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Topics in this section
• Safety Symbols
• Safety Precautions
This manual contains the following important
safety symbols. Always read and obey all safety
messages.
This is the safety alert symbol. This
symbol alerts you to potential hazards
that can kill or hurt you and others.
DANGER
which, if not avoided, will result in personal injury
or death.
WARNING
which, if not avoided, could result in personal
injury or death.
CAUTION
which, if not avoided, could result in minor or
moderate injury. It may also be used to alert
against unsafe practices.
WARNING
• Before operating, smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
• Keep the area around the appliance clear and
free from combustible materials, gasoline, and
other flammable vapors and liquids.
Demand Duo
H-Series with SENSEI CX Installation Instructions
Indicates an imminently
hazardous situation
Indicates a potentially
hazardous situation
Indicates a potentially
hazardous situation
• Combustible construction refers to adjacent
walls and ceiling and should not be confused
with combustible or flammable products and
materials. Combustible and/or flammable
products and materials should never be stored
in the vicinity of this or any gas appliance.
• Always check the water temperature before
entering a shower or bath.
• To protect yourself from harm, before
performing maintenance:
− Turn off the electrical power supply by
unplugging the power cord or by turning off
the electricity at the circuit breaker.
(The "On/Off" button on the temperature
controller does not control the electrical
power.)
− Turn off the gas at the gas valve, usually
located immediately before the water
heater.
− Turn off the incoming water supply.
This can be done at the isolation valve
immediately before the water heater or by
turning off the water supply to the building.
• Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, do not try to
repair it; call a licensed professional. Force or
attempted repair may result in a fire or
explosion.
• Do not use this appliance if any part has been
under water. Immediately call a trained and
qualified professional to inspect the appliance
and to replace any part of the control system
and any gas control which has been under
water.
• Do not use substitute materials. Use only
parts certified for the appliance.
• Should overheating occur or the gas supply
fail to shut off, turn off the manual gas control
valve to the appliance.
• Do not use an extension cord or an adapter
plug with this appliance.
• Any alteration to the appliance or its controls
can be dangerous and will void the warranty.
• If a water heater is installed in a closed water
supply system, such as one having a
backflow preventer in the cold water supply
line, means shall be provided to control
thermal expansion. Contact the water
supplier or local plumbing inspector on how to
control thermal expansion.
5
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