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34 | Inspection and maintenance
SB625WS/SB745WS6 720 805 218 (2016/02)
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.
Fig. 35 Clean the boiler
[1] Door
[2] Turbulator
[3] Flue brush
Open the inspection port [3] and clean out any deposits from inside
the flue gas box.
If more thorough cleaning is required:
Remove the outer panels.
Unscrew the eight fixing bolts and pull firmly on the flue gas box [1]
to remove it from the boiler.
Check at regular intervals that the condensate drain [2] is not
blocked.
Fig. 36
[1] Flue gas box
[2] Inspection port
[3] Condensate drain
If necessary, replace the gasket [1].
Clean all removed components, then follow the above steps in the
reverse order to refit them.
Fig. 37 Replace gasket
[1] Gasket
8.4 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.
8.4.1 When should you check the water pressure in the heating
system?
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 unvented heating system
to demonstrate how you can check the water pressure. All settings will
have already been made by the installation engineer when the system
was first commissioned.
1
2
3
6 720 805 218-42.1T
1
2
3
6 720 805 218-43.1T
The fill and top-up water quality must comply with the
water requirements 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.
6 720 805 218-44.1T
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