Special conditions
Outputs
External temperature below freezing (frost-protection function will be activated as required)
Optimised heating phase
Optimised temperature reduction/switch-off phase
Flow or return-temperature limiting function has been triggered
Emergency operation: flow transmitter defective
Valve 1 opens
Time-channel contact to exterior is open (will
only be displayed for creating the corresponding
time program)
Valve 1 closes Time-channel contact to exterior closed
Valve 2 opens Charge pump for domestic hot water on
Valve 2 closes Circulation pump for domestic hot water on
Circulation pump of heating circuit 1 on
Charge pump 2 on
Circulation pump of heating circuit 2 on
Internal circulation pump (secondary) on
Speed-reduction output for
circulation pump of heating circuit 1 switched on
OPTEIN output on
Speed-reduction output for
circulation pump of heating circuit 2 switched on
Heat demand
OPT
OPT
LIM
LIM
0
I
2
2
2
2
3
OPT
2
R
–
5
–
7 000458 003
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