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
2
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
3
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
L
c/c
P
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
4
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
5
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
m
3
/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
k
m
3
/s
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
20
· √ (273 + t) m
3
/s
293
where q = the actual flow through the fan, q
20
= the flow reading and
t = the present temperature in °C.
AIR FLOW MEASUREMENT WITH Q-DYSA® AND ANALOGUE FLOW INDICATING INSTRUMENT
0
EULF-11
p
Pa
Pa
Pa
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.
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