Combustion Air Supply - Takagi AT-KJr3U-IN Installation Manual And Owner's Manual

On-demand water heaters series 200

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Table Of Contents

Table of Contents

• This gas water heater requires an adequate source of clean air for combustion

and ventilation. Without sufficient air, your water heater may not operate

properly and may emit excessive and abnormal amounts of carbon monoxide

WARNING

which may result in carbon monoxide poisoning or death.

Before installing the water heater, you must determine the amount of air needed to supply this water

heater and any other gas appliances in the same area and provide adequate air for combustion and ventila-

tion. Consult a qualified person if you're unsure of the proper way to supply air to your water heater.

Before beginning

Calculate total BTU/h rating of all appliances.

To calculate the combustion air and ventilation required, add up the total BTU/h ratings of all gas burn-

ing appliances (e.g., water heaters, furnaces, clothes dryers) in the same area. Do not include appliances

that are direct vented. Refer to the following example.

Your water heater's BTU/h rating is on the rating plate. The BTU/h ratings should be on the other

appliances' rating plates. If you have trouble determining the BTU/h ratings, contact the manufacturer or

have a qualified person determine the ventilation requirements.

: If you are replacing your old water heater with one that has a higher BTU/h rating, the amount of

NOTICE

ventilation required may be greater.

Example:

Gas Burning Appliance

Gas Water Heater

Furnace

Does your installation space have sufficient combustion air?

Ventilation with outside air is recommended for all installations. Even if the water heater is installed in a

large, open room inside the house, outdoor air is usually needed because modern homes are very tightly

sealed and often do not supply enough air to the water heater. However, when installed in a large indoor

space, it may be possible to provide enough air without outside ventilation. If you are unsure if your instal-

lation location has enough ventilation, contact your local gas utility company or code officials for a safety

inspection or direct vent.

The following instructions will help determine if it may be possible to install the water heater without outside

ventilation.

Check for Chemicals:

Installations where corrosive chemicals may be present require the water heater to be direct vented. Air for

combustion and ventilation must be clean and free of corrosive or acid-forming chemicals such as sulfur, fluo-

rine, and chlorine. Ventilation with outside air will reduce these chemicals, but it may not completely eliminate

them. Failure due to corrosive chemicals is not covered by the warranty. Examples of locations that require

outside air due to chemicals include:

•

Beauty salons

•

Photo processing labs

•

Indoor pools

•

Laundry, hobby, or craft rooms

•

Chemical storage areas

Products such as aerosol sprays, detergents, bleaches, cleaning solvents, gasoline, air fresheners, paint and

varnish removers, and refrigerants should not be stored or used near the water heater.