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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:



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

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.

Takagi T?K4?IN User Manual

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