Buderus GB402-320-5, Installation And Maintenance Instructions For Contractors

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1 Key to symbols and safety instructions
Logano plus GB402 – 6 720 820 700 (2018/01) 4
1 Key to symbols and safety instructions
1.1 Explanation of symbols
Warnings
Keywords at the start of a warning indicate the type and severity of the
ensuing risk, if measures to prevent the risk are not taken.
•
NOTICE indicates that material damage may occur.
• CAUTION indicates that minor to medium personal injury may occur.
• WARNING indicates that severe personal injury may occur.
• DANGER indicates that life-threatening personal injury may occur.
Important information
Additional symbols
1.2 Safety precautions
If you smell gas
▶ Close gas isolation valve.
▶ Open windows and doors.
▶ Never operate electrical switches, including telephones, plugs or
doorbells.
▶ Extinguish any naked flames. Do not smoke! Never use any lighters or
sources of ignition of any kind!
▶ Warn all occupants in the building, but do not ring doorbells.
▶ If you can actually hear gas escaping, leave the building immediately.
Prevent third parties from entering and notify police and fire brigade
from outside the building.
▶ From outside the building , call your gas supplier and licensed
contractor.
Danger if you smell flue gas
▶ Switch off the boiler (

page 32).
▶ Open windows and doors.
▶ Notify an approved contractor.
Danger of poisoning. Insufficient ventilation can lead to dangerous
flue gas leaks.
▶ Never block ventilation and extract air apertures or reduce their size.
▶ The boiler must not be operated, unless you immediately remedy the
fault.
▶ Inform the system user in writing of the problem and associated
danger.
Danger of escaping gases
▶ Ensure that the flue pipes and gaskets are not damaged.
▶ Ensure that the boiler is not equipped with a ventilation air damper or
a thermostatic shut-off damper downstream of the flue connection.
Danger of explosion of flammable gases
▶ Any work on components that carry gas may only be carried out by a
licensed contractor.
Danger posed by explosive and easily flammable materials
▶ Never use or store easily flammable materials (paper, curtains,
clothing, thinners, paints, etc.) in the vicinity of the boiler.
Danger through electric shock when the boiler is open
▶ Before opening up the boiler, isolate it completely from the mains
power supply and ensure the power cannot be inadvertently
reconnected.
▶ It is not enough to switch off the control unit.
Danger through short circuits
To prevent short circuits:
▶ Only use original Buderus cables.
Siting and adjustment
▶ Correct and proper installation and adjustment of the burner and the
control unit are the fundamental requirements for safe and
economical operation of the boiler.
▶ Only permit an authorised contractor to install the boiler.
▶ Never modify any parts for flue gas routing.
▶ Work on components in contact with gas must only be carried out by
certified gas fitters.
▶ Electrical work must only be carried out by qualified electricians.
▶ Boilers must be installed in a separate installation location which is
not normally occupied by persons.
▶ Do not cover or reduce the size of ventilation apertures in doors,
windows and walls. If draught-proof windows are fitted, ensure there
is an adequate supply of combustion air.
▶ Observe all the other applicable technical documentation for other
system components, accessories and spare parts.
▶ Never shut off safety valves!
Water may escape from the safety valve for the hot water system and
piping when the water is being heated.
Risk of damage due to operator error
Operator errors can result in personal injury and material damage.
▶ Ensure that children never operate this appliance unsupervised or
play with it.
▶ Ensure that only personnel who can operate this appliance correctly
have access to it.
Instructing the customer
▶ Explain to the customer how the boiler works and how to operate it.
▶ The user is responsible for the safety and environmental compliance
of the heating system (Federal Immission Act [Germany]).
▶ Inform customers that they must not carry out any modifications or
repairs.
▶ Maintenance and repairs may only be carried out by an authorised
contractor.
▶ Only use genuine spare parts!
▶ Any other combinations, accessories and wearing parts may only be
used if these are specifically designed for the application and impair
neither the performance characteristics nor the safety requirements.
Warnings in this document are framed and identified by
a warning triangle printed against a grey background.
Important information where there is no risk to people or
property is indicated with the adjacent symbol. It is
bordered by lines above and below the text.
Icon Means
▶ Action step

Cross-reference to other parts of this document or to
other documents
• List/list entry
– List/list entry (second level)
Table 1