Installation Instructions

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.
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6 720 805 218-42.1T
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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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