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Takagi GS-20W-AU5 User Manual

Takagi GS-20W-AU5
28 pages
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INSTALLATION GUIDE and
OWNER’S GUIDE
GAS WATER HEATERS
GS-20W-AU5/6
GS-26W-AU5/6
EXTERNAL INSTALLATION ONLY
WARNING
DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN
OPERATION.
DO NOT USE OR STORE FLAMMABLE MATERIALS IN OR NEAR THIS
APPLIANCE.
DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE.
DO NOT MODIFY THIS APPLIANCE.

Table of Contents

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Takagi GS-20W-AU5 Specifications

General IconGeneral
CategoryResidential
Energy SourceNatural Gas
Energy Factor0.82
Water Connection3/4" NPT
Ignition TypeElectronic
TypeTankless
Maximum BTU Input199, 000 BTU/hr
Voltage120V
Safety FeaturesOverheat protection, freeze protection, flame failure device

Summary

Specifications

For Service

Maintenance and fault-finding must be done in accordance with these instructions and applicable regulations.

For the Plumber

Follow installation and operating instructions for water heater outlet connection and temperature testing.

Introduction

Accessories

Dimensions and Connection Points

Safety Guidelines

Installation

Confirm the Appliance Suitability

Check gas type label and rating plate for correct gas type, pressure, water pressure, and electrical rating for the application.

Selecting Installation Location

Clearances for Outdoor Heater Locations – AS5601

Gas Connections

Sizing and Connecting

Check gas type label and ensure gas inlet pressure is within the appropriate range for sizing and connecting the gas supply.

Water Connections

Electrical Connection

Remote Controller (Optional Item)

Initial Operation

Normal Operation

Without Remote Controller

Steps to open taps, mix water, and close taps for operation without a remote controller.

Freeze Prevention

Winter Shutdown

Instructions on how to drain the unit for winter shutdown to prevent freezing damage and ensure unit longevity.

Maintenance and Service

Unit Draining and Filter Cleaning

Procedures for draining the unit and cleaning the cold-water inlet filter as part of regular maintenance.

General Troubleshooting

Water Heater

Troubleshooting common problems related to the water heater's performance, such as temperature issues or ignition failures.

Remote Controller (Optional)

Troubleshooting common issues with the optional remote controller, like display problems or temperature setting errors.

PCB Error Code

Wiring Diagram

DIP Switch Settings

Operating Safety

Water Flow and Water Temperature

Warranty Conditions

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