Kruger IJA Instruction manual

IGB048.E2/2007
General Instructions
(Induced Jet Fan)
IJA, IJB, IJC II

1
1 INTRODUCTION
Kruger Axial (IJA, IJB) and Cased Centrifugal (IJC II) Induced Jet Fan is special
design fan to achieve high impulse throw of discharging air. IJA & IJB fan consists of an
attenuator at the suction and discharge side, pre-designed inlet & outlet guide vane.
Kruger Induced Jet Fans are also tested and certified by TUV SUB PSB Pte Ltd in
compliance with the requirement of Standard EN 12101-3: 2015 for the following
temperature ratings;
Class Ff250 (250ºC for 120 mins)
Class F300 (300ºC for 60 mins)
Class Ff300 (300ºC for 120 mins)
Class F400 (400ºC for 120 mins)
Kruger Induced Jet Fans has been manufactured to the rigorous standards of production
and quality control in accordance with the International Quality Standards ISO 9001. All
components have been checked and tested at the end of the manufacturing process.
The purpose of this manual is to aid the user in the proper storage, installation,
operation and maintenance procedure to ensure maximum equipment life and trouble
free operation. These instructions are intended to supplement good general practices
and are not intended to cover detailed instruction procedures.
Handling and maintenance should always be performed by experienced and trained
personnel or technician.
2 RECEIVING, HANDLING AND STORAGE
Rough handling during shipment and improper storage can cause damage that is not
noticeable until the fan is in operation. This can be avoided with proper storage and
handling techniques.
Fan should be hoisted with slings placed around the fan housing. Touch up the scratch
coated surfaces during lifting, to prevent corrosion to occur at this area. Store the fan in
a clean and dry place, preferably indoor to ensure fan shaft, bearing and fan casing are
protected against dust and corrosion. Do not store the fan in a location where it will be
subjected to vibration. This can cause the internal surface to rub against each other and
damage the bearings.

2
3 INSTALLATION
1) Induced Jet fans are shipped mostly assembled, however final checking and
adjustments are required prior to hanging the fans to the ceiling.
2) Induced Jet fans should be installed close to the ceiling but below the beam and
free any obstruction at the inlet and discharge.
3) Induced Jet fans shall be installed to its proper location and position in accordance
to the final drawing used in the CFD simulation.
4) All electrical work must be done in accordance with all applicable electrical codes,
by a qualified electrician.
5) Connect the power termination in accordance to the motor nameplate and supply
voltage. Wiring diagram is shown in Section 3.2.
6) Ensure that the fan impeller rotates freely.
3.1 Installation Method

3
3.2 Wiring Diagram
Jet fans are installed with a single speed or 2 speeds motor.
3.3 Vibration Isolator Installation
1) Select proper isolator.
(Spring Isolator can be selected from Kruger selection program or isolator
catalogue)
2) Adjust deflection based on the selected isolator.
3) Maintain the operating / free height at the same level through step 2.
(The entire assembly must be levelled)
4) Check all the deflection and operating / free height is properly maintained.

4
4 START-UP
4.1 Start-up Checklist
Before putting any fan into the initial operation the manufacturer’s instruction must be
followed. Complete the following checklist to make sure the fan is ready to run.
 Lock out the primary and all secondary power sources.
 Make sure that all fasteners and screws are properly tighten.
 Spin impeller to see whether it rotates freely and is not grossly out of balance.
 Inspect impeller for correct rotation for the fan design.
 Make sure the inlet (and outlet for IJA & IJB only) protection nets are properly
installed & fastened.
 Switch on the electrical supply and allow the fan to reach full speed.
 Check carefully for:
1. Direction of rotation
2. Excessive vibration
3. Unusual noise
4. Proper amperage and voltage values
If any problem is arises, SWITCH OFF IMMEDIATELY. Lock out electrical supply, check
carefully for the cause of trouble and correct as necessary.
4.2 Start-Up
The fan may now be put into operation but during the first 8 hrs of running, it should be
periodically observed and checked for excessive vibration and noise. Checks should be
made of motor input current and motor & bearing temperature to ensure that they do
not exceed manufacturer’s recommendation. After 8 hrs of operation, the fan should be
shut down to check the following items: -
1. Hanger, screws and bolts
2. Impeller condition
3. Motor alignment
4. Motor temperature

5
5 TROUBLE-SHOOTING
5.1 Fan is developing or emitting abnormal or excessive noise
Problem Possible Cause Remedy
Motor
1)
Lean-in cable not secure
2) Noisy motor bearings
3) Single phasing a 3 phase motor
4) Low voltage
5) Cooling fan striking shroud
6) Electromagnetic fault in motor
7) AC hum in motor or relay
8) Starting relay chatter
1)
Fasten the cable properly
2) Replace bearings
3) Check power supply
4) Check power supply
5) Check motor assembly
6-8) Replace motor
Fan
Components
1) Impeller loose on shaft
2) Impeller unbalance
3) Impeller not in center
4) Blade broken/damaged
IJC II Only:
5) Impeller in contact with inlet
cone
6) Impurities or foreign material
inside fan housing
1) Tighten impeller
2) Balance impeller
3) Adjust impeller to center
4) Replace blades
IJC II Only:
5) Correct inlet cone position
6) Clean inside fan and impeller
5.2 Fan is vibrating excessively
Problem
Possible Cause
Remedy
Impeller
1) Impeller unbalanced due to
deposits (dirt or grease)
2) Impeller unbalanced due to
wear
1) Clean impeller, rebalance the
fan
2) Replace impeller

6
5.3 Required thrust not achieved
Problem Possible Cause Remedy
Impeller
1) Impeller/inlet dirty or clogged
2) Improper running clearance /
inlet cone to impeller fit
3) Impeller installed or running at
wrong direction
4) Incorrect speed of impeller
because of:
i) Wrong motor speed
ii) Wrong calibration of inverter
IJA & IJB Only:
5) Improper blade setting
1) Clean the impeller or inlet
2) Change to correct clearance
3) Change to correct rotation by
changing poles of electrical
feed line to motor
4) Change to correct speed:
i) Change motor
ii) Adjust inverter calibration
IJA & IJB Only:
5) Adjust to correct angle
System
1) Obstructions near fan outlet or
inlet
1) Clear obstruction / review CFD
simulation fan positioning
5.4 Fan does not start or operate
Problem Possible Cause Remedy
Electrical
Supply
1) Blown fuses
2) Electricity turned off
3) Wrong voltage
4) Failure of one or two phases
5) Low voltage, excessive line
drop or inadequate wire size
1) Check fuses/circuit breakers
2) Check for switched off or
disconnected
3) Check for correct power supply
4) Check for correct power supply
5) Check for correct wire size
Motor
1) Motor not correctly connected
2) Load inertia too large for motor
3) Motor protection unit or switch
are stopping as temperature
are too high
4) Motor too small and overload
protector has broken circuit
1) Connect the motor according to
the motor label
2) Change motor
3) Reduce temperatures, check
and change insulation class,
increase motor rating
4) Change motor

7
5.5 High power absorption
Problem Possible Cause Remedy
Impeller 1) Blade angle/wheel rotation not
set properly
1) Adjust blade angle/wheel
rotation
Motor
1) Faults in the motor windings
2) Motor power supply voltage
lower than the value indicated
on the identification plate
1) Replace motor
2) Check with motor supplier
Gas Density
1) Calculated horsepower
requirements based on lower
air density (e.g. High
temperature) but actual air
density is higher
(e.g. Cold start up)
1) Check selection
6 ROUTINE MAINTENANCE
Maintenance should always be performed by experienced and trained personnel. Do not
attempt any maintenance on a fan unless the electrical supply has been locked out or
tagged out and the impeller has been secured.
Under normal circumstances, handling clean air, the system should require cleaning only
about a Year. However, the fan and system should be checked at regular intervals to
detect any unusual accumulation.
The fan impeller should be specially checked for build-up of material or dirt which may
cause an Imbalance with resulting undue wear on bearings and belt drives. A regular
maintenance program should be established as needed to prevent material build-up.
Periodic inspection of the rotating assembly must be made to detect any indication of
weakening of the rotor because of corrosion, erosion, or metal fatigue.

R U G E R G R O U P
(
V E N T I L A T I O N
)
• THAILAND (Regional HQ) • AUSTRALIA
KRUGER VENTILATION INDUSTRIES ASIA CO. LTD. S&P-KRUGER AUSTRALIA PTY LTD
30/159 Moo 1, Sinsakorn Industrial Estate, 2 Cunningham St, Moorebank N.S.W. 2170
Chetsadawithi Road, Khok Kham Mueng, Samuthsakorn 74000, Thailand Tel. [phone]
Tel. [phone] - Fax [phone] Fax. [phone]
Website: www.krugerfan.com Email: [e-mail]
·BEIJING) • CHINA (GUANGZHOU)
BEIJING KRUGER VENTILATION CO. LTD GUANGZHOU KRUGER VENTILATION CO. LTD
Level 7, A Block, Rising International Building, 29 JingHai San Road, BDA, No. 9 Huahui Road, Huashan, Huadu,
Beijing, P.R.China 100176 Guangzhou, P.R. China 510880
Tel. [phone] - Fax [phone] Tel. [phone] - Fax [phone]
Email: [email protected] Email: [email protected]
·CHINA (SHANGHAI)
• CHINA (TIANJIN)
SHANGHAI KRUGER VENTILATION CO. LTD TIANJIN KRUGER VENTILATION CO. LTD
No. 500 Yuanguo Road, Anting, Jiading, No.168 Anyuan Road, Jingjin Science and Technology Park
Shanghai 201814 P.R. China Wuqing District, Tianjin, China
Tel. [phone] - Fax [phone] Tel. [phone]/3481 - Fax [phone]
Email: [email protected] Email: [email protected]
• CHINA (WUHAN) • DUBAI
WUHAN KRUGER VENTILATION CO. LTD KRUGER VENTILATION INDUSTRIES, GULF BRANCH
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Fax [phone] Fax. [phone]
Email: [email protected] Email: [email protected]
• HONG KONG • INDIA
KRUGER VENTILATION (HONG KONG) LIMITED KRUGER VENTILATION INDUSTRIES (INDIA) PVT LTD
Flat C, 9/F, Yeung Yiu Chung (No.8) Industrial Building, Kruger Centre, Mumbai-Nasik Highway,
20 Wang Hoi Road, Kowloon Bay, Kowloon, Hong Kong Kalamgaon, Shahapur, Thane 421601, Maharashtra, India
Tel. [phone] - Fax [phone] Tel. [phone] - Fax [phone]
Email: [email protected] Email: [e-mail]
• INDIA (NORTH) • INDONESIA
KRUGER VENTILATION INDUSTRIES (NORTH INDIA) PVT LTD P.T. KRUGER VENTILATION INDONESIA
Plot No. - 191, Sector - 59, Ballabgarh, Faridabad - 121 004, Haryana, India JL. Teuku Umar No.20,
Tel. [phone] Karawaci - Tangerang 15115, Indonesia
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• KOREA • MALAYSIA
NEOMATE CO. LTD KRUVENT INDUSTRIES (M) SDN BHD
2-1010, Ace High Tech City B/D, 775 Gyeongin-ro, Lot 850, Jalan Subang 7, Taman Perindustrian Subang,
Yeongdeungpo-gu, Seoul, Korea. Postal Code 07299 47500, Subang Jaya, Selangor D.E.
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Email: [e-mail]
Email: [email protected]
• MYANMAR • PHILIPPINES
KRUGER VENTILATION (MYANMAR) CO.LTD KRUGER M&E INDUSTRIES CORPORATION
Room No. F21, Thiri Yadanar Whole Sale Market, (Htawunbe) FAPI Compound, E. Rodriguez Ave.
Toe Chae Ward, North Okkalapa Township, Yangon. Tunasan, Muntinlupa City 1773, Philippines
Tel. [phone] Tel. [phone] - Fax [phone]
Email: [e-mail] Email: [email protected]
• SINGAPORE • TAIPEI
KRUGER ENGINEERING PTE LTD KRUGER VENTILATION (TAIWAN) CO. LTD
No. 10 Buroh Street #06-06, West Connect Building, No. 157, Ping-an Rd, Hengfeng Village,
Singapore 627564 Dayuan Shiang Taoyuan County 337, Taiwan
Tel. [phone] - Fax [phone] Tel. [phone] - Fax [phone]
Email: [email protected] Email: [email protected]
• THAILAND • VIETNAM
KRUGER VENTILATION IND. (THAILAND) CO. LTD KRUGER VENTILATION INDUSTRIES (VIETNAM) CO. LTD
30/105 Moo 1, Sinsakorn Industrial Estate, Lot A7. 2-4, C2 Road, Thanh Thanh Cong IZ,
Chetsadawithi Road, Khok Kham Mueng, Samuthsakorn 74000, Thailand Trang Bang Dist. Tay Ninh Province, Vietnam
Tel. [phone] - Fax + 662 1050370-2 Tel. [phone]/02 - Fax [phone]
Email: [email protected] Email: [email protected]
CHINA (