A.O. Smith 310 - Heat Exchanger

TroubleshootingGuide
28|Page
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9) COMBUSTIONCHAMBER
‐Inspectthecombustion
chamberwithabrightflashlight.
a. Removetheexhaustventingfromtopoftheunit
fortheDVmodel
b. Placeonetowelatthebottomofthecombustion
chamber,protectingthedischargeofthefan(fan
port),aswellasdrapeanothertowelcoveringthe
square
openingofthecombustionchamber(to
preventairbornedebris)
c. Turnontheshopvacuumandvacuumallofthedirt
fromthecombustionchamber.
d. Atthesametime,withtheaircompressor,blowair
downthroughthetopoftheheatexchanger
throughtheventcollartoremoveadditional
contaminants.
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10) HEATEXCHANGER
‐Ifthereisawhite,crustysolidbuildupintheheatexchanger,pleasecontactthe
TechnicalServiceDepartmentforfurther
instruction.
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11) SENSORS
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a. CleantheflamesensorandAFRwith
sandpaper,thoroughlytoabrightfinish.
Itisimportanttobeverygentilewiththe
sensorrodswhilecleaningthem,asthey
willeasilybendoutofplace.Theiroriginal
positionrelativetotheburnerneedstobe
unalteredinorder
tofunctionproperly.
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12) REASSEMBLE
‐Reassembletheunitinreverse
order.Keypointstoremember:
a. Inspectallofthegaskets.
b. BeawareoftheblackO‐ringandmeshfilteronthegasvalveinlet.
c. Reconnecttheplastictube fromthegasvalvetothebottomofthecombustionchamber.
d. Reattach
allcomponentsthatthemanifoldscrewssecureintheirplaces.
e. Reconnectallwirestothecomputerboardandanyotherclips.
f. Donothaveanyscrewsleftover.
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Figure29
Figure30