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Takagi T-KD20 - User Manual

Takagi T-KD20
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T-KD20 Instantaneous Water Heater
Installation Manual and Owner’s Guide
Flash Water Heater
Model T-KD20
Suitable for potable water heating and space heating
Indoor Installation Only
FEATURING
ENDLESS HOT WATER
ON DEMAND
COMPACT, SPACE SAVING
ENERGY CONSERVING
COMPUTER CONTROLS
COMPUTERIZED SAFETY
NO PILOT LIGHT
Takagi Industrial Co. USA Inc.
6 Goddard
Irvine, CA 92618
Toll Free (888) 882-5244
www.takagi-usa.com
FOR YOUR SAFETY - This product
must be installed and serviced by a
qualified professional service technician
or licensed person, in water heater
installation. Operation creates carbon
monoxide gas and flue gases, which
can cause serious injury or death.
Improper installation and/or operation,
or installation by an unqualified person,
will void warranty.
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result, causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors or liquids in the
vicinity of this or any other gas
appliance.
WHAT TO DO IF YOU SMELL GAS
Do not use any appliance.
Do not touch any electrical
switch
, do not use any phone
in your building.
Immediately contact your gas
supplier from another
location. 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.

Questions and Answers:

Takagi T-KD20 Specifications

General IconGeneral
TypeTankless
Fuel TypeNatural Gas
Maximum Flow Rate6.6 GPM
Energy Factor0.82
Gas TypeNatural Gas
Maximum BTU Input199, 000 BTU/hr
VentingCategory III Stainless Steel
CategoryWater Heater
Warranty5 years on parts

Summary

Safety First: Essential Precautions

WHAT TO DO IF YOU SMELL GAS

Instructions on immediate actions to take if gas is detected.

WARNING: Fire or Explosion Risk

Warning regarding fire or explosion due to improper following of manual instructions.

Technical Specifications

User Safety Guidelines

Glossary of Terms

Definitions of technical terms used in the manual.

Unit Operation Overview

Starting the Water Heater

Procedure for starting the water heater.

Shutting Down the Water Heater

Procedure for shutting down the water heater.

Temperature Adjustment and Settings

Information on the unit's temperature control and settings.

Understanding Flow Rate Limits

Details on the unit's flow rate capabilities and limitations.

Freeze Protection Measures

Electrical Requirements and Wiring

Detailed Wiring Diagrams

Gas Supply Piping Installation

Water Piping Installation

Pressure Relief Valve Installation

Requirements and installation for the pressure relief valve.

Comprehensive System Installation

Installation Methods

Guidance on wall hanging and standing installation procedures.

Clearances, Combustion Air, and Ventilation

Requirements for indoor clearances, combustion air, and ventilation.

Critical Exhaust Venting Guidelines

Critical guidelines for safe and proper exhaust venting.

Appliance Startup Procedure

First-Time Appliance Operation

Step-by-step guide for the first-time startup of the appliance.

Regular Maintenance Schedule

Troubleshooting Common Issues

Guidance for diagnosing and resolving common operational issues.

Troubleshooting: Insufficient Hot Water

Troubleshooting steps for insufficient hot water.

Troubleshooting: Delayed Hot Water

Diagnosing delays in hot water delivery.

Troubleshooting: Unit Fails to Start

Steps to take if the unit fails to start.

Diagnostic Error Codes

Unit Applications and Uses

Space Heating System Integration

Using the unit for space heating purposes.

Domestic and Space Heating System

Configuration: Storage Tank System

Water Recirculation Setup

Setting up the unit for water recirculation systems.

Step-by-Step Operating Instructions

Critical Safety: Flammable Vapors

Operational Flow Chart

Available Optional Accessories

TK-RE01 Remote Controller Functionality

Details on the remote controller for temperature adjustment and diagnostics.

TK-BK01 Wall Mounting Brackets

Information on wall mounting brackets for secure installation.

TK-TV05 Vent Terminator Use

Description of the vent terminator for wall venting.

TK-TV03 Vent Damper Function

Functionality of the vent damper to prevent backflow.

Dipswitch Settings for Temperature

Indoor Natural Gas Dipswitch Settings

Configuration settings for Natural Gas indoors.

Outdoor Natural Gas Dipswitch Settings

Configuration settings for Natural Gas outdoors.

Indoor Liquid Propane Dipswitch Settings

Outdoor Liquid Propane Dipswitch Settings

Configuration settings for Liquid Propane outdoors.

T-KD20 Parts List

Performance: Flow Rate vs. Temperature

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