FläktGroup EQLA Plenum fan Installation and Maintenance Manual

Brand: FläktGroup

Model: EQLA Plenum fan

Type: Installation and Maintenance Manual

FläktGroup EQLA Plenum fan is a direct-driven, high-performance fan designed for use in a variety of ventilation and air conditioning applications. It is constructed with a robust steel casing and features a backward-curved impeller for efficient and quiet operation. The fan is equipped with a built-in terminal box for easy electrical connections and can be controlled via a frequency inverter for variable speed operation. The EQLA Plenum fan is ideal for use in both new and existing installations, and is suitable for a wide range of applications, including: • Supply and exhaust ventilation • Air conditioning

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

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

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

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

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

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.

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.

FläktGroup EQLA Plenum fan Installation and Maintenance Manual

FläktGroup EQLA Plenum fan Installation and Maintenance Manual

FläktGroup EQLA Plenum fan Installation and Maintenance Manual

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