Installation Manual

Installation
26│Page
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PUMPCONTROLMODES
TheT‐H2‐DV/T‐H2‐OSprovidesthefourtypesofthepumpcontrol
modes.Thepumpcontrolmodes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T‐H2‐DV/T‐H2‐OS.(See
right.)These4modesonlyaffectpumpsthatareconnectedto
theT‐H2‐DV/T‐H2‐OSpumpcontrol(p.25)
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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T‐H2‐DV/T‐H2‐OS.
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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 T‐H2‐DV/T‐H2‐OS 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 T‐H2‐DV/T‐H2‐OS 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T‐H2‐DV/T‐H2‐OS.
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Rightbankofdipswitches