Inspection and maintenance
68
Installation and maintenance instructions ecoTEC plus 0020134833_01
12
12.4.7
Checking the pressure of the expansion
vessel on the boiler
1
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.
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.
1
2
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
2
content
>
Check the CO
2
content (
¬ section 12.1.3
).
Summary of Contents for ecoTEC plus VUI
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