Takagi T?K4?IN - INTRODUCTION

Introduction
4│Page
INTRODUCTION
*Thisdiagram
illustratestankless
waterheaterdesign
conceptsonlyand
doesnotaccurately
representtothewater
heater’sphysical
description.
• This manual provides information necessary for the installation, operation, and
maintenanceofthewaterheater.
• Themodeldescriptionislistedontheratingplatewhichisattachedtothefront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 the
manufactureroritslocalrepresentative.
• Thisequipmentisanon‐demand,tanklesswaterheaterdesignedtoefficientlysupply
endlesshotwaterforyourneeds.
• Theprinciplebehindtanklesswaterheaters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initia testhefanmotorandsendsasignaltotheignitertocreateanignition
spark.
5. Thegasignitesandflames
appearwithintheburnerchamber.
6. Watercirculatesthroughtheheatexchangerandthengetshot.
7. Usingthermistorstomeasuretemperaturesthroughoutthewaterheater,thecomputer
modulatesthegasandwatervalvestoensureproperoutputwatertemperature.
8. Whentheta
p
isturnedoff
,
theunitshutsdown.
• The T‐KJr2‐IN, T‐K4‐IN, & T‐D2‐IN are to be only installed indoor (direct‐vent
convertible).TheT‐KJr2‐OS,T‐K4‐OS,&T‐D2‐OSaretobeonlyinstalledoutdoor.