HUNTAIR FANWALL Technology Retrofit Operating and safety instructions

9
OPERATION AND MAINTENANCE DATA
PROJECT: BDMC Women’s & Infant Services
1B Antepartum Unit
LOCATION: Mesa, AZ
CONTRACTOR: Comfort Systems USA SW
SUBMITTED BY: Climatec, Inc.
2851 W. Kathleen Rd.
Phoenix, AZ. 85053
602-944-3330
MANUFACTURER: Huntair
PRODUCT: Fanwall Technology Retrofit
Air Handling Unit
FWT
TAGS: AHU – 1
DATE: 8/25/11

INSTALLATION/MAINTENANCE
GUIDE
FANWALL Technology®Retrofit
Improper installation, adjustment, alteration service or maintenance
can cause property damage, injury or death. Read the installation,
operating and maintenance instructions thoroughly before installing
or servicing this equipment.
FOR YOUR SAFETY

TABLE OF CONTENTS
GENERALDESCRIPTION............................................................................................................ 1
INSTALLATIONCODES/PRECAUTIONS ................................................................................. 1
INSTALLATION
SHIPLOOSEITEMS/INSTALLATIONTOOLREQUIREMENT ..................................... 2
FANWALLASSEMBLY
ELECTRICALCONNECTIONS......................................................................................... 3
DEMOLITION .................................................................................................... 4
FANWALLASSEMBLYANDINSTALLATION ................................................................ 5,6
WIRING ............................................................................................................................ 7
CAULKING ....................................................................................................................... 8
FAN/CONEALIGNMENT............................................................................................... 9,10,11
OPTIONAL
VFDPOLY TUBINGINSTALLATION.............................................................................. 12
MAINTENANCE ............................................................................................................................ 13,14
START-UP .................................................................................................................................... 15
TROUBLESHOOTING .................................................................................................................. 16
START-UPINSPECTIONREPORT............................................................................................. 17
WARRANTY .................................................................................................................................. 18
PAGE
© Copyright 2011, HUNTAIR, Inc.
ALL RIGHT RESERVED. NO PART OF THIS BOOK MAY BE REPRODUCED,
STORED IN A RETRIEVAL SYSTEM, OR TRANSMITTED IN ANY FORM BY AN
ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING MEANS OR
OTHERWISE WITHOUT THE WRITTEN PERMISSION OF HUNTAIR, INC.
COPYRIGHT 2011.
Themanufacturer reservestheright tomodify thematerials and specificationsresulting froma continuingprogramof
productimprovement orthe availabilityof newmaterials.

GENERAL DESCRIPTION
1
INSTALLATION CODES
Electricalcharacteristicsareshownontheunitratingplate.
The unit shall be carefully installed in accordance with the
standards of the National Fire Protection Association (Na-
tionalElectrical Code).
Authorities having jurisdiction should be consulted
beforeinstallations are made to verifylocalcodes and
installationprocedures.
INSTALLATION PRECAUTIONS
1. The services of qualified field service personnel are
mandatoryforsafeandproperinstallationofthisequip-
ment.
2. Air volumes and external static pressures that do not
coincide with those listed on the rating plate will ad-
versely affect the performance of the unit. Please
consult the factory if either of these values change.
3. Thefollowingclearancesfromcombustiblematerialsare
to be maintained: Top - 6", control side - 48", opposite
controls - 6", bottom - 0". If roof curb is provided by
others, it must be at least 4" high and constructed from
non-combustiblematerial.
4. This unit is designed for installation on a level surface.
5. Do not locate the supply inlet opening within 10' of any
exhaustdischargepointorwithin24"ofanyobstruction.
INSTALLATION CODES / PRECAUTIONS
Follow all safety codes. Wear safety glasses and work
gloves.
WARNING
Before installing or servicing system, always turn off
main power to system. There may be more than one
disconnect switch. Turn off accessory heater power if
applicable. Electrical shock can cause personal injury
or death.
CAUTION: Beforeproceeding,makesureallelectrical
service to unit is locked in “Off” position.
GENERALDESCRIPTION
HuntairFanwallTechnology®isafan-arrayapproachtoair
handlerdesignthatthatusesseveralsmallerfanstoreplace
onelargerfan,providingdesignflexibility,reducingmainte-
nance costs, and increasing energy savings.
Safety Considerations
Installing and servicing air conditioning equipment can be
hazardous due to system pressure and electrical compo-
nents. Onlytrainedandqualifiedservicepersonnelshould
install or service air conditioning equipment.
Untrainedpersonnelcanperformbasicmaintenance,such
as cleaning and replacing filters. All other operations
should be performed by trained service personnel. When
working on air conditioning equipment, observe precau-
tions in literature and on tags and labels attached to unit.

22
Common Ship Loose Item
5/16-18WHIZBolts —
5/16-18FlangeNuts—
1/4-20 x 3/4 Self Tapping Tek Screws —
#10-32 x 3/8 Type F Pan Phillips Self Tapping Screws —
#12-24x 1-1/2UnslottedHWTselfTapping TekScrew—
In-lineOrificeRestrictor—
1/4 Inch Flat Washer —
3M540PolyurethaneCaulking—
Or Sikaflex 1a Caulking —
Touchuppaint—
Optional Red and Blue Poly Tubing for VFD Controls —
FANWALLInstallationTools
1/2 inch End Wrenches
1/2 or 3/8 inch Socket set
ImpactDriver
NutDriverBit Set
Note:
Verifiy ship loose pieces with the ship loose packing slip to ensure that all ship loose items are
present and accounted for. Some items on the packing list may not be depicted on this page.

ElectricalConnections
Allelectricalwiringandconnectionsincludingelectricalgrounding
mustbemadeinaccordancewiththelatesteditionoftheNational
ElectricCode(ortheeditionyourauthorityhavingjurisdictionhas
adopted). There may also be local ordinances that apply.
a. TheFWTnameplateandthedrawingsinthesubmittalpackage
statethelinevoltageandminimumamperagerequirementsfor
this unit. A separate line voltage power supply should be run
directly from the building distribution panel to the electrical
panelprovidedonthesideoftheFWTunit. Thequantityofwires
and the connection terminals are identified on the wiring
diagramin the submittalpackage. Allexternal wiring mustbe
within approved conduit and have a minimum temperature
ratingof90°C.
b. IMPORTANT: Ifanyoftheoriginalwiresuppliedwiththeunit
must be replaced, it must be replaced with type THHN 90°C
wireoritsequivalent,exceptformiscellaneous120voltcontrol
wiring that must be type SJO 90°C.
c. Refer to the submittal package for other control interface
connections.
INSTALLATION
3
General Maintenance
HUNTAIR’sFANWALLTECHNOLOGY®payscarefulattention
given to balance in the design and construction of the units.
Each unit uses standardized precision parts, and is individually
spin-balancedat the factory to eliminate vibration. Forthis
reason,whenever maintenance workisdoneonthemotor or if
thefan is removedfrom themotor shaft, rebalancingthe fan is
required.

4
FANWALL ASSEMBLY
FANWALLAssembly
DANGER! Risk of Electric Shock
Alwaysdisconnectpowerto the fan control panel
before maintenance. Follow all lockout and tag
out procedures.
Verifyfactoryfurnishedcomponentsarecompleteagainst
enclosed packing list. Each FANWALL retrofit cube is
numberedandmustbelocatedinthearrayperthesubmittal
drawing. Cellnumberingalwaysbeginsintheupperlefttop
cell,runsleft to right,then begins at theleft end oftherow
beneath that. Fan cells are banded to a skid and shrink
wrappedforshipment. Cellsusedontheperimeterofafan
array have insulation retaining panels, interior cells have
just insulation.
CELLIDENTIFICATION
Priorto demolition of existing fan:
Verify that FANWALL cube dimensions are correct and
assembled array will fit inside existing air handling unit.
InternaldimensionsofairhandlerwereprovidedtoHUNTAIR
by others.
1. Disconnect power to the existing fan at the main
disconnectcontrol panel.
2. Make note of all wire locations for reinstallation later.
3. Disconnectexistingfanmotorpowercablefromtermi-
nallocatedinmotorJ-BoxandconduitfittingfromJ-Box
asshown in thedemolition drawings.
4. Remove existing fan/motor assembly and clean the
areathoroughly.
FANARRAYNUMBERINGSAMPLE
Individualcomponentssuch as theelectricalchase and
motor removal rail, etc. are shipped on a separate skid.
REMOVEEXHISTINGFAN
EXHAUSTINGFAN
REMOVED
LOCATE & MARK
FANCELLS WITHFANCELLS WITH
FANCELLS WITHFANCELLS WITH
FANCELLS WITH
INSULATIONRETAININGINSULATIONRETAINING
INSULATIONRETAININGINSULATIONRETAINING
INSULATIONRETAINING
PANELSONSHIPPINGSKIDPANELSONSHIPPINGSKID
PANELSONSHIPPINGSKIDPANELSONSHIPPINGSKID
PANELSONSHIPPINGSKID

FANWALL ASSEMBLY
5
FANWALLAssembly
5. Makesure that floor on airhandler is level and rigid.
6. Determinetheoffset for theassembled array (from in-
sidepanels) on both sides ofunit so that the fan array
is centered in the air tunnel and mark accordingly.
7. Align the first fan cell frame needed at the bottom row,
furthest from the access door. Make sure to maintain
the correct distance from the unit side panel. Hoist the
next fan cell on top of the first fan cell and secure with
5/16-18WHIZboltsand5/16-18 flangenuts.
8. Repeat this process until the proper number of fan
cellper column has been obtained and thenumber of
columns has been reached. SEE FIGURE 1.
9. Onceyouhavereachedthecorrectnumberofcolumns,
slide the second column into place next to the first
column as tight as possible. Make sure that the cell
side insulation sheets have been installed in both the
firstand second fan columns. Bolt together using the
5/16-18WHIZ bolts and 5/16-18 flange nuts.
10. Repeat process until all fan columns are in place.
SEE FIGURE 2.
FIGURE1
FIGURE2
Insulation

5
6
11. Fill the void space with the specidied insulation be-
tween the top of the assembled FANWALLarray and
the unit roof.
12.Securetheside and topblank-offs to thecellframes on
boththeinletanddischargesideoftheFANWALLusing
the5/16-18 WHIZ bolts and 5/16-18 flange nuts. The
blank-offs have one flange with a matching hole pat-
tern with the fan cells.
13. Secure the blank-offs to the roof and side panels using
the1/4-20 x3/4"selftappingtekscrews on10inchcen-
ters.
14. Once all the insulation and blank-offs have been in-
stalled. Secure the FANWALL to the base by using
the #12-24 x 1-1/2" unslotted HWT self tapping tek
screws and 1/4 inch flat washer.
FANWALLAssembly
FANWALL ASSEMBLY
Insulation
Blank-offs

FANWALL ASSEMBLY
7
FANWALLElectricalInstallation
DANGER! Risk of Electric Shock
Alwaysdisconnectpowerto the fan control panel
before maintenance. Follow all lockout and tag
out procedures.
1. Verify fanwall assembly install is complete.
2. Install electrical chase on the discharge side
usingdrivescrews. Seeseprateinstallationdesign
drawings.
3. AttachFMC (flexible metalconduit) from motor j-box
(Pecker head) to electrical chase using FMC con-
nectors.
4. Sizewire (per NECcode) andpull from motor(s) to
enclosure/j-box.
5. Wireinternalmotorconnection.
A. Crimponringterminals.
B. Boltterminalstogetherforwhatevervoltageyouare
using(seemotornameplate).
C. First layer wrap with Friction tape (3M Varnished
Cambric).
D. Secondlayerwithrubbersplicingtape (3M 130C).
E. Thirdlayerusevinyltape(3MSuper33).
Note: 3 wraps on all taped layers.
6. Hi-potwires.
7. Connect wires to Enclosure / j-box.
ELECTRICALCHASE
MOTOR J-BOX
FLEXIBLEMETAL
CONDUIT (FMC)
FMCCONNECTOR
8. Install electrical chase cover with #10-32 x 3/8 type
Fselftappingscrewsprovided.
9. Re-assemble air handling unit walls, doors, safety
devices etc. that removed during retrofit per
manufacturer'srecommendations.
10. Prior to connection to main power check fan wheel/
cone alignment per instructions starting on page 8.
11. Perform VFD startup as specified by VFD manufac-
turer.
12. Verifythatthefansarerotatinginthecorrectdirection
asindicatedbythefanrotationstickerandoperatingat
requiredCFM at design static pressure.
Note: If fans are rotating in the opposite direction of
the fan rotation sticker. DO NOT correct rotation
by switching Line or Load wiring of the drive
units. Change rotation by switching wires on the
Load side of the MSP.
ELECTRICALCHASECOVER
FMC TO ELECTRICAL
ENCLOSURE
FMC MOTOR J-BOX
TOELECTRICAL CHASE
Flexible Metal Conduit
to motor J-Box
Ring Terminals
All electrical work must be preformed by a
licenced electrician. All grounds are pulled
continuously thru fanwall chase without splic-
ing to accommodate for box fill calculations.
ELECTRICAL NOTE

1. After wiring is completed. Caulk all inlet flanges, bolt
heads and nuts.
2. Caulkthe seams between the roof and the blank-offs.
Caulktheseamsbetweenthe sidepanelsandtheblank-
offs
3. Caulkall flanges bolting theblank-offtogetherandcaulk
all flanges bolting the blank-offs the the FANWALLar-
ray.
4. Caulk seam between the floor and the bottom of the
FANWALLarray.
FANCELLDISCHARGESIDE
BLANKOFFTOROOF
BLANKOFFTO
SIDE WALL
CAULKBLANKOFF
PANELS
FANWALLAssembly
8
FANWALL ASSEMBLY
Caulk all inlet flanges,
bolt heads and nuts
Caulkalonghere

9
FANWALL Option -
Fan / Cone Alignment
1. Temporarily attach the cone to the cell inlet using the
screws and washers provided, or slightly loosen the
screws holding the cone if already installed. Use a
minimum of four screws for this step.
a. Refertothefanwheeloverlapdrawingsprovidedto
determinewheretosetthewheelwithrespecttothe
cone.
b. Adjust the amount of overlap by moving the motor
pedestalforwardorbackwardtolineuptheconewith
thewheel(wheel/coneoverlapisdesignedtoinsert
thecone50%ofthedistanceoftherolledshroudlip
on the wheel). Once you have the wheel approxi-
matelylocatedtightenthe½”pedestalboltsto90ft-
lbs.
2. Centerthe cone inthe wheel shroud.
a. The cone alignment can be a tedious process as
there are no tools that effectively work to align the
cone. It is a hands on process to align the cone.
Huntair cones have a running clearance of about
1/16"(seefigure1).
b. Startbylooseningthefourscrewsthatwereusedto
holdtheconeforthedepthalignment. Holdthecone
withonehandandwiththeotheruseadrilltoattach
ascrewtoholdtheconeinplace. Feelbetweenthe
wheelinlet shroud andthe cone andset the gapto
approximately 1/16" and tighten the screw in that
location(topoftheconeisusuallythebestplaceto
start). Atthispointyoushould be able to movethe
coneabout that screwlocation, adjust thecone on
the left or right until there is approximately a 1/16"
gap.
c. Spinthewheelbyhandatthispointtocheckforany
clearance issues. If the wheel spins clear tighten
the remaining screws on the cone. Check that the
wheelspins clearafter tightening each screw.
3. Attach the inlet airflow straightener using the formed
anglebrackets(seefigure2).
a.Start by loosely installing (don’t tighten screws all
the way) the bottom angle bracket. Set the
airflow grid on the angle bracket. Align the side of
the grid with the end of the bracket.
b.Installeither vertical angle bracket loosely and
check fit up.
c.Install the two remaining brackets and tighten (see
figure2).
FIGURE1
TYPICALFAN~CONE
CLEARANCE
FIGURE2
AIRSTRAIGHTENER
AIRSTRAIGHTENER
ANGLEBRACKETS
FANWALL ASSEMBLY

10
WHEEL/CONE ALIGNMENT SIZE 16 WHEEL
WHEEL/CONE ALIGNMENT SIZE 18 WHEEL
Note: Drawings not to scale
FANWALL ASSEMBLY

WHEEL/CONE ALIGNMENT SIZE 20 WHEEL
WHEEL/CONE ALIGNMENT SIZE 22 WHEEL
Note: Drawings not to scale 11
FANWALL ASSEMBLY

Air Monitoring Option
If the retrofit comes with the VFD (variable frequency
drive)option follow the following step for installation of
the red and blue poly tube.
1. Starting at the cones. Connect the red poly tubing to
the barbed nipple on the inlet side of the cone. Con-
nect the blue poly tubing to the barbed nipple on the
discharge side of the cone. (SEE FIGURE 1)
2. Making sure not to kink the tubing. On the upper fan
cubes route the tubing along the base. (SEE FIGURE
2)
3. Route tubing along the top of the electrical chase way
toward the control panel securing tubing as it is being
routed.
4Making sure not to kink the tubing. On the lower fan
cubesroute thetubing along the top. (SEE FIGURE 3)
5. Route tubing along the bottom of the electrical chase
way toward the control panel securing tubing as it is
beingrouted. Installthepressurein-lineorificerestrictors
on both the high and low pressure tubing no less than
4ft from pressure transducers. Restrictors can be in-
stalled in either direction.
6. Route tubing to the control panel. Attach tubing to the
transmitters. See figure 4 for transmitter location and
see electrical schematics for which transmitter is des-
ignatedto whichfan.
FIGURE 1
InletSide
DischargeSide FIGURE 4
High Low
ELECTRICALCHASECOVER
FMC TO ELECTRICAL
ENCLOSURE
FMC MOTOR J-BOX
TOELECTRICAL CHASE
FIGURE 3
FIGURE 2
12
OPTIONAL
HIGHPRESSURE
LOW PRESSURE

MAINTENENCE
Fanwall Option -
Fan Wheel/Motor Replacement
1. Toreplaceafan wheel/motor assembly, first discon-
nect power to the FWT at the main control panel.
2. Set the motor pedestal rail onto the structural angle
bracketsthatrunfronttobackalongthecell(seefigure
1).
3. Linethefourpedestalboltholesupwith the bolt holes
onthe angle bracket.
a. Insert ½” bolts into the holes, make sure to use a
standard washer on the bolt side and a standard
washer and lock washer on the nut side. Hand
tighten the bolts for now (see Figure 1).
4. Set the motor on the pedestal (see Figure 1). Use
properlifting techniques, craneor motor/rail system if
possible for lifting the motor into position. Once the
motoris placedonthepedestalalign theboltholeson
themotortotheboltholesonthepedestalmakingsure
that the motor shaft is pointing towards the fan inlet
wall.
a. Next, insert 3/8" bolts into the holes from the
underside,makesuretouseastandardwasheron
theboltside,onlyalocknutisrequiredonthemotor
side(see Figure 1).
b. Squarethemotorandtightenthebolts.Withvibra-
tion isolators tighten bolts to 20 ft-lbs. Without
vibration isolators tighten bolts to 40 ft-lbs.
5. Locate the fan wheel and cone and associated hard-
ware and move to the inlet side of the fan wall (see
Figure2).
a. Installtrantorquebushingintohubonfanwheel.
Make sure that the nut pattern on the bushing is
facingtowardsthefanwheelblades.
b. Place the fan wheel onto the motor shaft through
the trantorque bushing. Slide the wheel onto the
shaft until the trantorque is fully engaged on the
motor shaft. Be careful not to push the fan
wheeltoofar onto theshaft as interferencewith
the pedestal may occur. Hand tighten the
bushingfornow(seeFigure2).

FAN
CONTROL
PANEL
3/8"MOTORBOLTS
½”PEDESTAL
BOLTS
MOTORPEDESTAL
MOTORSTRUCTURE
ANGLEBRACKETS FIGURE1
AIRFLOWSTRAIGHTNERGRID
TRANTORQUE
BUSHING CONE
FASTENER
INLETCONE
FORMEDANGLE
BRACKET FIGURE2
13

DANGER!RiskofInjury
Rotatingequipment. Alwaysdisconnectpowerto
thefanmotorbeforemaintenance.

DANGER! RiskofElectricalShock
Always disconnect power to the fan control panel
beforemaintenance. Followalllockoutandtagout
procedures.

MAINTENENCE
Fanwall Option -
Fan Wheel/Motor Replacement (CONTINUED)
6. Temporarily attach the cone to the cell inlet using the
screws and washers provided (see figure 2). Use a
minimum of four screws for this step.
a. Refertothefanwheeloverlapdrawingsprovidedto
determinewheretosetthewheelwithrespecttothe
cone (see pages 10 & 11).
b. Adjust the amount of overlap by moving the motor
pedestal forward or backward to line up the cone
with the wheel (wheel/cone overlap is designed to
insert the cone 50% of the distance of the rolled
shroudliponthewheel). Onceyouhavethewheel
approximatelylocatedtightenthe½”pedestalbolts
to90ft-lbs.
TYPICALFAN-CONECLEARANCE
c. Next make sure that the wheel is located
properly and tighten the trantorque bushing.
Once the wheel depth alignment is verified
tighten the trantorque bushing to 80ft-lbs. Please
note that a bar or some other device may need to
be inserted into the blade of the fan wheel to hold
the wheel while applying the torque. Please refer
to Table 1 for shaft size and associated socket
size to be used to tighten the trantorque.
7. Centertheconeinthewheelshroud. Refertopages10
and11 for theproperwheel/conealignment.
a. The cone alignment can be a tedious process as
there are no tools that effectively work to align the
cone. It is a hands on process to align the cone.
Huntair cones have a running clearance of about
1/16"(seefigure3).
b. Startbylooseningthefourscrewsthatwereusedto
holdtheconeforthedepthalignment. Holdthecone
withonehandandwiththeotheruseadrilltoattach
ascrewtoholdtheconeinplace. Feelbetweenthe
wheelinletshroudandtheconeandsetthegap to
approximately 1/16" and tighten the screw in that
location(topoftheconeisusuallythebestplaceto
start). Atthis point youshouldbeabletomovethe
coneaboutthatscrewlocation,adjusttheconeon
the left or right until there is approximately a 1/16"
gap.
c. Spinthewheelbyhandatthispointtocheckforany
clearance issues. If the wheel spins clear tighten
theremaining screws on the cone. Checkthat the
wheelspins clearafter tightening each screw.
8. Attach the inlet airflow straightener using the formed
anglebrackets(seefigure2).
a. Start by loosely installing (don’t tighten screws all
theway)thebottomangle bracket. Set the airflow
gridontheanglebracket. Alignthesideofthegrid
with the end of the bracket.
b. Install either vertical angle bracket loosely and
check fit up.
c.Install the two remaining brackets and tighten (see
figure2).
9. Wire the motor per the electrical schematic provided.
Make sure to wire the motors to NEC standards.
10. Bump test the motors and check for proper rotation.
TYPICALFAN-CONE
CLEARANCE
Frame Shaft TranTorque Socket
48 0.625 0.875
56 0.625 0.875
143T 0.875 1.25
145T 0.875 1.25
182T 1.125 1.5
184T 1.125 1.5
213T 1.375 1.75
215T 1.375 1.75
TABLE 1
14

CAUTION: Thisunithasrotatingparts,highvoltage,and
possibly high temperature solutions or components.
Safety precautions must be exercised during installa-
tion, operation and maintenance. Service should only
be performed by a qualified technician who has been
speciallytrainedtoserviceairconditioningequipment.
PRELIMINARYINSPECTION
1. Disconnect all power to unit. Lockout and label all
disconnectmeanstopreventaccidentalpowerapplica-
tion.
2. Verify that all field electrical wiring and connections
includingelectricalgroundingaremadeinaccordance
with the National Electrical Code and local codes.
Verifythatsupplyvoltage(s)agreewithunitdataplate.
Check all wiring for completeness and terminals for
tightness.
3. Inspect all supplementary cooling (if any) piping for
leaks and conformance with the Uniform Plumbing
Codeand local codes.
4. Removesupplyandexhaustfancompartmentcovers
andmakesureallsteelbanding,boltsandwoodbraces
installedforshippinghavebeenremovedfromfansprior
to starting the unit.
5. Remove filter section access panel and ensure all
filters are securely in place. Replace and secure the
access panel.
6. Check all unit manual reset devices and reset if
necessary.
7. Checksupplyandexhaustductsforobstructionsand
damperpositionsandopenalldiffusers.
FANSTART-UP
1. Removetheexhaust/supplyfanhousingaccesspanel
andinspectthefananddriveassembly. Imageabove
rightshowsatypicalfanandmotorarrangementusing
Fanwall Technology®.
2. Beforeoperation,startthemotorslowlytoensurethe
fanrotationiscorrect.Itshouldberotating“CWR”when
looking at the motor end.
If the fan wheel is not rotating correctly, check the
motorpowerleadsforproperinstallation
Alsocheckinletconealignment to the fan wheel. Fan
wheelshouldnotberubbingontheinletcone. Ifcone
alignmentisrequiredloosentheretainingfastenersfor
theconeandadjustconeforproperclearancefromfan
wheel.
3. Replace and fasten down the fan housing access
panel.
IMPORTANTNOTICE:Exhaust and supplyairquanti-
tiesas specified on the unit data plate are essential for
safe and economic operation. The unit exhaust and
supply fan RPMs were carefully set at the factory to
deliverthespecifiedairquantityatthespecifiedexternal
static pressure. We cannot overemphasize that these
valuesbefield verified as externalstatic pressures are
oftenfoundtobedifferentthanwhatwasanticipated.
1.Supply
a. Supplyairvolumemeasurementsshouldbemade
using AMCA suggested methods. This would
normallybeatraverseofthesupplyductorducts.
For test and measurement guidelines, write to:
AMCA,30WestUniversityDrive,ArlingtonHeights,
IL 60004
b. Startthesupplyfan,observethemotorizedinletair
damper(ifany)tobecertainthatitfullyopens(90°).
Checkthefanforproperrotation.
c. Measureairflowandcomparetothevaluestamped
ontheCSUdataplate. Adjustthesupplyfanmotor
drive pitch to increase or decrease the fan speed
untilthedesiredairflowisreached.
d. Oncetheproperairvolumehasbeenestablished,
check the supply motor AMP draw against the
motor nameplate full load amp’s to be sure the
motorisnotoverloaded.Allaccessdoorsmustbe
closed while checking amps.
AIRFLOWVERIFICATION
15
START-UP

TROUBLESHOOTING
16
SYMPTOM POSSIBLE CAUSE FIELD TEST REMEDY
FAN WILL NOT
START OR RUN AT
ALL
1.
2.
3.
4.
No main power.
Faulty control circuit
auxiliary contact on
unit disconnect switch.
No control transformer
output.
Tripped overloads on
motor starters.
1.
1A.
1B.
2.
3.
3A.
4.
4A.
Check main power fuses with ohm meter.
Check disconnect switch.
Use volt meter to check for proper main
voltage to unit.
Check contact with ohm meter.
Check primary and secondary fuses on
transformer.
Check control transformer primary and
secondary voltages.
Verify overload trip setting is at or slightly
above the motor nameplate fla.
Reset overloads and measure operating
current of motors.
1.
1A.
1B.
2.
3.
3A.
4.
4A.
Correct problem and replace fuses with size
indicated on electrical diagram.
Turn to "On" position.
Restore power to unit.
Replace switch if faulty.
Correct problem and replace fuse(s) with
size indicated on electrical diagram.
Replace transformer if faulty.
Adjust overload trip setting (not to exceed
motor fla x 1.15 for ODP motors and not to
exceed motor fla for TEFC motors).
If current values are above nameplate fla, go
to Motor Failure.
MOTOR FAILURE 1.
2.
3.
Improper supply
voltage.
Motor overloaded.
Motor overheating.
1.
1A.
2.
2A.
2B.
2C.
3.
3A.
Check voltage at motor.
Check for proper wiring at motor.
Check amperage at motor.
Check rotation of fan.
Check motor shaft for freedom of movement.
Check for excessive cfm and/or static
pressure.
Verify correct supply cfm.
Check for temperatures above 110°F.
1.
1A.
2.
2A.
2B.
2C.
3.
3A.
If incorrect, correct to proper value.
Wire motor per diagram on motor or inside
motor junction box.
If amperage outside of motor nameplate
limits, conduct additional field tests that
follow.
Correct rotation, if necessary.
Replace motor or motor bearings if
necessary.
Correct cause of high static pressure and
adjust airflow per start-up section
instructions
Adjust cfm to unit data plate value.
Consult factory for motor heat shield.
SYMPTOM POSSIBLE CAUSE FIELD TEST REMEDY
FAN CAPACITY
LOW 1.
2.
3.
4.
5.
6.
High external static
pressure.
Dampers improperly
positioned.
Air leaks in system.
Damaged fan wheel.
Incorrect fan rotation.
Obstructed inlet.
1.
2.
3.
4.
5.
6.
Check actual pressure against unit data plate
pressure.
Verify proper position of unit air control
dampers (if any) and all external
dampers/diffusers.
Check ductwork and duct connections for
leaks.
Visually inspect wheel.
Check wheel rotation with arrow on fan.
Inspect inlet.
1.
2.
3.
4.
5.
6.
Correct static pressure. If not possible,
consult factory.
Correct damper position.
Repair any leaks.
Replace fan wheel if necessary.
Correct rotation if backwards.
Clear inlet.
VIBRATION AND
NOISE 1.
2.
3.
4.
5.
6.
7.
Misalignment of
wheel.
Unstable foundation.
Dirty fan wheel.
Broken or loose bolts
or setscrews.
Fan delivering more
than rated capacity.
Loose dampers.
Shipping bolts and/or
braces not removed.
1.
2.
3.
4.
5.
6.
7.
Check alignment.
Check roof curb or mounting platform for
stability.
Inspect fan wheel.
Check bolts and setscrews for tightness.
Refer to airflow verification in start-up
procedure section.
Inspect dampers.
Verify all shipping blocks and braces are
removed.
1.
2.
3.
4.
5.
6.
7.
Align if necessary.
Correct roof curb or platform installation
deficiency.
Clean fan wheel.
Replace or tighten as necessary.
Adjust drives per instructions in start-up
procedure section.
Tighten dampers if loose.
Remove shipping attachments.

FWT START-UP REPORT
VFDUNIT MODELS
Unit Nameplate Data:
Model No.
Serial No.
Supply CFM: Supply HP:
Exhaust/Return CFM: Exhaust/Return HP:
Mechanical System Checks
1 Visually inspect fanwall for damage.
a. On Discharge side look for damage to Fans, Motors, Cells, etc.
b. On Inlet side look for damage to inlet straigtening grid and frame as well as cells.
2 Fan Wheel / Motor
a. Rotate fan wheel by hand to ensure it is properly aligned with inlet cone.
b. Check motor bearings as fan wheel is rotating. Bearings should operate freely and be free of noise.
c Check that the shaft grounding kit has been installed correctly.
d Check backdraft damper for smooth operation if supplied. Open damper by hand to ensure a full
range of motion without obstruction.
3 HVAC System
a. Check that all ducts, dampers and registers are set.
b. Check that all openings and pentrations are sealed.
Electrical System Checks
1 De-Energized
a. Check for any loose connections
b. Check circuit breaker disconnect mechanisms / Mechanical interlocks operate properly
c. Check VFD size and rating (voltage and horsepower)
d. Check and set motor start protectors (MSP) for correct size and setting.
e. Ensure all system components are adjusted to proper settings (temperature, amperage)
2 Energized
a. Connect proper input voltage power to line side of panel
b. Energize incoming power circuit.
c. Check for proper line voltage.
d. Check voltage between all neutral terminations and panel ground (should be zero volts)
e. Check internal power supplies for proper voltage output(s) and adjust as required
f. Test and verify proper operations of all GFCI devices
g. Check operation of cabinet cooling fans, adjust thermostat as specified on drawing
h. Check and record all voltage readings
i. Energize MSP one at a time to ensure correct motor rotation.
j. Ensure that CFM monitoring system is functioning (if applicable).
Comments
Huntair recommends that the following FWT START~UP REPORT be performed on each unit and the results filed with the
appropriatefacilityengineeringoffice.
17