Thermal Disinfection; Inspection And Maintenance; Important Notices; General Work - Bosch GC7000WP 50 23 Installation And Maintenance Instructions Manual

Inspection and maintenance

9.4.3

Thermal disinfection

To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
CAUTION
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the
draw-off points.
▶ Set the thermal disinfection in the hot water program of the heating
controller ( heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Set any DHW circulation pump to continuous operation.
▶ Wait until the maximum temperature is reached.
▶ Open all DHW draw-off points, from the nearest to the one furthest
away, and draw off hot water until hot water at a minimum of 70 °C
has flown from all draw-off points for at least 3 minutes.
▶ Restore the original settings.
10 Inspection and maintenance
WARNING
Risk of explosion
▶ Close the gas valve before working on gas-carrying components.
▶ After completing the work, check the tightness of all gas-carrying
components.
CAUTION
Flue gas poisoning
▶ Check the tightness of all flue gas routing parts once the work is
complete.
CAUTION
Electric shock
▶ Avoid contact with the burner control unit, fan or pump when
measuring and adjusting the boiler. These are 230 V parts.
▶ Switch off the boiler before working on electrical parts.
CAUTION
Malfunctioning safety sensors
The function of the safety sensors in the installation room (such as CO,
CO , and gas detectors) must be regularly checked.
2
▶ Check the function of relevant safety sensors during inspection or
maintenance.
▶ You can read about how to perform the check in the instructions for
the safety sensor.
▶ Defects at relevant safety sensors must be rectified immediately.
32
10.1

Important notices

You will need the following measuring devices and tools:
• Pressure gauge with a measurement accuracy of 0.01 mbar.
• Flue gas analysis measurement device.
• Cleaning brush with plastic bristles.
▶ Only install original spare parts.
▶ Replace all loose gaskets when carrying out the work.
Inspection and maintenance interval
To ensure the wall mounted gas condensing boiler works correctly and
safely, the following intervals must be adhered to:
• Inspection: annually,
• Maintenance: every 2 years or following a burner runtime of 4000
hours (depending on which occurs first).
The following tasks must be performed when carrying out an inspection
or maintenance:
 § 10.2

General work

 § 10.3 to § 10.8
Cleaning
 § 10.9 to § 10.15 
Check
measurements
Table 17 Work to be carried out
10.2 General work
The following work is not described in any further detail in this
document. It must, nevertheless, still be carried out:
▶ Check the general condition of the heating system.
▶ Visual inspection and function check of the heating system.
▶ Check the supply air and flue gas routing for function and safety.
▶ Check all gas and water pipes for signs of corrosion.
▶ Replace any corroded pipes.
▶ Check the pre-charge pressure of the expansion vessel.
▶ Check the concentration of any antifreeze/additives that may be used
in the system fill/top-up water annually.
▶ If necessary, check installed water treatment cartridges
(in the backfeed section) to ensure they are functioning correctly and
for wear.
▶ During commissioning and the annual inspection, check all
regulating, control and safety equipment for correct function and,
where applicable, for correct settings.
Reading out Hours run
The number of Hours run that have elapsed since initial commissioning
is displayed in the menu. The number of Hours run specifies whether:
• Components need to be replaced as a preventative measure.
• The Maintenance type needs to be modified.
▶ Open the menu Info > Boiler > Hours run.
▶ Read out the number of Hours run.
▶ Check based on the value read out whether components need to be
replaced ( § 10.16.1, p. 36).
▶ Make a note of the value in the maintenance protocol ( § 10.17, p.
38).
▶ Establish the difference between the value most recently read out
and the previous value from the maintenance protocol.
▶ Check the setting Maintenance type based on this difference and
adjust if required ( § 8.2, p. 22).
Condens 7000 WP – 6721841195 (2022/01)
Inspection Maintenan
ce
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