Vimar 01910 Montageanweisungen Seite 31

• Button .
Pressed in sequence, makes it possible to set the values for the
"Antifreeze temperature", of the "Temperature levels T1-T2-
T3", the "Hysteresis", and "Temperature scale".
- TEMPERATURE LEVELS.
Displays and/or modifies the values of the temperature set-
points T1, T2, T3 for both heating and cooling programs.
- HYSTERESIS.
Adjusts the value of the temperature hysteresis parameter.
Hysteresis is the amount by which the ambient temperature
can deviate from the set-point before the system is switched on
and off. By adapting the hysteresis parameter to the type of sys-
tem, it is possible to prevent repeated switch-on and switch-off
around the set-point value; systems with high inertia (for example
with cast iron radiators) require a low hysteresis value, whereas
systems with low inertia (for example fan-convectors) require a
higher value.
Example.
With a temperature set-point of 20 °C and a hysteresis of 0.3 °C,
the system will switch on when the ambient temperature drops
below 19.7 °C, and will switch off when the ambient temperature
reaches 20.3 °C.
- TEMPERATURE SCALE.
Used for setting the units of measurement for temperature,
choosing between degrees Celsius and degrees Fahrenheit.
• Button .
Sets the current day of the week and time. In programming, it is
used to set the time in 15-minute increments.
• Button .
When this button is held down, all parameters set return to their
original default status (clock reset, user programs deleted, return
to default values for the 3 temperature levels).
27 - ENGLISH