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Following the post-purge, the fan stops and the pressure switch opens:
The icons and are dimmed.
The message POST PURGE vanishes.
With any subsequent heat demand, the heating cycle will resume from step 1.
4.2 Turn off the water heater
4.2.1 Turn off for a short period
To decommission the water heater for a short period, you must activate the frost
protection. The frost protection will prevent water from freezing in the water heater.
Activate the frost protection as follows:
Press [ ] to select the main menu.
Using [ ] and [ ], place the cursor beside OFF.
Confirm with [ENTER].
The frost protection cuts in when the water temperature drops below 5°C. The text FROST
will then appear on line one of the display. The water heater will heat the water to 20°C
(T
set
) before dropping back to mode OFF.
Caution
The anode protection remains active when the OFF mode
is selected.
Note
These values of 5°C and 20°C cannot be adjusted.
Note
If the water heater is not used for longer than two months and the water is not drained,
air bubbles may form in the water heater. This can lead to air in the water pipes.
4.2.2 Isolate from the mains
The water heater may only be isolated from mains power in the correct way. The correct
procedure is as follows:
Activate the MENU with [ ].
Position the cursor in front of OFF.
Confirm OFF with [ENTER].
Caution
Failure to wait until the fan stops can cause damage to the water heater.
Wait until the fan has stopped. The icon is then dimmed.
Switch the water heater OFF (position 0) using the control switch on the operator
interface.
8.
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-
1.
2.
c
n
1.
2.
3.
c
4.
5.
0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03 27
27


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