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5.6
Operating hours counter. . . . . . . . . . . . . . . . . . . . . . . . 38
5.7
Boiler pump control . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.8
Boiler sensor acting as a thermostat . . . . . . . . . . . . . . . . . . 39
5.9
Modulation feedback . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.10
Operational alarm . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.11
Return flow sensor acting as a thermostat . . . . . . . . . . . . . . . . 41
6
Functions of the heating circuit . . . . . . . . . . . . . . . . . . . . 42
6.1
Outdoor temperature-dependent advance heating . . . . . . . . . . . 42
6.2
Optimization using a room sensor . . . . . . . . . . . . . . . . . . . 42
7
Functions of the DHW circuit. . . . . . . . . . . . . . . . . . . . . . 44
7.1
DHW heating in the storage tank system (Anl 1 to 3) . . . . . . . . . . 44
7.1.1
Priority circuit (Anl 1 to 3) . . . . . . . . . . . . . . . . . . . . . . . 45
7.2
Forced charging of the DHW storage tank (Anl 1 to 7) . . . . . . . . . 46
7.3
Thermal disinfection (Anl 1 to 3) . . . . . . . . . . . . . . . . . . . . 47
7.4
External DHW demand (Anl 1 to 7) . . . . . . . . . . . . . . . . . . 48
System-wide functions . . . . . . . . . . . . . . . . . . . . . . . . 49
8
8.1
Weather-compensated control . . . . . . . . . . . . . . . . . . . . . 49
8.1.1
Gradient characteristic . . . . . . . . . . . . . . . . . . . . . . . . 50
8.1.2
4-point characteristic . . . . . . . . . . . . . . . . . . . . . . . . . 51
8.2
Fixed set point control . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.3
8.4
Deactivation depending on outdoor temperature . . . . . . . . . . . . 53
8.5
Summer mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.6
Delayed outdoor temperature adaptation . . . . . . . . . . . . . . . . 54
8.7
Automatic summer time/winter time changeover . . . . . . . . . . . . 55
8.8
Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.9
Forced operation of the pumps . . . . . . . . . . . . . . . . . . . . . 56
8.10
Flow temperature limitation . . . . . . . . . . . . . . . . . . . . . . 56
8.11
Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.11.1
Three-step control . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.11.2
On/off control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.11.3
Continuous control . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.12
Control signal deactivation. . . . . . . . . . . . . . . . . . . . . . . 59
8.13
Processing of external demand. . . . . . . . . . . . . . . . . . . . . 59
8.14
Feedforwarding the outdoor temperature . . . . . . . . . . . . . . . . 59
8.15
Locking of changed settings . . . . . . . . . . . . . . . . . . . . . . 60
Operational faults . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9
4
EB 5474 EN
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