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GB.BCRWD.050101
Specifications are subject to alteration without notice. www.swegon.se 1
BASIC Instructions
BCRWR Fans, Sizes 004–027
1. General
The BCRWR Basic Wing is a belt-driven fan of axi-centrifugal
design. The fan offers excellent power efficiency, low and
uniform outlet air velocity, low sound emission and has a short
overall length.
The BCRWR is available for the size 004–027 BASIC units.
The velocity inside the outlet duct is low (max. 6 m/s) and
uniform. This means minimal system losses. The low dynamic
pressure (max. 22 Pa) also enables a lower total pressure
drop in the system of ducting compared with a conventional
centrifugal fan.
Less space is required in the fan room since functional sections
and sharp duct bends can be fitted directly to the fan outlet
without appreciable pressure loss. This also means savings on
energy since no pressure is needlessly lost.
The fans have, as standard, integrated flow measuring equip-
ment. The measuring inaccuracy is ± 5%.
The size 004-014 fans can be installed for a vertical air flow.
1.1 Specification
The version, size and other particulars are specified in the
delivery documents.
System losses are minimised thanks to the low air veloc-
ity and uniform air distribution pattern at the fan outlet.
Sharp duct bends can therefore be directly fitted to the
fan outlet with only marginal pressure losses.
1.2 Design
The fan is designed without any fan casing.
The fan support is a construction of profiled sections and the
entire fan insert is withdrawable from the casing of the size
014 and smaller units. The design with rubber anti-vibration
mountings and flexible connections provides highly effective
vibration isolation from the unit casing. The flexible connec-
tion is available in two variants: standard plastic fabric or glass
fibre coated with aluminium. The Basic Wing fan is patent
pending.
1.3 Motors
Standard single-speed or two-speed motors can be selected
for operating the BCRWR fans. If the need arises, the BCRWR
can also be equipped with double motors. For effective motor
cooling, the ambient air temperature must not exceed 40 ºC.
The fans as well as the motors have bush-type belt pulleys for
fast belt replacement if, for example, a fan speed adjustment
is necessary.
The bearings are sized for 40,000 hours of operation.
1.4 Belt Drive
The belt drives are available in two variants:
– Standard, V-belt drives
– Poly-V belt drives
1.4.1 V-belts
The efficiency of a correctly sized and installed V-belt drive is
between 90% and 96%, depending on the output consumed
to drive the fan (94–96% at outputs above 3 kW).
They have an estimated useful life of 25,000 hours, which is equiva-
lent to 2.5 years operating around the clock, provided that the trans-
mission has been optimally sized and correctly installed.
Their greatest advantages: Their cost price is low and they are
universally available on the market.
They can be utilized on all the sizes.
1.4.2 Poly-V belts
The estimated useful life of poly-V belts is about twice as long
as that of narrow V-belts.
Smaller belt pulleys and larger transmission ratios can be used,
the bearing sizes limit our application.
Greatest benefit: Better efficiency, 96–97%.
They can be utilized on all the sizes.
BCRWR
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2.3 Commissioning
2.3.1 General
The fan should be commissioned by qualified personnel
only.
First check that all the dampers in the system of ducting are
open. Then start the motor. Check that the fan is rotating in
the direction indicated by the direction of rotation arrow. If
it isn't, check the order of the phase conductors.
Check that the fan motor doesn't consume more power
while operating under normal conditions than the rated
current and that the current in the phases has the same
amperage.
2.3.2 Functional checks while commissioning
While commissioning, check how the fan is operating and
adjust the installation in accordance with the project design
instructions.
In Sweden, a special report must be drawn up by specific
qualified staff in accordance with the Statute concerning
Functional Checks of Ventilation Systems.
Get in touch with your nearest Swegon Service Representa-
tive for particulars about who is qualified.
2.3.3 Manometer connection and adjustment
Measurement probes for adjusting the air flow have been
factory-fitted at each fan. Hoses interconnect the measure-
ment probes with the measurement tappings on the air
handling unit inspection doors for fans.
Connect a manometer across hoses to the measurement
tappings. Mount the manometer at a suitable location on
the air handling unit where it will not obstruct inspection
or the replacement of functional components.
2.2 Connection to the system of ducting
The fan can be connected to a duct or an outlet as fol-
lows:
Warning!
Make sure that neither the flexible connection nor
the internal insulation obstructs the air flow in the
vicinity of the fan outlet.
2. Installation
2.1 Electrical connections
The cables to the fan motor must be run through cable
glands fitted in a suitable fixed panel. If the cables are run
through a fixed panel next to an inspection door, this must
be carried out in such a way that it will be possible to remove
the fixed panel in order to inspect the fan and withdraw it
for periodic servicing. The connection to the motor must be
according to local regulations. Locate the safety isolating
switch, if required, near the inspection door.
CAUTION! Do not install the safety isolating switch
on or the cable gland in inspection doors.
Alt. 1
Alt. 2
Self-tapping
screw or popnit
BCXZ-1-aaa-23 Connection frame
BCXZ-1-aaa-17 Flexible connection
Gasket
Gasket
Duct
BCRW
Fan
BCXZ-1-aaa-22 Connection frame
Gasket
Duct
BCRW
Fan
GB.BCRWD.050101
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3. Maintenance
3.1 Cleaning
Check at least twice a year whether the fan section, motor
and impeller need to be cleaned. The normal interval for
cleaning is approx. once every 12 months.
The inside of the fan section can be vacuum cleaned.
Impurities on the impeller can be removed by vacuum clean-
ing or by washing using a mild, non-caustic cleaning agent
depending on the nature of the impurities.
Keep the motor clean to prevent dust from collecting on its
surfaces and interfering with cooling. Brush off the motor or
carefully clean it using mild, noncaustic cleaning agent.
3.2 Balancing
Check the impeller for correct balance once a year.
3.3 Lubricating the motor bearings
The bearings in the smaller motors are permanently lubricated.
The larger motors have grease nipples and directions on
how to lubricate the bearings appear in the accompanying
motor instructions.
If the fan is operated across a frequency converter, see the
instructions from the motor manufacturer.
3.4 Fan shaft bearings
The bearings for the fan shaft in the fan sections of size 014
and smaller units are permanently lubricated. The fan shaft
bearings of the size 020 and 027 units must be lubricated
at the following intervals:
3.5 Removing the bearings
Before removing the bearings, see the instructions for each
bearing. The bearing and rubber ring specified below for
ordering spare parts.
Size Shaft dia. Bearing, Bearing, Rubber
mm* driving side non driving side ring
004–014 35 6207-2RS1 6207-2RS1 312528-02
*At the bearing position
Listen! Examine! Feel!
3.6 Inspecting the bearings
Check the condition of the motor and fan bearings twice
a year while you check whether the fan and motor need
to be cleaned.
Check that grease hasn't leaked out through defective seals
or inadequately tightened plugs.
Listen to the bearing by holding a stick of wood, screwdriver
or a similar tool against the bearing casing. Press your ear
against the tool and listen. A healthy bearing emits a soft
purring sound whereas a damaged one emits a harsh, often
irregular and rumbling sound.
Check the temperature of the bearing with a thermo-meter,
heat-sensitive crayon or by feeling the bearing casing with
your hand.
If the temperature seems abnormally high or suddenly
changes, this is a sign of impaired bearing performance.
This can be due to too little or too much grease, impurities,
overloading, bearing damage, clamping, excessive friction
in the seals or ambient heat absorption.
However, keep in mind that a natural rise in bearing tem-
perature often occurs after topping up with lubricant. This
condition can last for 1 – 2 days.
Size Shaft dia. Bearing, Bearing, Quantitiy of
axel mm* driving side non driving side lubricant (g)
020-027 40 D40L LAB D40F LAB 10
Rec. intervals in operating hours between lubrication of the
BCRWR fan shaft bearings for various speeds
Size 3000 2000 hours
020 - 027 < 1400 1400 - 1800 r/m
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A
P
3.7 V-belt drive
The belt drive can be of V-belt or Poly-V belt type.
While inspecting and adjusting the drive, it is important to
check the condition of the drive belts, the belt tension and
whether the pulleys are properly aligned.
To tension the belts
The belt tension should be checked at the following inter-
vals:
1. Whenever you fit new drive belts or commission a new
unit. Also, when starting up a unit that has been switched
off for a longer period.
2. After the initial two minutes of operation.
3. After approx. 50 hours of operation.
4. Once every six months.
PLEASE NOTE that belt elongation mostly occurs after the first
hours of operation. Frequent checks are therefore important
when new drive belts are commissioned.
If the air contains impurities such as oil mist or solvents or
if the temperature exceeds +40 °C, the belt tension should
be checked more often.
Slack drive belts are likely to slip and excessively tensioned
belts may damage the motor and fan bearings. If hammer
blows are applied to the belts, the belts should slightly recoil
and feel resilient. They must not feel slack and lifeless.
Correct belt tension should be checked as follows:
1. Measure the distance A between the shaft centres.
2. Measure the force P required for deflecting the belt 16
mm per metre distance between the centres, perpen-
dicular to the direction of belt movement and about
halfway between the pulleys (see figure). We recom-
mend a Trelleborg Tensiometer or a small fish scale for
this measurement. Use a calibrated meter only.
3. Increase the belt tension if the force is less than P in the
table below or vice versa.
4. The recommended belt tension is 0.8 x Pmax.
Tensioning screw
The belt tension can be adjusted with the tensioning screws
as shown in the illustration below: See also "Belt alignment"
on the next page.
16 mm per meter
distance between the
centres
Force P for 16 mm deflection/m between shaft centres
Dia. of small
Belt profile pulley, dd (mm) P in Newton (N)
SPZ 67 – 95 10 – 15
100 – 140 15 – 20
SPB 160 – 224 35 – 50
236 – 315 50 – 65
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Two motors of optional size (up to the max. permissible
motor size) can be fitted. Secure the motors on each side
of the bearing bracket. Both belt drives have to share one
common fan pulley, i.e. the two inner fan pulley grooves
accommodate the belts from the one motor while the
one outer fan pulley groove accommodates the belt from
the other motor.
3.8 To change the drive belts
If one or some of the belts in use are worn, all the drive belts
will have to be replaced. Otherwise, the new belts will be
subjected to a heavier load because they are shorter than
the worn belts.
Adjust the distance between the pulley centres so that you
can easily fit the new belts onto the pulleys by hand.
Never, under any circumstances, use a bar, screwdriver or any
other tool to pry the belts into the pulley grooves.
The belts must not be lubricated or rosined.
3.9 Aligning the drive belts
Make sure that the shafts are parallel and that the pulleys
do not pitch while you are aligning them.
Check their alignment by placing a straightedge or the like
against both the drive pulley and the driven pulley in full
contact with the side of each pulley.
3.10 To fit the pulleys and bush
The pulleys and bush should be fitted/removed as illustrated
below.
The maximum deviation of the pulleys (A in the figure below)
must not exceed 2 mm per metre distance between the shaft
centres. If the distance between the shaft centres is less than
500 mm, a max. deviation of 1 mm is permissible.
Place the straightedge B with both its edges on pulley C. Align
pulleys C and D so that the deviation A will be minimal.
A
B
C
D
Correct Wrong Wrong Wrong
Remove the screws, insert one of them in the extractor hole — i.e..
the hole with half threads in the bush — and tighten it. This will
loosen the bush.
Then withdraw the loose pulley by hand without the aid of hammer
blows,
FITTING
Clean and degrease all machined surfaces. Fit the pulley and bush
together. Arrange them with the half-threaded holes (2–3 holes)
aligned with one another and insert the screws but don't tighten them.
Fit the pulley and bush onto the shaft as one unit, position them at their
appropriate location and tighten the screws with uniform torque.
REMOVAL
3.11 Double motors
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4. Reference Charts
for Airflow Measurement
The chart below can be used for determining the air flow
on the basis of the manometer reading.
If the AHU is equipped with a rotary heat exchanger, you'll
also have to correct the airflow by applying the appropriate
figure from the Correction Chart.
Pressure, Pa
Air flow, m3/s
Applicable to temperature: t= 20 °C
For other temperatures correct the pressure
reading as follows:
pcorrected = preading x 273 + t
293
BCRWR
Correction Chart
for a rotary heat exchanger
If a rotary heat exchanger is located between the
fan, generating the air flow plotted above, and
the specific point at which you wish to calculate
the air flow, the flow will have to be corrected
using the chart below.
Air leakage and the purging air flow occur from
where the pressure is higher to where it is lower.
The pressure is normally higher on the supply air side
because the air flow from the supply air fan contains
the outdoor air plus the leakage air and purging air
flows while the air flow from the exhaust air fan
contains the exhaust air minus the leakage air and
the purging air flows.
Differential pressure, P1-P3, Pa
Leakage and purging air flow, m3/s
Applicable on the assump-
tion that the purging sector is
correctly set.
004
009
006
014
020, 027
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4.1 Airflow Measurement - BC Fans
airflow
manom.
reading
C
C
C
C
C
( )
⋅+⋅=∆
−
+
∆
=
+
⋅∆=∆
( )
⋅+⋅=∆
−
+
∆
=
+
⋅∆=∆
is the differential pressure for airflow mea-
surement in Pa.
denotes the airflow in m3/s.
Formulas:
The formula is applicable to an air temperature of 20 ºC.
For other temperatures, the following expression must be
used to correct the pressure:
denotes the air temperature in ºC.
flow
flow
flow reading
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5. Dimensions
5.1 Air discharge straight ahead
Size B H L Wgt.,Std* Wgt., EI30*
004 1039 546 853 87 103
006 1259 656 1053 126 149
009 1459 756 1153 165 194
014 1759 906 1253 197 231
020 1946 1026 1353 299 346 *) Weight excl. motor and belt drive.
Size B H K F S U L Wgt.,Std* Wgt., EI30*
004 1039 546 123 300 220 600 880 87 103
006 1259 656 178 300 230 800 1080 126 149
009 1459 756 128 500 330 800 1180 165 194
014 1759 906 203 500 380 1000 1280 197 231
020 1946 1026 213 600 373 1200 1380 299 346
027 2306 1206 213 600 453 1400 1380 349 407
*) Weight excl. motor and belt drive.
5.2 Air discharge upward
/