FläktGroup LQLR Fan Installation guide

Brand: FläktGroup

Model: LQLR Fan

Type: Installation guide

FläktGroup DC_9142GB 20180319_R0

Specifications are subject to alteration without notice

INSTALLATION INSTRUCTION

LQLR FAN

EUL(B,F) 1

LQLZ-04 Protective screen

LQLZ-03 counterflange

LQLZ-01 flexible connection

LQLZ-02 connection piece

LQLZ-09 damper

LQLZ-06 connection piece

LQLZ-05 flexible connection

LQLZ-07 counterflange

LQLZ-08 protective screen

OUTLET:

INLET:

INSTALLATION

Fig. 1

HORIZONTAL INSTALLATION INSTALLATION ALTERNATIVES

The fan can be installed to discharge into a duct or into some other

unit section. Alternative directions of dis charge and locations of dis-

charge opening are shown in Fig. 2.

1) Upward outlet not possible

2) Downward outlet not possible

Fig. 2

EUL(B,F) 2

Outlet upwards

Top inlet1)

Outlet forward

Outlet downwards

Bottom inlet2)

Normal inlet

(end wall)

Rear inlet

LQLR Fan - Installation instruction

FläktGroup DC_9142GB 20180319_R0

Specifications are subject to alteration without notice

The duct can be connected to the casing in accordance with one of

the following alternatives:

A. By means of a connection piece secured to the unit casing with

self-tapping screws. The duct can then be connected by means of

a PG-joint or a ﬂanged joint as shown in Fig. 3a.

B. By means of a ﬂexible connection secured to the unit casing with

self-tapping screws. The duct can then be connected by means of

a PG-joint or a ﬂanged joint as shown in Fig. 3b.

C. By means of a collared duct with sheet steel angles at the corners.

CONNECTION OF DUCT TO THE FAN OUTLET

INSTALLATION PRINCIPLE

All connections should be ﬁtted edge-to-edge with the back plate of

the fan. N.B. Not all connection facilities are shown, see Fig. 4 and 5.

EUL(B,F) 7

CONNECTION TO THE INLET/OUTLET DUCT

Ducts can be connected to the connection parts of the unit in accord-

ance with one of the examples shown in Fig. 3.

Important!

For all alternatives, make sure that the deadweight of the duct

system is not applied to the unit casing.

ELECTRICAL CONNECTIONS

Electrical connections are to be carried out by an authorized electrician.

Use a rubber insulated cable but do not run the cable through the in-

spectiondoor.

Use a trepanning drill, for instance, for drilling a hole for the cable

gland at a suitable point on the casing. The cable gland can be ar-

ranged as shown in Fig. 7.

SAFETY ISOLATING SWITCH

The fan should be equipped with a safety isolating switch such as

the LQLZ-17. Always open the safety isolating switch before doing any

work on the fan.

The safety isolating switch should be located at a point that enables

the fan to be withdrawn without having to disconnect the electrical

connections. Do not use the safety isolation switch as an operating

switch.

Fig. 8

Fig. 3a Fig. 3b Fig. 3c

EUL(B,F) 6

EUL(B,F) 4A

EUL(B,F) 4B

EUL(B,F) 4C

Connection piece Flexible connection Counterﬂange Duct

LQLZ-03 LQLZ-02 LQLZ-04

Connection piece Flexible connection Counterﬂange Duct

LQLZ-03 LQLZ-02 LQLZ-04

EUL(B,F) 5A

EUL(B,F) 5B

EUL(B,F) 5C

Fig. 5

Fig. 6 Fig. 7

EUL(B,F) 5;1

EUL(B,F) 5;3

EUL(B,F) 5

EUL(B,F) 5;2

Fig. 4

LQLR Fan - Installation instruction

FläktGroup DC_9142GB 20180319_R0

Specifications are subject to alteration without notice

GUARDS

The provisions of the EEC Machinery Directive concerning guards must

be met. This means that the fan must be equipped with screen protec-

tion for belt drive and inlet or screen protection (requiring tools to dis-

mantle it) behind the inspection cover or a door lock.

TO ADJUST THE V-BELT TENSION

The belts must be correctly tensioned to ensure good contact with the

pulleys. If insufﬁciently tensioned, the belts may slip, and if excessively

tensioned, the motor and fan bearings may be overloaded. When cor-

rectly tensioned, the belt deﬂection L will be 15 mm per metre of dis-

tance between centres (c/c) when a force P (N) is applied.

The deﬂection and force should preferably be measured by means of

a tensiometer (see Fig. 9 and 10). The force P is dependent on the belt

type as shown in the table below.

Fig. 9



c/c



EUL(B,F) 10

012 34 56 cm N

120 100 80 60 20

EUL(B,F) 11

1) New belts.

TO CHANGE THE BELTS

To change the belts, ﬁrst move the motor towards the fan by a sufﬁ-

cient amount to enable the old belts to be easily prised off the pulleys

and the new belts to be prised on. Change all the belts at the same

time. Use matched belts (with the same production number), i.e. belts

of exactly the same length.

Tension the belts according to the instructions on this page and align

them as shown in Fig. 11.

Retension the belts after 30 minutes of operation.

Fig. 11

EUL(B,F) 14

Fig. 10

MOVING THE MOTOR TO ADJUST THE BELT TENSION

The belt tension can be adjusted by moving the motor.

1. Remove the belt guard, if ﬁtted.

2. Slightly back off the 4 mounting screws.

3. Use the tensioning screws to adjust the belt tension.

4. Check the alignment of the drive. Align by means of the adjustment

screw.

5. Retighten the mounting bolts.

6. Reﬁt the belt guard if one was ﬁtted

Fig. 12

Tensioning screw

Tensioning pad

Adjustment

screw

Mounting bolt Slide rail

Mounting screw

Belt section Effective diameter of

smaller pulley, mm

P in N/belt

Normal Max1)

SPZ 67-95 10 15

SPZ 100

≤

15 20

SPA 90-132 20 27

SPA 140

≤

28 35

SPB 160-224 35 50

SPB 236

≤

50 65

SPC 224-355 60 90

SPC 375

≤

90 120

LQLR Fan - Installation instruction

FläktGroup DC_9142GB 20180319_R0

Specifications are subject to alteration without notice

BELT PULLEYS

TO REMOVE AND REFIT THE BELT PULLEY

Never hammer the belt pulley onto or off a shaft, since even light

blows and shocks may damage the bearing, which will give rise to

noise and an abnormally high rate of wear.

TO REMOVE:

1. Remove the screws, oil them sparingly and screw one of them into

the extractor hole, i.e. the tapped hole in the bush (see Fig. 13 and 14).

2. Tighten the screw until the bush is free of the hub and the unit is

free of the shaft.

3. Remove the pulley and the bush from the shaft as one unit.

TO FIT:

1. Clean the bore of the pulley and the inside and outside of the bush to

remove any anti-corrosion agent, and make certain that the surfaces

are completely free from oil and dirt. Fit the bush into the pulley.

2. Oil the screws sparingly and loosely screw them into the tapped

holes in the pulley (see Fig. 13).

3. Clean the shaft and ﬁt the pulley and bush onto the shaft as one

unit.

4. Tighten the screws alternately until they are all securely tightened.

Fig. 13

Fig. 14

EUL(B,F) 15

Extractor hole

Screw Screw

EUL(B,F) 12

CHECKS TO BE MADE PRIOR TO STARTING THE FAN

– that the fan section is connected to the ducting or equipped with

necessary LQLZ-04/08 protective screen, Fig. 1, page 1, on the fan

inlet and fan outlet.

– that an authorized electrician has given approval for commissioning

the unit.

– that the fan impeller rotates freely and that no objects which can

be drawn in and damage the fan have been left in the in stallation.

STARTING THE FAN

The fan must not be started with the damper on the suction or delivery

side closed. However, the motor can be brieﬂy energized with the in-

spection cover open for checking the direction of rotation.

CAUTION!

When commissioning a new unit, check the belt tension

and adjust, if necessary, after 30 minutes of operation.

STORAGE BEFORE INSTALLATION

The storage area must not be exposed to vibrations from the sur-

roundings of a kind which can give bearing damage.If the storage

period exceeds 3 months, the belt drive tension should be released

and the fans should be rotated by hand at regular intervals.

LQLR Fan - Installation instruction

FläktGroup DC_9142GB 20180319_R0

Specifications are subject to alteration without notice

The q-DYSA®ﬂow sensor is supplied if the LQLB and LQLF fan is or-

dered with ﬂow sensor (code sufﬁx d = 5, 6).

The accuracy of the ﬂow sensor is ± 7% of the differential pressure

reading provided that the installation and maintenance instructions are

observed. The analogue indicator instrument shows the air pressure in

/sec.

INSTALLATION

Vertically mount the instrument on a wall or against a panel on the unit

and secure it by means of the screws supplied. The horizontal position

of the instrument can be adjusted by means of the built-in level.

FILLING WITH MANOMETER LIQUID

Back off the resetting screw completely and then screw it in three full

turns. This will enable zero setting adjustment in both directions. Re-

move the ﬁlling screw. Fill the instrument with the manometer liquid

supplied, pouring the liquid into the ﬁller hole until the level of liquid

reaches the zero setting.

CHECKS

The zero setting of the manometer should be checked at regular in-

tervals. To check the zero setting, remove the hoses connected to the

pressure connections of the manometer. Whenever the need arises,

use the resetting screw to adjust the zero setting. Top up with ma-

nometer liquid, if required

The measurement nozzle should be blown clean with compressed air

once or twice a year depending on the quality of the air. This can eas-

ily be done by disconnecting the hoses from the instrument and blow-

ing them with compressed air to free the air passages from impurities.

Another type of pressure gauge may also be connected for use as an

alternative meter or for checking the performance of the ﬂow indicating

instrument. In this case, ﬁt T-nipples in the hoses to the indicating in-

strument and run hoses from them to the pressure gauge. The air ﬂow

can be calculated by the expression:

q = 1 · √ Δp

where the value of k is stated on the unit rating plate and Δp is the

measurement pressure in Pa.

TEMPERATURE CORRECTION

The ﬂow scale on the indicator instrument and the above ﬂow equation

are applicable to air at a temperature of +20 °C. At other air tempera-

tures, the ﬂow must be corrected with the formula:

q = q

· √ (273 + t) m

293

where q = the actual ﬂow through the fan, q

= the ﬂow reading and

t = the present temperature in °C.

AIR FLOW MEASUREMENT WITH Q-DYSA® AND ANALOGUE FLOW INDICATING INSTRUMENT

EULF-11

Filling screw

Level

Resetting screw

Flow indicating instrument

Flow sensor

q-DYSA®

Reﬁt the ﬁlling screw and tighten it. If you have ﬁlled the instrument

with too much manometer liquid and cannot adjust the zero setting to

the proper position, insert a pipe cleaner or the like in the ﬁller hole to

remove excessive liquid or pour out a slight amount of liquid.

HOSE CONNECTIONS

The 4 mm i.d. hoses supplied should be cut to the appropriate length

and should be connected from the nipples on the upper frame mem-

ber on the inspection side to the nipples on the instrument, plus to

plus and minus to minus. Fasten the hoses as appropriate so that they

cannot be damaged or kinked.

CAUTION!

Do not use any type of liquid other than the manometer

liquid supplied. Use the resetting screw for ﬁne adjust-

ment of the zero setting.

FläktGroup LQLR Fan Installation guide

FläktGroup LQLR Fan Installation guide

FläktGroup LQLR Fan Installation guide

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