Equipment details
83
s = Room temperature sensor
The thermostat setting on the control panel
(1 – 5) must be determined individually
depending on the heating requirement and
the type of vehicle. For an average room
temperature of about 23 °C, we recommend a
thermostat setting of about 4.
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 equalized through the pressure
relief valve.
t = rotary switch position “Operation”
u = push button position “Closed”
w = push button position “Drain”
x = drainage muff (led outside through floor of
vehicle)
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”.
Only when the temperature around the drain
valve is over around 7 °C can it to be closed
manually with the press button (“u” position)
and the boiler filled. Truma supplies a heating
element (part no. 70070-01) as an accessory,
which is inserted 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 after a shorter
time, irrespective of the temperature in the
installation compartment.
Automatic opening of the drain valve
If the temperature around the drain valve is
below about 3 °C, it will open automatically
and the push button will disengage (outward
movement) (“w” position). The water from the
boiler will be released through the drainage
muff (x).
Manual opening of the drain valve
Turn the rotary switch by 180° 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! There
shall be no claims under guarantee for damage
caused by frost!
Taking into operation
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.
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