IEC CPY 04 - Valve Package Installation and Maintenance; Condensate Drain

Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
7
SECTIONONE—Receipt&InitialInstallation,Cont'd.
BEFOREbeginningtheconnectionofthevariouscooling
and/orheatingmediumstotheunit.
Horizontal Unit Drain Pan Removal
CXB,CBY,CHYandCPYHorizontalmodelscomewitha
removabledrainpan.Thedrainpanshouldberemoved
beforeinstallingorservicingthevalvepackage.An
extendeddrillbitmaybenecessarytoaccessthescrews
toremovethedrainpan.
NOTE: Exact location of screws to remove drain pan may vary based
on Horizontal model.
Valve Package Installation and Maintenance
Allaccessoryvalvepackagesshouldbeinstalledas
required,andallservicevalvesshouldbecheckedfor
properoperation.
Ifcoilandvalvepackageconnectionsaretobemadewith
a“sweat”orsolderjoint,careshouldbetakentoassure
thatnocomponentsinthevalvepackagearesubjected
toahightemperaturewhichmaydamagesealsorother
materials.Manytwo-positionelectriccontrolvalves,
dependingonvalveoperation,areprovidedwithamanual
openinglever.Thislevershouldbeplacedinthe“open”
positionduringallsolderingorbrazingoperations.
Ifthevalvepackageconnectionatthecoilismadewith
aunion,thecoilsideoftheunionmustbeprevented
fromtwisting(“backedup”)duringtighteningtoprevent
damagetothecoiltubing.Over-tighteningmustbe
avoidedtopreventdistorting(“eggshaping”)theunion
sealsurfaceanddestroyingtheunion.
Thesupplyandreturnconnectionsaremarkedonthecoil
stub-outsandthevalvepackage,withan“S”meaning
supplyorinletand“R”meaningreturnoroutletindicating
owdirectiontoandfromthecoil.Bluelettersmarkthe
chilledwaterconnectionsandredlettersmarkthehot
waterorsteamconnections.Inthecaseofeld-installed
valvesandpiping,thechilledwatervalvecluster(or
expansionvalveonDXunits)shouldbeinstalledinsuch
awaythatanydrippingorsweatingiscontainedinthe
drainpanorotherdevicesuchasanoptionalextended
drainpanorfactorydriplip.Factorydriplipsareeld
installedandmaybepackagedseparatelyfromtheunit.
Factorysuppliedcoolingcoilvalvepackageswillbe
arrangedtolocateasmuchofthepackageaspossible
overastandarddriplip.
Ifnoneoftheabovefactoryaccessorieshavebeen
providedwiththeunits,adriplip(availablefromthe
factory)maystillberequiredtodirectpipingcondensate
intotheunitdrainpan.
Aftertheconnectionsarecompleted,thesystemshould
thenbetestedforleaks.Sincesomecomponentsarenot
designedtoholdpressurewithagas,hydronicsystems
shouldbetestedwithwater.Pressuretestingshouldbe
completedpriortosheetrockingorpainting.
CAUTION: All water coils must be protected
from freezing after initial lling with water.
Even if the system is drained, unit coils may still hold
enough water to cause damage when exposed to
temperatures below freezing.
Refrigerantsystemsshouldbetestedwithdrynitrogen
ratherthanairtopreventtheintroductionofmoisture
intothesystem.Intheeventthatleakingordefective
componentsarediscovered,theSalesRepresentative
mustbenotiedBEFOREanyrepairsareattempted.
Allleaksshouldberepairedbeforeproceedingwiththe
installation.
Aftersystemintegrityhasbeenestablished,thepiping
shouldbeinsulatedinaccordancewiththeproject
specications.Thisistheresponsibilityoftheinstallingor
insulationcontractor.Allchilledwaterpipingandvalves
orrefrigerantsuctionpipingnotlocatedoverdrainpans
ordriplipsmustbeinsulatedtopreventdamagefrom
sweating.Thisincludesfactoryandeldpipinginsidethe
unitcabinet.
Condensate Drain:Thedrainshouldalwaysbeconnected
andpipedtoanacceptabledisposalpoint.Forproper
moisturecarry-off,thedrainpipingshouldbeslopedaway
fromtheunitatleast1/8inchperfoot.Adraintrapmay
berequiredbylocalcodesanditisstronglyrecommended
forodorcontainment.Whenfurnished,theoptional5/8-
inchsecondaryor“tell-tale”connectionmustbepipedto