Operation Manual

Built-in devices
10-13
To activate
• Push in the knob at position (m) slightly and, at the same
time, move it 90° towards position (k).
• If the switch is in position (k), the knob will remain in position (m).
To deactivate
• Turn the switch at position (k) by 90° so that it is parallel to
the frost control.
• At the same time, the knob will jump from position (m) to (n).
The drain valve can only be closed manually using the
push button (Position m) and the boiler lled if the valve
temperature is above approx. 7°C.
If the temperature of the safety/drain valve is lower than approx.
3°C, the push button will be ejected (Position n) and the con-
tents of the boiler will be drained o via the drain outlet (o).
k
m
n
o
FrostControl
FrostControl is a non-electric safety or drain valve. If there
is a risk of sub-zero temperatures it automatically drains the
content of the boiler via a drain outlet.
If the system is under excess pressure intermittent pressure
equalisation will automatically take place via the safety valve.
k Rotary switch position “ON”
m
Push button position “CLOSED”
n Push button position “DRAIN”
o Drain outlet (to the outside through the vehicle oor)
k