Install Instructions

Installation
19│Page
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Donotusethiswaterheaterifanyparthasbeensubmersedunderwater.Immediatelycalla
licensedprofessionaltoinspectthewaterheaterandtoreplaceanydamagedparts.
WATERCONNECTIONS
1. All pipes, pipe fittings, valves and other compon ents, including solderi ng materials, must be
suitableforpotablewatersystems.
2. Amanualshutoffvalvemustbe install edonthecol dwaterinlettothewaterheaterbetweenthe
mainwatersupplylineandtheT‐H2‐DV/T‐H2‐OS.
3.
Inaddition,amanualshutoffvalveisalsorecommendedonthehotwateroutletoftheunit.Ifthe
T‐H2‐DV/T‐H2‐OS is installed within, or subjected to, a  closed loop water system, a thermal
expansiontankmustbeinstalled.
4. Before installing the water heater, flush
the water line to remove all debris, and after
installationiscomplete, purgetheairfromtheline.Failuretodosomaycausedamageto the
heater.
5. Thereisawiremeshfilterwithinthe coldinlettotrapdebrisfromenteringyourheater.Thiswill
needtobe
cleanedperiodicallytomaintainflow.
BasedonEnergyContentof1000BTU/CubicFt:
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Divideeachappliance’sBTUrequirementby1000BTUtoget
theappliancesCubicFt.requirement.
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Takagiintoaccountthedistancetheapplianceisfromthegas
meter,lookintheabovegascharttoproperlysizetheline.
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Forsectionsofthegaslinesupplyinggastomorethanone
appliance(Ex:PointAtoPointB),addupthecubicft.
requirementsoftheappliancesthatarebeingsuppliedbythat
section,andsizetothefarthestappliance.
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ForExample:ThesectionfromAtoBsuppliesgastothe
furnace,range,anddryer.AddinguptheBTUrequirements
anddividingby1000yieldsacubicft.requirementof220
cubicft.ofgas.Thefarthestapplianceistherange,whichis50
ft.awayfromthemeter.Lookingattheabovechart,and
underthecolumnof50ft.,SectionAtoBneedstobe 1”in
ordertosupply220cubicft.
Donotreversethehot
outletandcoldinlet
connectionstotheT‐H2‐
DV/T‐H2‐OSWaterHeater.
Thiswillnotproperlyactive
thewaterheater.
FORYOURSAFETY,READBEFOREOPERATING:
10’Length
1”PipeSize
C
GasSizingExample
(NaturalGas)
10’Length
3/4”PipeSize
15’Length
1/2”PipeSize
10’Length
1/2”PipeSize
Furnace
120,000BTU
T‐H2‐DV/
T‐H2‐OS
199,000BTU
5’Length
1‐1/4”PipeSize
Range
65,000BTU
10’Length
3/4”PipeSize
Dryer
35,000BTU
15’Length
1”PipeSize
5’Length
1‐1/4”PipeSize
GasMeter
B
A
CAUTION
Condensate drainport
Wateroutlet
(HOT)
Waterinlet
(COLD)
GAS inlet