Bedienungsanleitung Bosch Condens GC7000WP (Seite 32 von 52) (Englisch)

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Inspection and maintenance

Condens 7000 WP – 6721841195 (2022/01)

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,

CO2, and gas detectors) must be regularly checked.

▶ 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.

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:

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).

Inspection Maintenan

General work  § 10.2  

Cleaning  § 10.3 to § 10.8 -- 

Check

measurements

 § 10.9 to § 10.15  

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