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AUTOMATIC
This mode is selected for automatic operation. Depending on the re-
quirements, the heating system is put into operation and controls
itself independently.
DOMESTIC HOT WATER (optional)
This mode is selected if only hot water heating is required. The mode
can only be selected in combination with the HDG Hydronic heating
control.
OFF
In this mode, only the protective programs are active. There is still
electrical voltage in the system.
MANUAL OPERATION
This mode is used for checking all electrical functions and for manu-
ally operating the drives. Using the Up and Down buttons, you can
switch to another display window. All functions are switched on or
off with the Plus or Minus buttons.
CHIMNEY SWEEP TEST
This mode is used to perform the biannual chimney sweep test. The
boiler is heated for this to the nominal thermal power. Working to-
gether with the HDG Hydronic heating control, the loads are acti-
vated.
6.2 Switching on the heating system
REQUIREMENTS
Before the heating system is turned on, the following requirements
must be met.
• The heating system has been commissioned by authorised specia-
lists.
• The fuse on the power supply is switched on.
• The main switch on the heating system is turned off.
• The fuel bunker is filled.
✎ See section “6.8 Filling the fuel bunker” in this chapter.
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