Installation Manual

Introduction
3│Page
INTRODUCTION
*Thisdiagram
illustratesTakagi’s
tanklesswaterheater
designconceptsonly
anddoesnot
accuratelyrepresent
totheT‐H2‐DV/T‐H2‐
OS’sphysical
description.
• This manual provides information necessary for the installation, operation, and
maintenanceoftheT‐H2‐DV/T‐H2‐OSwaterheater.
• Themodeldescriptionislistedontheratingplatewhichisattachedtothesidepanelof
thewaterheater.
• Pleasereadallinstallationinstructionscompletelybeforeinstallingthisproduct.
• Ifyouhaveanyproblemsorquestionsregardingthisequipment,consultwithTakagior
itslocalrepresentative.
• TheT‐H2‐DV/T‐H2‐OSWaterHeaterisanon‐demand,tanklesswaterheaterdesigned
toefficientlysupplyendlesshotwaterforyourneeds.
• TheprinciplebehindtheT‐H2‐DV/T‐H2‐OSWaterHeaterissimple:
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1. Ahotwatertapisturnedon.
2. Waterenterstheheater.
3. Thewaterflowsensordetectsthewaterflow.
4. Thecomputerautomaticallyignitestheburner.
5. Watercirculatesthroughtheheatexchangerandthengetshot.
6. Thecomputerwillmodulatethe
gassupplyvalveandwaterflowtoproducetheright
amountofhotwateratthecorrecttemperature.
7.
When

the

tap

is

turned

off,

the

unit

shuts

down.
• The T‐H2‐DV/T‐H2‐OS are high efficiency models with an in‐build secondary heat
exchangerthatabsorbslatentheatfromtheexhaustgas.
Burner
Condensate
drainport
Secondaryheatexchanger
Thermistor
Thermistor
GasValve
Flowsensor
Watercontrolvalve
B
yp
assvalve
Intake
p
ort
Exhaust
Fanmotor
Primaryheat
exchanger
Thermistor
PCB
HotWaterOutlet
ColdWaterOutlet
Gas