Bedienungsanleitung Bosch Uni Condens 8000 F (Seite 9 von 12) (Englisch)

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Inspection and maintenance

Uni Condens 8000 F – 6720867069 (2016/10)

6.3.1 When should you check the operating pressure in the

heating system?

The fill and top-up water quality must comply with the specifications in

the operator's log supplied.

Air pockets may form in the heating system through the fill or top-up

water releasing gases.

▶ Vent the heating system (e.g. at the radiators).

▶ If required, top up with water.

Recently added fill or top-up water loses much of its volume in the first

few days because it releases gases.

With newly filled systems:

▶ Initially check the operating pressure of the heating water daily and

then in ever increasing intervals.

Once the heating system is hardly losing any volume:

▶ Check the operating pressure of the heating water once a month

A distinction is made between open and closed systems. In practice,

open vented systems are rarely installed nowadays. We will therefore be

using a closed heating system to demonstrate how you can check the

operating pressure. All settings will have already been made by the

contractor when the system was first commissioned.

6.3.2 Sealed unvented systems

NOTICE:

System damage due to frequent topping up!

Subject to the water quality, your heating system can be damaged

through corrosion or scaling.

▶ Ensure that the heating system is vented correctly.

▶ Check the heating system for leaks and the expansion vessel for

functionality.

▶ Observe the requirements regarding water quality

( operator's log).

▶ If water loss occurs frequently, locate the cause and rectify the

problem without delay.

NOTICE:

System damage due to temperature stresses!

▶ Only fill the heating system when cold (the flow temperature must not

exceed 40 °C).

▶ During operation, only fill the heating system via the filling facility in

the heating system pipework (return).

In closed systems, the pressure gauge needle ( fig. 2, [3], page 9)

must be within the green marking [2]. The red needle [1] of the pressure

gauge must be set to the minimum pressure required for the heating

system.

▶ Check the operating pressure of the heating system.

If the pressure gauge needle [3] drops below the green marking [2]:

▶ Top up with water.

▶ Top up with water via a filling facility in the heating system pipework.

▶ Remove air at the heating system.

▶ Check the operating pressure again.

Fig. 2 Pressure gauge for sealed unvented heating systems

[1] Red needle

[2] Green marking

[3] Pressure gauge needle

6.3.3 Installations with automatic pressurisation units

For installations in which an automatic pressure maintaining system is

integrated:

▶ Follow the manufacturers' instructions.

▶ Observe water quality requirements ( operator's log).

6.3.4 Water samples

The quality of the fill, top-up and boiler water must be regularly

documented in an operator's log.

▶ Have water samples taken by a contractor.

▶ Document result in operator's log.

6 720 648 053-30.1T

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