4 Operating
10 Operating instructions VRT 350f 0020131979_00
3.5 Frost protection function
The frost protection function protects the heating system
and apartment from frost damage.
The frost protection function monitors the room temperat-
ure. If the room temperature
– falls below 5 °C, the controller switches the heater on
and controls the system to a target room temperature of
5 °C.
– exceeds 5 °C, the heater is switched off but the room
temperature monitoring remains active.
4 Operating
4.1 Operating structure
4.1.1 Access level for the operator
Through the access level for the operator, you access im-
portant information and set-up options which do not require
any special prior knowledge. Via a menu structure, you can
access configurable or read-only values.
4.1.2 Access level for the skilled tradesman
The skilled tradesman will set further values for the heating
installation via the access level for the skilled tradesman.
The settings may only be made by someone with specialist
knowledge; this level is therefore code-protected.
4.1.3 Menu structure design
The menu structure of the controller is split into three
levels. There are two selection levels and one setting level.
From the basic display, you can access selection level 1 and,
from there, you can access the menu structure for one level
up or down. The setting level is accessed from the lowest
selection level.
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