Part 3: General function description Expert area
51
Heat generator frost protection
The heat generator frost protection is activated when the
heat generator temperature drops below 5 °C. The heat
generator is switched on until the heat generator tempera-
ture exceeds the "MINIMUM HEAT GENERATOR
TEMPERATURE“.
Flow or storage tank sensor frost protection
The sensor frost protection is activated when the flow or
storage tank temperature drops below 7 °C. Only the rele-
vant pump is switched on.
The sensor frost protection is deactivated when the flow or
storage tank temperature increases to above 9 °C.
Frost protection via room sensor
If the room temperature drops below 5 °C the frost protec-
tion function is activated.
The room temperature setting for the relevant heating cir-
cuit is set to 5 °C. The heating circuit is enabled:
the pumps are switched on
the heat request is sent to the heat generator
eBUS burner controls
The controller supports the operation of burner controls via
the implemented eBUS. The unit is connected by means of
the connector VII (FA eBUS).
Heat request: Controller => Burner / FA
05h07h [in data byte 7 = Process water desired value the
burner must not interpret bit 7] additionally
05h01h [in data byte 3 the collector temperature is trans-
mitted (instead of hot water desired temperature)]
Data/Status: Burner/FA => Controller
05h03h
Requirements for operation:
The burner control unit (FA) must transmit a valid eBUS
message.
The eBUS supply must be activated if the burner does not
also supply the BUS => Expert/ Installation (tap without in-
formation => Test function with and without eBUS supply)
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