Hison Axial Flow Fans

Introduction
Hison Marine Axial Flow Fans, formerly know as Howden Fans are ma nufactured to international Quality Standard.
Axial flow fans are available from sizes 305mm to 1800mm diameter, and incorporated with heavy duty marine grade
impellers with aerofoil blades for better efficencies and low er sound level.

Performance
Ranges from 100m 3/hr to 250000m 3/hr and
static pressure up to 125mmwg

Construction
Fans for marine industries and offshore project
are ruggedly constructed to withstand stringent
and hostile enviroment.

Explosion proof motors and spark Resistance

Construction Fans are available on requirement.
Spark Resistant Construction Fans are built in
accordance to AMCA standard 99-0401-86,
Type B Constructions.

Anti-Spark Ring on standard fans is available

on request.

Testing
Performance of fans are tested in accordance to
AMCA Publication 211 and comply with the
requirement of the AMCA Certified Ratings Program.

Sound ratings shown are based on tests and procedures

in accordance with AMCA Publication 300 and 301

Direction of Airflow
Versatility of airflow direction of form 'B' or
form 'A'

Typical Applications Airtrade System certifies that the

Air Conditioning Hison Axial Flow Fans shown herein

Building Ventilation are licensed to bear the AMCA Seal.

Marine Industries The ratings shown are based on tests

Offshore Projects and procedures performed in accordance

Oven Exhaust with AMCA Publication 211 and

Spray Booth Exhaust comply with the requirements of the

Cooling AMCA Certified Ratings Program.

Kitchen Exhaust, etc….

 Hison Axial Flow Fans
Direction of Airflow
Versatility of airflow direction of form 'B' or form 'A'

Surface Coating
Hot Dipped Galvanized to EN ISO 461:1999 which also comply to ASTM A123, A153 and BS 729.
Blasted to SA 2-1/2 and coated with Hi-Built epoxy paint for marine environment and most industries applications.
Special painting to user specification is available up on request.

Impeller
Adjustable Blades angles design to meet varied volume
and pressure system requirements featuring the blade
shank with tapered conical section. The tapered section
fits into a conical slot in the hub, providing a taper lock fit.
A bolt is cast into the blade, projecting into the hub and
is secured on the inside by lock-washer and nut.

Balancing Standard
All fan impellers are statically and dynamically balanced
to ISO 1940-1973 (E) G: 6.3 standards.

Motors
All Fans shall be supplied with totally enclosed, high eff iciency motors of IP 55 degree of protection, foot-mounted
Class F insulation, built to International Standard (IEC)

Special motors such as Explosion Proof, 2 speeds, Class H or D.C. motors are available to suit each specific
application.

Accessories
Separate upstream and downstream guide vanes
Inlet/Outlet Silencers
Mounting Feet
Inlet Cones
Matching Flange
Mushroom Ventilators
Control Damper
Wire Guards
Anti-Vibration Mountings

* Fan silencers are recommended for sound level exceeding 80dBA at 3m distance.
 Hison Axial Flow Fans

FLANGE
FAN DIMENSIONS COWLING DIMENSIONS
DETAIL
FAN THICKNESS J' K'
A B C D (MAX) a b c d e f g h
MODEL T1 T2 MAX NOS
3 248 286 248 286
200 6 205 305 12 6 205 405 115 200 150 325
6 254 292 254 292
3 298 336 298 336
250 6 254 305 12 6 254 455 115 200 150 325
6 305 343 305 343
3 350 388 350 388
300 6 305 356 12 8 305 560 115 200 150 325
6 356 394 356 394
3 400 438 400 438
350 6 355 415 12 8 355 660 115 254 200 380
6 406 444 406 444
3 450 488 450 488
400 6 405 500 12 8 405 710 140 305 200 455
6 456 494 456 494
3 500 538 500 538
450 6 455 600 14 8 455 812 140 356 200 500
6 506 544 506 544
3 550 588 550 588
500 6 505 750 14 8 505 864 150 356 200 510
6 556 594 556 594
3 600 638 600 638
550 6 555 800 14 8 555 915 150 356 250 535
6 606 644 606 644
3 662 712 662 712
600 6 605 850 14 12 605 965 150 356 250 535
6 668 718 668 718
3 712 762 712 762
650 6 655 850 14 12 655 1016 150 356 250 535
6 718 768 718 768
3 762 812 762 812
700 6 705 850 14 12 705 1118 150 400 250 580
6 768 818 768 818
3 812 862 812 862
750 6 755 850 14 12 755 1220 150 455 250 635
6 818 868 818 868
3 862 912 862 912
800 6 805 850 14 12 805 1220 150 455 250 635
6 868 918 868 918
4.5 977 1040 977 1040
6
900 6 905 980 1043 915 18 16 905 980 1043 1524 200 560 560 760
9 9 987 1050 987 1050
4.5 1077 1140 1077 1140
6
1000 6 1005 1080 1143 1065 18 16 1005 1080 1143 1625 200 560 560 760
9 9 1087 1150 1087 1150
4.5 1290 1366 1290 1366
6
1200 6 1205 1293 1369 1220 18 20 1205 1293 1369 2032 250 610 560 865
9 9 1300 1376 1300 1376
4.5 1340 1416 1340 1416
6
1250 6 1255 1343 1419 1220 18 20 1255 1343 1419 2135 250 610 560 865
9 9 1350 1426 1350 1426
6 1493 1569 1493 1569
1400 9 1405 1350 20 20 1405 2500 300 915 762 1185
9 1500 1576 1500 1576
6 1593 1669 1593 1669
1500 9 1505 1400 20 20 1505 2600 300 950 762 1220
9 1600 1676 1600 1676
6 1693 1769 1693 1769
1600 9 1605 1500 20 20 1605 2800 300 1000 762 1270
9 1700 1776 1700 1776
6 1893 1969 1893 1969
1800 9 1805 1600 20 20 1805 3000 350 1200 762 1470
9 1900 1976 1900 1976

Note:
1) The dimensions quoted in this publication are generall y correct, but should be check at the
time of ordering. Hison reserves the right to change design and specifications without notice.
2) All dimensions in mm.
3) Inspection doors are standard for 800mm dia fan and above.
4) Certified dimensions and weights can be furnished after receipt of order.
 500
1500-8-a5
700rpm (50Hz)

FEG63
outlet area = 1.779m 2

400 ρ = 1.2 kg/m3

FAN STATIC PRESSURE - Pa

300

200

100

4o 8o 12o 16o 20o 24o 28o 32o

0
0.0 10.0 20.0 30.0 40.0

AIR VOLUME - m3/s

PERFORMANCE m3/s @ STATIC Pa SOUND POWER DATA (dB)

TOTAL Sound
PITCH Max Overall
EFF. Pressure Level
ANGLE kW Sound
0 100 150 200 270 310 350 405 (%) 63Hz 125Hz 250Hz 500Hz 1.0KHz 2.0KHz 4.0KHz 8.0KHz @3m Q1
Power Level
Directivity
(Lw)
(dBA)
4o 14.94 12.32 10.86 8.83 4.69 2.61 1.25 0.00 4.73 41 88 91 94 96 92 89 78 75 100 77
8o 18.47 15.99 14.37 12.60 7.47 4.04 2.42 0.55 6.08 48 90 92 93 94 91 88 78 76 100 75
12o 21.99 19.53 18.06 16.41 12.32 6.49 3.59 1.41 7.48 56 92 93 92 93 90 86 79 77 99 74
o
16 25.22 22.81 21.41 19.69 16.41 10.97 - - 9.38 58 94 94 91 91 89 85 80 78 100 73
o
20 28.15 25.78 24.38 22.86 19.55 15.87 - - 11.80 59 97 95 90 89 88 84 80 79 100 72
o
24 31.24 28.67 27.19 25.55 21.47 - - - 14.73 56 100 97 92 90 88 84 80 80 103 73
28o 34.34 31.56 30.00 28.00 23.15 - - - 17.89 55 103 100 93 92 89 84 81 80 105 74
32o 37.43 34.38 32.77 30.44 24.87 - - - 21.23 55 106 102 94 93 90 84 81 81 108 75

Airtrade System certifies that the *Performance certified is for installation type D - Ducted inlet, Ducted outlet
model 1500-X-a5 shown herein is *Performance ratings do not include the effects of appurtenances (accessories)
licensed to bear the AMCA Seal. *The AMCA Certified Ratings Seal applies to air performance and the Fan
The ratings shown are based on tests Efficiency Grade ratings only.
and procedures performed in accordance *Sound ratings shown are based on tests and procedures performed in accordance with
AMCA Publication 300 and 301.
with AMCA Publication 211 and comply
with the requirements of the AMCA
Certified Ratings Program. A-1500-X-a5-01-R2, September 2012
 800
1500-6-a5
960rpm (50Hz)

FEG63
outlet area = 1.779m 2

ρ = 1.2 kg/m3

600
FAN STATIC PRESSURE - Pa

400

200

4o 8o 12o 16o 20o 24o 28o 32o

0
0.0 10.0 20.0 30.0 40.0 50.0 60.0

AIR VOLUME - m3/s

PERFORMANCE m3/s @ STATIC Pa SOUND POWER DATA (dB)

TOTAL Sound
PITCH Max Overall
EFF. Pressure Level
ANGLE kW Sound
0 190 280 375 510 585 660 760 (%) 63Hz 125Hz 250Hz 500Hz 1.0KHz 2.0KHz 4.0KHz 8.0KHz @3m Q1
Power Level
Directivity
(Lw)
(dBA)
4o 20.49 16.90 14.89 12.11 6.43 3.58 1.71 0.00 12.20 41 93 96 100 102 101 98 89 83 107 84
8o 25.33 21.92 19.71 17.28 10.24 5.54 3.32 0.75 15.68 48 95 98 99 101 99 97 89 84 107 83
12o 30.16 26.79 24.77 22.50 16.90 8.90 4.93 1.93 19.29 56 98 101 99 100 98 95 89 85 107 82
o
16 34.58 31.29 29.36 27.00 22.50 15.04 - - 24.19 58 100 103 99 98 97 94 89 86 107 81
20o 38.61 35.36 33.43 31.35 26.82 21.76 - - 30.45 59 102 105 99 97 95 92 89 87 108 80
o
24 42.85 39.32 37.29 35.04 29.44 - - - 38.00 56 105 108 101 98 96 93 89 87 111 81
28o 47.09 43.29 41.14 38.40 31.74 - - - 46.15 55 108 111 103 99 97 93 89 87 114 82
32o 51.34 47.14 44.94 41.75 34.11 - - - 54.75 55 111 114 104 100 98 94 89 88 117 84

Airtrade System certifies that the *Performance certified is for installation type D - Ducted inlet, Ducted outlet
model 1500-X-a5 shown herein is *Performance ratings do not include the effects of appurtenances (accessories)
licensed to bear the AMCA Seal. *The AMCA Certified Ratings Seal applies to air performance and the Fan
The ratings shown are based on tests Efficiency Grade ratings only.
and procedures performed in accordance *Sound ratings shown are based on tests and procedures performed in accordance with
AMCA Publication 300 and 301.
with AMCA Publication 211 and comply
with the requirements of the AMCA
Certified Ratings Program. A-1500-X-a5-02-R2, September 2012
 700
1500-8-a5
875rpm (60Hz)

FEG63
outlet area = 1.779m 2
600

ρ = 1.2 kg/m3

500
FAN STATIC PRESSURE - Pa

400

300

200

100

4o4
o
8o 8o 12o 12o 16o 16o 20o 20
o o
24o 24 28
o
28o 32o 32o
0
0.0 10.0 20.0 30.0 40.0 50.0

AIR VOLUME - m3/s

PERFORMANCE m3/s @ STATIC Pa SOUND POWER DATA (dB)

TOTAL Sound
PITCH Max Overall
EFF. Pressure Level
ANGLE kW Sound
0 155 235 315 420 485 550 635 (%) 63Hz 125Hz 250Hz 500Hz 1.0KHz 2.0KHz 4.0KHz 8.0KHz @3m Q1
Power Level
Directivity
(Lw)
(dBA)
4o 18.68 15.40 13.57 11.04 5.86 3.27 1.56 0.00 9.24 41 91 94 98 100 98 95 86 81 105 82
8o 23.08 19.98 17.97 15.75 9.34 5.05 3.03 0.68 11.87 48 94 96 98 99 97 94 86 82 104 81
12o 27.49 24.41 22.58 20.51 15.40 8.11 4.49 1.76 14.61 56 96 98 97 97 96 92 86 83 104 80
o
16 31.52 28.52 26.76 24.61 20.51 13.71 - - 18.32 58 98 100 97 96 94 91 86 84 105 78
o
20 35.19 32.23 30.47 28.57 24.44 19.83 - - 23.05 59 101 102 97 94 93 90 86 84 106 78
o
24 39.06 35.84 33.98 31.93 26.83 - - - 28.77 56 104 105 98 96 94 90 86 85 109 79
28o 42.92 39.45 37.50 35.00 28.93 - - - 34.95 55 107 108 100 97 95 91 87 85 111 80
32o 46.79 42.97 40.96 38.05 31.09 - - - 41.46 55 110 111 102 98 95 91 87 86 114 81

Airtrade System certifies that the *Performance certified is for installation type D - Ducted inlet, Ducted outlet
model 1500-X-a5 shown herein is *Performance ratings do not include the effects of appurtenances (accessories)
licensed to bear the AMCA Seal. *The AMCA Certified Ratings Seal applies to air performance and the Fan
The ratings shown are based on tests Efficiency Grade ratings only.
and procedures performed in accordance *Sound ratings shown are based on tests and procedures performed in accordance with
AMCA Publication 300 and 301.
with AMCA Publication 211 and comply
with the requirements of the AMCA
Certified Ratings Program. A-1500-X-a5-03-R2, September 2012
 1200
1500-6-a5
1170rpm (60Hz)

FEG63
outlet area = 1.779m 2

1000

ρ = 1.2 kg/m3

800
FAN STATIC PRESSURE - Pa

600

400

200

o o
44oo 8o8
o
1212 16o16o 20oo
20 24oo
24 28oo
28 oo
32
32
0
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0

AIR VOLUME - m3/s

PERFORMANCE m3/s @ STATIC Pa SOUND POWER DATA (dB)

TOTAL Sound
PITCH Max Overall
EFF. Pressure Level
ANGLE kW Sound
0 280 420 560 755 865 980 1130 (%) 63Hz 125Hz 250Hz 500Hz 1.0KHz 2.0KHz 4.0KHz 8.0KHz @3m Q1
Power Level
Directivity
(Lw)
(dBA)
4o 24.98 20.59 18.15 14.76 7.83 4.37 2.09 0.00 22.09 41 96 99 103 106 106 103 97 88 111 89
8o 30.87 26.72 24.02 21.06 12.48 6.76 4.05 0.91 28.38 48 99 102 103 105 105 102 97 89 111 88
12o 36.75 32.64 30.19 27.42 20.59 10.84 6.01 2.35 34.92 56 101 104 104 104 103 100 96 90 111 87
o
16 42.15 38.13 35.78 32.91 27.42 18.33 - - 43.79 58 103 106 104 102 101 99 95 90 111 86
o
20 47.05 43.09 40.74 38.21 32.68 26.52 - - 55.12 59 106 109 105 101 100 98 94 91 112 85
o
24 52.22 47.92 45.44 42.70 35.88 - - - 68.79 56 109 112 107 102 101 98 94 91 115 86
28o 57.39 52.76 50.14 46.80 38.69 - - - 83.55 55 112 115 109 104 102 99 94 92 118 87
32o 62.56 57.46 54.77 50.88 41.57 - - - 99.11 55 115 118 111 105 103 99 95 92 120 89

Airtrade System certifies that the *Performance certified is for installation type D - Ducted inlet, Ducted outlet
model 1500-X-a5 shown herein is *Performance ratings do not include the effects of appurtenances (accessories)
licensed to bear the AMCA Seal. *The AMCA Certified Ratings Seal applies to air performance and the Fan
The ratings shown are based on tests Efficiency Grade ratings only.
and procedures performed in accordance *Sound ratings shown are based on tests and procedures performed in accordance with
AMCA Publication 300 and 301.
with AMCA Publication 211 and comply
with the requirements of the AMCA
Certified Ratings Program. A-1500-X-a5-04-R2, September 2012
INSTALLATION, OPERATION AND
MAINTENANCE MANUAL –
ACCOMMODATION
VENTILATION AXIAL FLOW
FANS
 HISON AXIAL FANS

INSTRUCTION MANUAL FOR

AXIAL FLOW FANS
1. PRODUCT WARRANTY
HISON guarantees its products against defects in material and workmanship for a period
of one year from the date of shipment from its factory.

This guarantee is limited to the repair or replacement of products or parts which, in

HISON’S judgement, prove defective and are returned to its factory.

HISON assumes no responsibility for performance of components such as motors,

sheaves, belts or bearings used in conjunction with its products which have not been
manufactured by HISON. Any and all guarantees on components not manufactured by
HISON are limited to terms of guarantees furnished by the respective manufacturers.

HISON will not be responsible if product or part failure is the result of improper
installation, abuse, alteration, incorrect electrical connections, misuse, misapplication,
intentional or inadvertent attempts to operate above rated capacity, lack of proper
maintenance or Acts of God.

HISON assumes no responsibility for the installation of its products or the performance
of any system in which they may be installed. HISON has made no recommendations as
to the compatibility of its products with any system.

Under no circumstances will HISON be responsible for any installation or removal

costs, or for incidental or consequential damages. Claims for labour and/or material
charges will not be honoured unless prior written authorisation has been granted by
HISON.

The above warranty is void if :

1) Electric motors are not factory-installed in the fan or on removable plates designed
for proper alignment when they are re-installed.

2) Prior to installation, products are not stored in a clean, dry place.

3) Field work is performed by others without prior written authorisation from HISON.

4) Systems, controls and related components do not perform in accordance with stated
specifications.

-2-
2. SPECIAL CONDITIONS FOR SAFE USE
1) The Fans must be connected to a suitable ground connection prior to operation.

2) Once installed the Fans must not be allowed to come into contact with iron
steel oxide particles/ flakes.

3. STORAGE
1) Fans and accessories should be stored in a clean, dry location to prevent rust
and corrosion. If such storage conditions are not available the motor anti-
condensation heater (if fitted), should be connected to an appropriate power
supply to prevent motor condensation forming.

2) If outdoor storage is necessary, protection should be provided. The fan should

be covered to prevent the accumulation of dirt and moisture. Cover motors
with waterproof material. Care must be taken to protect motor, bearings and
drive components.

3) If fans are being stored more than 30 days, it is imperative that their impellers
be rotated by hand at least once each week to prevent burnishing of the
bearings due to prolonged time at rest while carrying the impeller load.

4) If equipment is shipped partially assembled, all parts require careful handling

and protection until installed.

5) Precaution should be taken during installation; wooden block at the impeller

side should only be removed after complete installation of fan, to prevent any
damage and distortion

6) Fans should be lifted by the mounting flanges only. Never lift a fan by the
propeller, shaft, motor, motor bracket or any fan part not designed for lifting. A
spreader should be used to avoid damage

Any storage & handling of equipments not according to above recommended procedures
may invalidate all applicable warranties and liability provided by us.

-3-
4. INSTALLATION
If fans are being stored more than 30 days, the resistance of the motor windings to earth
should be measured (at 500V D.C.). Any reading less than 10 megohms the motor
should be dried and re-checked before the fan is switched on.

When installing the fan, be sure to observe the following items and make certain that
they are readily accessible after installation :
1) Motor outside conduit box. (NOTE : Pre-wire motor before installing fan.)

2) Extended bearing lubrication fittings.

3) Access hatch in fan housing.

4) Operator shaft on inlet vane damper assembly.

Where inlet bells, inlet dampers, discharge cones or other accessories are required,
install these devices and tighten all bolts. Check inlet damper operation to be sure all
blades operate freely. Install damper operator (if required).

Install unit in system as required. Be sure to anchor firmly. Units suspended from
overhead should have mounting brackets supported properly for fan size and weight. If
vibration isolators are used, make certain they are the proper type and size and that they
are properly installed.

Make certain there is no foreign loose material in ductwork connected to or leading

from the fan itself.

Make certain the system provides access means at fan inlet and discharge.

Secure all access hatches to fan.

Properly secure all safety guards.

Installation of axial fans with poor airflow conditions near the fan inlet or outlet can
lead to reduced fan’s performance, increased noise levels and possible fan failure.
Some typical causes of poor airflow conditions are walls, elbows, coils, sound traps or
other appurtenances located closer than three fan diameters to either the inlet or outlet of
the fan itself. These conditions must absolutely be avoided at all costs, as any of them
can cause fan failure due to their effect on the impeller blades.

-4-
5. ELECTRICAL CONNECTION
CHECK TO MAKE CERTAIN THAT THE POWER SUPPLY VOLTAGE IS THE
SAME AS THAT ON THE FAN AND MOTOR NAMEPLATES.

If rigid conduit is used, it is recommended that a flexible lead should be brought to the
fan from a convenient junction box. Fan should be properly grounded to meet local
electrical codes.

Overload protection must be incorporated in the electrical system to meet local electrical
codes and to maintain electric motor warranty. Starters and thermal protectors should
be sized to handle 125% of motor nameplate amperage. Wire size should also be
capable of handling 125% of motor nameplate amperage at the fan.

Motor overheat protection (if fitted) can be fitted on both single-phase and three-phase
motors. Overheat protection will be achieved by the use of either thermostats or
thermistors.

In the case of unexpected closure, fan must be connected into a control circuit that will
not allow the fan to restart until the circuit is manually reset.

If fans are to be installed in a system requiring reversible operation, it is recommended

that interlocks be incorporated to prevent the instantaneous reversing of the motors.
Motor life can be greatly extended and to prevent impeller damage by using the
interlock which allows a 120-180 second time delay between reversing phase, thereby
allowing motor to slow down before energizing the circuit in the opposite direction.

If multiple stage units are being used, it is recommended that interlocks be incorporated
to make certain that all stages are in operation, thereby assuring the proper performance
of the fans in the system. Delayed starting of fans in parallel can lead to fan failure.

6. START-UP
Rotate the impeller by hand prior to initial start-up to make certain that it is rotating
freely and that there is no foreign material present which might interfere with its proper
rotation.

-5-
Check to make sure that the proper voltage and heater size is being used and that all
electrical connections are properly made. Energize the starting circuit for a few seconds
and then turn off power. Check to see that the fan impeller is rotating in the proper
direction. If rotating backwards, interchange any two loads to reverse motor rotation
(on three phase systems).

Start fan once again and, while running, check to be sure there is no excessive vibration
and that all flexible connections are airtight.

Adjust all dampers, mixing boxes, sensors, etc., so that system operates properly.

After an eight hour period of satisfactory operation, the fan should be shut down and
inspected to insure that :

1) All set screws, bolts and nuts are tight.

2) Drive is properly aligned and tight.

3) Belt tension is correct.

Check pulley alignment and belt tension.

7. CHECK SYSTEM FOR FAN SURGING

Surging, or stalling from overpressurization, is one problem which must absolutely be
avoided on any system on which axial fans are installed. Surging can occur when new
systems are being started up, as the systems themselves have not been balanced and
there is always a chance that overperssurization followed. Overpressurization can result
in impeller stress, fatigue or failure.

8. OPERATING OF FAN MOTOR

• USE

Disconnect and lock out before working on the motor or the driven equipment. Ensure
no explosive atmosphere is present while the work is in progress.

-6-
The motors are designed for following environmental conditions:
Maximum altitude 1000m above sea level.

If these limits are exceeded, all motor data and construction data must be checked to
equalise the surface temperature with the temperature class according to the ignition
temperature of any gases or dust.

Particular attention must be paid to corrosive atmospheres when using flameproof

motors; ensure that the paint protection is suitable for the ambient conditions as
corrosion can damage the explosion-proof enclosure.

• SAFETY CONSIDERATIONS
The motor is intended for installation and use by qualified personnel, familiar with
health and safety requirements and national legislation.

Safety equipment necessary for the prevention of accidents at the installation and
operating site must be provided in accordance with local regulations.

Small motors with supply current directly switched by thermally sensitive switches can
start automatically.

• POINTS TO OBSERVE
1. Do not step on the motor.
2. The temperature of the outer casing of the motor may be hot to the touch
during normal operation.
3. Lifting lugs must only used for lifting the motor itself. They must not be
used to lift the motor when it is attached to other equipment.

9. MAINTENANCE OF FAN MOTOR

Standards relating to connection and use of electrical apparatus in hazardous areas must
be taken into consideration. Only fully trained personnel competent with these standards
must handle this type of apparatus.
Depending on the nature of work in question, disconnect and lock out before working
on motor and driven equipment. Ensure no explosive gas or dust is present while work
is in progress.

-7-
 • GENERAL INSPECTION
1. Inspect the motor at regular intervals. The frequency of checks depends
on the humidity level of the ambient air, and on the local weather
conditions. This can initially be determined experimentally and must
then be strictly adhered to.
2. Keep the motor clean and ensure free ventilation airflow.
3. Check the condition of shaft seal (e.g. V-ring or radial seal) and replace
if necessary.
4. Check the condition of connections and mounting and assembly bolts.
5. Check the bearing condition by listening for any unusual noise, vibration
measurement, bearing temperature, inspection of spent grease of SPM
bearing monitoring.

When signs of wear are noticed, dismantle the motor, check the parts and replace if
necessary. The shaft seals have to be replaced with seals of same quality and
characteristics as the original ones when changing bearings.

For flame proof motors, periodically turn the knurled head of the drain plug, if
equipped, in order to prevent jamming. This operation must be done when the motor is
at standstill. The frequency of checks depends on the humidity level of the ambient air,
and on the local weather conditions. This can initially be determined experimentally and
must then be strictly adhered to.

A routine maintenance of non-seal type motor bearings is needed. If greasing is

required, an extended greasing point out to fan casing exterior will be provided. A
compatible grease type should be periodically applied in accordance with the
information on motor instructions provided. This detail will provide both the period
between lubrication and the type of grease to be used. Every trace of water and dirt must
be removed from around the grease points and a clean grease gun is used.

-8-
10. FAN INSTALLED WITH DAMPERS OR FILTERS
Fans installed with filters or dampers will need special monitoring as follows:

• FAN INSTALLED WITH FILTERS

1. Filters will need to be checked frequently for massive dirt accumulation.
It will need to be cleaned up or replaced once the filters are found to be
very dirty as it will choke up the system.

• FAN INSTALLED WITH DAMPERS

1. Ensure dampers are open at all times when fan is in operation.

Failing which will result in operating in stall point and causes the fan blades to flutter.
Such circumstances will cause the fan blades to break or motor bearings burnt
whichever is weaker.

11. FAN MODEL

FAN MODEL SAMPLE:

750 - 4 - a2 - 15°
Fan diameter in mm

Number of poles (speed)

Fan hub model

a - aluminum material
p - polypropylene material

Fan blade pitch angle

-9-
 ROUTINE EVERY 6 EVERY 12 INSTRUCTIONS
MAINTENANCE MONTHS MONTHS
SCHEDULE
1. Examine the airways into the * Remove any debris that may have accumulated
fan guards (if fitted). round the guards.
2. Examine motor cooling fins. * Remove any material / dirt build-up between
the motor fins.
3. Examine impeller for dirt * Remove any build-up of dirt. Ensure impeller
build-up and for any physical is secured. Replace impeller if it is damaged.
damage.
4. Check condition and tautness * Clean safety supports. Replace them if there is
of fan safety support chains/ any deterioration/ corrosion.
harnesses/ ropes (if fitted).
5. Examine condition of safety * Clean safety guards and replace them if there
guards (if fitted) and their are any signs of damage.
fixings.
6. Check operation of anti- * Switch off the power to the motor. The anti-
condensation heaters (if fitted). condensation heater should be energised
(drawing current).
7. Grease motor bearings Check requirement in accordance to No. 9
“Maintenance of Fan Motor”.
8. Check the security of all the * Check blades to ensure they are tightly secured
impeller blades. to the hub and impeller tightened to the motor
shaft.
9. Check torque of fan –to- * It is essential to confirm that all fixings are
support fixings. properly fitted (see No. 4 “Installation”)
10. Check movement of vibration * Check freedom of movement and tighten
isolators (if fitted). fixings if necessary.
11. Check motor voltage and * Ensure voltage and full load current are as
current consumption. specified on the motor nameplate.
12. Inspect paintwork / * Ensure any damage areas are treated with
galvanising. suitable anti-corrosion paint.
13. Check fan assembly wiring. * Check security and condition, of all wiring
including earthing.

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