Auto-Sleepers Broadway FB, Handbook

Page: 78 / 130

9-14
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.
Filling the water heater
Check if the rotary switch for the drain valve
(FrostControl) is set to “Operation”, meaning
that it is parallel to the water connection and
engaged.
Close the drain valve by pushing the push
button until it engages.
Note: When the temperature at FrostControl
is below about 7ºC, first switch on the heater
to warm the installation compartment and
FrostControl. After several minutes, when the
temperature at FrostControl is above 7ºC,
the drain valve can be closed.
Switch on power for water pump (main or
pump switch).
Open hot water taps in kitchen and bathroom
(set pre-selecting 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.
Note: If just the cold water system is being
operated, without using the water heater, the
heater tank also fills up with water. To avoid
frost damage, the boiler must be drained
through the drain valve, even if it was not
operated.
WARNING: When connecting to a central
water supply (rural or city mains), a
pressure reduction valve must always be
installed to prevent pressures above 2.8
bar from developing in the water heater.
t = Rotary switch position “Operation”
u = Push button position “Closed”
w = Push button position “Drain”
x = Drainage muff (led outside through floor of vehicle)