SystemAir HHFlex Installation, Operation And Maintenance Instructions

Brand: SystemAir

Model: HHFlex

Category: Split-system air conditioners

Type: Installation, Operation And Maintenance Instructions

HHFlex Air Handling Units

Installation, operation and maintenance instructions

Content

Safety considerations

4 1.1 - General

4 1.2 - Applications

4 1.3 - Instruction types

6 1.4 - Disposal of parts/materials

Transport and lifting instructions

6 2.1 - General

6 2.2 - Transport and storage

6 2.3 - Roof edge protection during transport (outside installation)

7 2.4-Ofoadingandhoisting

7 2.5 - Horizontal transport

7 2.6 - Storage

7 2.7 - Assembly

Checklist of start-up check points

9 3.1 - Checklist of start-up check points

Start-up instructions

11 4.1 - Casing

11 4.1.1 - Casing panels

11 4.1.2 - Doors and access covers

11 4.1.3 - Flexible connections

11 4.1.4 - Earthing

11 4.1.5 - Connected ducts

12 4.1.6 - Outdoor air intake

13 4.1.7 - Assembly and placement of the air handling unit

13 4.1.8 - Air contamination

13 4.1.9 - Condensation in or on the AHU

13 4.2 - Dampers

13 4.2.1 - Dampers

14 4.2.2 - Recirculation dampers

14 4.3-Airlters

14 4.4 - Heaters

14 4.4.1 - Hot water coil

15 4.4.1.1 - Coils containing glycol

15 4.4.2 - Electric heater

16 4.4.3 - Steam heaters

16 4.5 - Coolers

16 4.5.1 - General

17 4.5.2 - Glycol in elements, see 4.4.1.1

17 4.5.3 - DX-coils

17 4.6-Heatrecoverywheel

18 4.7-Plateheatexchanger

18 4.8-Directsteamhumidication

18 4.8.1 - General

18 4.8.2 - Direct steam humidication

19 4.9-Electricsteamhumidier

19 4.9.1 - General, see 4.8.1

19 4.9.2 - Electric steam humidier

19 4.10-Waterhumidiers

19 4.10.1 - General

19 4.10.2 - Spray humidier

19 4.10.3 - Determining the quantity of spray water and the condensation factor

20 4.10.4 - Infrasonic humidication

20 4.11 - Fan

22 4.11.1 - Plug fans

23 4.11.2 - Frequency converters

23 4.11.3 - Plug fans with integrated EC motors

23 4.12 - Silencers

23 4.13-Lightning

Maintenance checklist

25 5.1-Checklistofcheckpointsandmaintenanceintervals

Maintenance and operating instructions

26 6.1 - General

26 6.2 - Casing panels

26 6.2.1 - Inside installation

26 6.2.2 - Outside installation

26 6.3 - Doors and access covers

26 6.4-Flexibleconnections

26 6.5-Earthing

26 6.6 - Dampers

27 6.7-Outdoorairintake

27 6.8 - Filters

27 6.9 - Heaters

27 6.9.1 - Hot-water coil

27 6.9.2 - Electric heater

28 6.10 - Coolers

28 6.10.1 - Chilled-water coil

28 6.11-Heatrecoverywheel

28 6.12-Plateheatexchanger

28 6.13 - Recirculation damper

28 6.14-Waterhumidiers

28 6.14.1 - General

29 6.14.2 - Spray humidier

29 6.14.3 - Infrasonic humidication

29 6.15 - Fan

29 6.15.1 - General

29 6.15.2 - Bearings

29 6.15.3 - Transmission

30 6.16 - Silencers

Abbreviations

AHU - Air Handling Unit

PED - Pressure Equipment Directive

BMS - Building Management System

SSR - Solid-state Relay

SUP - Supply Air

 ETA -ExtractAir

ODA - Outdoor Air

 EHA -ExhaustAir

 HMI -Human-MachineInterface

RH - Relative Humidity

VU - Ventilation Unit

NRVU - Non-Residential Ventilation Unit

BVU - Bidirectional Ventilation Unit

UVU - Unidirectional Ventilation Unit

4 | HHFlexAirHandlingUnits

Safety Considerations

1.1 - General

TheHHFlexairhandlingunits(AHUs)havebeendesigned

andmanufacturedinaccordancewiththeCEmachine

directive. In order to guarantee safe operation and use of

theunit,pleasecarefullyreadandobservetheinstructions

inthisdocumentandpayspecialattentiontothewarnings

thatapplytothisunit.Anymodicationsinthedesign

and/orinstallationoftheAHUthatarecarriedoutwithout

priordiscussionwithSystemairB.V.andwithoutadvance

writtenagreementwillresultinthelossoftherighttoany

warranty claims and any claim for injury to personnel as a

resultofthesemodications.Allworkmustbecarriedout

bysufcientlytrainedpersonnel.

All applicable personnel safety devices must be used

toensuresafeworkingconditions.Safetyglovesand

glasses must be worn for all maintenance operations. A

respiratoryprotectionmaskmustbewornwhenchanging

thelters.TheA-weightedequivalentcontinuoussound

pressurelevelcanbeabove80dB(A),dependingonthe

motor size, fan size, fan speed andtheAHUinstallation

location.Thismeansthateardefendersmustbeworn,

whenthefanisrunning.

Alldoorsandhatchesmusthaveatleastonelockthatcan

onlybeopenedwithaspecialdevice.Heatingandcooling

coilsaremanufacturedandsuppliedinaccordancewith

guidelinesofthePressureEquipmentDirective(PED).

Donotwalkontheroofpanelsofunitsinstalledinsideor

outside.Onlysufcientlyqualiedpersonnelisallowed

toworkon(electrical)components.Allpowersuppliesto

theunitmustbedisconnected,beforeanyworkcanbe

carriedout.Switchoffthesupplyvoltageusingthemain

disconnectswitch.

CAUTION:Generalelectricheatershaveaseparatesupply

andmustbeswitchedoffseparately.

Ifworklightingisrequired,useonlylightingwith24V

maximum.Useofelectricalequipmentwithavoltage

above48Visonlypermittedifanearthleakageswitchis

installedthatcomplieswithlocalandnationalregulations.

1.2 - Applications

TheAHUisdesignedforthemovementandconditioning

ofair,unlessotherwiseagreedduringthedesignstage.

FromJanuary1st,2016AHUsmustcomplywithEU

regulation 1253/2014 implementing ErP directive

2009/125/EC,iftheyarewithinthescopeofthe

regulationandthedirective.

EUregulation1253/2014ispartoftheCE-marking.

Thisregulationappliesfor:

• ‘ventilation unit (VU)’ means an electricity driven

applianceequippedwithatleastoneimpeller,one

motor and a casing and intended to replace utilised

air by outdoor air in a building or a part of a building.

WhereanAHUisregardedasa:

• ‘non-residential ventilation unit’ (NRVU) means a

ventilationunitwherethemaximumowrateofthe

ventilationunitexceeds250m

/h,and,wherethe

maximumowrateisbetween250and1000m

/h,

themanufacturerhasnotdeclareditsintendeduseas

beingexclusivelyforaresidentialventilationapplication.

Theregulationdenestwotypesofventilationunits.

Thesemustbeplacedonthemarketorputintoservice,in

accordancewiththerequirementsofthisregulation.

• ‘unidirectional ventilation unit’ (UVU) means a ventila-

tionunitproducinganairowinonedirectiononly,

eitherfromindoorstooutdoors(exhaust)orfromout-

doorstoindoors(supply),wherethemechanically

producedairowisbalancedbynaturalairsupplyor

exhaust

• ‘bidirectional ventilation unit’ (BVU) means a

ventilationunitwhichproducesanairowbetween

indoorsandoutdoorsandisequippedwithboth

exhaustandsupplyfans

ThefollowingunitcombinationsareconsideredasaBVU:

• TwoormoreunitscombinedwithaRACheatrecovery

system

• Twoormoreunitsdirectly(withoutbuilding-side

ductwork)connectedwithamixingchamber.

If two or more units are combined as described above

on-siteinthebuildingbyathirdparty(forexampleinstaller),

aBVU(basedonCE-markedUVUs)willbe“putintoservice”.

Thismeansthethirdpartyhastodeclareproductconformity

withtherequirementsofaBVUandCEmarking.

Unitscanbesuppliedwithoutaccessoriesthatareindicated

asmandatoryinregulation1253/2014.Theseaccessories

mustbesuppliedandinstalledbyathirdparty.Theaccesso-

riesthatarenotsuppliedbutmandatoryareindicatedin

thetechnicalspecicationoftheAHU,e.g.fanswithvariable-

speeddrive,thermalbypassdevice,heatrecovery,visual

signalingoralteralarm(2018regulation).

1.3 - Instruction types

Thefollowingwarningpictogramsandlabelswithtextareused.

Lifting point

ThispictogramshowswheretheAHUmustbeliftedand

ispositionedonthesupportbeam.

HHFlexAirHandlingUnits | 5

Lifting prohibited

Thispictogramshowsthatnohorizontaltransportdevices

mustbeplacedunderthisframesection,suchaspallet

liftersortheforksofforklifttrucks.Itisalsoforbiddento

placeliftingdevicesfortransportandstorageunderthis

frame element.

Earthing

ThispictogramindicateswheretheAHUcanbeearthed

andisononeofthesupportbeamsbeneaththecasingin

thefansection.Ifaunitconsistsofseveralsections,only

onesectionneedstobeearthed,providedthesections

areconnectedinthecorrectway.

• TheelectricalcomponentsintheAHUmustbeearthed,

exceptforcomponentswithdoubleinsulationand/or

componentswithasupplyvoltagebelow50V.

• Theelectricalcomponentsmustbeinstalledin

accordancewithnationalandlocalregulations.

Rotating parts

Thispictogramindicatesthattherearerotatingparts

behindthisaccesscover,doororpanelwhichmaycause

injury.Thecomponentsthatincluderotatingpartsare

thefanandheatrecoverywheel.Iftherearespecial

customer-speciccomponentsbehinddoors,access

coversorpanelsthatincluderotatingpartsandposea

potentialrisk,thisisalsoindicatedbythispictogram.

Hot surfaces

Thispictogramindicatesthattherearecomponents

behindthisaccesscover,doororpanelthatcancause

seriousburnswhentouched.Thesurfacesthatmaybe

hotaretheheatersurfaces.Iftherearespecialcustomer-

speciccomponentsbehinddoors,accesscoversor

panelsthathavehotsurfacesandposeapotentialrisk,

thisisalsoindicatedbythispictogram.

Electrical voltage

Thispictogramindicatesthatthereareelectrical

componentsbehindthisaccesscover,doororpanel

thatmaybedangerousfortheuser/installer.Only

qualiedpersonnelispermittedtocarryoutworkon

thesecomponents.Forthisworktheregulationsofthe

applicable international (e.g. IEC 61557, EN 50110 and

ES 59009) and national (e.g. BS 7671) standards must be

observed.Thepictogramisattachedtotheaccesscover

fortheelectricheatercontrolbox.

Central data

ThislabelcontainsthedatafortheAHU,suchasorder

number,positionnumberetc.Thelabelisnormallylocated

ontheaccesscoverorthedoorofthefanassembly.Ifthe

AHUconsistsofseveralparts,eachpartmusthavealabel

withtherequireddata.

Opening the fan door

Thispictogramispositionedontheoutsideofthedoor

oraccesscoverofthefanassembly.Thispictogram

warnsthatthefanmusthavebeenswitchedoffand

deenergisedforaminimumoftwominutesbeforethe

doororaccesscoverisopened.Thispictogramalso

indicatesthattransportbracketsmustberemovedbefore

thefanisstartedup.

6 | HHFlexAirHandlingUnits

! Waarschuwing !

Voor openen deuren, ventilator

uitschakelen, spanningsloos

maken en uit laten lopen

(minimaal 2 minuten).

Transportbeugels

Verwijder transportbeugels voor

opstarten ventilator.

! Warning !

Before opening the doors, switch

off and deenergise the fan and

allow it to run down

(minimum 2 minutes)

Transport brackets

Remove transport brackets before

starting up the fan.

! Attention !

Avant ouverture des portes, le

ventilateur doit être déconnecté

et avoir eu le temps, de s’arrêter

completement

(2 minutes minimum)

Fixations de transport

Retirer les xations de transport

avant la mise en route.

! Gefahr !

Vor Öffnen der Türen den

Ventilator abschalten, span-

nungslos machen und zum

Stillstand kommen lassen

(mindestens 2 Minuten warten).

Transportsicherungen

Transportsicherungen vor der

Inbetriebnahme demontieren.

200034906

Other warning labels

! Waarschuwing !

Vervuilde lters zijn brandbaar.

! Warning !

Polluted lters are inammable.

! Attention !

Les ltres encrassés peuvent être

inammables.

! Gefahr !

Verschmutzte Filter sind leicht

entammbar.

200034907

! Waarschuwing !

Na het uitzetten van de

elektrische verwarmer moet de

ventilator nog

minimaal 5 minuten draaien.

! Warning !

After switching off the electric

heater the fan must continue to

run for at least 5 minutes.

! Attention !

Après la déconnexion de la

résistance électrique, le venti-

lateur doit continuer à tourner

pendant au moins 5 minutes.

! Gefahr !

Nach Abschalten der

Elektroheizung muss der Ventilator

noch mindestens 5 Minuten

weiterlaufen.

200034908

CAUTION: All doors and access covers must be closed

beforestartinguptheAHU.

Lifting and transport

AninstructionattachedtotheAHUdescribestheprocedures

thatmustbefollowedforliftingandtransport.The

followingchaptercontainsfurtherdetails.

1.4 - Disposal of parts/materials

• Thepackagingmaterialmustbedisposedofina

responsiblemannerandinaccordancewithlocal

regulations.

• Componentsthatarereplaced,mustbedisposedof

as described above.

Transport and lifting instructions

2.1 - General

• TransportandliftingoftheAHUmustalwaysbein

accordancewiththeinstructionsbelow.Ifthese

instructionsarenotobserved,theunitmaybe

irreparablydamaged,andpeopleintheimmediate

vicinityoftheunitareendangered.SystemairB.V.does

notacceptanyresponsibilityiftheseinstructionsare

not observed. Transport and lifting must be carried out

byqualiedpersonnel.TheAHUmustonlybeliftedwith

liftingbarssuppliedbySystemairB.V.(boxprole30x

30x4mm,quality52ortube48.3x6.3quality52).

• In special cases, lifting can be done using a base or

liftingframettedwithliftingplateswithfastening

holesthatuseabowanchorshackleandascrew

collar pin.

• Liftingmustbecarriedoutinaccordancewithlocal

regulationsandwiththehelpofcertiedliftingaids.

• Only one set of lifting bars is supplied per order/

positionnumberperunitwidth(ifordered).These

liftingbarsaresuitableforsingleuseandonlyforthe

partsofthisorder/positionnumber.Theliftingbarsare

certiedbyanauthorisedpersonusingatypetest.

2.2 - Transport and storage

Duringtransportandstoragetheairhandlingunitmust

onlybesupportedunderthedesignatedliftingpoints.

Supportingandliftingunderthecrossbeamsisprohibited.

Thisisindicatedonthecrossbeamwiththefollowinglabel.

2.3 - Roof edge protection during transport (outside

installation)

Duringtransportbytrucktheunitsareattachedtothe

loadingsurfacewithtieropes,pulledacrosstheunit

towardsthesideedgesofthetruck.

HHFlexAirHandlingUnits | 7

Toprotecttheroofedgeonoutsideunitsthatarewider

than1500mm,protectionplatesareaddedinplaceof

thetieropestopreventdistortionoftheroofedge.

2.4 - Ofoading and hoisting

DependingonthedimensionsoftheAHUandthe

situationonsite,theAHUsaresuppliedinpreviously

agreed transport sections.

Beforeproceedingwiththetransportandinstallation

ofthecasingsections,alwaysconsulttheapplicable

dimensionaldrawingsthatgivethedimensionsand

weightsofthesections,aswellastheinstallation

sequence.

Theweightisgivenoneachtransportsection.Each

transportsectionisequippedwithasubframewithfour

liftingpoints.Thesepointsaremarkedwiththelabel

shownbelow.

Forofoadingaswellashoistingliftingcablescanbe

attachedtotheliftingbars.Evenlypositionedspacerbars

shouldbeusedbetweentheliftingcablestoprevent

damagetothetopoftheunitandensurethatnoexcess

pressureisappliedtothesidepanels.Forhoistingplease

ensurethattheweightisevenlydistributed.

TheAHUmustnotberaisedunderthecrossbeamsduring

liftingormovingoperations.Thisisindicatedbythelabel

below.

2.5 - Horizontal transport

Forhorizontalmovementpalletliftersortransportskids

canbeplacedundertheinstallationframeorunderthe

liftingbars.Itisimportantthatthesesupportthelifting

points.Atnotimeshouldthecrossbeamsattheendsof

theunitsectionsbeusedforjackingortrackingtheAHU.

FOR HORIZONTAL TRANSPORT ALWAYS PROVIDE SUPPORT

UNDER THE LIFTING POINTS.Theuseofbarsasrollerscan

resultindamagetotheinstallationframe.

2.6 - Storage

ThepackaginginwhichtheAHUissuppliedcancause

condensationtoformbetweenthepackagingandthe

AHU,iftheunitisstoredinanunconditionedplace.

IftheAHUisnotimmediatelyuseditisrecommendedto

storeitinaconditionedlocationon-site.IftheAHUiskept

outsideforashortperioddirectsunradiationmustbe

avoided.

Ifthefansareshutdownforalongerperiod(longerthan

threemonths)bearingdamagecanoccur.Toprevent

thisitisrecommendedtoloosenthebelttensionorto

temporarilyremovethefanbelts.Whenthefansare

re-startedthebelttensionmustberesettothespecied

tension.Controlledrotationofthefanimpellercanalso

preventthistypeofdamage.Thisisalsorecommended

for direct-drive fans.

2.7 - Assembly

Fortheassemblyofourunitspleaserefertoour

instructionmanual“Mountinginstructions”.

8 | HHFlexAirHandlingUnits

Example conguration of HHFlex with heat recovery wheel

M1M1

HHFlexAirHandlingUnits | 9

Legend

A. Outdoorairintakedamper

B. Supplyairlter

C. Anti corrosion screen

D. Pre-heater

E. Supply air fan

F. Heater(hot-water)

G. Cooling coil

H. Droplet eliminator

I. Steamhumidier

J. Supply air damper

K. Extractairdamper

L. Extractairlter

M. Extractairfan

N. Heatrecoverywheel

O. Exhaustairdamper

Legend

1. Actuator, outdoor air damper

2. Frequency converter, supply air fan

3. Mainswitchsupplyairfan

4. Pressure sensor, supply air fan

5. Actuator, supply air damper

6. Actuator,extractairdamper

7. Mainswitchextractairfan

8. Frequencyconverter,extractairfan

9. Pressuresensor,extractairfan

10. Actuator,exhaustairdamper

11. Pressureswitch,supplyairlter

12. Frostprotectionthermostat,heater

13. Pressureswitchextractairlter

Dimensions

W=widthunitnx160+98

H=heightunitnx160+98

H1=heightbaseframeinmm

Thegreyareasinthetableindicate

standardised units.

Custom sizes are possible.

Theserviceareaforreplacementofcomponentssuchas

coilsandfansdependsonthecabinetwidthandmust

beatleastequaltothecabinetwidth.

2.5

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Checklist of start-up check points

3.1 - Checklist of start-up check points

Beforecommissioningtheunit,allfunctionsbelowand

theassociatedcomponentsmustbechecked,usingthe

checklistbelow.Thetableonthenextpageshowsa

generaloverviewoftheoperationsrequiredtofacilitate

theinstallationoftheAHU.Thefollowingpagesgivea

moredetaileddescriptionoftheindividualcomponents.

CAUTION:BeforestartinguptheAHUensurethatthe

componentshavethecorrectconnectionvoltageand

connecttheminaccordancewiththeregulations.The

doorsandaccesscoversmustbeclosedandtheAHU

mustbeearthed.

Start-up check points

Function Components Check points Start-up

General All functions Remove obstacles and loose debris from compartment

All functions Check for possible condensate and if necessary dry the parts

Indoor installation/

outdoor installation

Internal and external panels Damage

Joints Cracks

Doors/access covers Must be closed and locked before start-up

Flexible connections Correct installation

Earthing Correct earthing in accordance with regulations

Roof covering (outdoor installation) Check if roof is completely watertight

Dampers Correct operation

Blades fully closed and at zero position

Actuator Correct operation

Check rotation direction

Actuator end position same as damper end position

Filters Correct lter type

Are the lters correctly installed

Pressure differential gauge Correct operation

Pressure differential switch Correct operation/set-up

Droplet eliminator Bent ns

Siphon Correct connection

10 | HHFlexAirHandlingUnits

Start-up check points

Function Components Check points Start-up

Heaters Hot-water coil Correct connections

Air vent the coil

Leakage

Frost protection thermostat connected

Electric heater Check heater earth

Check hatch earth

Correct fuse size

Check wiring diagram

Check for possible condensate and if necessary dry the heater

Steam heater Correct connections

Completely drain water

Leakage heater and pipework

Testing heater and pipework

Coolers Chilled-water coil Correct connections

Air vent the coil

Leakage

Droplet eliminator Correct alignment

Drain trap Correct connection

Heat recovery wheel Rotor Check rotation direction

Seal Correct seal towards wheel

Drive Check connection voltage

Correct connection

Check current in all phases

Drive belt Check tension

Rotation monitor Correct connection

Controller Correct connection

Plate heat exchanger Damper (if used) Correct operation

Actuator (if used) Correct operation

Siphon trap Correct connection

Droplet eliminators (if used) Bent ns

Direct steam

humidication

Connections and attachments See documentation supplied

Test humidier and pipes

Leakage

Actuator Check connection and operation

Electric steam

humidication

Connections and attachments Check connection voltage

Check connection and operation

Water humidiers Spray humidiers See documentation supplied

Infrasonic humidiers See documentation supplied

Check connection voltage

Check exhaust

Check hoses

Check atomisation

Check pressostats

Fan Transport protection brackets Remove

Fan housing and fan compartment Remove obstacles and loose debris from the fan and fan compartment

Fan compartment, fan, motor,

frequency converter

Check for possible condensate and if necessary dry the parts

Impeller Check rotation direction

Motor Check connection voltage

Correct connection

Check current in all phases

Drive belt Check tension

Flexible connections Correct installation

Operating switch Check connection

Ensure switch is locked off during checks

Pressure switch/sensor Operation

Silencer (duct silencer) Damage of the top layer

Check for air-tight connection at the correct opening

Is the duct silencer sufciently supported

Frequency converter Connections Correct connection/complies with EMC

Frequency converter Check for possible condensate and if necessary dry the converter

Voltage Check connection voltage

Settings Check correct settings

Phases Check voltage in all phases

Lighting Lamp Check connection voltage

Switch Check connection

Control panel Components Check for possible condensate and if necessary dry the components

Power supply Check power supply voltage

Check neutral

Correct earthing in accordance with regulations

Power supply with correctly sized fuses

External sensors/control devices Connect according to wiring diagram

Alarms Connect to BMS or external panel

Controller Parameters Set all specic project parameters

HHFlexAirHandlingUnits | 11

Start-up instructions

4.1 - Casing

Theunitdata,suchasordernumber,positionnumberetc.

isgivenonthenameplate.

4.1.1 - Casing panels

ChecktheAHUpanelsforanydamage.Anydirtorstains

mustberemovedfromthesurfacetopreventpossible

long-termdamage.Buildingdebrisleftontheroofof

units installed inside and outside must be removed. Dirt

canberemovedwithwaterandamildhouseholdsoap

solution.Damagecanberepairedbythoroughlycleaning

theaffectedsurface,thentreatandpaintasnecessary.If

applicablecheckthesealingjointsandrepairifrequired.

4.1.2 - Doors and access covers

Checktheoperationofdoorhandles,locksandmovement

ofthehinges.Checkifthedoorclosure(ontheinsideof

thedoor)istightlytted,sothattherearenoexcessive

airleaksatthedoors.ForoutsideinstallationoftheAHU

checkthestormcord.Forthesectionsthatareunder

pressureitisrecommendedtoorderadoorlockwithan

pressure safety device.

CAUTION: Doors and access covers must always be closed

beforestartingtheunit.

4.1.3 - Flexible connections

• Checkthatallexibleconnectionsarermlyattached

totheAHU.Ifnecessary,tightenloosescrews.

• Thestretchedlengthofasingle-skinexible

connectionis130mm,butaexibleconnection

mustNOTbeinstalledstretchedbetweentheAHU

andtheduct.Onceinstalledtheoperatinglengthof

theexibleconnectionmustbe100mm.

4.1.4 - Earthing

EnsurethattheAHUisearthedcorrectlyandinaccordance

withlocalregulations.Alabelonthesupportframe

indicateswheretheunitshouldbeearthed.

4.1.5 - Duct connections

Therearecornerframesattachedtoallopeningstobe

connected.Thesecornerframesallowconnectionofthe

airducttotheAHU.

• ItisrecommendedtouseEuroproleconnections

(typeE30)atthecornerframeaswellasattheduct

to be connected.

• Europroleconnectionsareavailableinxedlengths

andcanbecuttotherequiredlengthwithasaw.

Theseprolescaneasilybeplacedoverthecorner

frame.Allowforamaximumproleheightof30mm,

sothatductsthatarepositionedoneabovethe

othercanbeinstalledcorrectly.

• Thefourcornersbetweentheprolescanbecompleted

withacornerpiece(typeH30).

• Theproleatthecornerframecanbeattachedto

theproleontheductusingadriveslip(typeSR).

• Attachingself-adhesivetapebetweenthetwo

prolesensuresanairtightseal,asshowninthe

drawing below.

Legend

1. AHU

2. Duct connection

12 | HHFlexAirHandlingUnits

• Thecornerframehasalengthof40mmandextends

32mmbeyondtheexternalAHUdimension,asshown

inthedrawingbelow.

• Theexibleconnectionprotrudesbeyondthe

externalAHUdimension,asshowninthedrawing

below.

Legend

1. AHU

2. Flexibleconnectionordamper

3. Duct connection

(single-skinexibleconnection-±30mmpresst)

• Thecombinationofexibleconnectionsanddampers

extendsbeyondtheexternalAHUdimension,as

showninthedrawingbelow.

Legend

1. AHU

2. Damper

3. Flexibleconnection

4. Duct connection

(single-skinexibleconnection-±30mmpresst)

4.1.6 - Outdoor air intake

• Ensurethattheairintakeductiscorrectlyconnected.

Highairvelocitiesmustbeavoided,andnoraindrops

shouldgetintotheduct.Thisispreventedbyinstalling

rainprotectionairintakegrilles(Caution:themaximum

airvelocityforthegrilleisasgivenbythesupplier).

Therearairintakeductmustbesizedtoavoidhigher

thanallowableairvelocitiesinthegrille.Highair

velocitiesintheopeningscanalsobecausedby

windattacksatoneoftheopenings.Ifthesecanbe

expectedfortheinstallationorgeographicallocation,

trytominimisethemwithpartitions.Ifthereisany

possibilitythatrainwatercanbedrawnin,droplet

eliminatorsarettedwithasuctiongrilleinthe

outside air duct.

• Apre-heaterforthelterscanbeinstalledtoprevent

mistcausingthelterstobecometoowet.The

pre-heaterwillreducetherelativehumidityoftheair.

Connectionoftheoutdoorairintakeduct

Connectionoftheoutdoorairintakeducttoaunitwith

damper register:

• Connecta500mmlongadapterpiecetothecorner

frameoftheairhandlingunit.

• Insulatetheinsideofthecompleteadapterpieceup

totheunitpanel.

• Insulatetheoutsideoftheadapterpiecesothat

thereisa250mmoverlapbetweeninsideand

outside insulation.

• Theremainderoftheadapterpieceneedstobe

insulatedontheoutside,asshowninthedrawing

below.

Connectionoftheoutdoorairintakeducttoaunitwithout

damper register:

• Connecta500mmlongadapterpiecetothecorner

frameoftheairhandlingunit.

• Insulatetheinsideofthecompleteadapterpieceup

totheunitpanel.

• Insulatetheoutsideoftheadapterpiecesothat

thereisa250mmoverlapbetweeninsideand

outside insulation.

• Theremainderoftheadapterpieceneedstobe

insulatedontheoutside.

Legend

1. AHU

2. Duct connection

HHFlexAirHandlingUnits | 13

Connectingtheoutdoorairintakeinoneoftheways

depictedabovepreventscondensationonthecorner

framework.

4.1.7 - Assembly and placement of the air handling unit

• Ensurethattheoorintheroomwheretheunitis

installedisevenandwaterproof.Thejointsbetweenthe

partsmustbecoveredwiththesealingtapeprovided.

Thesectionscanthenbeplacedinthecorrectorder.

Placethesectionsascloseaspossibletogetherand

ensurethattheycanbemoved.Usingasupport,pull

thesectionstowardseachotherwithapull-rope.

Checkifallpartsarewater-tightandifnecessaryslide

spacersunderthesupportwhererequired(seealso

chapter2).Thenattachtheprolessuppliedtothe

joint.Theroofofunitsinstalledoutsidemustbesealed

sothatnowatercanleaktotheinside.Alwaysattacha

unitinstalledoutsidetotheoorofthesupportframe,

toensurethattheunitcannotmoveorfall(takewind

force into account). For units installed inside please

makesurethattheunitcannotmovefromitssupport

points.Ifnecessary,attachtheunittothesupport.

• Foradetaileddescriptionoftheassemblyplease

refertotheinstructionmanual“Mountinginstructions”.

4.1.8 - Air contamination

Iftheexhaustandoutdoorairintakeopeningsareclose

toeachotherthereisariskofaircontamination.To

reducecontaminationtheairmustberareed.Todo

thiscorrectly,theairvolume,thehorizontalandvertical

distancetothetwoopeningsandthepositionofthetwo

openingsinrelationtoeachothermustbetakeninto

consideration(istheoutdoorairintakelowerorhigher

thantheexhaustairopening).

Itmaybenecessarytopositionthetwoopeningsfurther

apart,usinganextrapieceofductattheoutdoorair

intakeopening.Iftheunitsareinstalledoutside,thispiece

ofductshouldbeplacedbetweentheairhandlingunit

andthepre-installedsuctioncap(ifused).Thepieceof

ducting must always be supported in an appropriate way.

4.1.9 - Condensation in or on the AHU

Condensationcanformontheinsideandoutsideofthe

AHU.Thisdependsontheinstallationlocation(indooror

outdoor),temperatureandrelativehumidityinsideand

outsidetheAHUandthethermalbridgefactor(theTB

value)oftheAHU.AlwaysselectanAHUwithathermal

bridgefactorthatwillnotleadtocondensationatthe

indoor and outdoor conditions. For units installed inside

thefollowingpointsmustbeconsidered:

• Openwatercollectiontanks(e.g.vapour/condensate

collectiontank).Thesemustalwaysbeunpressurised

andcoveredsothattherelativehumidityintheplant

room is minimised.

• Sufcientlyinsulatethecoldwaterandcondensate

linesuptotheAHU.

• Sufcientlyinsulateairductswithapossibleair

temperaturebelowthedewpointoftheairinthe

plant room, as described earlier.

Forunitsthatareinstalledoutside,thefollowingpoints

must be considered:

• Alwaysinsulateairductswithapossibleaircondition

(temperatureandrelativehumidity)withadewpoint

abovetheexpectedoutdooraircondition,toprevent

condensateformationintheduct.Itisrecommended

toinsulateallductsfromandtothebuildingto

minimiseheattransferandtoensuregoodcontrol.

• Afterconnectingtheductstothebuilding

immediatelyconnecttheunittothepowersupply,

switchitonandstartitup.Ifthisisnotdone,

moisturewillmovefromthebuildingductstothe

AHU,causinganincreaseoftherelativehumidityin

theAHU.Atlowoutdoortemperatures(iftheAHUis

notoperating)thiscanleadtocondensationinthe

AHUandatthecontrolpanel.Thismustalwaysbe

prevented.

4.2 - Dampers

4.2.1 – Dampers

Whenworkingondamperregistersitispossibleforyour

ngerstobecometrapped.TheAHUmustbedeenergised

whilecleaningthedamperbladesinordertoprevent

unexpectedclosingofthedampers.Whileconnectingthe

cablingoftheactuator,theAHUmustbedeenergisedin

ordertopreventtheconnectioncablesfrombeinglive.

• Checkiftheactuatormotorisinstalledinaccordance

 withthesupplier’sinstructions.

• Checkifthecorrectanglehasbeenset.

• Checkifthedamperscloseproperly.

• Checkifthedampercanbesettothefullyopen

position.

• Checkoperationanddamperpositionofthespring

return after a power cut. Some dampers must be

open,othersmustbeclosed.

•Ensurethattheendpositionofthedamperisthe

sameastheendpositionoftheactuatorsothatthe

driveleverofthedamperisunloadedintheend

position.

Manual operation Actuator-assisted operation

14 | HHFlexAirHandlingUnits

4.2.2 – Recirculation damper

• Thedampermustalwaysbeclosedduringpower

cutsandwhentheunithasstopped.

• Ifarecirculationdamperisused,thenboththe

outdoorintakeandtheexhaustopeningmustbe

ttedwithadamper.

• Iftherecirculationdamperisusedinamodulating

manner,theauthoritymustbeguaranteeddepending

ontheexternalpressuresontheotheropening.The

authorityoftherecirculationdampercanbeincreased

byplacingaperforatedplateonthedamper.Other-

wise only use open/closed control.

4.3 - Air lters

Filter types:

• Flatlter

• Baglter

• Absolutelter

• Carbonlter

• Chemicallter

• Electrostaticlter

ATTENTION: When carrying out a test run of the AHU the

air intake and exhaust side must never be blocked. The

fastening frame of the lter will fail if the pressure drop

across the lter is excessive.

• Checkifthecorrectltershavebeeninstalled.(air

direction)

• Checkifthelterbagshavebeeninstalledcorrectly.

• Absoluteltersaresuppliedseparatelyinorderto

prevent contamination during transportation and

commissioning.Filtersmayonlybettedafterthe

AHUhasbeencompletelycleaned.

• Setpressureswitchesorsensors,ifused.

• Closetheinspectiondoor.

• Ifdesired,adropleteliminatorcanbettedbehind

theoutdoorairsuctionlter.Thisdropleteliminator

catchesdropletsthatfalloffthelter.Thedroplets

containssubstancesthatareextremelycorrosiveand

cancausecorrosiondamagetothelterfunctionand

functionsafterthelter.Astainlesssteeldriptrayis

mountedunderthelter.

• Checkthatthensofthedropleteliminatorare

straightandsecuredinposition.

• Checktheoperationofthesiphon,see4.5.1.

4.4 - Heaters

4.4.1 - General

• Alwaysusegloveswhilecarryingoutmaintenanceor

repairsontheheaterelementtopreventcuts.

• Alwayswearsafetyglasseswhileworkingonthe

heaterelement.

• Thensandthepipescanreachtemperaturesthat

cancauseburns.Duringmaintenanceworkalways

wearglovesthatprovideprotectionagainsttempera-

tures up to at least 70°C.

• ItisforbiddentodrillholesintheAHUtoprevent

damagetopipesandheater.

• Ifthesystemiscompressiontested,somewatercan

remainintheelement.Thesystemmustcomplywith

thePEDguideline.Compressiontestingistheresponsi-

bilityoftheinstaller.Alwaysde-aeratethesystem.If

thecabinetistemporarilynotinuse,theremaining

water must be removed to prevent freezing.

• Onlyusethemediumforwhichtheelementwas

designed.Ifthemediumconsistsofamixtureof

water/glycoltakeaccountofthefactthatglycolisa

strongoxidisingagent.

• Ifonlywaterisusedasamedium,theelementmust

bedrained,iftheairreachesfreezingpoint.

• Avoidexcessivevibrationcausedbyexternaldevices

andtransmittedthroughthepipes.

• Theunitmustbede-energisedwhenthecollector

angesareremovedfromthepipes.

• Neverexceedthemaximumoperatingpressure.

• Checktheconnectionsonthedimensionaldrawing.

• Ensurethatthecoilhasbeenfullypurged.

• Checkconnectionsforleakage.

• Ensurethatthefrostprotectionthermostathasbeen

correctly connected and set up.

• Thecoilcanbethelastorsecondlastcomponentin

theAHU.Provideaccesstothefrostprotection

thermostatviaaeld-installedinspectionhatchin

thesupplyairduct.

• Ensurethattheheatercansupplyheattoprevent

frostformationwhenthefanisstarted.

CAUTION:Whenthecoilsaredrained,nowatermust

remaininthecircuitstopreventfreezingattemperatures

below zero.

HHFlexAirHandlingUnits | 15

4.4.1.1 - Coils containing glycol

Ifcoilsarelledwithawater/glycolmixture,thisrequires

extraattention.

• Glycolcanreactviolentlywithstrongoxidationsolutions.

• Whenworkingonthecoil,alwayscheckwhich

mediumisused.Beforeaddinganythingtotheheat

exchangemedium,alwayscheckwiththeinstaller.

• Always wear safety glasses and gloves.

• Donotsmokeoruseanopename.

• Whensizingtheexpansiontanktakethehigherheat

transfercoefcientintoaccount(±25%larger).

• Watertightsealsarenotalwaystightforwaterglycol

mixtures.Itisthereforebettertouseweld/solder

connections.

• Water/glycol causes increased sludge formation.

• Alwaysobservetheinstructionsoftheglycol

manufacturer.

• Checkthemixturetoensurethattheglycolconcen-

tration(byweight)iscorrect.

4.4.2 - Electric heater

• Theelectricheatermustbeconnectedasdescribed

inthetechnicaldataandshownintheconnection

diagramsupplied.Itisimportantthattherequired

machinecapacitiescomplywiththethicknessofthe

chosenconnectioncableandfusesofthepowergrid.

Theinstallerisresponsibleforthecorrectconnection

andmachineoperation.

• DonotentertheAHU,iftheelectricheaterisswitched

on.

• Beforeswitchingontheheaterensurethatthefan

rotates.Afterswitchingtheheateroff,thefanmust

continue to rotate for a minimum of 5 minutes.

• Ifnotallthestepsoftheelectricheaterhaveinnitely

variablecontrol,ensurethattheminimumspeed

overtheheateris2m/s.Ifallstepshaveinnitely

variablecontrol,theairspeedovertheelementcan

be reduced to 1.5 m/s.

• Checkand/orconnecttheheaterinaccordancewith

localregulationsandthedatafromthemanufacturer.

• Ensurethattheterminalstripearthandtheinspection

hatchearthhavebeenconnected.

• Checkforpossiblecondensate/moisture.Condensate

mayformintheperiodbeforetherststart-upofthe

AHUasaresultofweatherchangeand/orhumidair

fromthebuilding.Removeallcondensatefromthe

constructioncomponentsanddrytheelectricalcompo-

nentsusingwarm(dry)air(e.g.withadrier).

• Checktheconnectionvoltage.

• Checktheexistingamperageonallphases.Thevalues

mustagreewiththedataontheheaternameplate.

• Toensuresafeoperation,theheaterisequippedwith

athermostatwithautoreset(80°C)andahighlimit

thermostatwithmanualreset(128°C).

• Thewarninglabelforelectricalvoltageisattachedto

theinspectionhatch.

• Theearthwarninglabelisattachedtotheinsideof

theheaterandtheinspectionhatch.

• Thewarninglabelfortheproceduretoswitchoffthe

heaterisfoundonthedoororhatchofthefan

assembly.

! Waarschuwing !

Na het uitzetten van de

elektrische verwarmer moet de

ventilator nog

minimaal 5 minuten draaien.

! Warning !

After switching off the electric

heater the fan must continue to

run for at least

5 minutes.

! Attention !

Après la déconnexion de la

résistance électrique, le ventila-

teur doit continuer à tourner

pendant au moins 5 minutes

! Gefahr !

Nach Abschalten der

Elektroheizung muss der Ventilator

noch mindestens 5 Minuten

weiterlaufen.

200034908

16 | HHFlexAirHandlingUnits

4.4.3 - Steam heaters

ATTENTION:

• Steamheatersconnectedtothepipesmustalways

be compression-tested by trained personnel and

complywiththePEDguideline.Compressiontestingis

theresponsibilityoftheinstaller.Pipesmustalways

beinsulatedandaretheresponsibilityoftheinstaller.

• Theoperationofthesteamheatermustbecon-

nectedtotheoperationofthefan.Ifthefanstops,

stopthesupplytothesteamheaterimmediately.

• Steamheatershavesurfacetemperaturesthat

exceed100°C.Thesteamintakemustbedoneby

expertpersonnelinacontrolledmanner.

• Thesteamheatermayonlybeswitchedonifa

minimumspeciedairquantityisowingoverthe

heater.

• Checkifthereareanyobjectsintheheatingfunction.

Thetemperaturemaybehighenoughforplasticsto

melt.

• Thesteamheatermustbeswitchedoffatleast5

minutesbeforetheAHUisswitchedoff.

• Thefollowingwarningpictogramisappliedtothe

paneloftheAHU:Hotsurface

4.5 - Coolers

4.5.1 - General

• Alwaysusegloveswhilecarryingoutmaintenanceor

repairsonthecoolingelementtopreventcuts.

• Alwayswearsafetyglasseswhileworkingonthe

cooling element.

• Alwayswearglovesduringmaintenancework.

• ItisforbiddentodrillholesintotheAHUinorderto

preventdamagetopipesandthecoolingelement.

• Ifthesystemiscompression-tested,somewatercan

remainintheelement.Thesystemmustcomplywith

thePEDguideline.Compressiontestingistheresponsi-

bilityoftheinstaller.Alwaysde-aeratethesystem.If

thecabinetistemporarilynotinuse,theremaining

water must be removed to prevent freezing.

• Onlyusethemediumforwhichtheelementwas

designed.Ifthemediumisamixtureofwater/glycol

takeaccountofthefactthatglycolisastrongoxidis-

ing agent. Remove any remaining liquid immediately.

• Ifonlywaterisusedasamedium,theelementmust

bedrained,iftheairreachesfreezingpoint.

• Avoidexcessivevibrationcausedbyexternaldevices

andtransmittedthroughthepipes.

• Theunitmustbede-energisedwhenthecollector

angesareremovedfromthepipes.

• Neverexceedthemaximumoperatingpressure.

• Checktheconnectionsonthedimensionaldrawing.

• Ensurethatthecoilhasbeenfullypurged.

• Checkconnectionsforleakage.

CAUTION:Whenthecoilsaredrained,nowatermust

remaininthecircuitstopreventfreezingattemperatures

below zero.

• Ifachangeovercoilissuppliedbyaheatpump,the

installationmustbedesignedtocompensateforthe

requiredheatduringthesystemheatpumpdefrost

cycleandtheheatmustnotbedrawnfromthe

supplyair.Otherwisethesupplyairtemperature

cannotbeachieved.Duringtheheatpumpdefrost

cycleitmustbepossibletoaddenoughheatintothe

systemtoguaranteethedesiredentering

temperature(heaterdesigncapacity)aswellasthe

requiredheatforheatpumpdefrosting.

• EnsurethattheAHUisinstalledhighenoughto

enablethesiphontraptoworkcorrectly.

• Ensurecorrectinstallationofthesiphontrap(option).

UsePTFEtapetomakesurethattheconnectionat

theanglebendofthecondensatepantapis

watertight.Leaveapproximately32mmWITHOUT

tapebetweenthesiphoncasingandtheconnection

tothepipe,asthispartissealedbytherubberring

provided.

• ThenegativepressuresiphonsuppliedbySystemair

B.V. is suitable for a negative pressure of up to 800 Pa

intheassociatedsection.

• Checkifsiphoncoverandballhavebeencorrectly

installed.

• ThegaugepressuresiphonsuppliedbySystemairB.V.

is suitable for a gauge pressure of up to 1200 Pa in

theassociatedsection.

HHFlexAirHandlingUnits | 17

• Checkthatthe(negativeorgauge)pressurecorres-

pondstothesiphontypeinstalled.

• Theoutletofthesiphontrapconnectedtothedrain

must not be under pressure.

• Itisnotrecommendedtoconnectasiphonina

negativepressuresectionandasiphoninagauge

pressuresectionviaamanifoldthatisnotunder

pressuretothedrain.Insteadtwoseparatemanifolds

shouldbeused.

• Iftheeld-preparedsiphonisused,followthe

instructionsinthedrawingbelow.

• Fillsiphonwithwater,ifthefanisswitchedoff.

Negative pressure:

H1 = maximum negative pressure in the cooler section (in mm WG) + 50 mm.

H2 = >1/2 x H1

Gauge pressure:

H1 = >maximum gauge pressure in the cooler section (in mm WG) + 50 mm.

H2 = 50 mm

Pressure in kPa (100 Pa = 10 mm WG)

• Checkifthedropleteliminatorafterthecoolerhas

been correctly installed.

• Checkifnshavebeenbentduringtransport.

• Correctlystraightenthens.

• Thenswillonlyworkcorrectlyafterseveraldaysin

dehumidicationmode.

• Startupthecoolingcoilbyopeningtheshut-off

valvesandswitchingonthecontroller.Afterseveral

daysofcoolingoperationcheckthecondensatedrain

andoperationoftheplasticsiphon.

• Ifnecessarycleanthesiphon.

4.5.2 - Glycol in elements, see 4.4.1.1

4.5.3 - DX-coils

• TheDX-coilsaresuppliedwithoutrefrigerant.

• Thecoilsmustneverbepressurisedwithwater.They

mustbesealedandpressurisedwithagaseous

mediumtopreventpollutionofthecoil.

• Aqualiedpersonshouldchargethecoilandtherest

ofthesystemwithasufcientamountofthe

refrigerantasspeciedinthetechnicalspecications.

• WhenconnectingtheDX-coiltothecompressor/

condensingunitalwaysfollowthesupplierspecica-

tionsandtheinstructionsofthequaliedpersonnel.

• ItisnotrecommendedtoconnectseveralDX-coilsto

one compressor/condensing unit.

• Itisbesttouseaninnitelyvariablecontrollerforthe

compressor/condensingunit.Ifthecondensingunit

hasinnitelyvariablecontrol,oneofthetemperature

controlsinthecontrollercanbeselected.

• Ifthecondensingunitdoesnothaveinnitelyvariable

control,settheAHUcontrolforsupplyairtemperature

controlandconnecttheDXenteringtemperature

sensorinsteadofthesupplyairsensor.Thedesired

(room)temperaturemustthenbecontrolledbya

separatecontrolleratthecondensingunit.

Ifachangeovercoilissuppliedbyaheatpump,the

installationmustbedesignedtocompensateforthe

requiredheatduringthesystemheatpumpdefrostcycle

andtheheatmustnotbedrawnfromthesupplyair.

Otherwisethesupplyairtemperaturecannotbeachieved.

Duringtheheatpumpdefrostcycleitmustbepossibleto

addenoughheatintothesystemtoguaranteethedesired

enteringtemperature(heaterdesigncapacity)aswellas

therequiredheatforheatpumpdefrosting.

4.6 - Heat recovery wheel

• Ensurethattheheatexchangerfaceareaisnot

damaged.

• Checkthatthewheelisrotatinginthecorrect

direction.Thisisindicatedbyanarrowonthecasing.

• Checkifthewheelsealsarettingcorrectly.

• Checkifthebelttensioniscorrect.

18 | HHFlexAirHandlingUnits

• Checkifthemotorandtherotationmonitorhave

been correctly connected (5 mm play between

sensoranddetectionpointonthewheel).

• Checkifthecontrollerhasbeencorrectlyconnected

andsetinaccordancewiththesupplierinstructions.

Theinstructionsfromthecontrollersupplierapply.

• Ensurethattherotorspeedhasbeencorrectlyset

TheHHFlexcondensationrotormusthavea

maximumspeedof10min

-1

; a sorption rotor must

haveamaximumspeedof20min

-1

.Refertothe

usermanualfortheheatrecoverywheelcontroller.

• Iftheairintaketemperatureisbelow-15°C,a

pre-heaterisrecommendedfortheheatrecovery

wheeltopreventfreezing.

• Thefollowingwarningsignisshownonthepanel.

Rotating parts

Rotor controller

Iftheheatrecoveywheelissuppliedwitharotor

controller,thismustbeincludedinthecentralcontrol

panel.Therotationsensoroftherotorispre-ttedand

must be connected.

Ifitisnecessarytoprotecttheheatrecoverywheel

againstfrostdamage,itmustbettedwithapressure

sensororpulse/pausemustbeactivatedortheairsupply

volume must be reduced.

4.7 - Plate heat exchanger

• Ensurethatthefaceareaoftheheatexchangeris

not damaged.

• Ifdampersareinstalled,alsocheckiftheactuator

motorhasbeeninstalledinaccordancewiththe

supplier instructions.

• Checkifthecorrectanglehasbeenset.

• Checkifthedampersclosecorrectly.

• Checkifthedamperscanreachthefullyopen

position.

• Beforeconnectingthesiphontrapandcheckingthe

dropleteliminator(ifinstalled),seechapter4.5.

• Iftheairintaketemperatureinacross-owplate

heatexchangerisbelow-10°C,apre-heateris

recommendedfortheplateheatexchangerto

prevent freezing.

• Iftheairintaketemperatureinacounter-owplateheat

exchangerisbelow-5°C,apre-heaterisrecom-

mendedfortheplateheatexchangertoprevent

freezing.

Ifdesired/necessary,theheatrecoverywheelistted

withasensortoprotecttheheatexchangeragainst

freezing.Ifdampersarepresent,thecontrolsystem

mustopenandclosethedampersatthecorrecttimeto

preventfreezingoftheplateheatexchanger.

4.8 - Direct steam humidication

4.8.1 - General

• Firstreadthedocumentationsupplied.

• Connectthesteamgeneratorinaccordancewiththe

documentation supplied.

• Wearing safety gloves and glasses is compulsory.

• Do not enter an active steam generator. Entry is only

allowedifthesteamgeneratorhasbeeninactivefor

10minutes.Whenenteringthesteamsectionand

touchingthesteamgenerator,distributionpipeorpipes

makesurethattheunitisnolongerproducingsteam.

• Enteringthesteamfunctionandtouchingthesteam

generator, distribution pipe and pipes can cause

burns.Thesurfacetemperatureofthesteam

generator,distributionpipeandpipesandthesteam

canreach100°Cormore.

• Steamgeneratorsthatareconnectedtothepipes

mustalwaysbecompressiontestedbysufciently

trainedpersonnelandcomplywiththePEDguideline.

Compressiontestingistheresponsibilityoftheinstaller.

Alwaysde-aeratethesystem.Pipesmustalwaysbe

insulatedandaretheresponsibilityoftheinstaller.

• Consultthedocumentationsuppliedinthecaseof

faultsinthesystem.

• Theoperationofthesteamgeneratormustbelinked

totheoperationofthefan.Ifthefanisde-activated,

supplytothesteamgeneratormustbestopped.

• Foralltypesofhumidiersamaximumhygrostat

must be installed to allow intervention in case of

excessivehumidication.

4.8.2 - Direct steam humidication

• Checkthefasteningofthesteamcontainer.

• Checkthesteamsupplyandthecondensateexhaust.

• Forlongerpipestanextracondensatecontainer

boilerinaccordancewiththesupplier’sinstructions.

• Checkthatthedirtcollectorhasbeeninstalled.

• Condensatedrainagemaybeexecutedwithout

pressure,dependingonthemanufacturer.Referto

thesupplier’sinstructions.

• Incaseofunder-pressureintheAHU,placeaspecial

siphonforcondensatedrainage.

• Tocommissionthesteamhumidier,thesteammust

beintroducedintothesystemandthehumidier

mustslowlybebroughttotheoperatingtemperature.

Whenthecondensatepipehasreachedtheoperating

temperature,switchontheadjustmentmotorelectri-

callyorpneumaticallyandsetthedesiredhumidity

level.Refertothesupplier’sinstructions.

HHFlexAirHandlingUnits | 19

• Cleanthedirtcollectorsieveandcheckthecondensate

exhaustseveraldaysaftercommissioningtheunit.In

caseofcabinetswithunder-pressure,theoperation

oftheunder-pressuresiphonmustbecheckedwith

a non-return valve.

• Amaximumhygrostatmustbettedinordertoprevent

excessivehumidicationintheAHU.See4.8.1.

• Theconnectionofthesteampipetothepipemust

betension-freeinordertopreventdistortionofthe

steam pipe and generator.

• ThefollowingwarningstickerIappliedtothepanel.

Hot surface.

4.9 – Electric steam humidier

4.9.1 - General - see 4.8.1

• Theelectrichumidiermustbeconnectedbasedon

thetechnicaldataandthesuppliedconnection

diagram.Itisimportantthattherequiredcapacities

ofthemachinecorrespondwiththethicknessofthe

chosenconnectioncableandthefusesonthe

electricitygrid.Theinstallerisresponsibleforthe

connectionandgoodoperationofthedevice.

4.9.2 – Electric steam humidier

• Checkthefasteningofthesteamgenerator.

• Checkthesteamsupplyandcondensatedrainage

pipes.

• Condensatedrainagemaybeexecutedwithout

pressure,dependingonthemanufacturer.Referto

thesupplier’sinstructions.

• Incaseofunder-pressureintheAHU,installaspecial

siphonforcondensatedrainage.

• Checkthevoltageandmeasurethetotalpower

consumption.

• Connectthehumidierinaccordancewiththe

supplier’sinstructions.

• Thefollowingwarningstickerisappliedtothepanel:

Hot surface.

• Amaximumhygrostatmustbettedinorderto

preventexcessivehumidicationintheAHU.See

4.8.1.

4.10 - Water humidiers

4.10.1 - General

• Bacteria may grow in open water. Ensure correct

maintenancetopreventLegionaire’sDisease.

• Theconnectionofthereplenishmentwaterandthe

drainageofthecondensatewatermustcomplywith

local regulations.

• Thecirculationpumpofthehumidiercanonlybe

startedwhenthefanisinoperation.Itwillnot

functionorfunctioninsufcientlywithoutanairow,

therebycausingotherpartsofthecabinettobecome

wet.Startthehumidicationpumpandcheckthe

directionofrotationinaccordancewiththearrow

shown.Watermustbeemittedfromthesprayers

immediatelyafterthepumpisstarted.Stop

immediatelyifnecessary.Thecirculationpumphas

water-lubricatedbearingsandawaterlubricatedaxle

seal,ttedwithtwohardmetalrings.

• Incaseofdangeroffreezing,alwayscheckthatthe

heaterfunctionscorrectly.

• Theoperationofthewaterhumidiermustbelinkedto

theoperationofthefan.Ifthefanstops,thesupplyto

thewaterhumidiermustalsobestoppedimmediately.

• Amaximumhygrostatmustbettedtoprevent

excessivehumidicationintheAHU.See4.8.1.

4.10.2 - Spray humidier

• Inordertomeasurethequantityofspraywater,the

siphonmustbedisconnectedandthequantityof

watermustbemeasuredonsitewiththeaidofa

measuringjugandastopwatch.Immediately

determinetherequiredquantityofspraywaterfor

everycabinetinadvance.Checkthattheoatsealin

thewaterreservoirissettothecorrectheight.

4.10.3 - Determining the quantity of spray water and

the condensation factor

• Theconstantevaporationofwaterincreasesthesalt

concentrationandtherebytheconcentrationofother

constituentsinthereservoir.Whentheairishumidied

aportionofthewaterevaporates,whiletheremaining

waterreturnstothereservoir.Saltsandotherundis-

solvedsubstancesthatarealwayspresentinpipe

waterorsoftenedwaterremaininthewaterthat

returnsintothewaterreservoir,whiletheevaporated

portion does not contain any solids.

• Evaporationlowersthelevelinthereservoir.Thisis

preventedbytheautomaticadditionoffreshwater

throughtheoatseal.However,thiscontainsmore

saltsandothersolidsandbecomesincreasingly

concentratedinthereservoir.Thisisdescribedbythe

term‘thickening’.Constantlysprayingacertain

amountofwatercanlimittheconcentrationinthe

container.Thislimitcanbecontrolledbydetermining

thequantityofspraywaterrequired.

20 | HHFlexAirHandlingUnits

• Determinethespraywateramountwithaknown

maximumofwatertobeevaporatedandaselected

thickeningfactor.

Qs = qv  qt=qv+qs

i-1

where:

i = thickening factor (see below)

qt = supply water amount

qv = quantity of water to be evaporated

qs = spray water amount

The pH value of the spray water must not be lower than 5

or higher than 10.

• Selectionofthethickeningfactor(andthereforethe

spraywateramount)isimportant.Ifthefactorchosenis

toolow,thewaterconsumptioncostwillbeunneces-

sarilyhigh.Ifthefactoristoohigh,extremescaling

andcontaminationofthewetpartsofthehumidier

willoccurandleadtohighmaintenancecosts.

• Amaximumhygrostatmustbettedtoprevent

excessivehumidicationintheAHU.See4.8.1.

4.10.4 - Infrasonic humidication

• Carefullyreadthesupplier’sinstructions.The

followingpointsdeserveextraattention.

• Ensurethattheconnectionvoltagecorrespondsto

theunitvoltage.

• Connecttheunitinaccordancewiththediagram

supplied.

• Checkthecorrectconnectionofthedrain.

• Checktheconnectionofthehigh-pressurehose.

Aftercommissioning,checkthatthehosesdonot

rub against any surface.

• Checkthatthesprayersproduceaneffectivemist.

Checkoperationofthepressostatsandpressure.

• Checkthewaterquality.

• Thehumidiermustbettedwithasafetyfeatureto

preventoverheatingandrunningdry.

• Theairowoverthehumidiermustnotexceed5.5

m/s.Optimumoperationisat4m/s.Theonly

humidica-tionmediumthatmaybeusedis

demineralisedwater,withaconductivityupto20

microsiemens/cm and an ambient temperature

between+2°Cand+30°C.

• Ensurethattheairowgraduallydecreasesforanother

20minutesafterde-activationofthehumidication

pumptoallowtheAHUtodrycompletelyandprevent

microbiological contamination.

• After50operatinghours,theoilinthepumpmust

bereplaced.Werecommendthatyouusesynthetic

oil SAE 20W50.

• Amaximumhygrostatmustbettedtoprevent

excessivehumidicationintheAHU.See4.8.1.

• Thefollowingstickerisappliedtothecontrolbox.

4.11 - Fan

CAUTION:Theairowmaycausestationarypartstomove

(evenafanthatisswitchedoff)!

• Removethetransportbrackets.Thisisindicatedbya

labelonthedoor.

• Checkifthefancanmovefreelywithoutobstructing

theframe,exibleconnectionorwiring.

• Checkforpossiblecondensate/moisture.Condensate

mayformbeforetheAHUrststart-updueto

changingweatherand/orhumidairfromthebuilding.

Removeallcondensatefromtheconstruction

componentsanddrytheelectricalcomponentsusing

warm(dry)air(e.g.withadrier).Thisappliestoboth

motor and frequency converter.

• Checktheconnectionvoltage.

• Checkand/orconnectthemotorinaccordancewith

localinstructionsandthedataofthesupplier.

• Checkthedirectionofrotationoftheimpeller.The

directionisindicatedonthefanbyanarrow.

• Separatelymeasurethecurrentdrawoftheelectric

motorforallphases.Thecurrentdrawofallphases

mustbeapproximatelythesameandagreewiththe

dataonthenameplate.Setthemotorprotection

devicetothenominalvalue.

• Themotordatashownisforanaltitudeofupto

1000 m above sea level and an ambient temperature

of40°Cmaximum.

• Thedataforbelttype,belttension,numberofbelts,

pulleysizeandtypeisgivenonastickeronthefan

housing.

• Ifthefansareshutdownforlongerperiods(longer

thanthreemonths),thebearingsmaybedamaged.

Topreventthis,itisrecommendedtoreducethefan

Remove after

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SystemAir HHFlex Installation, Operation And Maintenance Instructions

Brand: SystemAir

Model: HHFlex

Category: Split-system air conditioners

Type: Installation, Operation And Maintenance Instructions

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SystemAir HHFlex Installation, Operation And Maintenance Instructions

SystemAir HHFlex Installation, Operation And Maintenance Instructions

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