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12
Inspection and maintenance
12.4.7 Checking the pressure of the expansion
vessel on the boiler
12.11 Check the pressure of the expansion vessel on the boiler
The service valves of the boiler must be closed.
> Measure the pressure of the expansion vessel at the
measuring stub pipe (1) of the vessel while the boiler is
depressurised.
> Top up the expansion vessel at a pressure of less than
0.75 bar in accordance with the static height of the heat-
ing installation, ideally with nitrogen, otherwise with air.
Ensure that the drain valve on boiler is open when top-
ping up.
> If water escapes from the measuring stub pipes (1) of the
expansion vessel, you must replace the expansion vessel.
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12.4.8 Check the pressure of the expansion vessel
on the layered storage tank
i
One check every three years is sufficient.
> Close the stop valve on the hot water system.
> Release the pressure from the boiler.
> Unscrew the bolt from the cover of the layered storage
tank and remove the cover.
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12.12 Check the pressure of the expansion vessel on the lay-
ered storage tank
The expansion vessel (1) is freely accessible.
> Unscrew the sealing cap (2) from the expansion vessel.
> Check that the pressure of the expansion vessel is
approx. 4 bar. At a lower pressure, the vessel must be
repressurised using an air pump.
> Screw the sealing cap (2) back onto the expansion ves-
sel.
> Refit the cover.
> Repressurise the boiler and the hot water system.
12.5
Checking the gas flow pressure
> Check the gas flow pressure (¬ section 10.12.4).
12.5.1 Checking the CO
> Check the CO
content (¬ section 12.1.3).
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Installation and maintenance instructions ecoTEC plus 0020134833_01
content
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