86
MaincomponentsReplacementInstructions
1.Closethegasshutovalve.
2.Turnthepowero.
3.
Placeabucketundertheunitandragaroundpump
tocollecttheresidualwaterfromthewaterheater.
4.Disconnecttheelectricalpowertothewaterheater.
5.ClosetheDHWinletvalve.
6.Drainwaterfromthehotwater&DHWloop.
7.Removewireconnectorconnectedtocirculation
pump.
8.LoosenthenutonthepumpandHEXpipe,loosen
wiretie.
AnddisconnecttheconnectorforHighLimitSwitch
andHEXThermistor.
10.RemovethecirculationpumpwiththeHEXwater
pipeinthedirectionofthearrow.
11.RemoveHEXwaterpipefromthepump.
12.Replacethepumpwithnewpart.
Checktheo-ringsfordamage,ifdamaged,replace
withnewo-rings.
13.Assembleinthereverseorderasthepartwas
removed.
14.Openthegasshutovalve.
15.Turnthepoweron.
16.Openwatervalves(HotwaterandDHW).
17.Turntheunitonandensureproperoperation.
NOTE
1.Checkwireconditionconnectedtopump.
2.Makesuretheo-ringisinsertedcorrectlywhen
assemblingthepipe.
Chapter5ReplacementInstructions
9.CirculationPump
9.Usingahandscrewdriver,removethreescrews
onthepumpxingbracketandremovetheclipto
separatepumpfromtheHEXwaterpipe.