Swegon BCRWR Owner's manual

Brand: Swegon

Model: BCRWR

Type: Owner's manual

Swegon BCRWR is a belt-driven fan of axi-centrifugal design that offers excellent power efficiency and low and uniform outlet air velocity. It has a short overall length and is available for the size 004–027 BASIC units. The velocity inside the outlet duct is low (max. 6 m/s) and uniform, which 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. The fans have, as standard, integrated flow measuring equipment, and the measuring inaccuracy is ± 5%.

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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

Duct

BCRW

Fan

BCXZ-1-aaa-22 Connection frame

Gasket

Duct

BCRW

Fan

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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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4 www.swegon.se

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.

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 reading

GB.BCRWD.050101

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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







  



Swegon BCRWR Owner's manual

Swegon BCRWR Owner's manual

Swegon BCRWR Owner's manual

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