Muto Denki KFL Series User manual

Rev.1
Nov. 2023
Muto Turbo Blower
KFLSeries
Instruction Manual
Muto Denki Corporation
Headquarters: 751,Nishi Hassaku-cho,Midori-ku,Yokohama,Kanagawa,Japan226-0024
TEL:[phone], FAX:[phone]
OsakaBranch: 4-14, Toyosaki3,Kita-ku,OsakaCity,Osaka ,Japan531-0072
TEL:[phone], FAX:[phone]
ChinoPlant: 11400-1107,Aza Harayama,Tamagawa,Chino City,Nagano,Japan 391-0011
TEL:[phone], FAX:[phone]
web: http://www.mutodenki.co.jp e-mail: [e-mail]
Read thismanual carefully beforeusing theproduct.
Wrongoperations deviating fromthis manualmay lead to serious accidentsor damages.
Keep thismanual convenient location foreasyaccess.
TMB-061E

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Table of contents
1. Introduction·········································································· 3
2. Safety precautions·································································3
3. Receiving Checkups ····························································· 5
4. Transportation and Handling···················································· 5
5. Storage··············································································· 5
6. Installation············································································ 5
7. Piping·················································································· 6
8. Connection to Power and Test run ············································ 6
9. Precautions for Operation ······················································· 7
10.Maintenance ········································································ 8
11.Troubleshooting ···································································· 9
12.Structural drawing·································································· 10
13.Motor·················································································· 11
14.Inquiry················································································· 11
15.Limited Warranty··································································· 11

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1. Introduction
Thankyouforpurchasingthe MutoTurboBlowerKFLSeries.
Thismanual contains theinformation you need forhandling,installing,operating and maintainingyour
new equipment correctly, to ensure trouble-free operation and long service life. Please read it
thoroughly. Afterreadingthismanual,keepitinconvenientplaceforeasyaccess.
2. Safety precautions
Before starting any work such as handling, installing, operating and maintaining, carefully read this
manual and all documents attached to the product for proper use. Use the product after thorough
understanding of allproductinformation,safetyinformationand precautions.
Inthismanual,safetyprecautionsare classifiedas “Warning”and“Caution”.
Thistagindicates thatwrongoperationorusemayleadto fatallossorserious
injury.
This tag indicates that wrong operation or use may lead to human injury or
lossofproperty.
Eventheitemsunder maylead toseriousresultsdependingonthe circumstances.
Those precautions include very important information and it is strongly recommended to follow them
strictly.
(Placetoinstall ）
⚫The product with non-explosion proof type motor shall not be installed in explosive or
inflammableatmospheres.Otherwiseinjuries, explosions or firesmay occur.
(Gas)
⚫Unless otherwise agreed separately, the product can handle only normal air. It is cannot be
handled any other gas (explosive, toxic, corrosive, high temperature and so on), liquid or solid
materials. Otherwiseinjuries,explosions or firesmayoccur.
(Wiring)
⚫Refer to the instruction manual of motor. Otherwise fires, electrical shocks or explosions may
occur.
⚫Do not touch the wiring. Shut off the power before checking the wiring. Otherwise electrical
shocksmayoccur.
(Operation )
⚫Do notgetclose to orlook into theopen inlet or outlet manifold during the product is running as it
isverydangerous as follows.
Inlet ; Clothing which you are wearing or a part of your body will be sucked in. As a result,
injuriesmay occur.
Outlet:Astrongwindorflown thingsmaycauseinjuries.

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⚫Do not insert finger(s) or hand(s) into the rotation check hole cover etc. Donot removethesafety
cover duringthe productis running.Otherwiseinjuriesmayoccur.
⚫Shutoffthe mainpowerswitch incaseofpowerfailure.Otherwiseinjuriesmayoccur.
(DisassemblyandReassembly)
⚫Beforedisassemblyandreassembly,makesureto shutoff themainpower andpreventpowerto
be turned on. Otherwiseinjuriesorelectrical shocksmayoccur.
( Others )
⚫Follow the labelsattached to theproduct. Otherwiseserious resultsmayoccur.
(Transportation )
⚫Check the mass of the product with the specifications, drawing or catalogue before
transportation, and be careful not to drop ortip over the product during transportation. Otherwise
injuriesorbreakagesmay occur.
(Installation )
⚫Removealloftheinflammable from theproductand its vicinity. Otherwise firesmay occur.
⚫Ventilate the room to keep the ambient temperature below 40 deg. C. Otherwise burns, fires or
bearing-damagemay occur.
(Operation )
⚫If any abnormalities are found, stop the machine immediately. Otherwise injuries, electrical
shocksorburns may occur.
⚫Operatethe blowerin correctdirection forrotation. Otherwisebreakagesmay occur.
(DisassemblyandReassembly)
⚫Disassembly and reassembly should be done by experts. Otherwise injuries or breakages may
occur.
⚫Do not use the parts of this product on other equipment. Do not use unauthorized parts for the
product.Otherwise injuriesor breakages mayoccur.

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3. Receiving Checkups
Check if the products you have received are what have been ordered by referring to the order sheet,
drawings,invoices, etc.
(1) Check the nameplates on the blower and the motor, and confirm if it matches what have been
ordered.
(2) Count the numberoftheproduct,andconfirmifitagreeswithwhat havebeenordered.
(3) Confirmthatthereisno breakageduring transportation.
4. Transportation and Handling
When transporting the blower, lift it by hooking rope or wire to the hook. When notusing thehook, be
sure to lift the bottom part, and transport it with care not to overturn. Be careful not to give shocks to
anyparts ofthe blower.
5. Storage
Ifthebloweris storedbeforeinstallation,becareful asfollows:
(1) Store the blower in a room where ventilated, not humid nor dusty. Otherwise the blower may
haveany troubles.
(2) Beforeoperating theblower whichhadbeenstoredforlongperiodoftime,checkif thebearing
andtheinsulationof the motorhavenoproblem.
(3) While the blower is stored, rotate the blower shaft several times by hand every month. If this
procedureisnotperformed,the lifeof thebearing may become short.
(4) After stored for long period of time, carefully check if the blower has no abnormality before
operating.
6. Installation
The blower should be placed on a flat and rigid foundation with vibration isolator pads. If there are
gapsbetweenthe pad andfoundation,fillthe gapswiththinsteelsheets(shimming).
Clearsomespacearoundthe blowerforthemaintenance.Donotcovertheair filterwhichisboth side
of theblower.
Whenanchorboltsareused,donotfasten nutstightlyso thatthe padswillbeeffective. (Fig.1)
(Anchorboltisoption.)
Fig.1 Anchorbolt

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7. Piping
Use the sleeve joint to connect the outlet of the blower with a pipe to avoid unnecessary force to the
blower andto isolate thevibration from the blower. If direct connection to the pipe is inevitable, do not
give the force to the blower by dimensional tolerances, weight of piping, thermal expansion of piping,
etc. When piping to connect, keep 25mm between the outlet and the pipe so that the joint will be
effective.
8. Connection to Power and Test run
(1) Removethecover ⑤(SeePage10.)thatcoversmotor.
(2) Turnthe motorshaftbyhandtoverifyfree rotation withoutrubbing ornoise.
(3) Check the nameplates of blower and motor and confirm if they agree with the specification for
powersupply, then connect to powerline under instructionby electrical engineeras perelectric
technical standardsandwiring regulation.(Fig.2orFig.3)
Direct-on-linestarting
Fig.2 Terminalblock (for3.7kWorsmaller)
Star-deltastarting Direct-on-linestarting
Fig.3 Terminal block (for5.5kW orlarger)
(4) Attach thecover ⑤asbefore.
(5) Jog the blower and confirm the rotational direction is the same as the mark. The rotational
direction isconfirmedaspeepingthrough the holeafterremoved the rotationcheckholecover.
(After confirming, re-attach the cover.) If the rotational direction is opposite, change the wiring
connection. Thedirection can be reversed by exchanging 2 wires of 3 wires. If the blower runs
continuously with reverse rotational direction, it cannot perform as specified and may lead to
seriousaccident.
(6) Shutthedamper.
(7) Run the blower and open the damper as air volume becomes the required amount. Measure
the electric current (average of each of 3 phases) of the motor. If it exceeds the rated current,

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use at below the rated current by adjusting the air volume with damper and so on. After
running for a while, if there is no abnormal vibration or noise, test run can be concluded. If any
abnormality were found during test run, corrective action should be taken by referring to “11.
Troubleshooting”.
9. Precautions for Operation
Beforeoperatingtheblower,understandthe following thoroughly,
(1) Air volume is adjusted by the damper. After adjusting the volume with the handle, its position
canbefixedby thewing screw.(Fig.4)
Fig.4 Damper
(2) KFL Series has the minimum volume. Do not run the blower below the minimum volume.
Because the motor may break down so that it is not cool enough. Each of the minimum
volumesis shownon Table1.
Table1 Minimumvolume
Model
volume
[ m3/min]
Model
volume
[ m3/min]
KFL-3
1.3
KFL-5P
2.0
KFL-5
2.0
KFL-7P
2.7
KFL-7
2.7
KFL-10P
3.2
KFL-10
3.2
KFL-15P
4.5
KFL-15
4.5
KFL-20P
7.0
KFL-20
7.0
KFL-25P
9.0
Note:thistableis forstandardmodels.
(3) Continuoususe at smallairvolumewillleadto blower durabilityproblem.
(4) The blower is designed to handle clean air. It cannot handle for air containing particulates and
dust, corrosive gases nor inflammable gases. Temperatures of air which standard model can
handlearein therangeof-15to40deg.C.
(5) To start the blower as shut the damper is recommended. But open the damper immediately
aftertheblower run.

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10. Maintenance
Thefollowing maintenanceisrecommended tokeepthebloweringoodcondition.
(1) Payattentionto ventilation to keep theambient temperaturein therangeof-15to40 deg.C.
(2) Pay attention to abnormal noise, abnormal vibration, abnormal temperature and air leakage. If
abnormalityisfound,takeactions referringto “11.Troubleshooting”.
(3) Theonlybearingsinthe blowerare in themotor,whicharelubrication-freetype.
(4) Check the cleanliness of the filter periodically. Replace or clean the filter if and when the air
filterisnotclean,asitcausespressureloss. (Fig.5)
(a) Removal
Pullthe filteroutofthe filter case.
(b) Setting
Pushthe filter intothefiltercase.
Note:The filtershouldnot havewrinkleandgap.
(c) Cleaning
The filter can be washed by soaking into water or
neutral detergents. (Wash it gently, do not rub or
do not squeeze it.) Lay the cleaner side up to dry.
It can be cleaned for several times with this
method.
Fig.5 Airfilter

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11. Troubleshooting
Thefollowing tableisfortroubleshooting duringtestrunandoperation.
Trouble
Cause
Whattodo
Blownfuseor
Trippedcircuit
breaker
Abnormal voltageorfrequency
Consultwithpowercompany.
Inappropriatecapacityofpower
sourceequipment
Replacewith appropriateone.
Missingphase
Checkwiring.
Imbalancedvoltageofphase
Consultwithpowercompany.
Excessivevoltagedrop
Checkthethicknessandlengthof
wiring.
Excessive current
Reduceairvolumebydamper.
Reversedrotation
Changewiring.( exchanging2wiresof
3wires)
Fantouch
Repair.
Waterin thecasing
Drainandtake somepreventive
measure.
Abnormalityofbearing
Repair.
Insufficientair
pressureor
volume
Improperfrequency
ConsultwithMuto.
Toohigh ambientairtemp.
Improveairventilation of theroom.
Leakage orcloggedpiping
Checkpiping.
Missingphase
Checkwiring.
Damaged fan,etc.
Repair.
Reversedrotation
Changewiring.(exchanging2wiresof
3wires)
Dirty orcloggingairfilter
Cleanorreplace.
Lowered motor speed
ConsultwithMuto.
Foreign materialonthe fan
Clean up.
Abnormal noise
and/orvibration
Touchingorbrokenfan
Repair.
Reversedrotation
Changewiring.(exchanging2wiresof
3wires)
Imbalanceof fan
Fancleaning.If vibrationstillremains,
repairit.
Bad bearing
Repair.
Foreign objector water
Clean upandprotect.
Imbalancedvoltagebetween phase
Consultwithpowercompany.
Missingphase
Checkwiring.
Airleakage
Checkpipingand repair.
Weightofpiping or forceinducedby
thermalexpansion
Getridofanyforce to theblower.

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12. Structural drawing
No.
Description
Qty.
1
Casing
1
2
Fan
1
3
End head
1
4
Motor
1
5
Cover
1
6
Rotationcheckhole cover
1
7
Airfilter
2(twosheetsoffiltereach)
8
Pullbox
1
9
Terminalblock
1
10
Damper
1
11
Sleevejoint
1
12
Rubbervibrationisolator
4