The temperature setting in the control unit depends on the individual heat requi-
rement and the vehicle model and must be made individually.
2.10 Safety / relief valve
FrostControl
(Safety / drain valve with integrated anti-freeze / optional in UK version) Frost-
Control is a non-electric safety / drain valve. When there is a danger of freezing,
the boiler automatically empties the water in it via a drain port. When high
pressure occurs in the system, pressure balancing is performed intermittently via
the safety valve.
- a= Rotary switch “Operation” position
- b= Push button “off” position
- c= Push button “dump” position
- d= Drain opening (outward from the vehicle oor)
Opening the safety/relief valve
- Turn the rotary switch 180° until it engages, the pushbutton pops out (position
c). The water in the boiler ows out over the discharge opening (d).
- The accumulation of dirt (snowy, mud, ice, brushwood, etc.) must be prevented
at the discharge opening (d) of the FrostControl to ensure a safe ow of water!
No warranty can be claimed for damage caused by freezing!
Closing the safety/drain valve
- Make sure that the rotary switch is in the “Operation” (position a) position,
parallel to the water connection and inside.
- Close the safety/drain valve by pressing the push button. The push button (b)
should go in in the “off” position.
However, the temperature at the safety / relief valve is approx. Above 7 °C, the
safety / drain valve can be closed manually via the push button (position b) and
the boiler can be lled. Truma supplies a heating element (item no. 70070- 01)
which is attached to the inside of the FrostControl and xed with a safety plate
as an accessory. This heating element turns FrostControl off for approx. It heats
up to 10 °C. The boiler can thus be lled after a short time, regardless of the
temperature at the installation site.
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