46
SPEGNIMENTO
5.5
Cleaning the boiler
9
DANGER:
Risk to life from electric shock!
− Before opening a unit: disconnect electrical power and lock
to prevent accidental reactivation.
9
WARNING:
System damage!
− Do not use abrasive cleaning pads or powder detergents.
9
NOTICE:
The combustion chamber and flues must be cleaned periodically
- at least once a year - by a qualified technician.
Clean the boiler and remove any carbon deposits from the surfa-
ces of the heat exchanger
at least once a year
. This not only ex-
tends the boiler’s working life, but also keeps it efficient in terms
of heat output and consumption.
− Open the door (1) and pull out the turbulators (2).
− Use a flue brush (3) or other suitable tool to clean inside the
combustion chamber and the flue gas pipes.
3
2
1
− Open the inspection port (4) and clean out any deposits
from inside the flue gas box.
If more thorough cleaning is required:
− Remove the outer panels.
− Unscrew the fixing bolts and pull firmly on the flue gas box
(5) to remove it from the boiler.
− Check at regular intervals that the condensate drain (6) is
not blocked.
− If necessary, replace the gasket (7).
− Clean all removed components, then follow the above
steps in the reverse order to refit them.
6
4
5
7
5.6
Pulizia esterna
La pulizia della pannellatura esterna della caldaia deve essere ef-
fettuata con panni inumiditi con acqua e sapone.
Nel caso di macchie tenaci inumidire il panno con una miscela al
50% di acqua ed alcool denaturato o con prodotti specifici.
Terminata la pulizia asciugare la caldaia.
0
Non usare prodotti abrasivi o benzina o trielina.
5.7
Checking and correcting the water pressure
The heating system must contain sufficient water to safeguard its
correct function.
− If the water pressure in the heating system is too low, top
up with water.
Check the water pressure monthly.
When should you check the water pressure in the heating sy-
stem?
The fill and top-up water quality must comply with the water re-
quirements in this manual.
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
Recently added fill or top-up water loses much of its volume in
the first few days because it releases gases. With new systems you
should therefore initially check the heating water pressure on a
daily basis, and then at gradually longer 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 hardly
installed nowadays. We will therefore be using a sealed unven-
ted heating system to demonstrate how you can check the water
pressure. All settings will have already been made by the installa-
tion engineer when the system was first commissioned.
Sealed unvented systems
9
NOTICE: System damage through 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 ves-
sel for functionality.
− Observe the requirements regarding water quality.
− If water loss occurs frequently, locate the cause and rectify
the problem without delay.
9
NOTICE: System damage through temperature stresses.
− Only fill the heating system when cold (the flow tempera-
ture must not exceed 104 °F (40 °C)).
− During operation, only fill the heating system via the fill
valve in the heating system pipework (return).
For sealed unvented systems, the pressure gauge needle should
be near the mid point of the gauge. The red needle of the pressure
gauge must be set to the pressure required for the heating system.
− Check the heating system water pressure.
− Top up with water via the filling valve in the heating system
pipework.
− Vent the heating system.
− Check the water pressure once more.
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