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Operating Instructions Dual Top Evo 7 / 8
26
4.7.3 Draining the boiler automatically
The electrical safety/drainage valve is opened electrically.
If the water temperature at the electrical safety/drainage valve is less than 6 °C, the
boiler water contents may discharge automatically.
This function is active when:
the appliance is switched "OFF";
in winter mode (heating without hot water production) during a period when there
is no heating action in the heater (e.g.: selected interior temperature is reached, low
outside temperature);
if battery power is too low;
there is a failure!
NOTE
Note that it only works when a 12 V power supply is available!
During drainage, “ ” (9) appears on display.
After approx. 90 min, the electrical safety/drainage valve will be closed again.
The drainage outlet of the electrical safety/drainage valve must always be kept clear
(free from dirt, ice, leaves etc.)!
To avoid water loss and to protect the heater and boiler against frost, select the frost
protection mode (see paragraph 4.7.4: "Frost protection mode").
NOTE
Automatic drainage can not be stopped.
However, when you switch mode to manual drainage, it can be aborted.
(See paragraph 4.7.2: "How to stop draining the boiler").
NOTE
Draining the boiler as well as the frost protection mode protect the heater and boiler
against frost. Not all water lines in the vehicle can be protected against freezing due to
installation variations.
When storing the vehicle, either choose a place that is well protected against low
temperatures or drain the whole water system, including all lines and tubes (e.g. with
air pressure, see note in paragraph 4.7.1: "Draining the boiler manually").
There shall be no warranty claims for damage caused by frost!
4.7.4 Frost protection mode
This mode is a safety feature for the heater only. It does not prevent the water circuits
inside and outside the vehicle from freezing.
Store the vehicle at a place that is well protected against frost or drain water contents
if there is a risk of frost!
Make sure the device is switched on.
1 Press MENU.
2 Press and to select “Frost Protection”.
3 Press OK.
4 Press and to select the desired heat source:
* Options “...W ~ 230 V” shown only when external 230 V power supply is
connected.
5 Press OK.
6 Selection completed” on display.
Dual Top Evo 7:
“Diesel powered”
“600 W ~ 230 V“ *
“1,200 W ~ 230 V“ *
Dual Top Evo 8:
“Diesel powered”
“1,000 W ~ 230 V“ *
“2,000 W ~ 230 V“ *
26


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