Vaillant VRT-PZA Mode D'emploi page 32

B Installations instructions – 6 Special operating conditions
6.1 Party operation
This operating condition can only be activated if the
temperatures are controlled according to a heating
programme.
Press party key (4), the display shows the symbol
for party operation (fig. 6.1). In this case, the
thermostat is controlled at the set daytime temperature
even during the following or current drop period resp.
The „party operation" is finished at the beginning of
the next heating period, the symbol
Then, the thermostat operates again according to the
entered heating programme.
Press party key again for terminating the party
operation. The symbol
6.2 Summertime operation,
frost protection
If the rooms should not cool down too much over night,
you do not have to change the selected heating
programme, but only turn the operating mode switch
(1) to position .
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disappears.
, disappears.
6.3 Operation in the case of a power
failure
In the case of a power failure, the timer of your room
thermostat continues operating by means of a
capacitor for some time (power reserve)., the 7-day
heating programme is maintained.
All operating modes of the room thermostat are
preserved during this period. After the mains current is
re-estabished, the heating programme continues
automatically.
6.4 Operation in the case of a
long-term power failure
In the case of long-term power failures causing the
complete discharge of the capacitor, the entered
heating periods are preserved. After the mains current
returns, it is only necessary to update the weekday and
the time of day as described in chapter 3.
The capacitor for the power reserve is recharged
automatically.
(Fig. 1, 6)