Bedienungsanleitung Bosch Uni Condens 8000 F (Seite 14 von 48) (Englisch)

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Requirements

Uni Condens 8000 F – 6720867056 (2016/10)

▶ Set the burner output as low as possible. Set the burner to the rated

heat input QN (Hi) specified on the data plate as a maximum.

Never overload the boiler!

▶ Take fluctuating net calorific values of the gas into account; check the

maximum value with the gas supply utility.

▶ Calculate the gas throughput at the burner based on the maximum

net calorific value and set accordingly at the burner.

▶ Only use burners that are suitable for the specified fuels.

▶ Ensure that the oil burner used is suitable for low sulphur fuel oil

(otherwise corrosion from metal dusting may occur). Observe the

burner manufacturer's instructions.

▶ Burners must only be adjusted by a competent contractor.

Fig. 8 Graph

[1] Boiler output at 50/30 °C in kW

[2] Combustion output in kW

To be able to adjust the fuel throughput, install a fuel meter (gas and/or

oil flow meter) that can be checked even in the lower load range of the

burner. The fuel meter should be installed near the boiler and only

measure the quantity of fuel used by the corresponding boiler.

4.3 Requirement for the control unit

▶ For requirements and settings, see chapter 7.1, page 25.

4.4 Minimum requirement for safety equipment

▶ For requirements, see chapter 2.10, page 10 and chapter 13,

page 39.

These requirements also apply in countries where BS EN 12828:2012

does not apply!

4.5 Combustion air quality

▶ To avoid corrosion, keep the supply of combustion air free of

corrosive substances (e.g. halogenated hydrocarbons that contain

chlorine or fluorine compounds).

▶ Never use or store chlorinated cleaning agents or halogenated

hydrocarbons (as contained in spray cans, solvents or cleaning

agents, paints and adhesives, for example) in the installation

location.

▶ Keep the combustion air supply free of dust.

▶ If building work is taking place in the installation location and creating

a lot of dust, shut the boiler down and cover it. A burner

contaminated during building work must be cleaned before

commissioning.

4.6 Water quality of the heating water

The quality of the fill and top-up water is an essential factor for increased

efficiency, functional reliability, long service life and for maintaining the

operational readiness of a heating system. If the system is filled with

water that has a high calcium hardness, this will be deposited on the heat

exchanger surfaces and will restrict the transfer of heat to the heating

water. As a result, the wall temperatures of the stainless steel heat

exchanger surfaces will rise and the thermal stresses will increase

(loads on the boiler shell).

The quality of the fill and top-up water must therefore satisfy the

specifications in the enclosed operator's log. The water quality must be

documented in the operator's log.

If the operator's log is not maintained or is missing, the warranty will be

invalidated.

If the operator's log is not included in the scope of delivery, contact the

address on the back of these instructions.

Water treatment must generally be carried out for boilers > 600 kW,

irrespective of water hardness and the fill and top-up water quantity.

4.7 Using antifreeze

Chemical additives that are not certified as harmless by the

manufacturer must not be used.

Antifreeze based on glycol has been used in heating systems for many

years, for example Antifrogen N manufactured by Clariant.

The use of other types of antifreeze should not be a cause for concern if

the product is comparable with Antifrogen N.

Observe the antifreeze manufacturer's instructions. Follow the

manufacturer's details regarding mixing ratios.

The specific thermal capacity of Antifrogen N antifreeze is lower than the

specific thermal capacity of water. To enable the transfer of the required

heat output, increase the required flow rate accordingly. This should be

taken into account when sizing the system components (e.g. pumps)

and the pipework.

As the heat transfer medium has a higher viscosity and density than

water, take the higher pressure drop through the pipework and other

system components into account.

Check the resistance of all plastic or non-metallic components in the

system separately.

0010014746-001

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