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System maintenance 7
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We reserve the right to make any changes due to technical modifications.
Operating instructions Oil- and gas-fired special boilers Logano GE515 • Issue 02/2006
Systems are generally differentiated as open or sealed
systems. Open systems are now only rarely installed.
Therefore, a sealed system is used as an example of
how you can check the water pressure.
The specialist will have carried out all initial settings
during commissioning.
7.2.2 Open systems
On open systems (if fitted) the pressure gauge needle
(Fig. 4, item 1) must be within the red range (Fig. 4,
item 3).
7.2.3 Sealed systems
On sealed systems the pressure gauge needle (Fig. 5,
item 2) must be within the green range (Fig. 5, item 3).
Set the red needle (Fig. 5, item 1) on the pressure
gauge to the required system pressure.
z Check the system water pressure
z Shut off the pressure expansion vessel from the
system by closing the cap valve.
z Check the connections and pipework for leaks.
z Open the mixing and shut-off valves on the hot water
(primary) side.
z Fill the system via an approved filling link.
Fig. 4 Pressure gauge for open systems
Item 1: Pressure gauge needle
Item 2: Green needle
Item 3: Red marking
Fig. 5 Pressure gauge for sealed systems
Item 1: Red needle
Item 2: Pressure gauge needle
Item 3: Green marking
3
1
2
3
1
2
CAUTION!
SYSTEM DAMAGE
hrough over pressure during leak testing.
Pressure, control and safety equipment
may be damaged through excessive
pressure.
z When you carry out a leak test, make
sure that no pressure, control or safety
equipment is fitted which cannot be
isolated from the boiler water chamber.
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