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Bosch 330-PN-N Installation Manual page 4

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4 | Key to symbols and safety instructions
Danger from escaping flue gases
▶ Ensure all vent pipes and chimneys are not damaged or
▶ Connect only one appliance to each vent system or
chimney liner.
▶ The venting system piping must not feed into another air
extraction duct.
▶ Do not route the flue system piping through or inside
another air extraction duct.
Danger of explosion of flammable gases
▶ Work on gas components may only be carried out by a
trained and certified installer.
▶ Installation, gas and flue connection, initial commissioning,
electrical connections and annual maintenance must only
be carried out by a trained and certified installer.
Combustion air
▶ Keep the combustion air free of corrosive substances
(halogenated hydrocarbons that contain chlorine or
fluorine compounds).
Never shut off safety valves!
▶ Water may escape from the safety valve at any time when
the water is being heated.
▶ servicing and repairs may only be carried out by a trained
and certified installer.
▶ immediately correct all faults to prevent system damage.
▶ use only bosch spare parts! damage caused by the use of
parts not supplied by bosch may void the warranty.
instruct the customer
▶ explain to the customer how the appliance works and how
to operate it.
▶ inform the customer that he/she must not carry out any
alterations or repairs.
Danger from electric shock
▶ Ensure that only an authorized contractor performs
electrical work.
▶ Before performing electrical work, disconnect the power
and secure the unit against unintentional reconnection.
▶ Ensure the system has been disconnected from the power
6 720 644 951 (2014/11)
Risk of scalding at the hot water draw-off point
▶ When the water heater is in operation, temperatures in
excess of 122 °F (50 °C) can occur. To limit the
temperature at the tap, install a thermostatic DHW mixing
▶ Water heated for washing the laundry, dishes and for other
cleaning purposes can cause scalding and permanent
▶ Children, elderly, and handicapped persons are more likely
to be permanently injured by hot water. Never leave such
individuals in the tub or shower unattended under any
circumstances. Children must not be allowed to operate
hot water faucets themselves or to fill a bathtub.
▶ If the building has occupants in the above groups who
operate hot water faucets, or state laws / local ordinances
stipulate specific water temperatures, take the following
– Use the lowest possible temperature setting.
– To prevent scalding, install a tempering device, such as
an automatic mixing valve, at hot water tap or water
heater. Select and install the automatic mixing valve in
accordance with the valve manufacturer's
recommendations and instructions.
▶ Water exiting from drain valves can be extremely hot. To
avoid injuries:
– Check that all connections are tight.
– Direct exiting water away from people.
▶ Measures must be taken to protect against excessive
temperature and pressure! Installation of a T&P safety
valve is required.
To protect against corrosion and ensure compliance with the
rules for electrical safety, observe the following points:
▶ Use metal fittings for potable water heating systems with
plastic piping.
▶ Use only original accessories from the manufacturer.
▶ When installation of the water heater is complete, inspect
the ground conductor (including metal fittings).
Customers are advised to:
▶ Sign a maintenance and inspection contract with an
authorized contractor. Inspect and maintain the water
heater as necessary and on a yearly basis. Service as
▶ Use only genuine spare parts.
330 PN



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