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Takagi T-KJr2-IN - User Manual

Takagi T-KJr2-IN
52 pages
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-Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
-WHAT TO DO IF YOU SMELL GAS
. Do not try to light any appliance.
Do not touch any electric switch, do not
use any phone in your building.
Immediately call your gas supplier from a
neighbor's phone. Follow the gas
supplier's instructions.
If you cannot reach your gas supplier, call
the fire department.
-Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
FEATURING
ENDLESS HOT WATER
ON DEMAND USAGE
COMPACT, SPACE SAVING
ENERGY CONSERVATION
COMPUTERIZED SAFETY
NO PILOT LIGHT
EASY-LINK SYSTEM
510 (T-D2) models only
Gas Tankless Water Heater
Suitable for potable water heating and space-heating
*
*Please refer to local codes for space-heating compliance.
If you have any questions, please
call or write to:
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free:
1
-
877
-
737
-
On
-
Demand Water Heater
Installation Manual and Owner’s Guide
Model
s
110 Indoor (T-KJr2-IN)
110 Outdoor (T-KJr2-OS)
310 Indoor (T-K4-IN)
310 Outdoor (T-K4-OS)
510 Indoor (T-D2-IN)
510 Outdoor (T-D2-OS)
WARNING
If the information in these
instructions is not followed
exactly, a fire or explosion
may result causing
property damage, personal injury or death.
ANSI
Z21.10.3
and CSA 4.3
510 (T
-
D2) models
only

Questions and Answers

  • B
    Bradley BakerAug 18, 2025
    How to fix temperature fluctuation in Takagi T-KJr2-IN?
    • N
      Nicole OconnellAug 18, 2025
      If you notice temperature fluctuations in the hot water from your Takagi Water Heater, check these: * Ensure the filter on the cold water inlet is clean. * Verify that the gas line is properly sized. * Confirm sufficient gas supply pressure. * Check for cross-connection between cold and hot water lines.
  • A
    Aaron YoungAug 20, 2025
    What to do if my Takagi Water Heater does not ignite?
    • S
      Samantha PalmerAug 20, 2025
      If the unit does not ignite when water goes through your Takagi Water Heater, ensure the flow rate is over 0.75 GPM. Check the filter on the cold water inlet and inspect for reverse or cross-connections. If you're using a remote controller, verify that the power button is turned on. Also, check if the inlet temperature is too high.
  • G
    Gary WallsAug 23, 2025
    What to do if hot water is not available from my Takagi T-KJr2-IN?
    • M
      Mary CruzAug 23, 2025
      If hot water isn't available when you open a fixture with your Takagi Water Heater, consider the following: * Ensure the unit has a 120 VAC / 60 Hz power supply. * If using a remote controller, check if it's powered on. * Confirm the gas and water supply valves are fully open. * Check if the cold water inlet filter is clean. * Ensure the hot water fixture is open enough to draw at least 0.5 GPM through the heater. * Verify the unit isn't frozen. * For propane models, check if there's enough gas in the tank/cylinder.
  • M
    michaelmartinAug 26, 2025
    Why is my Takagi Water Heater water not hot enough?
    • C
      Chelsea KelleyAug 26, 2025
      If the water from your Takagi Water Heater isn't hot enough, try these steps: * Compare the flow and temperature using the charts. * Check for cross-plumbing between cold and hot water lines. * Ensure the gas supply valve is fully open. * Verify the gas line is properly sized. * Confirm sufficient gas supply pressure. * Check if the set temperature is too low.
  • H
    huntbethAug 28, 2025
    What to do if my Takagi T-KJr2-IN Water Heater water turns cold?
    • C
      Corey BrownAug 28, 2025
      If the hot water from your Takagi Water Heater turns cold and stays cold, consider the following: * Ensure the flow rate is sufficient to keep the water heater running. * If a recirculation system is installed, check if the recirculation line has enough check valves. * Make sure the gas supply valve is fully open. * Check if the filter on the cold water inlet is clean. * Ensure the fixtures are clean of debris and obstructions. * Verify that the flow rate is not too low.
  • S
    Susan GonzalezAug 30, 2025
    Why does the hot water from my Takagi T-KJr2-IN turn cold and stay cold?
    • S
      stephanieduncanAug 30, 2025
      If the hot water from your Takagi Water Heater turns cold and stays cold, ensure the flow rate is sufficient to keep the water heater running. If a recirculation system is installed, check that the recirculation line has enough check valves. Also, verify the gas supply valve is fully open and the filter on the cold water inlet is clean. Finally, make sure the fixtures are free of debris and obstructions, and check if the flow rate is too low.
  • V
    Vanessa RodriguezSep 2, 2025
    How to fix fluctuation in hot water temperature from Takagi T-KJr2-IN?
    • B
      Barry RosarioSep 2, 2025
      If you experience fluctuation in hot water temperature with your Takagi Water Heater, start by checking if the filter on the cold water inlet is clean. Also, ensure the gas line is properly sized and the supply gas pressure is sufficient. Lastly, check for cross-connection between the cold and hot water lines.
  • J
    Justin GarciaSep 4, 2025
    What to do if Takagi Water Heater water is not hot enough?
    • C
      coopersandraSep 4, 2025
      If the water from your Takagi Water Heater is not hot enough, compare the flow and temperature using the charts. Check for cross plumbing between the cold and hot water lines. Ensure the gas supply valve is fully open and that the gas line is properly sized. Verify the gas supply pressure is adequate and that the set temperature is not set too low.
  • C
    Caitlin ChambersSep 6, 2025
    How to decrease time to get hot water from Takagi T-KJr2-IN?
    • J
      Jennifer HubbardSep 6, 2025
      If your Takagi Water Heater takes a long time to deliver hot water to the fixtures, it depends on the length of piping between the water heater and your fixtures. The longer the distance or the bigger the pipes, the longer it will take to get hot water. If you would like to receive hot water to your fixtures quicker, you may want to consider a hot water recirculation system.
  • J
    John NelsonSep 9, 2025
    Why is the water from my Takagi T-KJr2-IN Water Heater too hot?
    • E
      erikaspenceSep 9, 2025
      If the water from your Takagi Water Heater is too hot, check if the set temperature is set too high.

Summary

Installation Manual

Specifications

Detailed technical specifications for the water heater models.

Safety Guidelines

Outlines crucial safety precautions and definitions for installation and use.

Installation Procedures

Covers general installation, clearances, venting, gas, water, and electrical connections.

Venting Instructions

Guidelines for safe and compliant venting of exhaust gases from the unit.

Gas and Electrical Connections

Details on gas supply, pipe sizing, pressure, and electrical wiring for safe operation.

Initial Operation

Steps to follow for the initial startup and safe operation of the water heater.

Owners Guide

Operating Safety

Essential safety information and instructions for operating the water heater.

Normal Operation & Settings

Guidelines for normal use, including temperature settings and flow rates.

Temperature Settings

How to set the desired water temperature using dipswitches or a remote controller.

Freeze Protection System

Details on the unit's freeze protection and how to prepare for long-term non-use.

Maintenance and Troubleshooting

Procedures for routine maintenance, filter cleaning, and diagnosing common issues.

Error Codes

Explains how error codes are displayed and their meanings for troubleshooting.

Components Diagram

Exploded views of the water heater's internal and external components.

Parts List

A comprehensive list of all available parts with item numbers and descriptions.

Limited Warranty

Terms and conditions of the product's limited warranty coverage.

Takagi T-KJr2-IN Specifications

General IconGeneral
Fuel TypeNatural Gas
Flow RateUp to 6.6 GPM
Heating Capacity140, 000 BTU
Energy Efficiency82%
Energy Factor0.82
GPM @ 45°F Rise6.6 GPM
GPM @ 70°F Rise4.2 GPM
Minimum Flow Rate0.5 GPM
Water Connection3/4" NPT
Maximum Temperature167°F
TypeTankless Water Heater
Maximum BTU140, 000 BTU
Dimensions20.1 in. H x 13.8 in. W x 6.7 in. D
Weight28 lbs
Warranty5-year parts
Temperature Range99°F to 167°F
Gas Connection3/4 inch
Vent Size3"
VentingDirect Vent
Minimum BTU19, 500 BTU

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