Specifications

TroubleshootingGuide
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31|Page
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REPLACINGTHEHEATEXCHANGER
Contaminated air with a  high level of dust, lint, sand, grease, aerosols or other contaminants, can
become airborne and enter the air intake.The contaminants build up within the fan and burner
assemblycausingabnormalflame conditionsduetolackofcombustionair,damagingmanycomponents
oftheunit.
Scalecan
buildupfromveryhardwater.Limescalewillformontheinsideoftheheatexchangertubes
readilyathightemperatures.Thisscaleprohibitshe atfromreachingthewaterwhichcausesexcessive
heatwithintheheatexchangercopper,anditwilleventuallyburnandleak.
Alongwithchangingthe
heatexchanger,itisimportanttoidentifytheCAUSEoftheneedfor
replacement,andfixtheproblemsoitdoesnotoccuragain
1) TOOLS
‐Gatherthefollowingmaterialstogether:
a. Degreaserinapumpactionbottle
b. Sheetof100GritSandpaper
c. #2PhilipsScrewDriver
d. Needle‐NosedPliers
e. DuctTape
f. Flashlight
g. AirCompressor
h. OldTowels,atLeastThree
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2) PREPARETHEUNIT
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a. POWER
‐Disconnectpowertoyourunit.
b. GAS
‐Shutoffthegassupplytotheunit.
c. WATER
–Draintheunit.Refertop.23forinstructions.
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3) REMOVEPCBOARD,MANIFOLD/GASASSEMBLY,BURNER
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a. Followsteps1‐7oftheprevioussection,“Cleaningthe
CombustionComponents”.Thiswilltellyouhowto
removethePCB,manifold/gasassembly,andburner
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4) WIRES
‐Thereareseveralwireclipsthatneedtoberemovedtofreetheheatexchanger
a. Ontheleftside,disconnecttheblackandwhiteclipswithbluewires
b. Ontherightside,disconnectthehotwaterthermistorblackclipandtheheatingelementwhite
andblueclips.
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5)
FAN
a. Thefanisheldinbytwoscrews.Theyfacethebottomoftheheater,andcanbereachedby
twoholesinthebottomofthecasewithalongscrewdriver.
b. Slideitlefttoreleaseitfromthegrooves.
Figure34