Install Instructions

Installation
25│Page
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PUMPCONTROLMODE
Thewaterheaterprovidesthefourtypesofthepumpcontrol
modes.Thepu mpcontrolmode sareselectedbychanging
dipswitchsettings.Thedipswitchesthatchangethepumpcontrol
modesarelocatedintherightbankofdipswitchesintheupper‐
leftquadrantofthecomputerboardinthewaterheater.
(See
right.)These4modesonlyaffectpump sthatareconnectedto
thewaterheaterpumpcontrol(p.24)
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A)RecirculationControl:No.5ON
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Feature:Maintainingtemperatureinastandardrecirculationloop,providinghotwaterinaquicker
amountoftime.
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Function:Thepumpisonlysettorunwhenthetemperatureofthewaterintherecirculationloopis
morethan9°Fbelowthesettemperatureofthewaterheater.
Thepumpwill
runforabout1minuteevery30minutestodeterminewhetherthewater
temperatureintheentirerecirculationloopismorethan9°Fbelowthesettemperature.
Ifthewatertemperatureismorethan9°Fbelowthesettemperature,thepumpwillremainrunning
untilthewaterintheloop 
reachesthesettemperature.Otherwise,thepumpwillstopforanother
30minutes.
Iftheinletthermistorofwaterheatersdetectsthatthewatertemperatureismorethan9°Fbelow
thesettemperaturebeforethose30minuteshaveelapsed,thepumpwillactivateimmediatelyand
remainrunninguntilthewaterin
theloopreachesthesettemperature.
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B)StorageTankCirculationControl:No.6ON
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Feature:Thisistoensureahigherrateofrecoveryforstoragetankapplications.
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Function: The water heater heats the water 5.4°F higher than its set temperature. The circulation
pump between the storage tank and the water heater will continually remain running. After set
temperaturehasbeenreachedinthe
storagetank,thewaterheaterwillfireoffandlimitthewater
flowratetolessthan2.6GPM,tocontinuallymonitorthetemperaturethroughoutthesystem.
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Note:Inthismode,thepumpwillcontinuallyremainrunning.
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C)EnergyConservingRecirculation:No.5andNo.6ON
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Feature:OperatessimilarlytothestandardRecirculationControlmode,butsavesmoreenergyby
limitingthetemperaturewithintherecirculationloop.
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Function:Thetemperatureoftherecirculationloopisneverkeptabove120°F(49°C),regardlessof
thesettemperatureofthewaterheater.
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Rightbankofdipswitches