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Bosch Uni 3000 F Manual

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30 | Inspection and maintenance
Uni 3000 F6 720 812 900 (2014/10)
▶ Select a cleaning agent that is appropriate for the type of
contamination (soot or encrustation).
▶ Cover the control unit with foil to prevent ingress of the cleaning
agent.
▶ Spray cleaning agent evenly into the hot gas flues.
▶ Heat the boiler to a temperature of at least 70 °C.
▶ Feed brushes through the secondary heating pipes.
▶ Remove the dummy cap on cleaning drain [1].
▶ Drain off any fluid that has accumulated.
▶ Put the cap [1] over the cleaning drain again.
Fig. 33 Opening/closing the cleaning drain
[1] Dummy cap for cleaning drain
7.4 Checking and correcting the water pressure
Your heating system must contain sufficient water to ensure it functions
correctly.
▶ If the water pressure in the heating system is too low, top up with
water.
▶ Check the water pressure monthly.
7.4.1 When should you check the water pressure in the heating
system?
The fill and top-up water quality must comply with the specifications in
the Operating Instructions supplied. Recently added fill or top-up water
loses much of its volume in the first few days because it naturally
releases gases. With new systems you should therefore initially check
the heating water pressure on a daily basis, and then at gradually
increasing time intervals.
Once the heating system is hardly losing any volume, check the heating
water pressure monthly.
A distinction is generally made between open vented and sealed
unvented systems. In practice, open vented systems are rarely installed
nowadays. We will therefore be using a sealed unvented heating system
to demonstrate how you can check the water pressure. All settings will
have already been made by the contractor when the system was first
commissioned.
7.4.2 Sealed unvented systems
With closed systems, the system pressure must be adjusted on the basis
of the heating system requirements.
▶ Check the water pressure of the heating system.
▶ If the pressure in the heating system drops below the required
minimum operating pressure: Add top-up water.
▶ Add top-up water only by means of an approved filling facility in the
return of the pipework for the heating system.
▶ Vent the heating system.
▶ Check the water pressure once more.
▶ Enter the operating pressures and water quality in the operating
instructions.
7.4.3 Open vented systems
For open vented systems, the hydrometer needle [1] should be within
the red band [3].
The operating pressure depends on the static height of the system and
the installation height of the expansion vessel.
Fig. 34 Hydrometer for open vented heating systems
[1] Hydrometer needle
[2] Green needle
[3] Red band
NOTICE: Risk of system damage from moisture in the
control unit.
An ingress of moisture into the control unit will damage
it. Never allow any spray to enter the control unit.
▶ Ensure that you only spray cleaning agent onto the
heating surfaces of the hot gas flues and the
combustion chamber.
Air pockets may form in the heating system through the
fill or top-up water releasing gases.
▶ Vent the heating system (e.g. bleeding the radiators).
▶ If required, top up with water.
6 720 806 032-15.1ITL
1
NOTICE: Risk of 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
(see Operating Instructions).
▶ If water loss occurs frequently, locate the cause and
rectify the problem without delay.
NOTICE: Risk of system damage from thermal stress.
▶ Only fill the heating system when cold (the flow
temperature must not exceed 40 °C).
▶ Fill the heating system during operation only by a
WRAS approved filling facility in the return of the
pipework for the heating system.
6 720 615 362-41.2O
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