Specifications

TroubleshootingGuide
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35|Page
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DESCALINGTHEUNIT
Hardwaterisasevereproblemforthecoppercoilsinsideheatexchangers.Heatexchangerfailuredue
toscalebuildupfromhardwaterconditionsisNOTcoveredbywarranty.Itishighlysuggestedthata
scaleinhibitorbeinstalledbeforethecoldwaterinletafterthisprocedureisdone.
1) TOOLS
‐Gatherthefollowingmaterialstogether:
a. Pump:Thepumpshouldprovideaminimumof
1GPMthroughtheheater
b. CleaningSolution:Foodgradecitricacid,food
gradephosphorusacid
c. Waterhoses
d. Bucket
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2) SETUP
‐Disconnectpowertotheunit
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3) WATERLINES
–Assumesisolationvalveswithdrain
portsareinstalled
a. Isolatetheunitbyclosingtheincoming/outgoing
waterisolationvalvesCandD.
b. Connecthoses/pumptothedrainportsofthe
isolationvalves:OutletofthepumptovalveB,
andanotherhosefromValveAtothebucket.
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4) PUMP
–
a. Fillthebucketwith5gallonsofdilutedsolution.
Dilutionratiodependsonthecleaningsolution
used.
b. Placethepumpintothebucketifitis
submersible,oruseaninlethoseintothebucket
ifitisnotsubmersible.
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5) DESCALE
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a. OpenvalvesAandB.
b. Circulatedescalingsolutionthroughtheunitfor45minutes.
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6) CLEANSETHESYSTEM
–Flushthechemicalsoutoftheheatexchangerwithfreshwater.
a. ClosevalveAandB.
b. OpenvalveDandrunfreshwaterthroughthePRVfor15minutes.
c. Cleanthefilterafterflushingtheunitwithfreshwater.
d. Oncetheunitisflushedandcleansed,closeAandB,openCandD,andreconnectpowertothe
unit.
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321922‐000
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Figure41