Vaillant ecoTEC VU - Checking the Gas Flow Pressure; Checking CO 2 Content

Inspection and maintenance
Installation and maintenance instructions ecoTEC 0020173113_01 59
12
ing installation, ideally with nitrogen, otherwise with air.
Ensure drain valve on boiler is open during topping up.
> If water escapes from the measuring stub pipes (1) of the
expansion vessel, you must replace the expansion vessel.
12.4 Checking the gas flow pressure
> Check the gas flow pressure (¬ section 10.10).
12.4.1 Checking CO
2
content
> Check the CO
2
content (¬ section 12.1.3).