Harman Accentra Pellet Insert - Low Draft Voltage Adjustment

19
3-90-00674R28_12/13
Theseunitsarepre-testedatthefactorywithexactly120VAC,
60Hz.Theyarecheckedandadjustedforreboxtightness,
gasketleakage,motoroperationandigniteroperation.The
stoveisthenfactorysetatahighadjustment.NOTE: Low
draft adjustment may be required. The factory low draft
setting may not be correct for the unit's permanent
installation conditions.
ThecontrolboardontheAccentraInsertisequippedwitha
lowdraftadjustmentport.Locatedonthecontrolfacejust
totherightoftheigniterlight.SeeFigure44.Thisvoltage
adjustmentisprovidedtoallowtheunittobeadjustedforthe
householdvoltagewheretheunitisgoingtobeinpermanent
operation.NOTE:Thelinevoltagevariesfromareatoarea
andoftenhometohome.
Thelowdraftvoltageshouldbeadjustedtoachievethemost
efcient burn on low burn or "maintenance". This voltage
adjustment allows the installer to change the low voltage
set point approximately 15 volts. Thisadjustment should
bedonebytheinstallerduringsetupbecauseadraftmeter
readingisrequired toinsurepropersetup.
Iftheunitisnotadjustedproperly,itdoesnotcauseasafety
concern.Iftheunitisadjustedtoohigh,onlyefciencyislost.
Iftheunitisadjustedtoolow,thelowdraftpressureswitch
willnotallowthefeedermotorortheignitertooperate.
Aftertheinstallationiscompleted,butbeforetherstreislit,checkandrecordthe
highandlowdraftreadings.
Asimpledrafttestshouldbeperformedaftercompletingthe
uepipeinstallation.Torecordtheresultsforfuturereference:
1. Plugunitintoa120VAC,60Hzoutlet.
2. Closethehopperlidandfrontviewdoor.Neitherpellets
orarearerequiredforthistest.
3. Withthemodeselectorinthe"OFF"position,turnthefeed
adjusterto"TEST".
4. Record the high draft_____in. W.C. (Normal is -.45 to
-.55)ThecontrolwillbeontheHighDraftforatotalof1
minute.
5. After1minute,thecombustionmotorwillgodowntolow
draft and the distribution blower will go on high.Allow
approximately 15 seconds to pass for the combustion
motortoslowbeforecheckingthelowdraft.
6. Ifthelowdraftisbetween.30and.35,recordthereading
_____in.W.C.Ifthereadingishigher,slowlyturnthe
setscrewcounter-clockwiseuntilthedraftlowers.Ifthe
readingislower,veryslowlyturnthesetscrewclockwise
untilthedraftincreases.
NOTE: In some cases, the draft may not go as low as .30
even with the set screw completely counter-clockwise.
Combustion Motor
Speed Control
Low draft only set
point.
The small straight
screwdriver slot is
plastic; therefore,
the unit can be
adjusted while in
operation.
Fig.44
Draft Meter bolt hole location
Theheadoftheplugboltcanbeaccessedthroughthebottom
distributionairinletwiththecastashlipremoved.
Fig.45
Low Draft Voltage Adjustment