8
Opening the safety/drain valve
– Turn the rotary switch by 180° until it engages, whereby the
pushbutton pops out (position c). The water from the boiler
drains through the drainage socket (d).
The FrostControl drainage socket (d) must be free of contami-
nation (slush, ice, leaves, etc.) at all times so the water can
drain out easily! No frost damage claims may be made
under the warranty.
Closing the safety/drain valve
– Check whether the rotary switch is set to “Operation”
(position a) i.e. is parallel to the water connection and is
engaged.
– Close the safety/drain valve by pressing the pushbutton.
The pushbutton must engage in position (b) “closed”.
Only when the temperature at the safety/drain valve is above
approx. 7 °C can it be closed manually with the pushbutton
(position b) and the boiler filled.
Truma supplies a heating element (part no. 70070-01) as an
accessory, which is plugged into the FrostControl and fixed
in place with a retaining bracket. This heating element heats
the FrostControl to approx. 10°C when the Combi is switched
on.This means that the boiler can be filled sooner, irrespective
of the temperature in the installation compartment.
Automatic opening of the safety/drain valve
If the temperature at the safety/drain valve is below about
3 °C, it will open automatically and the pushbutton pops out
(position c). The water from the boiler drains through the
drainage socket (d).
B. safety/drain valve
(safety/drain valve without frost protection / standard in
UKversion)
The safety/drain valve automatically equalises the pressure in
the event of overpressure in the system. When this occurs,
the water is drained to the outside in intermittent bursts via a
drainage socket.
This safety/drain valve does not protect the water con-
tainer from frost damage.
b
d
Figure 4
a = Lever in position “Operational – closed”
b = Lever in position “Operational – closed”
c = Lever in position “Drain”
d = Drainage socket (routed outside through floor of vehicle)
Opening the safety/drain valve
– Move the lever to vertical position (c). The water from the
boiler drains through the drainage socket (d).
The drainage socket (d) of the safety/drain valve must be free
of contamination (slush, ice, leaves, etc.) at all times so the
water can drain out easily! No frost damage claims may be
made under the warranty.
Closing the safety/drain valve
– Move the lever to horizontal position (a) or (b).
Filling the boiler
Check whether the safety/drain valve is closed (see “Closing
the safety/drain valve).
When the temperature at FrostControl is below approx.
7 °C, first switch on the heater to warm the installation
compartment and FrostControl. After several minutes, when
the temperature at FrostControl is above 7 °C, the safety/drain
valve can be closed.
– Switch on the power for the pump assembly (main switch
or pump switch).
– Open the hot water taps in the kitchen and bathroom (set
preselecting mixing taps or single-lever fittings to “hot”).
Leave the valves open until the boiler has been filled by dis-
placing the air and water is flowing without interruption.
If only the cold water system is being operated without
the boiler, the boiler also fills up with water. To avoid
frost damage, the boiler must be drained via the safety/drain
valve, even if it was not operated.
In the event of frost, filling may be prevented by frozen resid-
ual water. The boiler can be thawed by turning it on briefly (no
more than 2 minutes). Frozen lines can be thawed by heating
the interior.
If the boiler is connected to a central water supply (rural
or urban connection), a pressure reducer must be used,
which will prevent pressures higher than 2.8 bar from
occurring.
Draining the boiler
If the motor home / caravan is not being used during
the frosty period, the boiler must be drained!
– Switch off the power to the pump assembly (main switch or
pump switch).
– Open hot water taps in kitchen and bathroom.
In order to check the water that is flowing out, place an
appropriate container (capacity 10 litres) beneath the
drainage socket (d) of the safety/drain valve.
– Open safety/drain valve
(see “Opening the safety/drain valve”).
The boiler will now be drained directly to the outside via the
safety/drain valve. Check whether all of the water in the boiler
(10 litres) has been drained into the container via the safety/
drain valve.
No frost damage claims may be made under the
warranty.
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