Owner's Manual
For Models 350, 360, 400A, 400M, 500A,
500M, 600A, 600M, 700A & 700M
Includes Safety & Operating instructions
and Warranty information
i READAND SAVETHESE iNSTRUCTiONS
Introduction.................................................. 1
Principleof Operation.......................................... 2
OperatingInstructions- Models400A,400M,500A,600A& 700A ..... 4
• AutomaticMode .......................................... 5
ManualMode ............................................ 6
OperatingInstructions- Models350,360, 500M,600M & 700M ...... g
Checkthe HumidifierOperation.................................. g
AdditionalInformationfor All Models............................ 10
Effectof Water Characteristics................................. 10
AnnualMaintenance ......................................... 11
AnnualSummerShutdown .................................... 12
PeriodicPreventativeMaintenance.............................. 13
MAINTENANCEINSTRUCTIONS
Models350& 360 ......................................... 14
Models400A& 400M ...................................... 15
Models500A& 500M ...................................... 16
Models600A& 600M ...................................... 16
Models700A& 700M ...................................... 17
LimitedWarranty ............................................ 18
&WARNING
CAUTION
Thankyou for your recentAprilaire®humidifierpurchase.We appreciate
your businessand are pleasedto add your nameto our growing list of
customers.You haveinvestedin the highestquality equipmentavailable.
Aprilaire manufactureswhole-houseindoorair quality productsand is a
recognizedleaderinthe heatingandair conditioningindustry.
Yourhumidifierwill requireperiodicmaintenanceto assurecontinuedfine
performance.See page 11 to obtain service partsand/or replacement
Water Panel_°'evaporators.
Now, pleasetakea few minutesandreadthis booklet.Thiswill familiarize
you with the benefits you will receive from the equipment you just
purchasedand helpyou understandthe routine maintenancethat will be
required.
Besureto registeryour humidifierwarrantyonlineat:
www.aprilaire.com/warranty.
-1-
Introduction.................................................. 1
Principleof Operation.......................................... 2
OperatingInstructions- Models400A,400M,500A,600A& 700A ..... 4
• AutomaticMode .......................................... 5
ManualMode ............................................ 6
OperatingInstructions- Models350,360, 500M,600M & 700M ...... g
Checkthe HumidifierOperation.................................. g
AdditionalInformationfor All Models............................ 10
Effectof Water Characteristics................................. 10
AnnualMaintenance ......................................... 11
AnnualSummerShutdown .................................... 12
PeriodicPreventativeMaintenance.............................. 13
MAINTENANCEINSTRUCTIONS
Models350& 360 ......................................... 14
Models400A& 400M ...................................... 15
Models500A& 500M ...................................... 16
Models600A& 600M ...................................... 16
Models700A& 700M ...................................... 17
LimitedWarranty ............................................ 18
&WARNING
CAUTION
Thankyou for your recentAprilaire®humidifierpurchase.We appreciate
your businessand are pleasedto add your nameto our growing list of
customers.You haveinvestedin the highestquality equipmentavailable.
Aprilaire manufactureswhole-houseindoorair quality productsand is a
recognizedleaderinthe heatingandair conditioningindustry.
Yourhumidifierwill requireperiodicmaintenanceto assurecontinuedfine
performance.See page 11 to obtain service partsand/or replacement
Water Panel_°'evaporators.
Now, pleasetakea few minutesandreadthis booklet.Thiswill familiarize
you with the benefits you will receive from the equipment you just
purchasedand helpyou understandthe routine maintenancethat will be
required.
Besureto registeryour humidifierwarrantyonlineat:
www.aprilaire.com/warranty.
-1-
Withyourpurchaseofthishumidificationsystem,youhaveinvestedina humidifier
thatoperatesontheevaporativeprinciple-nature'sownwayofaddingmoisture
- providingoptimumrelativehumidity(RH)throughoutthe heatingseason.It is
verypossiblethatyouhavequestionsconcerningyournewhumidifier-questions
onwhatit candofor you,andwhatyoushoulddoto receivemaximumbenefits
fromit.Thisbookletis intendedto answerthesequestions.
Nature,inproducinganinvigoratingcomfortableAprilday,combinesjustthe
right temperatureand the right amountof moisture.Aprilairehumidifiers
employthesameprinciple,with refinements,to giveyoutheoptimumRHfor
maximumallowablecomfortall winter long.
Theimportantconsiderationsin the evaluationof a humidifierare precise
control, sufficient capacity, trouble-free performance and minimum
maintenance.The operatingprincipleof yourAprilairehumidifierprovides
all of theseadvantages.Here,briefly,is the method:
Exceptfor Models350and360,theAprilairehumidifieris installedto operate
in conjunctionwith the heating,ventilating,air conditioningequipment
(HVAC)blowermotor.WhentheAprilairehumidifierControlcallsfor humidity
andtheblowermotorisoperating,waterflows tothe distributiontraylocated
at the top of the humidifier.Thewater is uniformlydistributedacrossthe
width of the tray andthrougha scientificallydesignedsystemof outlets,it
flowsbygravityovertheWaterPanel_°'evaporator,theheartofthehumidifier.
Dry, hot air is movedthroughthe moisture-ladenWater Panelevaporator
where natural evaporationtakes place.The now-humidifiedair carrying
moistureinvaporform(nature'sownway)iscirculatedthroughoutthehome.
Models350 and 360 use servicehot water (140°Fmaximum)for a heat
source,as heat is neededfor evaporation.While the water goingto the
humidifieris hot,the flushingwater to the drainwill becold.The heat is
extractedduringthe evaporationprocess.
The correctwater flow is determinedby an orifice providedwith
each draintype humidifier.Whenthe humidifierisoperating, there
will be a small, steady stream of water to drain, which flushes
away mostof the trouble-causingminerals.
Donot usethe saddlevalvetoregulatethewater flow. It isdesigned
to he completelyopen or closed.
Themineralsandsolidresiduenot trappedbythe replaceableWaterPanel
evaporatorareflusheddownthedraininthe Models350,360,500A,500M,
600A,600M,700Aand700M.Thisis the mosteffectiveandleastexpensive
methodto disposeof trouble-causingminerals.The drainalso eliminates
the problemscausedby stagnantwater.
Therearesomehomeswheredrainfacilitiesarenot accessibleoravailable.
Forthesesituations,orwherehighwater hardnessis not a problem,Models
400Aand400Maredesignedto satisfytheseapplications.
Trouble-freeperformanceand minimummaintenanceare assuredby the
designfeaturesof the Aprilairehumidifier.All humidifierhousingpartsthat
comein contactwith water are non-metalandwill neverrustor corrode.
Neitherheatnorwater will affectthemundernormaloperatingconditions.
The Water Panel_' evaporator,designed especially for uniform, high
evaporation,andthe ScaleControlInsert(whichencasesthe Water Panel)
efficiently trapsmineraldepositswhichare often the causeof damageto
workingpartsin ordinaryhumidifiers.When properlymaintained,no"white
dust" will be distributedthroughthe livingquarters.The Water Panel
evaporator is the heart of the humidifier and must be in good
condition to assure high capacity trouble-free performance. It
should be changed at least annually with the exception of the
Models400Aand 400Mwhich shouldbe changedat leasttwice per
heatingseason.
Thedistributiontray incorporatesa syntheticfabriclinerthat is designedto
deliver water uniformlyover the entire top surfaceof the Water Panel
evaporator,providedthe humidifieris mountedlevel.It is normalfor some
mineral depositsto form in the distributiontray as it dries out between
humidificationcycles.Thesedepositscan actuallyhelp distributewater in
thetray,but if theyblocktheopenings,theyshouldberemovedasdescribed
in the "PeriodicPreventativeMaintenance"sectionof this manual.
YourAutomaticDigital HumidifierControlworks in conjunctionwith your
HVACto controlthe operationof the humidifier.Thecontrolsensesindoor
RHandoutdoortemperatureandautomaticallyadjuststhe operationtime
of the humidifierto providethe optimumhumiditylevelin the home.
Thedigital readoutonthe automaticcontroldisplaysthe RHlevelinsidethe
coldair returnduct.RHis a measureof the amountof moistureinthe airas
apercentageofwhat theaircanhold.Warmaircanholdmoremoisturethan
coldair can.Thisreadingwill accuratelyindicatethe RHinthe livingspace
when the HVACblower is operating.Oncethe HVACblower stops,the
readoutwill not change.
Thecontrolhas lightswhich indicatehumidifieroperation,when the water
panelneedsto be replacedandwhen serviceis required.See"Operating
instructions"formoreinformation.
Thereare manyhumidifierson the market.Theyall addmoisture.., with
varyingdegreesof efficiency.None,however,offer the features,design,
andperformanceincorporatedinto yournew Aprilairehumidifier.
Withyourpurchaseofthishumidificationsystem,youhaveinvestedina humidifier
thatoperatesontheevaporativeprinciple-nature'sownwayof addingmoisture
- providingoptimumrelativehumidity(RH)throughoutthe heatingseason.It is
verypossiblethatyouhavequestionsconcerningyournewhumidifier-questions
onwhatit candofor you,andwhatyoushoulddoto receivemaximumbenefits
fromit.Thisbookletis intendedto answerthesequestions.
Nature,inproducinganinvigoratingcomfortableAprilday,combinesjustthe
right temperatureand the right amountof moisture.Aprilairehumidifiers
employthesameprinciple,with refinements,to giveyoutheoptimumRHfor
maximumallowablecomfortall winter long.
Theimportantconsiderationsin the evaluationof a humidifierare precise
control, sufficient capacity, trouble-free performance and minimum
maintenance.The operatingprincipleof yourAprilairehumidifierprovides
all of theseadvantages.Here,briefly,is the method:
Exceptfor Models350and360,theAprilairehumidifieris installedto operate
in conjunctionwith the heating,ventilating,air conditioningequipment
(HVAC)blowermotor.WhentheAprilairehumidifierControlcallsfor humidity
andtheblowermotorisoperating,waterflows tothe distributiontraylocated
at the top of the humidifier.Thewater is uniformlydistributedacrossthe
width of the tray andthrougha scientificallydesignedsystemof outlets,it
flowsbygravityovertheWaterPanel_°'evaporator,theheartof thehumidifier.
Dry, hot air is movedthroughthe moisture-ladenWater Panelevaporator
where natural evaporationtakes place.The now-humidifiedair carrying
moistureinvaporform(nature'sownway)iscirculatedthroughoutthehome.
Models350 and 360 use servicehot water (140°Fmaximum)for a heat
source,as heat is neededfor evaporation.While the water goingto the
humidifieris hot,the flushingwater to the drainwill becold.The heat is
extractedduringthe evaporationprocess.
The correctwater flow is determinedby an orifice providedwith
each draintype humidifier.Whenthe humidifierisoperating, there
will be a small, steady stream of water to drain, which flushes
away mostof the trouble-causingminerals.
Donot usethe saddlevalvetoregulatethewater flow. It isdesigned
to he completelyopen or closed.
Themineralsandsolidresiduenot trappedbythe replaceableWaterPanel
evaporatorareflusheddownthedraininthe Models350,360,500A,500M,
600A,600M,700Aand700M.Thisis the mosteffectiveandleastexpensive
methodto disposeof trouble-causingminerals.The drainalso eliminates
the problemscausedby stagnantwater.
Therearesomehomeswheredrainfacilitiesarenot accessibleoravailable.
Forthesesituations,orwherehighwater hardnessis not a problem,Models
400Aand400Maredesignedto satisfytheseapplications.
Trouble-freeperformanceand minimummaintenanceare assuredby the
designfeaturesof the Aprilairehumidifier.All humidifierhousingpartsthat
comein contactwith water are non-metalandwill neverrustor corrode.
Neitherheatnorwater will affectthemundernormaloperatingconditions.
The Water Panel_' evaporator,designed especially for uniform, high
evaporation,andthe ScaleControlInsert(whichencasesthe Water Panel)
efficiently trapsmineraldepositswhichare often the causeof damageto
workingpartsin ordinaryhumidifiers.When properlymaintained,no"white
dust" will be distributedthroughthe livingquarters.The Water Panel
evaporator is the heart of the humidifier and must be in good
condition to assure high capacity trouble-free performance. It
should be changed at least annually with the exception of the
Models400Aand 400Mwhich shouldbe changedat leasttwice per
heatingseason.
Thedistributiontray incorporatesa syntheticfabriclinerthat is designedto
deliver water uniformlyover the entire top surfaceof the Water Panel
evaporator,providedthe humidifieris mountedlevel.It is normalfor some
mineral depositsto form in the distributiontray as it dries out between
humidificationcycles.Thesedepositscan actuallyhelp distributewater in
thetray,but if theyblocktheopenings,theyshouldberemovedasdescribed
in the "PeriodicPreventativeMaintenance"sectionof this manual.
YourAutomaticDigital HumidifierControlworks in conjunctionwith your
HVACto controlthe operationof the humidifier.Thecontrolsensesindoor
RHandoutdoortemperatureandautomaticallyadjuststhe operationtime
of the humidifierto providethe optimumhumiditylevelin the home.
Thedigital readoutonthe automaticcontroldisplaysthe RHlevelinsidethe
coldair returnduct.RHis a measureof the amountof moistureinthe airas
apercentageofwhat theaircanhold.Warmaircanholdmoremoisturethan
coldair can.Thisreadingwill accuratelyindicatethe RHinthe livingspace
when the HVACblower is operating.Oncethe HVACblower stops,the
readoutwill not change.
Thecontrolhas lightswhich indicatehumidifieroperation,when the water
panelneedsto be replacedandwhen serviceis required.See"Operating
instructions"formoreinformation.
Thereare manyhumidifierson the market.Theyall addmoisture.., with
varyingdegreesof efficiency.None,however,offer the features,design,
andperformanceincorporatedinto yournew Aprilairehumidifier.
TheAutomaticDigitalHumidifierControlofferstwomodesofoperation,
AutomaticorManual.Anexplanationofbothmodesfollows.(SeeFigureA
onpage5forAutomaticMode.SeeFigureBonpage6forManualMode.)
WhenintheAutomaticMode,thissystemoffersthefollowingbenefits:
• You will always receivethe optimum amount of humidityso that
your home and its furnishings are always protected from the
damaging effects ofexcess condensationor low humidityduring
the heatingseason.The Controlautomaticallyadjustsyour home'sRH
basedonthe outdoortemperature,increasingthetime maximumcomfort
is maintained.
• Simple operation with few adjustments. TheControleliminatesthe
needto manuallyadjustthe controlwhen outdoortemperaturechanges.
It also eliminatesthe needto turn the dial setting to "OFF"duringthe
summerseason.
Call Dealerfor Service: Thered light indicatesthatthe humidifieris not
operatingnormallyandthat serviceis required.
ChangeWater Panel:Theyellow light indicatesthat it is timeto change
theWater Panelin the humidifier.
Humidifier On: Thegreenlight indicatesthat the humidifieris operating
normally.
Automatic Humidifier Control
Humidity
(_ Humidifier On
::_"x._ so°s; _.. o
90 1235
YourAprilaire HumidifierControlis installed in the cold air return duct.
Duringthefirst heatingseason,yourHumidifierControlneedsto beset
initially to matchyour home'scondition.Pleasefollow thesesteps when
adjustingyourcontrol(referto FigureA).
1.Turn the dial setting knob to "5," which is within the normalrange.
Duringthe next 24-48hoursit maybe necessaryto adjust the dial for
moreor lesshumidity,dependingon your personalcomfortandhome's
requirements.Referto TABLE3 - OperationGuide.
2. Duringthe coldestportionof the first heatingseason,minoradjustments
may be necessary.This is dependentuponyour home'sconstruction.
Referto TABLE3- OperationGuide.
TheRHin yourhomewill now beaccuratelycontrolledto meetyour needs
and should not needfurther adjustmentduringfuture heating seasons.
Makenoteof the dialsetting inthe eventyoutemporarilymovethe knobto
"OFF"when performingannual maintenanceof yourAprilaire humidifier.
TheAutomaticDigitalHumidifierControlofferstwomodesofoperation,
AutomaticorManual.Anexplanationofbothmodesfollows.(SeeFigureA
onpage5forAutomaticMode.SeeFigureBonpage6forManualMode.)
WhenintheAutomaticMode,thissystemoffersthefollowingbenefits:
• You will always receivethe optimum amount of humidityso that
your home and its furnishings are always protected from the
damaging effects ofexcess condensationor low humidityduring
the heatingseason.The Controlautomaticallyadjustsyour home'sRH
basedonthe outdoortemperature,increasingthetime maximumcomfort
is maintained.
• Simple operation with few adjustments. TheControleliminatesthe
needto manuallyadjustthe controlwhen outdoortemperaturechanges.
It also eliminatesthe needto turn the dial setting to "OFF"duringthe
summerseason.
Call Dealerfor Service: Thered light indicatesthatthe humidifieris not
operatingnormallyandthat serviceis required.
ChangeWater Panel:Theyellow light indicatesthat it is timeto change
theWater Panelin the humidifier.
Humidifier On: Thegreenlight indicatesthat the humidifieris operating
normally.
Automatic Humidifier Control
Humidity
(_ Humidifier On
::_"x._ so°s; _.. o
90 1235
YourAprilaire HumidifierControlis installed in the cold air return duct.
Duringthefirst heatingseason,yourHumidifierControlneedsto beset
initially to matchyour home'scondition.Pleasefollow thesesteps when
adjustingyourcontrol(referto FigureA).
1.Turn the dial setting knob to "5," which is within the normalrange.
Duringthe next 24-48hoursit maybe necessaryto adjust the dial for
moreor lesshumidity,dependingon your personalcomfortandhome's
requirements.Referto TABLE3 - OperationGuide.
2. Duringthe coldestportionof the first heatingseason,minoradjustments
may be necessary.This is dependentuponyour home'sconstruction.
Referto TABLE3- OperationGuide.
TheRHin yourhomewill now beaccuratelycontrolledto meetyour needs
and should not needfurther adjustmentduringfuture heating seasons.
Makenoteof the dialsetting inthe eventyoutemporarilymovethe knobto
"OFF"when performingannual maintenanceof yourAprilaire humidifier.
Automatic Humidifier Control
J Humidity
J °Change Water Panel
°Humidifier On
gO 1236
When installed in the Manual Mode (see Figure B), it is importantto
anticipatea dropin outdoortemperatureandreducethesettingaccordingly
to avoidexcessivecondensation.Forexample,with anoutdoortemperature
of 20°Fthecorrectsettingwill be35%RH.Ifthe temperatureis expectedto
fall to O°Fthatevening,then merelyreducethe settingto 25%severalhours
priorto the temperaturechange.
SeeTable I fortherecommendedsettings.Thesesettings,whicharebasedon
yearsof research,representa compromisebetweenRHlevelsthat wouldbe
mostdesirablefor comfortandhumiditylevelsthataresuitablefor protection
of your homeandto avoidcondensationon yourwindows.Forexample,a
wintertime indoor RH of 50% may be consideredideal for comfort, but
unfortunately,it probablywould result in condensation,which can cause
damageto your home. Observingthe recommendedRH levelson your
HumidifierControlis an importantsafeguard.Condensationof water on the
insidesurfaceofwindowsintheformof foggingorfrost isusuallyanindication
of too muchRH.Thissamecondensationcan occurin other areasin your
home,possiblyresultingindamage.
+40°F
+30°F
+20°F
+IO°F
OOF
-IOOF
-20OF
45%
40%
35%
30%
25%
20%
15%
WATERPANELCHANGEINDICATOR
The controlkeepstrack of humidifieroperationtime. Theyellow "Change
Water Panel" light flashes after a preset amount of runningtime has
elapsed.Thisrunningtime is presetbythe installerbasedonthe humidifier
modelandwatercharacteristics.
Referto the AnnualMaintenancesectionfor instructionson changingthe
WaterPanelorcallyourheatingandairconditioningdealerfor service.After
the Water Panelis replaced,turn the Control knob to the "Test/Reset"
positionuntil the green"HumidifierON" lightflashes,to resetthe Water
Panelchangetimer.
TEST/RESET
TheTest/Resetfeatureallowsthe humidifieroperationto becheckedevenif
thereis nocallfor humidity.See"ChecktheHumidifierOperation"onpage9.
ADDITIONALINFORMATION
Yourhumidifieris a precisionsystemthat will accuratelymaintainthe RHin
your home.For every2°Fchange in outdoortemperature,the Automatic
DigitalHumidifierControlwill automaticallyadjustthe indoorRHby 1%.
TheAutomaticDigitalHumidifierControlwill accuratelycontrolthe humidity
inyourhometo a maximumof 45%RHanda minimumof 10%RH.
TheRHValuesinTable 2 aretargetsbasedonoutdoortemperatureandthe
ADHCcontrolsetting.TheactualRHmayvarydueto conditionsin the home
(cooking,showering,etc.).
I
2
3
4
5
6
7
-10oF 0OF 10oF 20°F 30oF 40oF
10% 10% 15% 25% 30% ii@iii!i!i_@iiii!
10% 15% 20% 30% 35% ii!ii!ii!ii!ii!ii!ii!ii!ii!ii!ii!iiii!i_i!!iiiiiiiiiiiiiiiiiiii!i!
15% 20% 25% 35% 40%
E 40% 45% !i!iiii_iiiiiii_iiiii!iii_i_i_i_i_.:::::::;,
25% 30% 35% 40% 45% 45% i!_i!_i!_i!_i!_i!ii!!i!i!_;i;i;i;i;i;i;:i;i:;:i;iils!i!
30% 35% 40% 45% 45% 45% ...............................
Automatic Humidifier Control
J Humidity
J °Change Water Panel
°Humidifier On
gO 1236
When installed in the Manual Mode (see Figure B), it is importantto
anticipatea dropin outdoortemperatureandreducethesettingaccordingly
to avoidexcessivecondensation.Forexample,with anoutdoortemperature
of 20°Fthecorrectsettingwill be35%RH.Ifthe temperatureis expectedto
fall to O°Fthatevening,then merelyreducethe settingto 25%severalhours
priorto the temperaturechange.
SeeTable I fortherecommendedsettings.Thesesettings,whicharebasedon
yearsof research,representa compromisebetweenRHlevelsthat wouldbe
mostdesirablefor comfortandhumiditylevelsthataresuitablefor protection
of your homeandto avoidcondensationon yourwindows.Forexample,a
wintertime indoor RH of 50% may be consideredideal for comfort, but
unfortunately,it probablywould result in condensation,which can cause
damageto your home. Observingthe recommendedRH levelson your
HumidifierControlis an importantsafeguard.Condensationof water on the
insidesurfaceofwindowsintheformof foggingorfrost isusuallyanindication
of too muchRH.Thissamecondensationcan occurin other areasin your
home,possiblyresultingindamage.
+40°F
+30°F
+20°F
+IO°F
OOF
-IOOF
-20OF
45%
40%
35%
30%
25%
20%
15%
WATERPANELCHANGEINDICATOR
The controlkeepstrack of humidifieroperationtime. Theyellow "Change
Water Panel" light flashes after a preset amount of runningtime has
elapsed.Thisrunningtime is presetbythe installerbasedonthe humidifier
modelandwatercharacteristics.
Referto the AnnualMaintenancesectionfor instructionson changingthe
WaterPanelorcallyourheatingandairconditioningdealerfor service.After
the Water Panelis replaced,turn the Control knob to the "Test/Reset"
positionuntil the green"HumidifierON" lightflashes,to resetthe Water
Panelchangetimer.
TEST/RESET
TheTest/Resetfeatureallowsthe humidifieroperationto becheckedevenif
thereis nocallfor humidity.See"ChecktheHumidifierOperation"onpage9.
ADDITIONALINFORMATION
Yourhumidifieris a precisionsystemthat will accuratelymaintainthe RHin
your home.For every2°Fchange in outdoortemperature,the Automatic
DigitalHumidifierControlwill automaticallyadjustthe indoorRHby 1%.
TheAutomaticDigitalHumidifierControlwill accuratelycontrolthe humidity
inyourhometo a maximumof 45%RHanda minimumof 10%RH.
TheRHValuesinTable 2 aretargetsbasedonoutdoortemperatureandthe
ADHCcontrolsetting.TheactualRHmayvarydueto conditionsin the home
(cooking,showering,etc.).
I
2
3
4
5
6
7
-10oF 0OF 10oF 20°F 30oF 40oF
10% 10% 15% 25% 30% ii@iii!i!i_@iiii!
10% 15% 20% 30% 35% ii!ii!ii!ii!ii!ii!ii!ii!ii!ii!ii!iiii!i_i!!iiiiiiiiiiiiiiiiiiii!i!
15% 20% 25% 35% 40%
E 40% 45% !i!iiii_iiiiiii_iiiii!iii_i_i_i_i_.:::::::;,
25% 30% 35% 40% 45% 45% i!_i!_i!_i!_i!_i!ii!!i!i!_;i;i;i;i;i;i;:i;i:;:i;iils!i!
30% 35% 40% 45% 45% 45% ...............................
Condensationonwindows. Reducethesettingonthecontroldialby
1increment.
Lackofhumidity. Increasethesettingonthecontroldialby
1increment.
Humidifierdoesnotoperate.
(Solenoiddoesnot"click"
whencontrolismovedto
"Test/Reset"position.)
Humidifierwon'tshutoff.
Turndialto"Test/Reset".Makecertain
HVACblowerisoperatingandHVACis
callingforheat.Ifunitstilldoesnot
operate,consultaheatingcontractor.
Turndialto"Off':Ifunitcontinuesto
operate,consultaheatingcontractor.
Testmode.
Red"CallDealerforService"
lightflashes(FigureA).
Yellow"ChangeWaterPanel"
lightflashes(FigureA).
Systemoperationis checkedbysetting
the knobto "Test/Reset".Makecertain
HVACbloweris operatingandHVACis
callingfor heat.Humidifierwill operate
for oneminute.NOTE:Placingthe knob
in"Test/Reset"resetstheWater Panel
changetimer.
Notetheerrorcodeonthedisplay(El, E2,
E3or E4)andcall yourheatingandair
conditioningdealer.
Referto the AnnualMaintenancesection
(page11)for instructionsonchanging
the Water Panelor call yourheatingand
air conditioningdealerfor service.After
the Water Panelis replaced,turnthe
Controlknobto the "Test/Reset"
positionuntilthe green"HumidifierOn"
lightflashes,to resettheWater Panel
changetimer.
WHENOUTSmDETEMPIS-2O_ 0_ .20_
RESETHUMIDITYTO 15% 25% 35%
OFF
90 1237
YourAprilairehumidifieris controlledby a ManualHumidifierControl(see
FigureC).The ManualHumidifierControlis installedeither in the coldair
returnductor onan interiorwall of the home.With the ManualHumidifier
Control,it is importantto anticipateadropinoutdoortemperatureandreduce
the setting accordinglyto avoid excessivecondensation,just as with the
AutomaticDigitalHumidifierControlinstalledin ManualMode(seepage6).
TodeterminetheindoorRH,slowlyturntheknobclockwiseandcounterclockwise
andlistenfor 2 clicks.TheindoorRHiswithin the rangeof the 2clicks.
Setthe knobto "Test/Reset",makesurethat thewater saddlevalveis open
andthat there is electricityto the humidifier.The HVACsystemmust be
operating for the humidifier to function. Note: Turning the knob to
"Test/Reset"resetsthe "ChangeWater Panel"timer. The humidifierwill
only operatefor 1 minute in test mode.Reducethe Humidifier Control
setting to the recommendedinside RH, depending on the outside
temperature.DO NOT LEAVEIN TESTMODE AS HUMIDIFIERWILL
NOTOPERATE.
Setthe knobto the highestsetting,makesurethat thewatersaddlevalveis
openandthat there is electricityto the humidifier.TheHVACsystemmust
beoperatingfor the humidifierto function.Confirmthatthe solenoidvalveis
energizedandwateris flowing intothe humidifier(Models400Aand400M:
Floatsmustbedownfor the solenoidvalveto allow waterflow).
Condensationonwindows. Reducethesettingonthecontroldialby
1increment.
Lackofhumidity. Increasethesettingonthecontroldialby
1increment.
Humidifierdoesnotoperate.
(Solenoiddoesnot"click"
whencontrolismovedto
"Test/Reset"position.)
Humidifierwon'tshutoff.
Turndialto"Test/Reset".Makecertain
HVACblowerisoperatingandHVACis
callingforheat.Ifunitstilldoesnot
operate,consultaheatingcontractor.
Turndialto"Off':Ifunitcontinuesto
operate,consultaheatingcontractor.
Testmode.
Red"CallDealerforService"
lightflashes(FigureA).
Yellow"ChangeWaterPanel"
lightflashes(FigureA).
Systemoperationis checkedbysetting
the knobto "Test/Reset".Makecertain
HVACbloweris operatingandHVACis
callingfor heat.Humidifierwill operate
for oneminute.NOTE:Placingthe knob
in"Test/Reset"resetstheWater Panel
changetimer.
Notetheerrorcodeonthedisplay(El, E2,
E3or E4)andcall yourheatingandair
conditioningdealer.
Referto the AnnualMaintenancesection
(page11)for instructionsonchanging
the Water Panelor call yourheatingand
air conditioningdealerfor service.After
the Water Panelis replaced,turnthe
Controlknobto the "Test/Reset"
positionuntilthe green"HumidifierOn"
lightflashes,to resettheWater Panel
changetimer.
WHENOUTSmDETEMPIS-2O_ 0_ .20_
RESETHUMIDITYTO 15% 25% 35%
OFF
90 1237
YourAprilairehumidifieris controlledby a ManualHumidifierControl(see
FigureC).The ManualHumidifierControlis installedeither in the coldair
returnductor onan interiorwall of the home.With the ManualHumidifier
Control,it is importantto anticipateadropinoutdoortemperatureandreduce
the setting accordinglyto avoid excessivecondensation,just as with the
AutomaticDigitalHumidifierControlinstalledin ManualMode(seepage6).
TodeterminetheindoorRH,slowlyturntheknobclockwiseandcounterclockwise
andlistenfor 2 clicks.TheindoorRHiswithin the rangeof the 2clicks.
Setthe knobto "Test/Reset",makesurethat thewater saddlevalveis open
andthat there is electricityto the humidifier.The HVACsystemmustbe
operating for the humidifier to function. Note: Turning the knob to
"Test/Reset"resetsthe "ChangeWater Panel"timer. The humidifierwill
only operatefor 1 minute in test mode.Reducethe Humidifier Control
setting to the recommendedinside RH, depending on the outside
temperature.DO NOT LEAVEIN TESTMODE AS HUMIDIFIERWILL
NOTOPERATE.
Setthe knobto the highestsetting,makesurethat thewatersaddlevalveis
openandthat there is electricityto the humidifier.TheHVACsystemmust
beoperatingfor the humidifierto function.Confirmthatthe solenoidvalveis
energizedandwateris flowing intothe humidifier(Models400Aand400M:
Floatsmustbedownfor the solenoidvalveto allow waterflow).
Besuretokeepfireplacedampersclosedwhennotinuse.Theyprovidean
excellentescaperouteforheat,aswellashumidity.
Onoccasion,indoormoistureproducingactivitiessuchasclothesdrying,
cooking,showers,etc.,mayraisetheRHlevelhigherthanitshouldbe,even
thoughtheAprilairehumidifierisnotoperating.Telltaleindicationsare
condensationorfrostoncoldsurfacessuchaswindows,doors,walls,etc.If
suchcondensationpersistsforseveralhours,yourhomeshouldbeventilated
todissipatethepotentiallydamagingexcessmoisture.
Yourhumidifierisdesignedtooperateusinghot,cold,hardormechanically
softenedwater.(HotwaterisrequiredforModels350and360.)
Watercontainsvaryingamountsofminerals.Theresidueremainingasa
resultof hardwaterevaporationis primarilycalciumandmagnesium
componentsandisusuallyquitehard,scaly,anddense.
Residuefromsoftenedwatertendstobesoftandfluffyandhasagreater
volumethanhardwaterdeposits.Ineithercase,theservicelifeofaWater
Panelevaporatorwillbethesame.TheWaterPanelevaporatorshouldbe
changedatleastonceayearwiththeexceptionofModels400Aand
400Mwhichshouldbechangedatleasttwiceaheatingseason.Inthe
drain-equippedmodels,mostof themineralsolidsarecontrolledby
flushingthemdownthedrain.
Hotsupplywater,140°Fmaximum,is recommendedwithdraintype
humidifiersforincreasingcapacityandisrequiredforheatpumpandair
handlerapplications.
Forbestperformance,we recommendthat you replace the Water
Panel evaporatorinyourAprilaire humidifierat leastannually with
the exceptionof Models 400Aand 400Mwhich shouldbe changed
at leasttwice perheatingseason.
The"ChangeWaterPanel"indicatorlight(AutomaticControlonly)will blink
whenit is timeto changeyourWaterPanel.Seeindividualmodelinstructions
for additionalmaintenance.
To
o
o
o
o
purchasea newWater Panel:
Call the installerof yourAprilairehumidifier.
Thisinformationis oftenfoundonyourequipment.
Call yourheatingandair conditioningdealer.
Useour"DealerLocator"at: www.aprilaire.com
Lookin theYellow PagesunderHumidifyingApparatusor
Heating& Air ConditionerContractors.
If noneof the aboveis successfulandyou still needinformation,
pleasefeel free to write us.
• PurchaseonlyGenuineAprilaireWaterPanelsto maintainperformance.
If your humidifieris equippedwith an AutomaticHumidifierControlwith
Water Panelchangeindicator,after replacingthe Water Panel,turn the
controlknobto the "Test/Reset"positionuntilthe "HumidifierOn"lightblinks
to resetits timer.(Blowermustbe operatingandHVACcallingfor heat.)Be
sureto turnthe controlknobbackto it'soriginalsetting.If the"HumidifierOn"
lightcontinuesto blink,yourhumidifieris inTestmode.DONOTLEAVETHE
CONTROLIN TESTMODEORHUMIDIFIERWILL NOTOPERATE.
VVARNING
-10- -11-
Besuretokeepfireplacedampersclosedwhennotinuse.Theyprovidean
excellentescaperouteforheat,aswellashumidity.
Onoccasion,indoormoistureproducingactivitiessuchasclothesdrying,
cooking,showers,etc.,mayraisetheRHlevelhigherthanitshouldbe,even
thoughtheAprilairehumidifierisnotoperating.Telltaleindicationsare
condensationorfrostoncoldsurfacessuchaswindows,doors,walls,etc.If
suchcondensationpersistsforseveralhours,yourhomeshouldbeventilated
todissipatethepotentiallydamagingexcessmoisture.
Yourhumidifierisdesignedtooperateusinghot,cold,hardormechanically
softenedwater.(HotwaterisrequiredforModels350and360.)
Watercontainsvaryingamountsofminerals.Theresidueremainingasa
resultof hardwaterevaporationis primarilycalciumandmagnesium
componentsandisusuallyquitehard,scaly,anddense.
Residuefromsoftenedwatertendstobesoftandfluffyandhasagreater
volumethanhardwaterdeposits.Ineithercase,theservicelifeofaWater
Panelevaporatorwillbethesame.TheWaterPanelevaporatorshouldbe
changedatleastonceayearwiththeexceptionofModels400Aand
400Mwhichshouldbechangedatleasttwiceaheatingseason.Inthe
drain-equippedmodels,mostof themineralsolidsarecontrolledby
flushingthemdownthedrain.
Hotsupplywater,140°Fmaximum,is recommendedwithdraintype
humidifiersforincreasingcapacityandisrequiredforheatpumpandair
handlerapplications.
Forbestperformance,we recommendthat you replace the Water
Panel evaporatorinyourAprilaire humidifierat leastannually with
the exceptionof Models 400Aand 400Mwhich shouldbe changed
at leasttwice perheatingseason.
The"ChangeWaterPanel"indicatorlight(AutomaticControlonly)will blink
whenit is timeto changeyourWaterPanel.Seeindividualmodelinstructions
for additionalmaintenance.
To
o
o
o
o
purchasea newWater Panel:
Call the installerof yourAprilairehumidifier.
Thisinformationis oftenfoundonyourequipment.
Call yourheatingandair conditioningdealer.
Useour"DealerLocator"at: www.aprilaire.com
Lookin theYellow PagesunderHumidifyingApparatusor
Heating& Air ConditionerContractors.
If noneof the aboveis successfulandyou still needinformation,
pleasefeel free to write us.
• PurchaseonlyGenuineAprilaireWaterPanelsto maintainperformance.
If your humidifieris equippedwith an AutomaticHumidifierControlwith
Water Panelchangeindicator,after replacingthe Water Panel,turn the
controlknobto the "Test/Reset"positionuntilthe "HumidifierOn"lightblinks
to resetits timer.(Blowermustbe operatingandHVACcallingfor heat.)Be
sureto turnthe controlknobbackto it'soriginalsetting.If the"HumidifierOn"
lightcontinuesto blink,yourhumidifieris inTestmode.DONOTLEAVETHE
CONTROLIN TESTMODEORHUMIDIFIERWILL NOTOPERATE.
VVARNING
-10- -11-
ForModels400A,400M,500A,500M,600Aand600Mclosethe bypass
damper,which is a partof the humidifier,with the smalldamperhandle.
HumidifierControl:
AutomaticDigitalHumidifierControlinAutomaticMode(seeFigure A):
Noadjustmentis necessary.
AutomaticDigitalHumidifierControlinManualMode(seeFigure B):
Setthe knobto the "OFF"position.
ManualHumidifierControl(seeFigure C):Setthe knobto the "OFF"
position.
NOTE:Periodicinspection and preventativemaintenanceof your total
heatingsystemis importantfor efficientand safeoperation.Yourheating
contractorcan serviceyour humidifierat the sametime he servicesthe
HVACsystem.
All modelshavea distributiontrayabovethe WaterPanel,whichshouldbe
inspectedannuallyandcleanedof excessmineraldeposits.Oldermodels
havea granularcoatingin the distributiontray. Do not scrapethe granuals
out of the tray. Newermodelshavea fabricliner inthe distributiontray.
[]_ WATER
FEEDTUBE
OUTLET
COMPRESSION
NUT
ORIFICE
_ OLENOID
VALVE
INLET
90 1053
IN-LINE
STRAINER
'C O%RESS,ON
NUT
1. Disconnectelectricalpowerto the HVAC
andshutoff water supply.
2. Disconnectthe water line at the inlet
compressionnut.
3. Removethe in-line strainer from inside
the inlet sideof the valvebyusinga small
nail orwire.
4. Flushthe in-line strainercleanor replace
with a new strainer,PartNo. 4004.
5. Reconnectthe inlet water line. Double
Wrench to PreventLeaking.
6. Disconnectthe water feed tube at the
outlet compressionnut.
7. Inspect the water feed tube by gently
flexing it andlookingfor cracksorsignsof
wear. Replacetubeif it iscracked,brittle,
orhasbeendamaged.
8. Inspectthe orifice in the water feed tube
and make sure the small opening is
unplugged.
9. Reconnectthe waterfeed tube. Double Wrench to Prevent Leaking.
10.Removethedrainlinefromthebottomof thehumidifier.If applicable,flex it
to loosenanymineraldepositsorblockages.Flushthe drainlinewith water
underpressureto clearit of anydebris,andslipit backontothedrainfitting.
If drainlinedoesnotflow properly,replaceit. Inspectthedrainlineto make
sure it has a constantdownwardslope and is not flattened or blocked.
11. Turn on water supply and reconnect electrical power to the HVAC.
- 12 - - 13-
ForModels400A,400M,500A,500M,600Aand600Mclosethe bypass
damper,which is a partof the humidifier,with the smalldamperhandle.
HumidifierControl:
AutomaticDigitalHumidifierControlinAutomaticMode(seeFigure A):
Noadjustmentis necessary.
AutomaticDigitalHumidifierControlinManualMode(seeFigure B):
Setthe knobto the "OFF"position.
ManualHumidifierControl(seeFigure C):Setthe knobto the "OFF"
position.
NOTE:Periodicinspection and preventativemaintenanceof your total
heatingsystemis importantfor efficientand safeoperation.Yourheating
contractorcan serviceyour humidifierat the sametime he servicesthe
HVACsystem.
All modelshavea distributiontrayabovethe WaterPanel,whichshouldbe
inspectedannuallyandcleanedof excessmineraldeposits.Oldermodels
havea granularcoatingin the distributiontray. Do not scrapethe granuals
out of the tray. Newermodelshavea fabricliner inthe distributiontray.
[]_ WATER
FEEDTUBE
OUTLET
COMPRESSION
NUT
ORIFICE
_ OLENOID
VALVE
INLET
90 1053
IN-LINE
STRAINER
'C O%RESS,ON
NUT
1. Disconnectelectricalpowerto the HVAC
andshutoff water supply.
2. Disconnectthe water line at the inlet
compressionnut.
3. Removethe in-line strainer from inside
the inlet sideof the valvebyusinga small
nail orwire.
4. Flushthe in-line strainercleanor replace
with a new strainer,PartNo. 4004.
5. Reconnectthe inlet water line. Double
Wrench to PreventLeaking.
6. Disconnectthe water feed tube at the
outlet compressionnut.
7. Inspect the water feed tube by gently
flexing it andlookingfor cracksorsignsof
wear. Replacetubeif it iscracked,brittle,
orhasbeendamaged.
8. Inspectthe orifice in the water feed tube
and make sure the small opening is
unplugged.
9. Reconnectthe waterfeed tube. Double Wrench to Prevent Leaking.
10.Removethedrainlinefromthebottomof thehumidifier.If applicable,flex it
to loosenanymineraldepositsorblockages.Flushthe drainlinewith water
underpressureto clearit of anydebris,andslipit backontothedrainfitting.
If drainlinedoesnotflow properly,replaceit. Inspectthedrainlineto make
sure it has a constantdownwardslope and is not flattened or blocked.
11. Turn on water supply and reconnect electrical power to the HVAC.
- 12 - - 13-
1. Inlet Grille
2. Distribution Tray
3. Scale Control Insert
4. Distribution Tray Cover
5. Water Panel Evaporator
6. Drain Spud
7. Power Cord
8. Metal Housing
9. Water Panel
Evaporative Assembly
1. Note Manual Humidifier Control setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Remove inlet grille screws (1). Remove grille from metal housing (8).
4. Lift the Water Panel evaporative assembly (9) out of the humidifier housing (8).
5. To remove the distribution tray (2) from Water Panel evaporative assembly (9), push down
on tray and pull out scale control insert (3). To clean the "V" openings of the tray, gently pry
the distribution tray cover (4) from the tray. Lightly scrape out or brush off any mineral
deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaldng the tray in
vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral
deposits.
6. Slide the Water Panel evaporator (5) out from the scale control insert (3) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No. 35) with a Genuine Aprilaire Water Panel. Slide the Water Panel back
into the scale control insert (3) and snap the distribution tray cover (4) into the distribution
tray (2). Then snap the distribution tray back into the scale control insert.
7. Inspect the plastic feed tube by gently flexing it and Iooldng for cracks or signs of wear.
Replace tube if it is cracked, brittle or has been damaged.
8. Remove the drain line from the bottom of the humidifier and flex it to loosen any mineral
deposits or blockage. Then flush it with water under pressure. If it does not properly clear,
replace it. Slip the drain line back onto the drain fitting (6). Make sure the drain line has a
constant downward slope and is not flattened or blocked.
9. Reinstall Water Panel evaporative assembly (9) and intake grille (1).
10.Reconnect electrical power (7)and turn on water supply.
11.Turn up Manual Humidifier Control and check system operation.
12.Set Manual Humidifier Control to its original position.
-14-
REQUIREDMAINTENANCE iNSTRUCTiONS
(APRiLAIREHUMiDiFiERMODELS400A& 400M)
CAUTION
90 1077
2. Turn off water supply. Turn the integral bypass damper (3) to the "SUMMER" position.
3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base
with both hands.
4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water
Panel evaporative assembly (4). Tip the Water Panel evaporative assembly forward and lift it
out of the humidifier. De not tip the Water Panel evaporative assembly more than needed to
clear the housing to avoid over-bending the water level sensor assembly (12).
5. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush
off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner.
Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove
stubborn mineral deposits.
6. Slide the used Water Panel evaporator (7) out of the scale control insert/float chamber and
dispose of the Water Panel.
7. Remove the float cover (10)and inspect the floats (11)and float chamber for mineral build-up.
Remove deposits as needed from floats, float chamber and scale control insert. Wash the
parts with a disinfecting cleaner. Reassemble the floats and float cover. Make sure stems of
both floats extend through openings in float cover and that floats move freely up and down.
8. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
9. Slide a new Aprilaire No. 45 Water Panel evaporator (7) into the scale control insert!float
chamber (8). Snap the distribution tray (5) back on the scale control insert (8).
10. Reinstall the Water Panel evaporative assembly (4)into the humidifier. Take care not to over-
bend the water level sensor assembly. Push the top of the Water Panel evaporative assembly
firmly back until it snaps into place.
11. Push the end of the feed tube back firmly into the distribution tray. Replace the front cover.
12. Under normal operation the overflow drain line (9) will never have water in it. However,
inspect it for mineral deposits and replace if necessary. Make sure the drain line has a
constant downward slope and is not flattened or blocked.
13.Turn on the water supply. Return integral bypass damper to appropriate position.
14. Check system operation:
Manual Humidifier Control (Model 4geM): With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Model 4OOA):(Automatic or Manual mode) Check
system operation and reset Change Water Panel indicator by setting the knob to
"Test!Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DO NOT LEAVEIN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
15. Set Humidifier Control to its original position.
-15-
1. Inlet Grille
2. Distribution Tray
3. Scale Control Insert
4. Distribution Tray Cover
5. Water Panel Evaporator
6. Drain Spud
7. Power Cord
8. Metal Housing
9. Water Panel
Evaporative Assembly
1. Note Manual Humidifier Control setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Remove inlet grille screws (1). Remove grille from metal housing (8).
4. Lift the Water Panel evaporative assembly (9) out of the humidifier housing (8).
5. To remove the distribution tray (2) from Water Panel evaporative assembly (9), push down
on tray and pull out scale control insert (3). To clean the "V" openings of the tray, gently pry
the distribution tray cover (4) from the tray. Lightly scrape out or brush off any mineral
deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaldng the tray in
vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral
deposits.
6. Slide the Water Panel evaporator (5) out from the scale control insert (3) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No. 35) with a Genuine Aprilaire Water Panel. Slide the Water Panel back
into the scale control insert (3) and snap the distribution tray cover (4) into the distribution
tray (2). Then snap the distribution tray back into the scale control insert.
7. Inspect the plastic feed tube by gently flexing it and Iooldng for cracks or signs of wear.
Replace tube if it is cracked, brittle or has been damaged.
8. Remove the drain line from the bottom of the humidifier and flex it to loosen any mineral
deposits or blockage. Then flush it with water under pressure. If it does not properly clear,
replace it. Slip the drain line back onto the drain fitting (6). Make sure the drain line has a
constant downward slope and is not flattened or blocked.
9. Reinstall Water Panel evaporative assembly (9) and intake grille (1).
10.Reconnect electrical power (7)and turn on water supply.
11.Turn up Manual Humidifier Control and check system operation.
12.Set Manual Humidifier Control to its original position.
-14-
REQUIREDMAINTENANCE iNSTRUCTiONS
(APRiLAIREHUMiDiFiERMODELS400A& 400M)
CAUTION
90 1077
2. Turn off water supply. Turn the integral bypass damper (3) to the "SUMMER" position.
3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base
with both hands.
4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water
Panel evaporative assembly (4). Tip the Water Panel evaporative assembly forward and lift it
out of the humidifier. De not tip the Water Panel evaporative assembly more than needed to
clear the housing to avoid over-bending the water level sensor assembly (12).
5. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush
off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner.
Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove
stubborn mineral deposits.
6. Slide the used Water Panel evaporator (7) out of the scale control insert/float chamber and
dispose of the Water Panel.
7. Remove the float cover (10)and inspect the floats (11)and float chamber for mineral build-up.
Remove deposits as needed from floats, float chamber and scale control insert. Wash the
parts with a disinfecting cleaner. Reassemble the floats and float cover. Make sure stems of
both floats extend through openings in float cover and that floats move freely up and down.
8. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
9. Slide a new Aprilaire No. 45 Water Panel evaporator (7) into the scale control insert!float
chamber (8). Snap the distribution tray (5) back on the scale control insert (8).
10. Reinstall the Water Panel evaporative assembly (4)into the humidifier. Take care not to over-
bend the water level sensor assembly. Push the top of the Water Panel evaporative assembly
firmly back until it snaps into place.
11. Push the end of the feed tube back firmly into the distribution tray. Replace the front cover.
12. Under normal operation the overflow drain line (9) will never have water in it. However,
inspect it for mineral deposits and replace if necessary. Make sure the drain line has a
constant downward slope and is not flattened or blocked.
13.Turn on the water supply. Return integral bypass damper to appropriate position.
14. Check system operation:
Manual Humidifier Control (Model 4geM): With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Model 4OOA):(Automatic or Manual mode) Check
system operation and reset Change Water Panel indicator by setting the knob to
"Test!Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DO NOT LEAVEIN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
15. Set Humidifier Control to its original position.
-15-
REQUIREDMAINTENANCE iNSTRUCTiONS
(APRiLAIRE HUMiDiFiER MODELS 500A, 500M, 600A & 600M)
CAUTION
1. Front Cover
2. Feed Tube
3. Integral Bypass Damper
4. Water Panel
Evaporative Assembly
5. Distribution Tray
6. "V" Notches
7. Water Panel Evaporator
8. Scale Control Insert
9. Drain Line
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.
3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base
with both hands. Set aside.
4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water
Panel evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush
off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner.
Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove
stubborn mineral deposits.
6. Slide the Water Panel evaporator (7) out from the scale control insert (8) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No.35 for Models 600A & 600M and Stock No. 10for Models 500A & 500M)
with a new Genuine Apfilaire Water Panel. Slide the Water Panel evaporator back into the
scale control insert with the colored spot up and snap the distribution tray (5) back into place.
7. Inspect the plastic feed tube (2) by gently flexing it and Iooldng for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
8. Reinstall the Water Panel evaporative assembly (4)into the humidifier by fitting its drain into
the round receptacle at the base of the humidifier. Push the assembly in at the top until it
snaps into place. Push the end of the feed tube back firmly into the distribution tray and
replace the front cover.
9. Remove the drain line (9) from the bottom of the humidifier. If applicable, flex it to loosen any
mineral deposits or blocl(age. Then flush it with water under pressure. If it does nut properly
clear, replace it. Slip drain line back onto the drain fitting. Make sure the drain line has a
constant downward slope and is not flattened or blocked.
10.Turn on the water supply. Return integral bypass damper to appropriate position.
11. Check system operation:
Manual Humidifier Control (Models 500M& 60OM):With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Models 5OOA& 6OOA):(Automatic or Manual mode)
Check system operation and reset Change Water Panel indicator by setting the knob to
"Test/Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DONOT LEAVEIN TESTMODE AS HUMIDIFIER WILL NOT OPERATE.
12. Set Humidifier Control to its original position.
1. Humidifier Cover
Assembly
2. Base Assembly
3. Water Panel
Evaporative Assembly
4. Distribution Tray
5. "V" Notches
6. Water Panel Evaporator
7. Scale Control Insert
8. Drain Line
9. Power Cord
90 1075
®
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidifier front cover assembly (1)from base assembly(2) atthe bottom of the cover,
lift, and set aside.
4. Pull out the Water Panel evaporative assembly (3) by grasping at the top and tipping out.
5. Unsnapthe distribution tray (4)from the scale control insert (7).Lightly scrape out or brush off any
mineral deposits, being careful notto stretch or loosen the synthetic fabric liner. Soaking the tray
in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.
6. Slide the Water Panel evaporator (6) out from the scale control insert (7) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No. 35) with a new Genuine Aprilaire Water Panel. Slide the Water Panel
evaporator back into the scale control insert with the colored spot up and snap the
distribution tray (4) back into place.
7. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
8. Reinstall the Water Panel evaporative assembly (3)into the humidifier by fitting its drain into
the round receptacle at the base of the humidifier. Push the assembly in at the top between
the retaining ribs that hold the assembly in place in avertical position.
9. Remove the drain line (8) from the bottom of the humidifier. If applicable, flex it to loosen any
mineral deposits or blockage. Then flush it with water under pressure. If it does not clear,
replace it. Slip drain line back onto the drain fitting. Make sure the drain line has a constant
downward slope and is not flattened or blocked.
10. Reinstall front cover assembly (1) by hooking atthe top of the base assembly (2) and latching
at the bottom.
11. Reconnect electrical power (9) andturn on the water supply.
12. Check system operation:
Manual Humidifier Control (Model 7O0M): With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Model 7OOA):(Automatic or Manual mode) Check
system operation and reset Change Water Panel indicator by setting the knob to
"Test/Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DO NOT LEAVEIN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
13. Set Humidifier Control to its original position.
NOTE:The motor is permanently lubricated and does not need to be oiled.
- 16- - 17 -
REQUIREDMAINTENANCE iNSTRUCTiONS
(APRiLAIRE HUMiDiFiER MODELS 500A, 500M, 600A & 600M)
CAUTION
1. Front Cover
2. Feed Tube
3. Integral Bypass Damper
4. Water Panel
Evaporative Assembly
5. Distribution Tray
6. "V" Notches
7. Water Panel Evaporator
8. Scale Control Insert
9. Drain Line
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.
3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base
with both hands. Set aside.
4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water
Panel evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush
off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner.
Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove
stubborn mineral deposits.
6. Slide the Water Panel evaporator (7) out from the scale control insert (8) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No.35 for Models 600A & 600M and Stock No. 10for Models 500A & 500M)
with a new Genuine Apfilaire Water Panel. Slide the Water Panel evaporator back into the
scale control insert with the colored spot up and snap the distribution tray (5) back into place.
7. Inspect the plastic feed tube (2) by gently flexing it and Iooldng for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
8. Reinstall the Water Panel evaporative assembly (4)into the humidifier by fitting its drain into
the round receptacle at the base of the humidifier. Push the assembly in at the top until it
snaps into place. Push the end of the feed tube back firmly into the distribution tray and
replace the front cover.
9. Remove the drain line (9) from the bottom of the humidifier. If applicable, flex it to loosen any
mineral deposits or blocl(age. Then flush it with water under pressure. If it does nut properly
clear, replace it. Slip drain line back onto the drain fitting. Make sure the drain line has a
constant downward slope and is not flattened or blocked.
10.Turn on the water supply. Return integral bypass damper to appropriate position.
11. Check system operation:
Manual Humidifier Control (Models 500M& 60OM):With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Models 5OOA& 6OOA):(Automatic or Manual mode)
Check system operation and reset Change Water Panel indicator by setting the knob to
"Test/Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DONOT LEAVEIN TESTMODE AS HUMIDIFIER WILL NOT OPERATE.
12. Set Humidifier Control to its original position.
1. Humidifier Cover
Assembly
2. Base Assembly
3. Water Panel
Evaporative Assembly
4. Distribution Tray
5. "V" Notches
6. Water Panel Evaporator
7. Scale Control Insert
8. Drain Line
9. Power Cord
90 1075
®
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidifier front cover assembly (1)from base assembly(2) atthe bottom of the cover,
lift, and set aside.
4. Pull out the Water Panel evaporative assembly (3) by grasping at the top and tipping out.
5. Unsnapthe distribution tray (4)from the scale control insert (7).Lightly scrape out or brush off any
mineral deposits, being careful notto stretch or loosen the synthetic fabric liner. Soaking the tray
in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.
6. Slide the Water Panel evaporator (6) out from the scale control insert (7) and dispose of the
Water Panel. Clean the scale control insert of mineral deposits. Replace the Water Panel
evaporator (Stock No. 35) with a new Genuine Aprilaire Water Panel. Slide the Water Panel
evaporator back into the scale control insert with the colored spot up and snap the
distribution tray (4) back into place.
7. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
8. Reinstall the Water Panel evaporative assembly (3)into the humidifier by fitting its drain into
the round receptacle at the base of the humidifier. Push the assembly in at the top between
the retaining ribs that hold the assembly in place in avertical position.
9. Remove the drain line (8) from the bottom of the humidifier. If applicable, flex it to loosen any
mineral deposits or blockage. Then flush it with water under pressure. If it does not clear,
replace it. Slip drain line back onto the drain fitting. Make sure the drain line has a constant
downward slope and is not flattened or blocked.
10. Reinstall front cover assembly (1) by hooking atthe top of the base assembly (2) and latching
at the bottom.
11. Reconnect electrical power (9) andturn on the water supply.
12. Check system operation:
Manual Humidifier Control (Model 7O0M): With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Automatic Digital Humidifier Control (Model 7OOA):(Automatic or Manual mode) Check
system operation and reset Change Water Panel indicator by setting the knob to
"Test/Reset" With HVAC blower operating and HVAC calling for heat, humidifier will operate
for one minute. DO NOT LEAVEIN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
13. Set Humidifier Control to its original position.
NOTE:The motor is permanently lubricated and does not need to be oiled.
- 16- - 17 -
Your Research Products Corporation Aprilaire ®humidifier unit is expressly warranted for five (5)
years from date of installation to be free from defects in materials or workmanship except,
however, for the disposable Water Panel which will have to be replaced from time to time
depending upon the amount of use.
Research Products Corporation's exclusive obligation under this warranty shall be to supply,
without charge, a replacement for any part of the humidifier which is found to be defective within
such five (5)year period and which is returned not later than thirty (30)days after said five (5)year
period by you to either your original supplier or to Research Products Corporation, Madison,
Wisconsin 53701, together with the model number and installation date of the humidifier.
THISWARRANTY SHALLNOT OBLIGATERESEARCHPRODUCTSCORPORATIONFORANY LABOR
COSTSAND SHALL NOTAPPLYTO DEFECTSIN WORKMANSHIP OR MATERIALS FURNISHEDBY
YOURINSTALLERAS CONTRASTEDTO DEFECTSIN THE HUMIDIFIER ITSELF.
IMPLIEDWARRANTIES OFMERCHANTABiLiTYOR FITNESSFORA PARTICULARPURPOSESHALL
BE LIMITED IN DURATION TO THE AFORESAD FiVE YEAR PERIOD,RESEARCHPRODUCTS
CORPORATION'SLIABILITY FOR INQDENTAL OR CONSEQUENTIALDAMAGES, OTHERTHAN
DAMAGES FOR PERSONALINJURIES, RESULTINGFROM ANY BREACH OF THE AFORESAID
IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY iS EXPRESSLYEXCLUDED,THIS
LIMITED WARRANTY iS VOiD IF DEFECT(S)RESULT FROM FAILURETO HAVE THiS UNIT
INSTALLEDBYA QUALiFiEDHEATINGAND AIR CONDiTIONiNGCONTRACTOR.IFTHE LiMiTED
WARRANTYIS VOiDDUETO FAILURETOUSEA QUALIFE!DCONTRACTOR,ALL DISCLAIMERSOF
IMPLIED WARRANTIESSHALL BE EFFECTIVEUPONiNSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or
limitation of incidental or consequential damages so the above exclusion or limitations may not
apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.
Visit us on-lineat www.aprilaire.com to registeryourAprilaireproduct.
If youdo nothaveon-lineaccess,pleasemail a postcardwith yourname,address,
phonenumber,modelnumberofproductpurchasedanddateof installationto:
ResearchProductsCorporation,P.O.BOX1467,Madison,Wl 53701
i
YourWarranty Registrationinformation
will not be son or sharedoutsideofthis company,
Thank you!
10008313 10.08
B2204702A
RESEARCHPRODUCTSCORPORATION
POBOX1467* MADISON,Wl 53701-1467
-18-
rid)2008Research Products Corporation
