5
Room temperature sensor
To measure the room temperature, an external room temperature
sensor (2) is located in the vehicle. The position of the sensor is
determined by the vehicle manufacturer, depending on the vehicle
model. More information can be found in the operating
instructions for your vehicle.
Fig. 2
The thermostat setting on the control panel depends on the
personal heating requirement and the type of vehicle and must be
idividually determined.
Safety/drain valve
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 container
from frost damage.
a = Lever in position “Operational – closed“ b = Lever in
position “Operational – closed“ c = Lever in position “Drain” d
= Drainage socket (led outside through floor of vehicle)
Opening the safety/drain valve
– Move lever to position (c) - vertical. 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! There shall be no claims under guarantee for
damage caused by frost!
Closing the safety/drain valve
– Move lever to position (a) or (b) - horizontal.
Filling the boiler
Check whether the safety/drain valve is closed (see “Closing the
safety/drain valve).
– Switch on the power for the water pump (main switch or pump
switch).
– Open hot water taps in kitchen and bathroom, (set prese- lecting
mixing taps or single-lever fittings to “hot”). Leave the fittings open
for as long as it takes for the boiler to displace the air and fill up,
and the water to flow 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 residual water that
has frozen. The boiler can be thawed out again by briefly starting it
up (max. 2 minutes). Frozen lines can be thawed out by heating up
the interior.
If connected to a central water supply (rural or urban
connection), a pressure reducer must be used, which
will prevent pressures of greater than 2.8 bar from occurring in the
boiler.
Draining the boiler
If the motor home / caravan is not used during the winter,
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 is now 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.
– There shall be no claims under guarantee for damage caused by
frost!
Start-up
The use of the installed control panel is described in separate
operating instructions.
The interior can be heated in gas, electrical or mixed mode, either
with or without water, depending on the setting.
Check whether the power supply fuse protection at the camp site is
adequate for the 980 W (4.1 A) or 1960 W (8.1 A) that have been
selected.
The cable drum must be fully unwound in order to prevent the power
cable from overheating.
– Check to make sure the cowl is unobstructed. Be sure to remove
any covers that may be present.
– Open gas cylinder and quick-acting valve in gas supply line.
– Fill boiler with water if necessary (see “Filling the boiler”).
– Switch on heater at control panel.
Switching off
– Switch off heater at control panel.
– The switch-off procedure may be delayed by several min- utes
because of internal heater operations.
Always drain water contents if there is a risk of frost!
If the heater is not going to be used for a long period of time, close
the quick-acting valve in the gas supply line and turn off the gas
cylinder.
Maintenance
Only original Truma parts may be used for maintenance and repair
work!
The device must be descaled on a regular basis (at least twice a year).
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