Vaillant VRT-PZA Mode D'emploi page 38

B Installations instructions – 10 Initial taking into operation
10.3 12 h/24 h reading
The change can be carried out by the authorized
installer:
Remove fuse from the heating appliance. Remove front
casing from the mounting plate acc. to fig. 8.
If a 24-h reading in the display is requested (3, fig. 1),
the 12 h/24 h switch (8, fig. 19) is to be set to 24 h.
If a 12-h reading in the display is requested (3, fig. 1),
the 12 h/24 h switch (8, fig. 10) is to be set to 12 h.
The display reading changes to the new display mode
after max. 30 seconds.
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10.4 Make the room thermostat
ready for operation
After this setting, place the room thermostat on the
mounting plate. Switch on the heating appliance and
insert fuse at the heating appliance.
The VRT carries the "CE" Mark. This demonstrates that the
boiler fulfils the essential requirements of the Gas Appliance
Directive (Directive 90/396/EEC) and The Gas Appliances
(Safety) Regulations 1992.
(Fig. 1 0)