Seresco NE Series User manual

OPERATION AND
MAINTENANCE MANUAL
NE-002 to NE-016
NE-204 to NE-232
COMPACT Indoor Model
NE SERIES
DEHUMIDIFIERS
serescodehumidifiers.com

B–TableofContent
OMM.B.S.SL.01 B‐ 1 February 2020 
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TableofContent
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ChapterC‐GeneralInformation C–1

OperatingSafety C–1

ReferenceandAdditionalInformation C–2
o
ContactUs C–2

BasicInformation C–3
oDehumidifierViewandOptions
C–3
o
DehumidifierExternalSystemsConnection C–4
oDehumidifierOptionalArrangement
C–5
oAirConditioningOptions–OutdoorAirCondensersandFluidCoolers
C–5
o
EquipmentSpecificData C–8
ChapterD‐LayoutandComponents D–1

DehumidifierMainComponents D–1

ControlSystem D–2
OutdoorAirCondensersandFluidCoolersLayoutandComponents
D–4
ChapterE‐SequenceofOperation E–1

SetPoints E–1

Ventilation E–1

AirConditioning,DehumidificationandPoolHeating E–1
o
Compressor(s) E–1
SpaceHeating
E–3
ChapterF‐InterfaceandCommunication F–1
TouchDisplayOperatorPanel
F–1
oAlarms
F–2
RemoteCommunication
F–3
ChapterK–R3Module
 K‐1
BasicInformation
K–1
oR3ModuleViewandOptions
K–1
R3ModuleExternalSysyemsConnection
K–2
R3ModuleLayoutandComponents
K–2
DehumidifierwithR3Module–SequenceofOperation
K–3
ChapterM‐BasicMaintenanceM–1

MaintenanceandSafety M–1

MaintenanceKeyPoints M–1

RoutineMaintenanceProgram M–2

SpecificComponentsMaintenance M–3
ChapterW‐Warranty W–1
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B–TableofContent
B‐
2 
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Thispageisleftblank
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C–GeneralInformation
OMM.C.S.SL.01 C‐ 1 February 2020 
GeneralInformation
ThismanualprovidesbasicinformationabouttheapplicableSerescodehumidifieranditsoperation.
Importantinformationregardinginstallation,maintenance,andstartupaswellasadditionalandauxiliarysystems
anddevices(outdoorcondenser,communicationinterfaces,etc.)isnormallyprovidedwiththedehumidifierand
canalsobeobtainedfromthemanufacturer(seeContactUsbelow).
OperatingSafety(Warnings,Cautions,andNotes)
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FORYOURSAFETY:READBEFOREPERFORMINGANYOPERATIONS,MAINTENANCEORSERVICETASKS!
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Onlyqualifiedtechniciansshouldinstall,operate,maintainorservicemechanicalequipment
includingcurrentdehumidificationsystem.
Makesuretoreadthismanualbeforeperforminganytaskstofamiliarizeyourselfwiththe
equipmentaswellaswithanypotentialhazards.Alwaysexercisecaution!

Bewareofelectricalpowerandhighelectricalvoltage!
• Followpropersafetyprocedures–lockout,tagout,andotherrespectiveprocedures
• Failuretofollowsafetyprocedurescanresultinseriousinjuryordeath

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Bewareofmovingpartsandhotsurfaces! 
• Makesuretostopallmovingparts(fans,blowers,etc.)beforeaccessingtheequipment’s
internalspace
• Beawareofhotsurfaces(hotrefrigeration,spaceheatingpipes,coils,heaters,etc.)
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Bewareofhighpressuresandchemicals! 
• Dehumidifiers,equippedwithcompressors,containrefrigerantunderhighpressure;oilis
alsocontainedinthecompressorandrefrigerationcircuit(s)
• Somedehumidifiersmayalsocontainotherliquidssuchasglycolmixturesandpoolwater
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Thefollowingwarnings,cautions,andnotesappearthroughoutthismanualandreferenceddocumentation
wheneverspecialcaremustbetakentoavoidpotentialhazardsthatcouldresultinequipmentmalfunctionor
damage,personalinjury,ordeath.
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
WARNING 
Indicatesapotentiallyhazardous
situationwhichcouldresultin
seriousinjuryordeathifhandled
improperly.
CAUTION 
Indicatesapotentiallyhazardous
situationwhichcouldresultin
moderateinjuryorequipment
damageifhandledimproperly.

Note
Indicatesasituationthatcould
resultinequipmentdamageor
improper/ineffectiveoperationif
handledimproperly.

C–GeneralInformation
C‐
2 
ReferenceandAdditionalInformation

Forsafe,efficientandproblem‐freeoperation,itiscriticaltohandlethedehumidifier(aswellasrelatedsystems
andcomponents)properlyateachstep‐fromreceivingandstoragetoinstallationandstartup.Relevant
informationcanbefoundintherespectivedocuments(likeInstallationManual)providedwiththedehumidifier.
Thismanualandotherrelateddocumentscouldbeobtainedfromthemanufacturer(seeContactUsbelow).
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ContactUs
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
Seresco 
1071AgesDrive
Ottawa,ONK1G6L3
Canada
http://serescodehumidifiers.com
Forimmediateassistance:1‐833‐DAS‐POOL(327‐7665)

Start‐upRequests:Start‐[email protected]
MiscellaneousInquiries:[email protected]
PartsRequests: [e-mail]
Warranty: [e-mail]
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Attention:InstallationandServiceContractors 
WARNING! Anywork(installation,startup,service,maintenance,repair,etc.)onanymechanical
equipment(dehumidifier,outdoorcondenser,fluidcooler,etc.)mustbeperformedinaccordancewith
respectivemanufacturer’srecommendationsaswellassubmittaldocumentation,localCodesandRegulations,
andappropriatefieldpractices.Failuretodosocouldresultinpersonalinjury,equipmentdamageor
malfunction,andwillvoidequipmentwarranty.Onlyqualifiedandproperlytrainedindividualsshouldperform
tasksonthisequipment.
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Attention:MaintenanceTeam
CAUTION. Toensureequipmentlongevityandproperandefficientoperation,thedehumidifierandits
auxiliarysystemsanddevices(outdoorcondenser,fluidcooler,boilerpackage,etc.)shouldbemaintained
properlyandregularly.Failuretodosocouldnegativelyaffectpremisecomfortlevelsandpeople’shealth.It
couldalsoleadtoequipmentdamage,malfunction,prematuretearandwareandmayvoidequipmentwarranty.

C–GeneralInformation
OMM.C.S.SL.01 C‐ 3 February 2020 
BasicInformation
DehumidifierViewandOptions
StandardNE002–NE003dehumidifier’sgeneralviewandoptions*areshownonPic.C.1.
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DehumidifierOptions:
Indoor,single‐compressordehumidifiers,2to16toncoolingcapacity(apprx.)‐modelsNE002toNE016*.
oTwo‐compressordehumidifieroption(seeDehumidifierOptionalArrangementbelowfordetails):
4to32toncoolingcapacity(appx.)‐modelsNE204toNE232;
Airflowandductworkconnectionoptions*(Return,SupplyandOutdoorAir)‐seePic.C.1.
OptionalPoolWaterHeating**.
OptionalSpaceHeating‐hotwatercoil,electricorgasheater***.
AirConditioning(AC)*–externalwatercooling,outdoorcondenserorfluidcooler.
Pic.C.1
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Options:

ReturnAir(RA)ductworkconnection‐
horizontal.
SupplyAir(SA)ductworkconnection
options–top,bottom,horizontal*.
OutdoorAir(OA)intake‐horizontal*.
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PipingConnections
① CondensateDrain
② AC–Air‐Cooled(refrigeration)
③ AC–Water‐Cooled(water/glycol)
④ PoolHeatingWater
⑤ SpaceHeatingHotWater
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C–GeneralInformation
C‐
4 
* Allavailableoptions(tonnage,ductworkconnections,ACoptionsetc.)areshown.Refertothesubmittal
andotherrelevantdocumentationforyourequipmentoptions,dimensionsetc.
**Thepoolwaterheatingoptionreliesoncompressor‐createdexcessheatandisusedasanadditional
heatingsource.Itdoesnoteliminatetheneedforamainpoolwaterheater.
***Forspecificdetailsonspaceheating(hotwater,gas,electric)option,refertothesubmittalandother
documentation:
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Gas‐firedductheatercanbeincorporatedwiththedehumidifier(installedonthetopofit)forsomemodels(NE004to
NE007only);thisconfigurationlimitstheRAandSAoptionstoa“loop‐back”arrangement.Forothermodels,asimilar
gasheatercanbeprovidedforfieldinstallation(tobefittedinthesupplyairductwork).
Electricheater,dependingonvariousfactors(capacity,model,size,etc.),canbeinstalledexternally(mountedonthe
topofSAopening)orinternally.Refertoyourdehumidifier’ssubmittaldocumentation.
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DehumidifierExternalSystemsConnection 
Pic.C.1showsprovisionsforexternalsystemsconnections,includingductwork,electricpowerandcontrolwires
andvariouspipingconnections.
Exceptforthecondensate,allotherpipingsystemsareoptionalandmaynotbepresentineachdehumidifier.
AirConditioning(AC)Connection.Normally,thedehumidifierhasonlyoneACoption–air‐cooled(requiring
connectiontotheoutdooraircondenser)orwater‐cooled(requiringconnectiontothefluidcoolerorother
externalwater‐cooledsystemsuchasgeothermal,coolingtower,etc.).Therefore,onlyoneoftheseoptions
presentwiththeactualdehumidifier.
Gasline.Ifthedehumidifierisequippedwithagasheater(boiler,gasfurnaceetc.)forspaceheating
purposes,thegaslineconnectionistobebroughttothegasheaterdirectly.
NOTE. DehumidifierMUSTbeequippedwithaP‐trapatthecondensateconnectionforproperoperation!If
dehumidifierisrequested/providedfromthefactorywithoutP‐trap,oneMUSTbeinstalledonsitepriorto
dehumidifierbeingcommissioned.RefertothedehumidifierstickersandInstallationManualfordetails.
CAUTION! Currentmanualshowsgeneral/defaultconnections’location.Fordetailsregardingspecific
dehumidifier’sconnections(actuallocation,pipingsizesandpositiondimensions,circuittypeandflowdirection
etc.),refertothedehumidifier’ssubmittaldocumentationaswellasdehumidifier’slabelsandstickers.
WARNING! GasLine.Thegaslinemustbeinstalledinaccordancewithrespectivedevicedocumentation
(boiler,furnace,etc.)andlocalcodesandregulations.
Attention!EquipmentClearancesandDimensions!
CAUTION! Forequipmentproperoperation,maintenanceandservice,respectiveclearancesshouldbe
maintained.Generally,30”clearancestotheequipmentmustbekeptforthemaintenanceandservicepurposes.
Forthespecificrequiredclearancesinformation,aswellasdehumidifieroveralldimensions,distancestopipe
connections,ductconnectionsetc.,refertothesubmittaldocumentation.
Attention:R3Module 
Note: IfthedehumidifierisequippedwiththeR3Module(seeyourequipmentsubmittaldocumentation),refer
totheR3Modulechapterinthismanualforadditionalinformationaboutmoduleoptions,layout,andoperation.

C–GeneralInformation
OMM.C.S.SL.01 C‐ 5 February 2020 

DehumidifierOptionalArrangement.

Two‐CompressorArrangement
StandardNEseriesdehumidifierhasonecompressor,however
two‐compressorarrangementisavailablealso.Note,thatall
optionsanddetails,providedabove,applytoboth,standardand
two‐compressorarrangement:
“Double‐Decker”dehumidifierisshownonPic.C.3.Itis
composedoftwoidenticaldehumidifiers,oneinstalledon
topofanotherandcontrolledasasingledehumidifier
(eachdeckisequippedwithonecompressor/refrigeration
circuit).


SingleandTwo‐CompressorArrangement–DehumidifierModel
Dehumidifiertypicalarrangement,totalcapacity,andnumberofcompressorsarereflectedinitsmodel(for
specificdehumidifiermodelrefertoitsMainLabel–seeSpecificDataInfobelow),asillustratedinexamples
below:
NE002–single‐decksingle‐compressordehumidifier.

Two‐compressorNEseriesdehumidifier:
NE204‐double‐decktwo‐compressordehumidifier(composedoftwoidenticaldehumidifiersNE002).
Mostoften,“Double‐Decker”comesastwohorizontaldehumidifiers,one“stacked”onthetopofanother,
howeveritcouldalsobecomposedoftwodehumidifiers(horizontalORvertical)installedsidebysideor
separately,stillbeingcontrolledasone.
AirConditioningOptions‐OutdoorAirCondensers(OACC)andFluidCoolers(OAFC).
BasicviewsofstandardairconditioningoptionsareshownbelowonPic.C.4‐A(condensers,NCmodels)andPic.
C.4‐B(coolers,NGmodels);standardcombinationsofthedehumidifierandrespectiveairconditioningoption
(basedontheircapacities)areshowninTableC.1.
*TableC.1showsstandarddehumidifierand
condenser/coolercombination;dependingonnumberof
factors,dehumidifiermayhavedifferent
condenser/coolerprovidedwithit‐refertothe
dehumidifier’ssubmittaldocumentationformore
details.
**Two‐compressordehumidifierwouldnormally
havepaired‐uptwooutdoorcondensersofrespective
size(onepercompressor).
***Thepumppackageisoptional‐thefluidcooler
maybeprovidedwithoutit.
TableC.1.Dehumidifier‐ACCombination*
Dehumidifier–OutdoorCondenser**Fig.#
NE002–NE004NC‐B1
NE005–NE008NC‐Z‐12
NE010–NE016NC‐Z‐23
Dehumidifier–FluidCooler***Fig.#
NE002–NE003NG‐Z‐14
NE004–NE007,NE204–NE214NG‐V‐05
NE008–NE012,NE208–NE212NG‐V‐116
NE014–NE016,NE214‐NE224NG‐V‐127
NE228–NE232NG‐V‐228
Pic.C.3

C–GeneralInformation
C‐
6 





Attention!EquipmentClearances!
Properclearancesshouldbemaintainedforadequateairflowandheatrejection!Generally,upto36”sideand
96”topclearancesarerequired.Formoreinformationonclearancesaswellasequipmentdimensionsandother
details
,
refertothesubmittaldocumentation.
Pic.C.4‐A

C–GeneralInformation
OMM.C.S.SL.01 C‐ 7 February 2020 


Pic.C.4‐B

C–GeneralInformation
C‐
8 
EquipmentSpecificData
Specificinformationforindividualdehumidifiersis
providedinthefollowingmethods:
 

MainLabel(Pic.C.5):themanufacturertagattached
tothefrontofthedehumidifierincludesthe
dehumidifier’smostcriticaldata:
Generaldataincluding:
oSerialnumber
oDehumidifiermodel(nomenclature)
oDesignroomconditions(airtemperature
andhumidity)
Operationaldata,including:
oRefrigeration(refrigeranttype,charge,
etc.)
oElectrical/airflow(dehumidifiervoltage,
CFM,etc.)
oOtherapplicabledata(poolheating,
space/auxiliaryheatingfeatures,etc.)

LabelsandStickers:attachedwhenapplicabletothe
exteriorandinteriorofthedehumidifiertoshow:
Externalsystemsconnectionslocation/direction
(pool/spaceheating,coolingcircuits,condensate)
Airfilterlocations,quantity,andsize.
AdditionalInfo(warning,cautionstickers,etc.)

WiringDiagrams:attachedtotheinteriorsideofthe
dehumidifier,depictdehumidifiercontrolandpower
wiring.

Remotelyinstalledcondenserorcoolerwouldhaveitsspecificinformationprovidedinsimilarmanner(labelsetc.).








Attention!GlycolCircuits.
Unlessotherwiseindicated,equipmentfluidcircuits(exceptforrefrigerationandpoolwatercircuits)suchasheat
recoveryloop,compressorglycolloop,boilerpackage,fluidcooleretc.,arenormallyfilled/tobefilledwith
water/glycolmixture;normally,rustinhibitor‐infusedfood‐gradepropyleneglycolisused.
GlycolmixtureconcentrationisnormallyshownonMainLabel–referasneeded.

Note: Themainlabelshownaboveisjustanexample.
Pic.C.5

D–LayoutandComponents
OMM.D.S.SL.01 D‐ 1 June 2020 
LayoutandComponents

Thegenerallayoutandcomponentslocationisthesameforalldehumidifiersofcurrenttype,howeversomemay
vary,basedonthedehumidifier’sspecificoptions–refertosubmittaldocumentation.Pic.D.1belowshows
all/mostavailableoptions,someofwhichmaynotbepresentonyourdehumidifier.
DehumidifierMainComponents


21
3
5
4
78
9
11
10
13
14
15
18
17
16
Pic.D.1
Attention:R3Module 
Note: IfthedehumidifierisequippedwiththeR3Module(seeyourequipmentsubmittaldocumentation),refer
totheR3Modulechapterinthismanualforadditionalinformationaboutmoduleoptions,layout,andoperation.

D–LayoutandComponents
D‐
2 
MainBlower(1)isinthemainblowercompartmentnexttotheMainElectricPanel(2)andCompressor
Compartment(3).
MinOutdoorAir(OA)Opening(4)isoptionallyequippedwithamotorizeddamperandfilter(s).TheManual
OADamper(5)isusuallyusedtosetproperamountofoutdoorairintake.
Refrigerationcoils‐Evaporator(7)andReheat(internalcondenser)(8)‐arelocateddirectlydownstreamof
theMainFilterRack(9).
oEvaporatorBypassDamper(10)islocatednexttotheevaporatorcoil.Ithelpstocontrolcompressor
suctionpressurebyadjustingtheamountofair,bypassingtheevaporator.
Spaceheater(11)location,ifthedehumidifierisequippedwithone,mayvary:
oHotwatercoilisusuallylocateddirectlydownstreamofthereheatcoil;
oElectricheatermaybeinthesameplaceasthehotwatercoilormounteddirectlyonthe
dehumidifier’ssupplyairductconnection.
oGasheater(ductheaterorboilerpackage)normallyisinstalledexternally,howeversomemodels
couldhaveductgasheatermountedonthetopofthedehumidifier.
Compressor(13),Receiver(14)andothercomponentsarelocatedwithintheCompressorCompartment(3).
oIfthedehumidifierhasthestandardpoolwaterheatingoption,thecompressorcircuitincludesthe
coaxialpoolwaterheatexchanger(15)andrefrigerationpoolvalve.
oIfthedehumidifierhasthewater‐cooledairconditioningoption(equippedwithfluidcooleror
connectedtoexternalwater‐coolingsource),thecompressorcircuitalsoincludestheplateheat
exchanger(16)).
MainElectricPanelcontainsMainControlBoard(17),OperatorPanel(18)andotherelectricalcomponents.

ControlSystem
Thedehumidifiercontrolsystemiscomposedofsensors,spreadthroughoutthedehumidifier,MainControl
Board,OperatorPanelandotherelectriccomponents,locatedintheMainElectricPanel.
TemperatureSensors(Pic.D.2):
a) Temperaturesensors(thermistors)areusedtomonitor
varioustemperatures(air,water,compressor,etc.);
b) Combosensorisusedtomonitorairtemperatureand
humidity.





 Compressoroperationismonitoredwithpressuresensors(Pic.D.3):
c) PressureTransducers(asmainoperationalcontrolandsafety)and
d) PressureSwitches(fast‐reactingbackupsafety). 


SensorsandsafetiesapproximatelocationisshownonPic.D.4.
b
a
c
d
Pic.D.3
Pic.D.2

D–LayoutandComponents
OMM.D.S.SL.01 D‐ 3 June 2020 

















RAComboSensor(21)measurestemperatureandhumidityofthepoolroomair(ReturnAir)enteringthe
dehumidifier.Itislocatedatthemainfilterrack.
OATemperatureSensor(22)measuresoutdoorairtemperature;it’slocatedattheOAfilterrack.
oAsanoption,thecombosensor(insteadofregularthermistor)canbeinstalledattheOAintaketo
measureboththetemperatureandhumidityoftheoutdoorair.
ET(EvapT)TemperatureSensor(23)measuresthetemperatureofairleavingevaporatorcoil.It’slocated
directlydownstreamoftheevaporator.
SAtemperaturesensor(24)measuresthetemperatureoftheairleavingthedehumidifier(suppliedtothe
premise).Itmustbelocateddownstreamofthespaceheater:
oInsomecases,wherethespaceheaterisexternaltodehumidifier,thesensorwillbeprovidedwith
thedehumidifiertobefield‐mountedintothesupplyairductworkdownstreamofthespaceheater.
Ifthedehumidifierisequippedwiththepoolheatingoption,thePoolWaterTemperaturesensors(PoolIn
(25)andPoolOut(26))measuretheenteringandleavingpoolwatertemperature.Thesensorsarelocated
directlyattherespectiveconnectionsofthecoaxialpoolwaterheatexchanger.
oAsanoption,thepoolwaterheatexchangerpiping/manifoldmayhavewaterflowswitchalso.
Thecompressor’sdischargeline(highpressureside)isequippedwithTemperatureandPressuresensorsset‐
DischargeTemperatureSensor,HighPressureTransducerandHighPressureSwitch(27)‐toprotectthe
compressorandcontrolitsoperation.AsimilarfunctionisperformedbySuctionTemperature,LowPressure
TransducerandSwitch(28)locatedatcompressor’ssuctionline(lowpressureside).
 MainElectricPanel,apartfromdeviceslistedabove(controlboard,OP,etc.)alsocontainsVoltageMonitor;
someoptionalcontrolsensorsanddevicessuchasanairpressuredifferentialsensor,currentsensor(s).Itmay
alsobelocatedinmainelectricalpanelorinthedehumidifieringeneral.

Pic.D.4 
21
23
24
22
26
27
25
28

D–LayoutandComponents
D‐
4 
OutdoorAirCondensersandFluidCoolersLayoutandComponents .

ThegenerallayoutofACoptions(air‐andwater‐cooled)isshownonPic.D.5belowwiththeoutdooraircondenser
NC‐B‐1(left)andfluidcoolerNG‐V‐0(right)asanexample.Whilelayoutandmaincomponentsaresimilarforall
applicableACoptions,therearesomedeviations(numberoffans,coilsizes,composition,etc.).RefertoAC
Options(BasicInformationchapter)foradditionalinformation.


Cooling(AC)coil(31)(whereheatfromrefrigerantintheoutdoorcondenserorglycolmixtureinfluidcooleris
rejectedtotheambientair)ismountedontometalframe/airboxupstream(before)thefan(32),thatpulls
theairthroughthecoiltoabsorbtheheat.
oCondenser/coolerpipingconnections(33)areidentifiedrespectively(IN–OUT,Hotgas–Liquidetc.);
Insomecases,fluidcoolerpipingconnection(s)maybelocatedwithinpumppackagebox
(37),iffluidcoolerisprovidedwithone.
Pipingconnectionlocationmayvary–refertoparticularcooler/condenserlabels,stickers,
submittalandotherdocumentation.
oDependingonthetype,sizeandinstallation,outdoorcondensersmaybeprovidedwithdifferentset
oflegs/supports(34),whicharerequiredassemblyon‐site–refertotheInstallationmanual.
oDependingonthesizeandcapacity,condenserorcoolermayhavemultiplefansorcoils.
Electricpowerisnormallytobebroughttodisconnect(35)(ifcooler/condenserisequippedwithsuch),which
feedsittotheelectricalbox(36),thatcontainscondenserorcoolerpowerandcontrolapparatuses.
oDependingontypeoffluidcooler,locationofelectricalboxmayslightlydiffer.
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32
36
35
33
34
37
31
NC‐B‐1
NG‐V‐0
Pic.D.5

D–LayoutandComponents
OMM.D.S.SL.01 D‐ 5 June 2020 
FluidCoolersPumpPackage
FluidCoolers,ifequippedwithsuchoption,wouldhaveapumppackagebox.Pic.D.6belowshowsgenerallayout
ofpumppackages,usedforNG‐Z(left)andNG‐V(right)fluidcoolers.NotethatthepackageusedwithNG‐V
coolerscouldbemountedontothefluidcoolerdirectly(standard)orprovidedseparately.
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Pump(38)establishesglycolmixturecirculationthroughthefluidcooleranddehumidifier;
Expansiontank(39)compensatesfortemperature‐basedglycolvolumefluctuation;
Thepumppackageelectricalsub‐panel(40)containsthepumppackageelectricalpowerandcontrol
apparatuses.
oDuetothecompactdesignofthefluidcoolerNG‐Z,theelectricalsub‐panelincludespowerand
controlapparatusesforthefluidcoolerandthepumppackageitself.
Thepumppackagemanifoldsareusuallyequippedwithpressuregauges,automaticairventingvalve,draining
andothervalves.
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40383938
4039
Pic.D.6
NG‐ZNG‐V

D–LayoutandComponents
D‐
6 
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E–SequenceofOperation
OMM.E.S.SL.02 E‐ 1 February 2020 
SequenceofOperation
Thedehumidifier’sventilationsystemestablishestherequiredairflowthroughthedehumidifier.Thecontrol
systemcomparesairtemperatureandhumiditytotheirdesiredvalues(setpoints)andproceedstodehumidify,
coolorheattherecirculatingair.
Ifthedehumidifierisequippedwiththepoolwaterheatingoption,thepoolwatertemperatureiscomparedtoits
setpointandpoolheatingisprovidedifrequired.
SetPoints
Thecontrolsystemisconstantlyadjustingunitoperationtoachieveandmaintainsaidparameterswithincouple
degrees/percentofthesetpoint.
Refertothedehumidifier’smainlabelforthedesignvalueofcontrolparameters,aswellasthefollowingnote.
Ventilation.
Themainblowerrunscontinuously,establishingrequiredairflowandpullingfreshoutdoorairontothepremise
throughtheminimumoutdoorairintake(OA1)damper.Themainblowerspeedispre‐setviaadjustablevariable
signal.
Dehumidifier,thoughusuallydoesnothaveitbuilt‐in,cancontroltheexternalminimumexhaustfan(EF1),to
directaportionofreturnairoutdoors.Likethemainblower,exhaustfanspeediscontrolledviaadjustable(pre‐
set)variablesignals:theexhaustfanspeedmayvarydependingonscheduledventilationmode(Occupied,Non‐
OccupiedandSpectator)orcallforEconomiserMode(aspartofAirConditioningand/orDehumidification
operation).
Note.ExternallyinstalledExhaustFan(s)andOutdoorAirdamper(s)couldbealsocontrolledbythe
dehumidifiercontrolsystem.Thisappliestoboth,MinimumandPurge/Additional,fansanddampers
AirConditioning,DehumidificationandPoolHeating.
Compressor(s) 
Wheneverthecompressoroperates,theevaporatorisalwaysdehumidifyingandcoolingthereturnair.Theheat
removedfromtheairattheevaporator,aswellastheheatfromthecompressor'saction,mustberejectedtoone
ofthreeheatsinks:room(premise)air,poolwater(ifapplicable)oroutdoors.Thecontrolsystemwilldirectthe
heattowhereitisneededbasedonroom(airandpoolwatertemperature)conditions:
Ifroomairisneededtobewarmedup–moreheatisdivertedtowardsreheatcoil;
Ifpoolwaterisneededtobewarmedup–moreheatisdivertedtowardspoolheatingcoaxialheatexchanger
(ifdehumidifierisequippedwiththisoption).
Restoftheheat(ifany)isdivertedtowardsoutdoors(outdoorcondenser,fluidcooler,etc.)
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Note: Toensurethedehumidifier’smosteconomicaloperation,werecommendmaintainingthefollowing
relationshipbetweenpoolwaterandroomairtemperatures:
RoomAirT=PoolWaterT+2˚F
Attention:R3Module 
Note: IfthedehumidifierisequippedwiththeR3Module(seeyourequipmentsubmittaldocumentation),refer
totheR3Modulechapterinthismanualforadditionalinformationaboutmoduleoptions,layout,andoperation.

E–SequenceofOperation
E‐
2 
CompressorCircuitOperation
PipingschematicforcompressorcircuitisshownonPic.E.1.
Whenademandrequiresthecompressortooperate,thefollowingsequenceoccurs:
‐Oncebloweroperation,relatedsafetiesandtimersareconfirmedbythecontrolsystem,thepumpdown
solenoidvalveopensandoncepressurestabilizes,thecompressorstarts.
‐Reheatvalvedivertsportionofhotgasintothereheatcoil.Remainderofthehotgasgoesintooutdoor
condenser(orwater‐cooledheatexchanger,coupledwithfluidcoolerorexternalfluidcoolingsystem)and(if
applicable)poolwaterheatexchanger.
o Dehumidifierwithpoolheatingoption:poolvalvedivertsportionofhotgasintopoolwaterheat
exchanger,basedonpoolwaterheatingdemand. 
o
Outdoorcondenser/fluidcoolerfanisengagedonlyifhotgasisdivertedoutdoors/towater‐cooled
heatexchangerandcompressorpressureishigherthanpre‐setlevel(seeOutdoorCondenserandFluid
CoolerOperationbelow).
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‐Oncedemandforthecompressor’soperationisremoved(respectivecallissatisfied),thepumpdownsolenoid
valvecloses;oncethecompressorsuctionpressurereachesthepre‐setpressure,thecompressorstops.
OutdoorCondenserandFluidCoolerOperation.
Basedonthetypeoftheoutdoorcondenserorfluidcoolerfans’type(two‐speedfansorEC‐type/modulating
fans),respectivesignal(s)aresentbycontrolsystemtoengagesaidfan(s):fortwo‐speedfans‐on/offsignals
(switchingspeeds,basedoncompressorheadpressurelevel),forEC‐typefans‐variable0‐10VDCsignal
(proportionaltothecompressorheadpressurelevel).Refertothefans’typeandwiringdiagramif/whenneeded.
Ifthefluidcoolerisequippedwiththebuilt‐inpumppackage(toestablishcoolingfluidflowbetweendehumidifier
andthefluidcoolerortoserveasadditional/boosterpump),thesaidpumpisalsoengagedalongwithfluidcooler
fans–pumpwouldstayengagedwhilefansareengaged(regardlessofthefans’speed).
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Pic.E.1

E–SequenceofOperation
OMM.E.S.SL.02 E‐ 3 February 2020 
SpaceHeating
Whenpremiseairtemperaturedropsbelowthesetpoint,thedehumidifiercontrolsystemissuesacallforSpace
HeatingModeandengagesspaceheater(electricheater,hotwatercoilwithvalveetc.)bysendingspaceheating
signal,respectivetospaceheatercontroltype‐on/off,variable(0‐10VDC),etc.
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