Bosch Therm 4000 S Installation And Operating Manual page 4

4 | Key to symbols and safety instructions
the manufacturer or its customer service
department or a similarly qualified person."
Installation, commissioning and maintenance
The installation, commissioning and maintenance may only be
carried out by an authorised contractor.
▶ Check the tightness of the connections to the device (gas
and water).
▶ Only fit original spare parts.
Inspection and maintenance
Regular inspection and maintenance are essential for the safe
and environmentally-sound operation of the heating system.
We recommend taking out an annual inspection and
maintenance contract with the manufacturer.
▶ Work should only be carried out by an authorised
contractor.
▶ Immediately remove any faults detected.
Any situation that does not meet the conditions described in
the manual must be duly assessed by a qualified, contractor. In
the event that it is approved for use, the technician shall adapt
the maintenance requirements to the wear and tear and
associated conditions as well as the standards and
requirements of the market and the particular application.
Modifications and repairs
Unprofessional modifications to the appliance or other parts of
the heating system can result in injury and/or damage to
property or equipment.
▶ Have any work carried out only by an authorised
contractor.
▶ Do not remove the appliance case.
▶ Do not modify the appliance or other parts of the heating
system in any way.
Electrical work
Electrical work must only be carried out by a qualified
electrician.
▶ Before starting electrical work:
– Isolate the mains electrical supply and secure against
unintentional reconnection.
– Check for zero potential.
▶ Also observe connection diagrams of other system
components.
Open flue operation
The installation room must be adequately ventilated if the
appliance draws its combustion air from the room.
▶ Consult an authorised contractor to ensure the ventilation
requirements are met:
6 720 819 528 (2016/02)
– if structural modifications are made (e.g. replacing
windows and doors)
– if appliances are subsequently installed which route
extract air to the outside (e.g. extract air fans, kitchen
fans or air conditioning units).
▶ Never cover or reduce the size of ventilation apertures.
Handover to the user
When handing over, instruct the user how to operate the
heating system and inform him about its operating conditions.
▶ Explain how to operate the heating system and draw the
user's attention to any safety-relevant action.
▶ Explain that modifications and repairs must only be carried
out by an authorised contractor.
▶ Point out the necessity of inspection and servicing for safe
and environmentally compatible operation.
▶ Leave the installation instructions and the operating
instructions with the user.
Therm 4000 S