COFIMCO M-MR Series Installation Manual, Fan Maintenance and Operation

Debit Deltafluid
9 November 2018
Flange Thermowell U210 1.5″ 600RF
9 November 2018
View Fullscreen
Installation Manual,
Fan Maintenance and Operation
COFIMCO M-MR Series
M-MR Series – V 3.4 – EN
August 2016
~ 2
COFIMCO axial fans for the world COFIMCO M-MR Series
It is recommended that you carefully read all content of this manual, before
proceeding with fan installation.
IMPORTANT: for systems containing more than one fan, carry out equipment setting
of a single fan and after proper fan operation is identified (as described in this
manual), continue setting up all the other fans.
ATTENTION: COFIMCO M-MR fan series hub and blades are patented components.
The contents of this manual may not be copied, reproduced or printed without written permission
from COFIMCO S.r.l. , which is determined to protect itself from contra actions by all law abiding
means.
Copyright © 2009 – COFIMCO S.r.l., Pombia (NO), ITALY
All rights reserved.
~ 3
COFIMCO axial fans for the world COFIMCO M-MR Series
Manufacturer Declaration
The manufacturer:
COFIMCO S.r.l. via A. Gramsci 62, 28050 Pombia (NO) ITALIA
States:
each axial fan is considered a component and is constructed to be incorporated into a machine or to
be assembled with other machinery to form a machine as requested by 2006/42/EC norm.
~ 4
COFIMCO axial fans for the world COFIMCO M-MR Series
GENERAL TERMS AND CONDITIONS OF SALE
I. GENERAL NOTICE
The following general terms and conditions of sale (hereinafter also the “T&Cs”) shall apply to and regulate
any purchase order, contract or agreement (hereinafter the “Contract”) resulting between Cofimco s.r.l.
(“Cofimco”) and any person, whether legal or natural, who orders or purchases or is offered
products/equipment from/by Cofimco (hereinafter “Buyer” and, together with Cofimco, the “Parties” or,
singularly, the “Party”) and constitute the complete and final agreement between the Parties.
II. TERMS OF PAYMENT
Unless otherwise stated in Cofimco’s order acknowledgment, payment shall become due pro rata as
shipments are made and, namely, each payment will be due and payable at the time of the delivery of the
equipment to the F.A.S. point specified in the Contract, it being understood that Seller may retain the
equipment until payment is made. If Buyer delays shipment, date of readiness for shipment shall be deemed
to be the date of shipment for payment purposes. If Cofimco’s manufacturing is delayed by Buyer, Buyer
shall pay that portion of the purchase price which is equal to the percentage of completion; the balance shall
be payable in accordance with the terms as stated above.
III. TITLE AND RISK OF LOSS
Title to the equipment to be supplied hereunder shall pass to Buyer upon full payment or upon delivery to
the F.A.S. point specified in the Contract, whichever occurs last. Notwithstanding the foregoing, risk of loss
or damage to the equipment shall remain with Cofimco until delivery of the equipment to the F.A.S. point.
If Buyer is unable to take delivery when the equipment is ready for shipment, the equipment will be stored
at Buyer’s expense and risk of loss shall immediately pass to Buyer.
IV. PROPRIETARY INFORMATION
All documents, drawings or writings (“Information”) of any kind or in any form provided to Buyer by
Cofimco are and shall remain the property of Cofimco. Buyer acknowledges that the Information may
contain trademarked, copyrighted or otherwise proprietary and/or confidential concepts, ideas and data, all
of which is and shall remain owned solely by Cofimco. In light of these acknowledgements, Buyer agrees to
keep confidential and treat all information as if Buyer itself held a confidential and proprietary interest in
the Information; to obtain Cofimco`s written permission prior to any disclosure or distribution of the
Information to third parties and/or prior to the incorporation of the Information into any database, network
or other computerized system; and to properly identify and attribute Cofimco`s proprietary interest in the
Information including all appropriate trademark and/or copyright notices, whenever Information is disclosed
or distributed pursuant to this Section. Buyer shall promptly return any Information to Cofimco upon
request and Buyer and its agents shall abide by all nondisclosure terms and other reasonable provisions
required by Cofimco as a condition of visiting any Cofimco facility. Except to the extent that the
~ 5
COFIMCO axial fans for the world COFIMCO M-MR Series
Information may be relied upon by Buyer to use and operate the equipment for its intended purpose(s),
nothing in this agreement shall be construed as an implicit or explicit license by Cofimco to Buyer to make,
use, research and develop, sell, copy, disclose, distribute, or otherwise benefit from the proprietary or
confidential nature of the Information. The rights and obligations of this Section (“Proprietary lnformation”)
shall survive the cancellation, completion or any other termination of this Contract for a period of three (3)
years after the date of said event.
V. WARRANTY
Unless expressly agreed otherwise, in writing in Cofimco’s order acknowledgment, Cofimco warrants that
the equipment delivered hereunder will be free from defects in workmanship and material for a period of one
(1) year from the date of initial startup or eighteen (18) months from the date of shipment, whichever occurs
first.
In case of proved mechanical breakage or defects, Cofimco shall, at its expense, repair or replace, at the
F.A.S. point specified in the Contract, the defective (portion of any) equipment, or, alternatively, Cofimco
may, at its sole discretion, refund to Buyer the price paid for the defective item(s). For the foregoing remedy
to apply, the following conditions shall be met: (i) the defect must occur and be discovered during the
warranty period as set forth above, (ii) the use of defective equipment must be promptly discontinued by
Buyer, (iii) Buyer must return the defective equipment to Cofimco and (iv) Buyer must give Cofimco written
notification within thirty (30) days after Buyer’s discovery of the defect, provided that any alleged or
purported lack of fitness of the equipment or services supplied hereunder consequential upon the failure by
Buyer to supply accurate, complete and reliable information regarding its needs and the technical and
performance specifications and requirements of the equipment shall not constitute a defect hereunder. In any
event, this warranty and remedy shall apply only subject to the further essential condition that Buyer
properly unloads, stores, handles, maintains and installs the equipment, protects the equipment from
damaging agents, and operates the equipment in a normal and proper manner within proper hosting premises,
plant or facilities, in accordance with all due and appropriate standard procedures, in compliance with any
applicable installation, maintenance and operations manual(s) for Cofimco fans and all instructions,
recommendations and indications given by Cofimco at any stage, and not in excess of any applicable rating
limitations, design specifications or technical, operating and dimensional requirements prescribed by the
applicable documentation and drawings. Cofimco makes no warranty whatsoever regarding resistance of
materials to corrosion or erosion. The sole liability of Cofimco and the exclusive remedy of Buyer, whether
arising under contract, tort (including negligence), strict liability or otherwise, arising out of defects in the
services or equipment supplied hereunder, shall be the remedies set forth above. In addition, Cofimco shall
obtain for Buyer the warranties and guarantees provided by the manufacturers of equipment provided by
others, but Cofimco shall have no further liability or responsibility for any equipment supplied by others.
Buyer shall take any and all reasonable actions to mitigate any losses, damages or costs arising out of or in
connection with the supply of equipment by Cofimco, this agreement and the Contract and any possible
liability of Cofimco shall be limited and reduced accordingly and shall in no event include any losses,
damages or costs which could have been prevented, avoided or mitigated by prompt, appropriate and diligent
action by Buyer or by giving prompt notice to Cofimco.
Unless expressly agreed otherwise in writing in Cofimco’s order acknowledgment, Buyer and Cofimco agree
that, in consideration of the express warranties above, all other warranties and guarantees, whether express or
implied, whether arising under law, equity or custom of trade, including warranties of merchantability and
fitness for a particular purpose, are excluded from these T&C and the Contract.
~ 6
COFIMCO axial fans for the world COFIMCO M-MR Series
VI. FORCE MAJEURE AND DELAY IN PERFORMANCE
Except for the payment of monies due hereunder or as otherwise set forth, neither party shall be held liable
for any expense, loss, damage, failure to perform, delay in performing, or for any possible mechanical
breakage or defect resulting from delay or prevention of performance caused by a Force Majeure Event or
other circumstances outside Cofimco’s control such as, without limitation, hostilities, restraint of rulers or
peoples, revolution, civil commotion, strike, shortages of labor, energy, fuel, machinery or materials,
technical or yield failures, epidemic, accident, fire, flood, wind, earthquake, explosion, blockade or
embargo, lack or failure of transportation facilities, actions of the other party, failure of the other party to
perform required or necessary actions, delays in performance by the other party, or any law, proclamation,
regulation or ordinance, demand or requirement of any government or governmental agency having or
claiming to have jurisdiction over the work, the materials purchased for the work, or the Parties hereto, or
any other cause, whether similar or dissimilar to those enumerated above, beyond the reasonable control of
the Party affected. Accordingly, Buyer shall not have any claim against Cofimco in respect of
nonperformance, erroneous performance or delay in performance. In the event Cofimco is delayed by
reason of any of the foregoing, the time for performance and delivery shall be extended by a period of time
equal to the period of delay, and the Contract price shall be increased to compensate the affected party for
the increased cost of performance hereunder.
VII. TAXES
The prices for equipment are exclusive of any present or future state, municipal or other sales or use tax or
any other present or future excise tax upon, measured by the gross receipts for any transaction hereunder or
any allocated portion thereof, or by the gross value of the equipment, or of any present or future property tax
or similar charge with respect to the equipment. If Cofimco is required by applicable law or regulation to
pay or collect any such tax or taxes on account of the equipment, then such amount of tax and any penalties
and interest thereon shall be reimbursed to Cofimco by Buyer.
VIII. TEST OF EQUIPMENT
Any performance test of equipment shall be made in accordance with procedures to be agreed upon in
writing between Cofimco and Buyer. Cofimco shall be notified of and may witness any such test. All such
tests shall be conducted within the warranty period. Buyer shall obtain Cofimco’s written permission prior to
any disclosure to a third party concerning the nature or results of such tests.
IX. CANCELLATION
Buyer may cancel orders entered on Cofimco’s books only after Cofimco consents thereto and Buyer agrees
to pay Cofimco for all costs incurred by Cofimco, all costs to cancel orders by Cofimco for performance,
and a reasonable amount for Cofimco’s profit.
~ 7
COFIMCO axial fans for the world COFIMCO M-MR Series
X. LIMITATION OF LIABILITY
Notwithstanding any other provision to the contrary of these T&Cs, the Contract or at law, neither Cofimco
nor its subcontractors shall be held liable to Buyer or any third party for, without limitation, loss of
anticipated profits, loss of business reputation or opportunity, loss by reason of plant or other facility
shutdown (therein including missing or reduced production), nonoperation or increased expense of operation,
service interruptions, cost of purchased or replacement power, claims of customers, loss of use of capital or
revenue, cost of money, or for any special, indirect, incidental and/or consequential loss or damage of any
nature whatsoever arising at any time from any cause whatsoever in connection with the Contract.
Accordingly, regardless of whether Cofimco has been advised of the possibility of such damages, under no
circumstance shall Cofimco be liable for any losses, liabilities, claims, damages and/or expenses howsoever
arising as a result of any action or omission by Cofimco under or in connection with the Contract whether
under contract, tort (including gross negligence), strict liability or otherwise, except exclusively in the event
they are the direct and immediate consequence of willful misconduct or gross negligence by Cofimco
resulting in the material breach of essential duties under these T&Cs finally established by a court or arbitral
panel of competent jurisdiction after due process of law.
In all cases, any liability of Cofimco arising out of or in connection with these T&Cs or the Contract shall
not extend to any damages payable by Buyer to any third parties and shall be limited to such losses,
liabilities, claims, damages and/or expenses which had been foreseeable at the time of the execution of the
Contract, taking into account the circumstances of which Cofimco was aware at such time; moreover, in no
event shall the total liability of Cofimco arising out of the supply of equipment or services hereunder –
whether under contract, tort, strict liability or otherwise and regardless of the form of action – exceed the
price of the purchase order under which the services or equipment giving rise to liability are provided.
Cofimco’s liability under these T&Cs and within the limits set forth herein, shall be exclusive and in lieu of
any provisions, conditions and warranties implied by law, equitable principles or rules and/or custom of trade
(including implied warranties of fitness for purpose and merchantability). Accordingly, to the maximum
extent permitted and regardless of whether Cofimco has been advised of the possibility of any such loss or
damage, Buyer waives any remedies and reliefs provided by the applicable law arising out of, or in
connection with, any possible loss of (anticipated) profits and/or any other loss or damage other than as
expressly specified under this Article X.
XI. REFUNDS, KICKBACKS, ILLEGAL PAYMENTS
Buyer is prohibited from paying any company funds to any director, officer, employee, or other agent of
Cofimco or from otherwise making any payments from the funds that would be illegal under any applicable
laws.
XII. GOVERNING LAW
These T&Cs, the Contract and all contractual and non-contractual disputes arising out of, or in connection
therewith and with the supply of the equipment or services by Cofimco to Buyer, shall be governed by, and
shall be construed solely in accordance with, the substantive laws of the Republic of Italy.
~ 8
COFIMCO axial fans for the world COFIMCO M-MR Series
XIII. JURISDICTION
Unless otherwise stated in Cofimco’s order acknowledgment, each Party agrees for the benefit of the other
Party that the court of Milan, Italy, shall have exclusive jurisdiction to hear and determine any suit, action or
proceedings, and to settle any disputes, which may arise out of or in connection with these T&Cs, the
Contract or the supply of the equipment or services by Cofimco to Buyer and for such purposes, irrevocably
submits to the exclusive jurisdiction of such court.
XIV. ENTIRE AGREEMENT CLAUSE
Together with Cofimco’s order acknowledgement, these T&Cs, irrespective of whether they are or will be
attached or referred to by other Contract documents, constitute the only general terms and conditions of sale
by Cofimco, and purchase by Buyer, of the equipment to be delivered or services to be rendered hereunder.
Accordingly, except as provided for under Article XV below, these T&Cs shall supersede all
communications, negotiations, arrangements and agreements, whether oral or written, between the Parties
with respect to the subject matter of the Contract and, particularly, shall override any terms and conditions
stated in any order or acknowledgement or any other document or communication issued, supplied or sent by
Buyer.
Cofimco shall not be bound by any terms and conditions stated in Buyer’s purchase orders,
acknowledgements forms or in any other document(s) or correspondence which vary, limit or add to these
T&Cs, which shall prevail notwithstanding the diverging, conflicting or additional terms and conditions that
may appear on any of the aforementioned documents unless not expressly incorporated herein. Moreover, it
is expressly agreed that if Buyer issues a purchase order or other documents for the supply of the equipment
or the services provided under these T&Cs, such document will be deemed to be for Buyer’s internal use
only, and these T&Cs shall supersede any provision therein. Notice of objection is hereby given to any
additional or different terms and conditions and Buyer accepts it.
Finally and in any event, subject to Article XV below acceptance by Buyer of the equipment or the services
under the Contract will amount to and be deemed to all effects as an unconditional and final acceptance and
approval by Buyer of these T&Cs.
XV. AMENDMENTS TO THE T&Cs
Any amendment or addition to these T&Cs may only be made in writing and shall bear the signatures of the
duly authorized representatives of each Party.
SPECIFIC APPROVAL
For purposes of Articles 1341 and 1342 of the Italian Civil Code, Articles V, VI, X, XII, XIII, XIV of the
General Terms and Conditions of Sale are hereby expressly and specifically agreed upon and approved by
the Buyer.
~ 9
COFIMCO axial fans for the world COFIMCO M-MR Series
Table of Contents
Warranty ………………………………………………………………………………………… 12
0 Foreword ………….………………………………………………………………….……..…. 13
1 General Information ……………………………………………………..…………………… 15
1.1 M-MR Series COFIMCO fan description ..…………………………………………… 15
1.2 Fan serial number description ..………………………………………………………. 16
1.3 Balancing ..…………………….……………………………………………………… 17
1.4 Delivery and storage …………………………………………………………………. 17
2 Set-up………………………………………………………………………………………….. 19
2.1 Handling procedure ……………………………………………………….…………. 19
2.2 Lift procedure ………………………………………………………………………… 20
2.3 Installation required tools ……………………………………….……………………. 21
2.4 Inclination of the blade axis ………………………………………………………………. 22
2.5 Fan rotation and flow direction …………………………..…………………………… 23
2.6 COFIMCO rotor and M-MR series hub installation procedures ……………………. 24
2.6.1 Hub installation on shaft …………………………………………………… 24
2.6.2 Blade installation and pitch angle setting ………………………………….. 28
3 Start-up instructions ………………………………………….……………………………… 32
3.1 Operations implemented before start-up ………………………………………………… 32
3.2 Operations implemented after start-up ………………………………………………….. 33
3.3 Profile exterior appearance ………………………….…………………………..……. 35
4 Maintenance preventive actions …………………………………………………………….. 38
4.1 Maintenance and operation ……………………………………………………………. 38
4.2 Temperature limits …………………………………………………………………… 40
4.3 Possible vibration causes …………………………………………………………….. 40
Hub removal ……………………………………………………………………………………. 42
Trouble Shooting ……………….………………………………………………………………. 44
Component list …………………………………………………………………………………… 46
Contact ………………………………………………………………………………………….. 48
~ 10
COFIMCO axial fans for the world COFIMCO M-MR Series
Figure list
Figure 1.1: fan installation type ……….……….……………………..………..………………… 15
Figure 1.2: identification label format …………………..………………………..………………. 16
Figure 1.3: label sample …………………………………….…………….……………………… 16
Figure 2.1: blade lift ..…………………………..……………………………………………….. 20
Figure 2.2: torque wrench ……..………………………………………………………………… 21
Figure 2.3: digital protractor …………………………………………………………………….. 21
Figure 2.4: blade axis layout …………………………………………………………………….. 22
Figure 2.5: lade clockwise rotation ……………………………………………………………….. 23
Figure 2.6: cylindrical bore hub installation …………………………..…………………………. 24
Figure 2.7: guided hub installation ………………………………………………………………. 26
Figure 2.8: blade installation ……………………………………………………………………… 28
Figure 2.9: blade turn coordinator positioning ……………………………………………………… 29
Figure 2.10: digital protractor correct positioning …………….……………..…………………… 30
Figure 2.11: bolt tightening order ……………………………………………………………………. 30
Figure 3.1: vibration control positioning diagrams ……………………………………………… 34
Figure 3.2: resin rich area ……………………………………………………………………….. 35
Figure 3.3: resin rich area (real section) ………………………………………………………….. 35
Figure 3.4: resin rich ……………………………………..………….…………………………… 36
Figure 3.5: aluminum superficial scratches .………………………………………………………. 36
Figure 3.6: aluminum superficial stains …….……………………………………………….…….. 37
Figure A.1: hub removal ……………………………………………….…………..…….……… 42
Figure C.1 assembly part detail …………………………………..……………………..……….. 47
~ 11
COFIMCO axial fans for the world COFIMCO M-MR Series
Table list
Table 2.1: guided bolt tightening torque …….……………………………………………………… 27
Table 2.2: guided bolt tightening torque ……..…………………………………………..………… 31
Table 4.1: limit temperatures ……………………………………….…………………………….. 40
Table C.1: parts list …………………………………………………………………..…………… 46
~ 12
COFIMCO axial fans for the world COFIMCO M-MR Series
Warranty
COFIMCO S.r.l. ensures that labour and all materials used in fan construction are of high-quality.
However, in case of mechanical failure of our fans within the first year of operation or 18 months
from factory shipment date, if our inspectors have noticed breakages due to material or
workmanship defects, the fan will be repaired or replaced with an identical or equivalent fan ,
according to our exclusive and unquestionable verdict, at our expense. Possible repairs or
replacements will be conducted at our establishment and do not include transport and workmanship
costs.
Any warranty given by COFIMCO S.r.l. ceases, if the fan has been tampered with or if breakage is
caused by incorrect manoeuvres or installation. Expenses for repairs conducted without COFIMCO
S.r.l. approval will not be recognized.
In no case COFIMCO S.r.l. may be held responsible for consequential or incidental damage of any
type, resulting from construction, sale, installation or use of its product.
~ 13
COFIMCO axial fans for the world COFIMCO M-MR Series
Chapter 0
Foreword
The present “Fan Installation, Maintenance and Operation Manual” has the purpose of providing all
the necessary information for:
• the correct installation of the fan
• its correct use in safe conditions
• performing maintenance in a correct and safe way
• dismantling the fan in safe conditions and in respect of the regulations in force safeguarding
the health of operators and the environment.
WARNING: the people responsible for the device are obliged, under the regulations in force,
to carefully read the content of this “Fan Installation, Maintenance and Operation Manual”
and of making the people in charge of the installation and maintenance read it in the parts
that concern them.
The time employed for this purpose will be widely compensated by the correct functioning of
the device and by its use in safe conditions.
This document presupposes that the safety and hygiene regulations in force are fully respected in
any plant or space where the fans are installed.
~ 14
COFIMCO axial fans for the world COFIMCO M-MR Series
The instructions, drawings, and documentation contained in the present “Fan Installation,
Maintenance and Operation Manual” are of a confidential technical nature and are exclusively
owned by the manufacturer. They may therefore not be reproduced in any way, neither entirely or in
part.
This “Fan Installation, Maintenance and Operation Manual” needs to be carefully preserved and
must accompany the fan in all the changes of ownership that the device might go through in its life
cycle.
None of its parts should be removed, torn or arbitrarily modified.
NOTE: COFIMCO holds itself responsible for the descriptions written in Italian. Any translation
can never be fully checked and therefore, if any incongruence should arise, only the Italian version
will be valid. In case you should detect any imprecision, please contact our Sales office, which will
proceed to making any modifications considered appropriate.
Waste disposal and disassembly
Lubricants and spare parts need to be disposed of in respect of the regulations in force in the
country where the machine is being employed.
In case of disassembly of the machine, please refer to the disassembly indications for the single
components.
Any constructive elements that have been replaced following reparations or any parts of the
machine or even the entire machine at the end of the period of use need to be disposed of according
to the local provisions in force at that time.
~ 15
COFIMCO axial fans for the world COFIMCO M-MR Series
Chapter 1
General information
1.1 M-MR Series COFIMCO fan description
COFIMCO M-MR fans Series is a truly ingenious design. Fans are offered with blade pitch angle
adjustable at standstill.
The hub is composed of two parts, an upper and lower drop forged halves. The upper portion
supports blade pitch adjustment and bolt tightening. In addition to bolt tightening, the lower portion
connects the fan directly to the output shaft or with the use of a bushing.
Fan blades are available in either an aerodynamic aluminium or fibreglass profile. Blades are
assembled in the hub with the use of a steel shaft.
Figure 1.1: fan installation type
M-MR Series COFIMCO fans are available in two different configurations (see figure 1.1 only as
an example)
• M type: fans supported by the drive shaft
• MR type: fans suspended from the drive shaft
M Type MR Type
AIR-FLOW DIRECTION
AIR-FLOW DIRECTION
~ 16
COFIMCO axial fans for the world COFIMCO M-MR Series
1.2 Fan serial number description
All COFIMCO fans have a label positioned on the hub making them easy to identify.
Label structure is described in figure 1.2; a label example is given in figure 1.3.
F/T Fan type: fan type is given by a label containing the following:
XXXXX XX XXY XXY
Hub dimensions
Hub type
Section material:
N: Aluminum
L: Flap aluminum
F: Fibre-glass
Profile type
Fan blade number
Fan diameter in mm
Sometimes, after the acronym referring to the hub, the letters R and/or T can be reported,
representing the reverse direction mode of installation. It also means that the blades are
respectively equipped with a special tip plug.
C/R COFIMCO manufacture order reference number.
P.O. Client acquisition number
I Manufacturing order item number
A° Blade pitch angle
Figure 1.2: identification label format
Figure 1.3: 4267/05/24L/22MRT label example
~ 17
COFIMCO axial fans for the world COFIMCO M-MR Series
The example label (fig. 1.3) refers to a 4267 mm diameter fan, equipped with 5 blades, each having
a 24L profile (aluminum), blades with special tip caps, 220 mm M hub and reverse configuration.
Job reference number 12345/678, Purchase Order of Customer PO123456, number of item in the
job E1234, 10.5° blade pitch angle.
ATTENTION: the label shown here is only an example and does not correspond in any way to
label data identifying any purchased fan.
ATTENTION: data presented by the identification label must always be forwarded to COFIMCO
when spare parts are requested.
1.3 Balancing
Unless otherwise requested, all COFIMCO fans are balanced as shown below:
• Dynamic balancing of the hub and static balancing of blades, to be assembled at quality
grade G6.3 according to ISO 1940/1, when the fan is shipped disassembled. In this case the
blades have the same moment balanced and, therefore, can be positioned in the hub in any
order. The blades of the same item can be interchanged.
• Fan dynamic balancing, with quality grade G6.3 in accordance with ISO 1940/1, in this case
the fan will be shipped already assembled.
1.4 Delivery and storage
As soon as the COFIMCO fan is delivered, it is important that a thorough inspection is conducted in
order to identify possible damage caused during transport. In this case, submit a complaint to the
transport company and mark the related bill of lading. Immediately after fan delivery, check the
perfect correspondence between ordered components and delivered components. In case goods do
not comply with order, contact COFIMCO within two weeks from delivery.
Removed fan from its packaging only for installation. If the fan is not installed immediately, storage
requirements will be as following:
~ 18
COFIMCO axial fans for the world COFIMCO M-MR Series
Short storage period
For a short storage period fan package may be stored in an open area characterized as:
• Covered.
• With good drainage.
• Sufficient placement area bearing capacity.
• Suitable for forklift, truck, crane use.
• Vegetation free.
• Protected from flooding.
• With adequate access roust.
Long storage period
In case of a long storage period, fan package will be preferably stored in an indoor area
characterized as following:
• Covered.
• Enclosed on all sides.
• Asphalt or concrete pavement with adequate bearing capacity.
• Suitable for forklift and truck use.
• Parasite free (mice, insects, etc.).
• Protected from flooding.
• With adequate access roust.
~ 19
COFIMCO axial fans for the world COFIMCO M-MR Series
Chapter 2
Set-up
This manual refers to M-MR Series COMFIMCO fan set-up. Set-up conditions may not always be
the same.
2.1 Handling procedure
The following rules should be followed during fan and painted component handling, assembly and
maintenance:
• Avoid hub stacking one above other; if necessary, place a separating element (wood, rubber,
plastic, etc.) between discs.
• Direct contact between fan and any metallic instrument is strictly forbidden: chains, hooks,
etc.
• Store hubs on a non-abrading surface.
• Avoid hub movement or shifting during transport.
• Avoid hub exposure to temperatures above 80 °C (176 °F).
• In order to avoid paint damaging do not heat painted surfaces using flames.
• Avoid striking the casing with any object.
• Loosen all bolts mounting the blade to the hub in order to facilitate blade shaft insertion
avoiding surface scratching. This should also be performed in case a blade pitch angle
adjustment is necessary. The same procedure should also be performed on adjoining blade
bolts in order to facilitate the operation.
• In case a painted surface is damaged, carry out paint repair procedures as soon as possible
(see contract applicable touch up procedure) in order to avoid production decline with
possible rust appearance and premature deterioration of unprotected parts. In case above
mentioned procedure is necessary but is not carried out, the warranty is declared void.
• Possible damage due to transport must be immediately reported to COFIMCO in order to
assess whether such damage may or may not affect blade structural safety or aerodynamic
performance.
~ 20
COFIMCO axial fans for the world COFIMCO M-MR Series
2.2 Lift procedure
The following rules must be respected during lift:
• Once removed from its package, fan movement must be minimal in order to avoid fan and,
especially, paint damage.
• Direct contact between fan and any metallic instrument is strictly forbidden: chains, hooks,
etc.
• Fully assembled fan must be elevated using at least three lifting points placed at equal
distances between them.
• Lifting devices must be adapted to fan being lifted weight and dimensions.
• General and system’s lifting regulations must always be respected.
• Blades must always be lifted in an horizontal profile position as shown in figure 2.1.
Figure 2.1: blade lift
~ 21
COFIMCO axial fans for the world COFIMCO M-MR Series
2.3 Installation required tools
Fan set-up requires the following tools:
• Torque wrench (figure 2.2) used for bolt tightening.
• Digital protractor (figure 2.3) used to give the blade profile pitch needed to achieve desired
performance according to procedures described in this chapter. Digital protractor precision
must be at least ±0.5°(maximum admissible deviation) to the design pitch angle.
Figure 2.2: torque wrench
Figure 2.3: digital protractor
If requested, COFIMCO is able to provide assembly necessary tools.
~ 22
COFIMCO axial fans for the world COFIMCO M-MR Series
2.4 Inclination of the blade axis
With respect to the rotation plane, blade axis presents a small angle/slope aimed towards the airflow
(see figure 2.4). When in operation, the centrifugal force generates a bending torque opposite the
force generated by the aerodynamic force, considerably reducing blade stress. Therefore, when
mentioned slope is present, it is necessary to make sure the blade axis will rotate towards the air
flow direction during installation.
Figure 2.4: blade axis layout
ATTENTION: in case the precone angle is installed incorrectly, or rather the blades are tilted
towards air flow direction, loads stressing the blades considerably increase and may exceed
design limits.
For this reason, in case the same cone is incorrectly set-up, the warranty is considered void.
Air-flow
Rotation axis
Rotation plane
Blade inclination
Aerodynamic force
Centrifugal force
torque
Aerodynamic
force torque
Centrifugal force
~ 23
COFIMCO axial fans for the world COFIMCO M-MR Series
2.5 Fan rotation and flow direction
Fan rotation direction is correct when air flow moves from the part with greater curvature (back) to
the lower curvature (belly). In the example of figure 2.5 it has a clockwise rotation, seen from the
side receiving the flow; upon request, COFIMCO provides fans with counter-clockwise rotation.
Figure 2.5 blade clockwise rotation
ATTENTION: excessive obstacle closeness may generate a significant aerodynamic load
disturbance for any blade, resulting in turbulence, whirlpools, major tiring loads and
vibrations, depending on obstacle dimensions and distance.
Flow direction
Rotation axis
Clockwise
Blade axis
~ 24
COFIMCO axial fans for the world COFIMCO M-MR Series
2.6 COFIMCO rotor and M-MR series hub installation procedures
ATTENTION: after making sure that electrical contacts have been removed and that the
engine may not in any way be started inadvertently, it is allowed to proceed with assembly as
follows:
NOTE: Elements present in the part list (see attachment C) are recalled in the text by corresponding
number insertion between square brackets.
2.6.1 Output shaft hub installation
COFIMCO provides two hub types:
1) Cylindrical bore hub: attached directly to the drive shaft, for the procedure see figure 2.6.
(a) Positioning unit tightening (b) Washer tightening
Figure 2.6: Cylindrical bore hub installation
~ 25
COFIMCO axial fans for the world COFIMCO M-MR Series
Coat the shaft with a thin layer of grease. If provided, install the spacer ring [10] by
inserting it in the shaft supporting the fan until it comes into contact with its edge.
Push the hub [1] onto the shaft until it comes into contact with its edge, with the shaft, or
with the spacer ring if any.
The shaft on which the rotor is installed, when the hub/spacer will come into contact with it,
must remain inside the hub bore at least 2mm (a 5 mm distance is recommended) to prevent
vertical displacement of the fan when fan fastening plate [16] is tightened.
Put the positioning unit [14] (which in some cases can be replaced by a flat washer [13], see
documentation parts list) on top of the hub and tighten bolt [16] on the shaft, as shown in
figure 2.6.
NOTE: bolt [16] is not supplied by COFIMCO.
ATTENTION: in case of positioning unit use, bolt [16] must be tighten so the positioning
unit will be free to rotate but not to raise; this action is carried out in order to allow
alignment between positioning unit holes and blade shaft.
ATTENTION: do not start the fan with central bolt incorrectly tightened.
~ 26
COFIMCO axial fans for the world COFIMCO M-MR Series
2) Bushing hub: in order to anchor refer to figure 2.7.
ATTENTION: the fan shaft must never be lubricated.
Figure 2.7: bushing hub installation
Insert bushing [11] on the drive shaft to desired anchor position. Bushing should be
completely engaged with the output shaft.
Install the hub [1] onto the bushing so as the bolt’s holes match up.
Once component positioning has been verified, tighten bushing bolts using tightening
torques defined in table 2.1 paying attention to bushing type.
ATTENTION: in the event of positioning unit use for blade installation, shaft outer
extremity must remain inserted in hub orifice at least 2 mm (a distance of 5 mm is
recommended).
~ 27
COFIMCO axial fans for the world COFIMCO M-MR Series
Bushing Type
Tightening Torque
N m Lb ft
P1 and P2
Q1 and Q2
R1 and R2
S1 and S2
21
39
39
95
16
29
29
70
Table 2.1: bushing bolt tightening torque [12]
NOTE: bushing are subject to external agents that can generate a superficial oxide layer on
them. This does not provoke any variations in their mechanical traits and should be
considered normal.
ATTENTION: do not start the fan with bushing bolts incorrectly tightened.
~ 28
COFIMCO axial fans for the world COFIMCO M-MR Series
2.6.2 Blade installation and pitch angle setting
For the installation of the blades please follow the instructions described below and referring to
figure 2.8.
NOTE: for some fan models (see part list included in the provided documentation) instead of
positioning unit [14], washer [13] is provided.
ATTENTION: if fan is dynamically balanced at the factory and shipped disassembled, please make
sure the blade to hub markings match.
Figure 2.8: blade installation
~ 29
COFIMCO axial fans for the world COFIMCO M-MR Series
1. Thoroughly clean slots [A] and [B] of the semi-hub[1], designed to lock blades to the shaft,
by removing any trace of grease.
2. Support blade haft [ 3], after having previously cleaned it, on lower hub [1] with the [A-A]
groove in its slot [A] and insert bolt [15] into the blade shaft hole by passing it through the
positioning unit’s side hole[14]. At this point the blade does not require additional support;
repeat previous operation for all blades and tighten bolt [16] using an appropriate torque.
In case washer [13] is provided instead of positioning unit [14], position all blades on
inferior hub [1] with [A-A] extremity in its slot [A]. At this point, sustaining all blades at the
same time, proceed to next step.
ATTENTION: during blade installation, keep the blades elevated when tightening bolts (so
blade position is not affected by its own weight).
3. Support the upper hub part [2], taking into account that it must be placed on the lower part
so the two serial numbers engraved on each part coincide (in case the hub is painted, the
serial number is replaced by identification dots).
ATTENTION: for seal disk models [9], before hub locking, position the seal disk on
the upper hub so the two component holes coincide.
4. Insert screws [5] and tighten nuts [8] remembering to insert the flat washers [6] and flexible
washers [7] correctly, as shown in figure 2.8. The bolts must be tightened but still permit
blade rotation for the subsequent pitch adjustment and movement along its axis.
5. Pull blades outwards so that shaft shank of each blade [A-A] abuts to the hub inner side. In
case of positioning unit mounted blades [14], before pulling outwards, unbolt all bolts [15]
at least 10 mm.
6. Use the digital protractor (figure 2.3) to set pitch angle.
Place the digital protractor on the upper blade side 5 mm away from the tip cap
perpendicular to blade axis as shown in figure 2.9.
Figure 2.9: blade turn coordinator
5 mm
~ 30
COFIMCO axial fans for the world COFIMCO M-MR Series
In case the profile is very wide and the instrument length is insufficient, rest a rigid bar of
adequate length onto the blade so both profile points (leading edge and trailing edge) are
reached and rest the digital protractor on top. See figure 2.10 for correct measuring position.
Figure 2.10: digital protractor correct positioning
Rotate the blades around their own axis until the pitch angle is reached (A°), angle described
by the identification label. Maximum allowed tolerance is ±0.5°.
Repeat above described operations for each blade. Before initiating new blade pitch angle
adjustment, rotate the fan until the new blade reaches previous blade coupling adjustment
position. By doing so, possible small variations due to eventual rotation axis verticality
imperfections are compensated.
7. Tighten the bolts [6] (gradually using the torque/dynamometric wrench), following the
cross-order shown in figure 2.11, maintaining the upper part of the hub parallel to the
bottom, thus avoiding to have an unbalance between the two sides of the hub.
Bolt tightening torques depend on utility class: use torque values from table 2.2
ATTENTION: during blade installation, keep the blades elevated when tightening bolts (so
blade position is not affected by its own weight).
ATTENTION: the stainless steel bolts (class A2/A4) must be tightened without using
automatic/high speed screwdrivers in order to avoid galling.
NOTE: hub type is indicated on the identification label while bolt class is identified by bolt
head.
Figure 2.11: Bolt tightening order [5]
Correct positioning Correct positioning Incorrect positioning
~ 31
COFIMCO axial fans for the world COFIMCO M-MR Series
Bolt Type
Tightening Torque
Class 8.8 – dry A2/A4-70 – lubricated A2/A4-80 – lubricated
N m Lb ft N m Lb ft N m Lb ft
M12
M14
M16
M18
M20
101
160
242
335
472
75
118
178
247
348
54
85
128
177
250
40
63
94
131
184
70
110
167
230
325
52
81
123
170
240
Table 2.2: guided bolt tightening torque [5]
ATTENTION: stainless steel bolts (A2/A4-70 and A2/A4-80) use of the lubricant.
ATTENTION: in case of a multiple fan system, before proceeding with pitch angle
adjustment, angle described by the identification label placed on all blades, adjust the angle
for one fan and follow chapter 3 instructions.
~ 32
COFIMCO axial fans for the world COFIMCO M-MR Series
Chapter 3
3 Start-up instructions
3.1 Operations implemented before start-up
1. Before operation a fan make sure that all components are well fixed and that there is no
wobble between blade shaft and hub, otherwise check bolt tightening torque as described in
chapter 2.
2. Turn the fan manually for at least one turn to make sure that the fan does not interfere with
the surrounding structure.
3. Turn the fan to check that the gap between blade tip and ferrule is included in design ratio
x/D, where x is the distance between blade tip and ferrule and D is fan diameter. The
distance between blade tip and ferrule must be measured along blade axis.
If the distance is different from the design distance check if blade shank is next to the hub.
In case blade shank is not positioned next to the hub, unbolt the bolts [5], pull the blades
outwards and tighten once again the bolts using table 2.2 torques.
4. Check if blade axis respect angle pitch defined by the datasheet (see paragraph 2.4).
5. In case a painted surface is damaged (during transport, set-up, pitch angle adjustment, bolt
constant tightening or other reasons), carry out paint repair operations as soon as possible
(see touch up procedure applicable to the contract) In case above mentioned procedure is
necessary but is not carried out, the warranty is declared void.
6. Possible damage due to set-up must be immediately reported to COFIMCO in order to
assess whether such damage may or may not affect blade structural safety or aerodynamic
performance.
7. Remove all equipment from fan surrounding area.
8. Power on the fan for a few seconds and then shut it off. During the shut off phase check if
blade rotation is correct as described in paragraph 2.5.
~ 33
COFIMCO axial fans for the world COFIMCO M-MR Series
3.2 Operations implemented after start-up
1. Check motor HP consumption. If excessive, gradually reduce blade pitch angle until desired
HP consumption is reached. If motor HP consumption is lower than provided, increase blade
pitch angle until desired HP consumption is reached. Adjust the pitch angle on all system
fans.
NOTE: a few angle degree deviation from design angle is considered normal.
ATTENTION: power absorption is inversely proportional to ambient air temperature.
2. Check that fan vibration level, measured according to fan shaft bearing assembly, in
positions indicated by figure 3.1, do not exceed amplitudes of 7mm/s RMS (overall).
ATTENTION: for vibrations contained in 7-12 mm/s RMS (overall) range, the fan may
remain operational for the time necessary for problem solving.
ATTENTION: this vibration limit is valid for translational vibrations, or rather constant
direction vibrations along the fan-motor-transmission reference axis (invalid in case of
rotational vibrations, in case these vibrations are excessive, contact COFIMCO).
ATTENTION: for whole structure admissible vibration level refer to structure developer.
Refer to international standards such as ISO-10816-1 directive.
3. After 50-75 hours of rotor operation, check bolt torque values on the blades [5].
~ 34
COFIMCO axial fans for the world COFIMCO M-MR Series
Figure 3.1: vibration control positioning schematics
PAC
CT
ACC
~ 35
COFIMCO axial fans for the world COFIMCO M-MR Series
3.3 Profile exterior appearance
ATTENTION: the fibreglass reinforced profiles (FRP) used in COFIMCO blades are obtained
through pultrusion procedures.
Because of the intrinsic process nature, during production small formations of reinforcement layer
may form (figure 3.2 ) filled with resin ( resin rich area ). The same resin, once hardened, becomes
fragile causing superficial irregularities (mostly on the leading edge) as shown in figures 3.3 and 3.4
even on blades that have never been operational. Above mentioned irregularities are not considered
defects and, heaving only an aesthetic value, do not compromise in any way blade structural
characteristics. In fact, these irregularities are analysed in the supply chapter and are subjected to
acceptance standards defined during design phases.
The “resin rich” may be observed rather a long time after production (for example after transport)
and in some cases after a few operation hours.
Figure 3.2: resin rich area
Figure 3.3: resin rich area (real section)
Normal
Resin rich
Resin rich area = only aesthetic, non
structural
Blade surfaces:
textile and resin
Longitudinal fibres (glass) and resin
~ 36
COFIMCO axial fans for the world COFIMCO M-MR Series
Figure 3.4: resin rich
NOTE: The reinforced fibreglass (FRP) is sensitive to UV rays, causing a profile progressive
discolouration with the passing of time (until it stabilizes), it does not induce blade mechanical
property variation and is considered normal.
WARNING: the aluminum profiles may become scratched (figure 3.7) or stained (figure 3.8) on
the surface. This does not in any way compromise the integrity and structural characteristics of the
blade. Such scratches or stains are only aesthetical and are not covered by the warranty.
Figure 3.5: aluminum superficial scratches
~ 37
COFIMCO axial fans for the world COFIMCO M-MR Series
Figure 3.6: superficial stains on aluminum
~ 38
COFIMCO axial fans for the world COFIMCO M-MR Series
Chapter 4
Maintenance Preventive Measures
4.1 Maintenance and operation
A. Check periodically fan general condition. The inspection interval depends on the fan’s
operation conditions. In normal conditions, the inspection is recommender to be conducted
once every 6 months. During these inspections check:
• bolt tightness;
• possible corrosion;
• blade coupling and profile general status;
If necessary, clean blades to avoid dirt accumulation that could induce improper operation.
ATTENTION: when cleaning the blades do not use high pressure air jets in order to avoid
painted and/or fibreglass part damage.
NOTE: due to blade FPR component manufacturing process, surface imperfections may be
contained in the same components but they do not influence the blade’s structural integrity.
Any blade is individually controlled during assembly, transport and packaging, thus
presenting a conformity warranty once the product is released.
B. Ice formation on moving fan elements must absolutely be avoided.
Ice presence on non operating fan blades must be removed before rotor start-up, avoiding
blade damage.
Snow accumulation on a non operating fan must periodically be removed depending on
snow accumulation abundance.
In order to avoid constant blade snow cleaning, when fan operation is stopped for long
periods of time in particularly snowing areas, blade rotation until they reach a vertical
position is recommended.
ATTENTION: before moving the blades in a vertical position check if obstacles block the
blade’s path.
C. In case of a two speed motor system, before switching to the low speed, stop the motor for
the time required for the fan to reach a speed lower than the operating speed, then power on
the fan.
D. In case a fan is provided with two way operation, power down the fan before changing
rotation direction.
~ 39
COFIMCO axial fans for the world COFIMCO M-MR Series
E. Inspect periodically the painted parts in order to promptly stop the beginning of any
corrosion. Particularly, in cooling towers, the blades leading edge is subjected to intense
wear when stainless steel is not applied; it is advised to check protection every six months.
Damaged protections must immediately be reconditioned, mainly those on the leading edge
of the blades.
ATTENTION: painted parts and protective treatments are subject to wear, independent of
fan operation. Inspections and possible reconditioning are, therefore, appropriate when
necessary. In case a painted surface is damaged, carry out paint repair procedures as soon as
possible (see contract applicable touch up procedure) in order to avoid production decline
with possible rust appearance and premature deterioration of unprotected parts. Periodic
inspection absence renders the paint warranty void.
F. In case of lack of fan operation for long time periods, start-up the equipment (once every
three months) for a few minutes in order to drain possible water / condensate accumulated
inside of the blades that could produce excessive corrosion of any particular components.
G. Check that fan vibration level, measured according to fan shaft bearing assembly, in
positions indicated by figure 3.1, do not exceed amplitudes of 7mm/s RMS (overall). In case
the limit is surpassed, shut down the fan and search for the excessive vibration cause
referring to paragraph 4.3 (possible cause of vibration).
NOTE: the vibration level is a good indicator for the system’s condition, thus carrying out
frequent inspections is considered appropriate. If the fan is provided with tools for rapid and
automatic vibration detection, it’s recommended to carry out such inspections once a month,
otherwise it is advisable to conduct a vibration check every time the fan periodic inspection
is carried out.
Reading recording is recommended to be carried out each time so comparison with previous
readings is made possible (is always performed in the same locations, which can be
identified through paint signs or other). During vibration measurements, conduct the usual
safety measures and in particular do not approach a running fan, but place the transducer
(accelerometer) near the non-operational fan and perform measurements at a distance.
~ 40
COFIMCO axial fans for the world COFIMCO M-MR Series
4.2 Temperature Limits
M Series COFIMCO fans are designed to operate with the following temperatures:
Minimum
– 20 °C (-4 °F) with standard materials
– 40 °C (-40 °F) with special materials
Maximum
For aluminum blades:
+ 120 °C (+ 248 °F) operational fan
+ 165 °C (+ 329 °F) non operational fan
For fibreglass blades (FRP):
+ 80 °C (+ 176 °F) operational fan
+ 120 °C (+ 248 °F) non operational fan – for short periods
Table 4.1: limit temperatures
4.3 Possible vibration causes
The cause of fan vibrations may vary. Below are listed the most common:
A. Imbalance of one or more blades: this causes vibrations in the rotor plane of rotation, with a
frequency equal to the number of fan revolutions and with linear amplitude dependent on the
amount of imbalance and the square of the speed of rotation.
B. Blade pitch angle is not between ±0.5° tolerance: this causes vibrations outside the plane of
rotation at a frequency equal to the number of fan revolutions, and amplitude depending on
the square value of the speed of rotation.
C. Blade position to obstacles (periodicals aerodynamic disturbances): this causes vibrations
outside the plane of rotation, with a frequency equal to the product between the number of
blades and the number of laps, the amplitude depends on aerodynamic noise extent.
D. Resonance between one possible forces acting upon the fan is one (or more) way that the fan
supporting structure vibrates.
Main vibration generating forces usually have the following frequencies:
• fan rpm;
• product between fan rpm and fan blade number;
• product between fan rpm and number of structural supports able to generate
aerodynamic interference (if placed symmetrical to the axis), the value of this force
is inversely proportional to obstacle distance to the blades.
~ 41
COFIMCO axial fans for the world COFIMCO M-MR Series
E. Vibrations transmitted from the structure that the fan is installed on: the frequency of such
vibrations depends on the frequency of external forces and on structure resonance
frequencies.
F. Blade resonance with one possible forcing: in the vast majority of cases, the vibration is
manifested outside of the plane of rotation.
G. Drive shaft misalignment: in the vast majority of cases, the vibration is manifested outside
of the plane of rotation.
H. Blade and/or speed reducer mounting bolt loosening: fan behaviour in these conditions is
unpredictable because it depends on loosening extent and location.
I. Slow shaft bearing wear: it produces vibrations within the plane of rotation with a frequency
equal to the number of fan turns.
J. The fan or support structure’s nuts and bolts are loosened: in this case it’s necessary to
tighten bolts.
K. Blade drain slots are clogged: in this case unclogging is necessary to remove obstructions
from drain slots.
L. Incorrect assembly of the hub: the hub must be installed correctly, as shown in the
installation manual.
M. Incorrect assembly of the blades in the hub: the blades must be installed correctly, as shown
in the installation manual.
ATTENTION: fan vibration amplitude depends on fan support stiffness. Not critical vibrations for
a fan supported by a sufficiently rigid structure, are amplified and can become dangerous for the
integrity of the rotor, if the fan support is too flexible. In addition, support flexibility causes a blade
resonance frequency variation.
~ 42
COFIMCO axial fans for the world COFIMCO M-MR Series
Appendix A
Hub removal
ATTENTION: Before removing the hub must make sure that the motor’s power supply is
disconnected and also make sure that the motor will not become operational inadvertently.
Hub removal may be carried out with the blades still attached or with detached blades.
ATTENTION: during removal, the fan must be secure in order to avoid a falling.
Hub removal may be carried out in a simple manner by using a hub puller M, described in figure A.
1, not supplied with the fan.
For removal follow the following procedure referring to figures A. 1.
Figure A.1: Hub removal
Z
~ 43
COFIMCO axial fans for the world COFIMCO M-MR Series
1. Unbolt bolts [5] (see part list, attachment C), by removing the blades if the hub is provided
with washer [13].
2. If the positioned [14] has been used, remove bolts [15], remove blades, remove anchoring
bolt [16] and remove the positioned.
3. Insert a circular plate [X], see Figure A. 1, to prevent crankshaft head damage. Plate
dimensions depend on the hole (must have a diameter slightly smaller than the hole and a
thickness of at least 5 mm).
4. Anchor the extractor within the two free holes of the disc by inserting bolts [5].
5. Insert the bolt [W] through the threaded hole [Z] until it touches the circular plate; remove
the entire hub by tightening the bolt [W] until the hub is fully raised from the shaft.
6. Once the extraction is complete remove the extractor and tighten once again the hub bolts
[5] using the correct tightening torque.
~ 44
COFIMCO axial fans for the world COFIMCO M-MR Series
Appendix B
Troubleshooting
TROUBLESHOOTING
Problem Possible cause Possible Solution
Low volumetric flow rate
Low power consumption
System jam. Clean the whole system.
Air flow blocked by obstacles.
Check the obstacle’s total effective
area and fan inlet shape with regard
to the original.
Dry-cooler’s required minimum
free inlet area height must be equal
to at least one fan diameter ; this
height must be larger than in the
case of multiple units in a row.
Static pressure higher than
specified.
Increase blade pitch (up to 3
degrees after having consulted the
datasheet).
Blade pitch angle decreased due
to blade rotation (for example if
the bolt tightening torque has not
been respected)
Correct blade angle and refer to the
instruction manual for correct bolt
tightening torque.
Temperature higher than design
temperature.
Increase blade pitch (up to 3
degrees after having consulted the
datasheet).
High power absorption
Temperature inferior to design
temperature.
Lower blade pitch angle. (up to 3
degrees after having consulted the
datasheet).
Static pressure lower than design
pressure.
Lower blade pitch angle. (up to 3
degrees after having consulted the
datasheet).
~ 45
COFIMCO axial fans for the world COFIMCO M-MR Series
Problem Possible cause Possible Solution
The fan tip rubs against the
fan ring
Fan and/or support structure nuts
and bolts is loose.
Tighten all bolts.
Rotor is not centred.
Tip clearance to small.
Centre the rotor.
Increase fan casing diameter.
Scratches or small damage … Contact COFIMCO
Fine cracks on blade
surface
… Contact COFIMCO
High vibration level
One or more blades are
unbalanced.
Contact COFIMCO
Blade average pitch angle not
included in ± 0.5 °tolerance.
Adjust blade angle.
Excessive blade closeness to
obstacles (periodical
aerodynamic disturbances).
Contact COFIMCO
Resonance between one possible
forces acting upon the fan is one
(or more) way that the fan
supporting structure vibrates.
Contact COFIMCO
Vibrations transmitted from the
fan support structure.
Contact COFIMCO
Resonance of the blades with one
possible climatic forcing.
Contact COFIMCO
Drive shaft misalignment. Realign the shaft.
Output shaft bearing wear. Contact supplier.
Fan and/or support structure nuts
and bolts is loose.
Tighten bolts with the correct
tightening torque.
Blade drain slots are clogged.
Remove obstructions from drain
slots.
For any problem, please contact COFIMCO specifying purchase order number indicated on the tag
attached on the hub.
~ 46
COFIMCO axial fans for the world COFIMCO M-MR Series
Appendix C
Component list
ATTENTION: the part list refers to a standard M-MR series fan, for special applications refer to
the documentation supplied with the fan.
P ART LIST
I TEM D ESCRIPTION I TEM D ESCRIPTION
1 BOTTOM HUB 10 S PACER ( IF PROVIDED )
2 TOP HUB 11 B USHING ( IF PROVIDED )
3 B LADE SHAFT 12 B USHING BOLTS
5 B OLTS 13 W ASHER ( IF PROVIDED )
6 W ASHER 14 P OSITIONING UNIT
7 E LASTIC WASHER 15 B OLTS
8 N UT 16 B OLTS ( NOT SUPPLIED BY COFIMCO)
9 S EAL DISK ( IF PROVIDED )
M-MR SERIES FAN COMPONENTS
Table C.1: part list (see figure C.1)
~ 47
COFIMCO axial fans for the world COFIMCO M-MR Series
Figure C.1 assembly part detail
~ 48
COFIMCO axial fans for the world COFIMCO M-MR Series
Contact
COFIMCO S.r.l.
Via A. Gramsci, 62
28050 Pombia (NO) ITALY
Tel. +39 0321/968311 – FAX. +39 0321/958992
Hudson Products Corporation
9660 Grunwald Road Beasley, TX 77417 USA
Phone: +1 281 396 8285 – Fax: +1 281 396 8388
Cofimco Fan (Changshu) Co., Ltd.
Jinjiang Industrial Park Huangpujiang Road
Changshu Southeast Economic
Development Zone Changshu P.R.CHINA
Phone +86-512 5235 8930 – Fax +86-512 5235 8929
Cofimco International Trading Co.,Ltd.
Room 1803, No.3 Building
Kai Xuan Hua Yuan, 111 Zhong Cao Road
Shanghai 200030 P.R.CHINA
Phone +86-2164-686460 – Fax +86-2164-686460
Cofimco Industrial Fans India Pvt. Ltd.
Survey Nos. 15/2A & 15/2B
Mel Ayanambakkam Main Road
Rajiv Nagar, Chennai – 600 095 Tamil Nadu, INDIA
Phone +91- 4465510390
info@cofimco.com
http://www.cofimco.com