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-Combustion air supply-
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 which may result in
carbon monoxide poisoning or death.
WARNING
The guidelines in this section apply to installations within the United States. All U.S.
installations must conform to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (cur-
rent edition) and local codes.
NOTICE
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 ventilation. Consult a
qualified person if you’re unsure of the proper way to supply air to your water heater.
Check for Chemicals:
Air for combustion and ventilation must be clean and free of corrosive chemicals. If corrosive chemicals, such as
sulfur, flourine, or chlorine are present, the water heater must be direct vented. Failure due to these corrosive
chemicals is not covered by the warranty.
WARNING!
In all cases, ensure that corrosive chemicals are not present at the air intake. Presence of such chemicals at the
air intake could result in death, personal injury, or property damage.
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
• Restaurants
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.
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 installation location has
enough ventilation, contact your local gas utility company or code officials for a safety inspection or direct vent
the water heater
The following instructions will help determine if it may be possible to install the water heater without outside
ventilation.
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 burning appli
-
ances (e.g., water heaters, furnaces, clothes dryers) in the same area. Do not include appliances that are direct
vented. Refer to the following example.
Installation
Installation Manual
Summary of Contents for 240HX3
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