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Bosch 940 ESO Manual page 5

940 eso - natural gas / 940 eso - liquefied petroleum (lp) gas
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For your safety
▶ Do not store or use gasoline or other flammable, combustible or
corrosive vapors and liquids in the vicinity of this or any other
DANGER: Fatal accidents!
Carbon monoxide poisoning.
▶ Carefully plan where you install the heater. Correct
combustion air supply and flue pipe installation are
very important. If a gas appliance is not installed
correctly, fatal accidents can result such as carbon
monoxide poisoning or fire.
Carbon monoxide poisoning.
▶ Exhaust gas must be vented to outside using
approved vent material (In Canada use only
ULCS636 approved material). Vent and combustion
air connector piping must be sealed gas-tight to
prevent flue gas spillage, carbon monoxide
emissions and risk of fire, resulting in severe
personal injury or death. Approved vent
terminations must be used when penetrating to the
DANGER: Electric shock!
▶ Field wiring connections and electrical grounding
must comply with local codes, or in the absence of
local codes, with the latest edition of the National
Electric Code, ANSI/NFPA 70, or in Canada, all
electrical wiring must comply with the local codes
and the Canadian Electrical Code, CSA C22.1 Part 1.
DANGER: Electric shock!
Shock hazard: line voltage is present.
▶ Before servicing the water heater, unplug power
supply cord from outlet. Failure to do so could result
in severe personal injury or death.
WARNING: Damage to the appliance from over
▶ The heater must be disconnected from the gas
supply piping system during any pressure testing of
that system at test pressures equal to or more than
0.5 psi.
▶ The appliance should be located in an area where
leakage of the heater or connections will not result in
damage to the area adjacent to the appliance or to
lower floors of the structure. When such locations
cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the
appliance. The pan must not restrict combustion air
940 ESO
Key to symbols and safety instructions | 5
▶ The maximum inlet gas pressure must not exceed the
value specified by the manufacturer and the
minimum value listed is for the purpose of input
▶ 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 this situation.
WARNING: Fire danger!
▶ Keep appliance area clear and free from combustible
materials, gasoline and other flammable vapors and
▶ Do not obstruct the flow of combustion and
ventilation air.
NOTICE: Appliance malfunction!
▶ If power is lost while appliance is operating. Turn off
both water and power for 15 seconds to reset
WARNING: Risk of scalding and property damage.
▶ Precautions must be taken prior to manually
operating the relief valve to avoid contact with hot
water discharged from the relief valve and to prevent
water damage.
NOTICE: Appliance damage!
▶ Label all wires prior to disconnection when servicing
controls. Wiring errors can result in improper and
dangerous operation. Verify proper operation after
WARNING: System damage!
▶ If a relief valve discharges periodically, this may be
due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing
inspector on how to correct this situation. Do not
plug the relief valve.
WARNING: Property damage!
▶ If the water heater is used in a space heating
application, all piping and components connected to
the water heater must be suitable for use with
potable water.
WARNING: Personal Injury from toxic chemicals.
▶ Toxic chemicals, such as those used for boiler
treatment, shall not be introduced into the potable
water used for space heating.
6 720 644 956 (2016/05)



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