 20210503_R1 Specifications are subject to alteration without notice
ELECTRICAL CONNECTIONS
The motor of the fan must always be controlled by a frequency inver-
ter. The frequency inverter permits control of the motor speed and
slow starts.
EQLA FAN, INSTALLATION OPTIONS
EQLZ-36
Protective screen
EQAZ-25
Flexible connection
EQAZ-26
Connection piece
Connection
Accessories for the
outlet:
EQLZ-36 Safety
guard, outlet
EQLZ-39
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 occasionally
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
Deformation on
bearing due to
overloading.
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. EQLZ-39 is a protective screen which can be placed at
the inlet to the fan section. EQLZ-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. EQLZ-36 is protective
screen when the fan section is placed at the outlet of the AHU.
EQLZ-24 is additional protection behind the inspection door at
the fan section.
• 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.
Installation and maintenance instructions
3
FläktGroup DC_10395GB 20210503_R1 Specifications are subject to alteration without notice
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MEASURES BEFORE STARTING
The fan must not be started with the damper on the suction or deli-
very 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.
Max frequency or max rotational speed
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.
AIRFLOW MEASUREMENT
The EQLK 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 STAZ-23, STBZ-
23 (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.
If the air handling unit is supplied with a control system, the flow
can be read directly in the control panel display.
q = 1 · Δp m3/s
k
Important!
For EQLZ-42 U-tube manometers, use only the blue
manometer fluid supplied with the instrument. Never
use any other type of fluid. Precision-adjust the zero
point with the zero adjustment screw.
Installation and maintenance instructions
4
FläktGroup DC_10395GB 20210503_R1 Specifications are subject to alteration without notice
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 clea-
ned more 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, ASYNCHRONOUS AND PM-MOTORS
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.
3. If a pressure suppressor and steel spring anti-vibration
mountings are fitted: Remove the nuts 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.
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 tappings
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.
If two fans are installed in the fan section, the k-value is applicable to
the total airflow generated by both fans
q = q20 , m3/s
(273 + t)
293
Size EQLA-aaa-b
k-factor
Fan size
L=1 L=2
008-2, 009-2 48,0 42,4 028
008-3, 009-3 48,0 34,0 031
011-2, 014-2 37,89 25,7 035
011-3, 014-3, 018-2, 020-2 23,38 20,0 040
018-3, 020-3, 023-2 18,27 16,4 045
023-3, 027-2 14,29 12,9 050
027-3, 032-2, 036-2, 041-2 11,69 10,1 056
032-3, 036-3, 041-3, 045-2, 047-2, 050-2 9,45 8,57 063
045-3, 047-3, 050-3, 054-2, 056-2, 063-2,
072-2
6,79 6,79 071
054-3, 056-3, 063-3, 068-2, 072-3, 079-2 5,37 5,37 080
068-3, 079-3, 090-2 4,24 4,24 090
090-3 3,43 3,43 100
Installation and maintenance instructions
5
FläktGroup DC_10395GB 20210503_R1 Specifications are subject to alteration without notice
5. Withdraw the fan unit. Be careful not to damage the gasket
in the fan’s inlet plate (applies to rubber antivibration
mountings).
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 the main switch and mark that
work is ongoing in the fan section.
2.
Disconnect all electrical connections in the motor terminal box.
3. Remove the motor bracket from their bolted joints at the unit’s
bottom panel/guide rails.
4. Move the motor bracket with motor and impeller from the inlet
cone far enough to enable removal of the impeller.
5. Alternatively loose the bolt joint on the motor and rotate the
motor to enable removal of the impeller.
6. Remove the impeller from the motor shaft using a puller.
7. Lift the impeller out of the unit in a suitable way through the
inspection door or disconnect the motor bolted joints if this
has not been done and lift themotor out of the unit in an appro-
priate way through the inspection door.
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Locking
bolt
Important!
Make sure that the fan inlet engages into the rear
holder of the connection frame.
TO REPLACE 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 instructions
provided by the motor supplier.
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