Inspection and maintenance
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37
6 720 805 218 (2013/02)
SB625WS/SB745WS
▶ 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.
8.4.2
Sealed unvented systems
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.
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
1
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
vessel for functionality.
▶ Observe the requirements regarding water quality.
▶ If water loss occurs frequently, locate the cause and
rectify the problem without delay.
NOTICE:
System damage through temperature
stresses.
▶ Only fill the heating system when cold (the flow
temperature must not exceed 104 °F (40 °C)).
▶ During operation, only fill the heating system via the
fill valve in the heating system pipework (return).
Summary of Contents for Buderus SB625WS
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