Operating instructions

9-9
FITTED EQUIPMENT
FrostControl (safety/drain valve)
FrostControl is a currentless safety/drain
valve. When there is a danger of frost, it
automatically drains the contents of the boiler
through a drainage muff. If excessive
pressure is present in the system, pressure
will be automatically intermittently equalised
through the pressure relief valve.
Closing the drain valve
Check if the rotary switch is set to
“Operation” (position t), meaning that it is
parallel to the water connection and
engaged.
Close the drain valve by activating the push
button. The push button must engage in
position (u) “closed”.
It can be manually closed with the push
button (position u) and then the boiler filled
only when the temperature at the drain valve
is above approximately 7ºC.
Truma can provide a heating element (part
no. 70070-01) as an accessory; it is inserted
into FrostControl and warms it up to about
10ºC when Combi is switched on. This
means that the boiler can be filled after a
shorter time, irrespective of the temperature
in the installation compartment.
Automatic opening of the drain valve
When the temperature is below
approximately 3ºC at the drain valve, the
drain valve will open automatically, the push
button moves out (position w) and the water
in the boiler drains out through the drainage
muff (x).
Manual opening of the drain valve
Turn the rotary switch by 180º until it
engages, whereby the push button moves
out (position w). The water in the boiler
drains out through the drainage muff (x).
The FrostControl drainage muff (x) must be
free of contamination (slush, ice, leaves, etc.)
at all times so the water can drain out easily.
No warranty given for frost damage.
Taking into operation
Note: Heating is possible without restrictions
with gas, electrical and mixed operation, with
or without water.
Check to make sure the cowl is
unobstructed. Be sure to remove any covers
that may be present.
Turn on the gas cylinder and open quick-
acting valve in the gas supply line.
Check whether the power supply fuse
protection on the camp site is adequate for
the 900W (3.9A) or 1800W (7.8A) that have
been selected using the power selector
switch.
The cable drum must be fully unwound in
order to prevent the power cable from
overheating.
Summer operation (boiler operation only)
Select gas or electrical operation using the
power selector switch. Illumination of the
yellow LED (g) on the power selector switch
indicates that the unit is operating with 230V.
Note: Mixed operation (gas and electrical) is
not possible in summer mode. With this
setting the unit automatically selects
electrical operation with a pre-selected power
setting of 900W or 1800W.
Move the rotary switch on the control panel
to position (l - summer operation) 40ºC or
60ºC. The green (k) and yellow (p) LEDs light
up.
When the selected water temperature is
reached (40ºC or 60ºC) the heater shuts off
and the yellow LEd (p) goes off.
t = Rotary switch position “Operation”
u = Push button position “Closed”
w = Push button position “Drain”
x = Drainage muff (led outside through floor of vehicle)