Bedienungsanleitung Webasto Dual Top ST 8 (Seite 14 von 19) (Englisch)

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4 | Operating instructions

14 / 19 9026381C Dual Top ST 6 _ 8 - OI

4.7.1 Draining the boiler manually

Drain water contents manually when there is risk of frost and

when storing the vehicle for a longer period.

Both manual and programmable control panel:

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 preselecting mixing taps or single-lever valves to

"hot").

If you have manual control panel, then continue with fol-

lowing steps:

1. 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.

2. Then, release the knob. The electrical safety/drainage valve

will be open for approx. 90 minutes.

3. 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 wa-

ter in the boiler has completely drained away (approx. 9 litres!).

If you have programmable control panel, then continue

with the following steps:

1. Make sure the device is switched on.

2. Press MENU.

3. Press and to select “ Draining Boiler”.

4. Press OK. The display shows: “Press OK to confirm boiler

drainage”

5. Press OK. The display shows:

“Draining... Press MENU to select heating operation”

and

“Press STOP to abort drainage” “ ” (9)

NOTE

Any kind of heater operation will be stopped when

manually starting boiler drainage.

NOTE

To stop drainage see chapter4.7.2, "How to stop drain-

ing the boiler" on page 14.

uThe boiler content is now discharged to the outside

through the electrical safety/ drainage valve.

uPlace a container beneath the outlet to check

whether the water in the boiler has completely

drained away (approx. 9 litres!).

uAfter approx. 90 min, the message “Drainage com-

pleted” is shown.

1. Press OK to end manual drainage.

NOTE

Any kind of water from the vehicle has to be discharged

at an appropriate disposal facility.

NOTE

Avoid the formation of micro-organisms in the lines and

in the boiler during storage and make sure that the wa-

ter supply system is completely drained. To do this,

open all water valves, connect an air pressure of ap-

prox. 2 bar to the hot water line and leave it connected

until the residual water is completely drained off.

4.7.2 How to stop draining the boiler

For heaters with a manual control panel, you can stop drainage

by moving mode selector knob (A) to drainage mode (6) for at

least 5 seconds and than releasing the knob.

In case of a programmable control panel, you can stop boiler

drainage, if needed.

1. Make sure the device is switched on.

2. Press MENU.

3. Press and to select “ Draining Boiler”.

4. Press OK.

5. The display shows “Press OK to confirm boiler drain-

age”. Press OK.

The display shows:

“Drainage... Press MENU to select heating operation”

“Press STOP to abort drainage” “ ” (9).

6. Press STOP.

The display shows: “Drainage aborted”.

7. Press OK.

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 auto-

matically.

This function is active when:

nthe device is switched "OFF";

nin 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);

nif battery power is too low;

nthere is a failure!

NOTE

Note that the electrical safety/drainage valve only works

when a 12 V power supply is available!

With a manual control panel, during drainage, all green icons,

as well as the red indicator on the mode selector knob (A), are

blinking.

With a programmable control panel, 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 chapter4.7.4, "Frost

protection" on page 15 ).

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