Operation Manual

Built-in devices
10-3
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.
The outlet valve is located by the heating connection in your
vehicle.
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)
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 posi-
tion (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
position (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 (Po-
sition n) and the contents of the boiler will be drained
off via the drain outlet (o).