Introduction - Takagi T‐KJr2‐IN Installation Manual And Owner's Manual

INTRODUCTION

• 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 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.
• 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 initiates 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 tap is turned off, the unit shuts down.
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Page
Introduction
*This diagram
illustrates tankless
water heater design
concepts only and
does not accurately
represent to the water
heater's physical
description.