Frost; Draining The Boiler Manually; Draining The Boiler Automatically - Webasto Dual Top Evo 6 Operating Instructions Manual

Operating Instructions
4.3

Frost

There are several features that protect the water supply system against frost.
• Drain water contents manually when there is risk of frost and when storing the
vehicle for a longer period.
See paragraph 4.3.1: "Draining the boiler manually".
• The boiler is drained automatically in case you forgot to drain manually.
See paragraph 4.3.2: "Draining the boiler automatically".
• In case you don't want to drain the water supply system and you don't heat the
interior of the vehicle, you can select the frost protection mode.
See paragraph 4.3.3: "Frost protection mode".
4.3.1

Draining the boiler manually

Drain water contents manually when there is risk of frost and when storing the vehicle
for a longer period.
1 Interrupt power for vehicle system water pump (main switch or pump switch,
depending on instructions of the vehicle manufacturer).
2 Open hot water taps in kitchen, bathroom, shower, etc. (set pre-selecting mixing
taps or single-lever valves to "hot").
3 The electrical safety/drain valve is opened by turning and holding the mode
selector knob (A) against the spring force in the position drain boiler (6) for at
least 5 seconds.
Then, release the knob.
The electrical safety/drainage valve will open for approx. 90 minutes.
During drainage, all green icons on the control panel, as well as the red indicator
on the mode selector knob (A), are blinking.
The boiler content is now discharged to the outside through the electrical safety/
drainage valve.
Place a container beneath the outlet to check whether the water in the boiler has
completely drained away (approx. 10 litres!).
12
Any kind of water from the vehicle has to be discharged at a proper disposal facility.
Drainage can be stopped by again moving mode selector knob (A) to drainage mode
(6) for at least 5 seconds and then releasing the knob.
Avoid the formation of micro-organisms in the lines and in the boiler during storage and
make sure that the water supply system is completely drained. To do this, open all water
valves, connect an air pressure of approx. 2 bar to the hot water line and leave it
connected until the residual water is completely drained off.
4.3.2

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 that it only works when a 12 V power supply is available!
During drainage, all green icons on the control panel, as well as the red indicator on the
mode selector knob (A), are blinking.
After approx. 90 min, the electrical safety/drainage valve will be closed again.
Dual Top Evo 6
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