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5.10 Pump management . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.11 Potentiometer input . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6 Functions of the DHW circuit. . . . . . . . . . . . . . . . . . . . . . 49
6.1 DHW heating in the storage tank system . . . . . . . . . . . . . . . . 49
6.2 DHW heating in the storage tank charging system . . . . . . . . . . . 51
6.3 DHW heating with solar system (Anl 2, 3, 4, 5 und 9) . . . . . . . . . 53
6.4 DHW heating in instantaneous heating system (Anl 6). . . . . . . . . . 53
6.5 Circulation pump operation during storage tank charging. . . . . . . . 54
6.6 Circulation over the heat exchanger . . . . . . . . . . . . . . . . . . 54
6.7 Intermediate heating operation (Anl 2, 3 and 9) . . . . . . . . . . . . 54
6.8 Parallel pump operation (Anl 2, 3 and 9). . . . . . . . . . . . . . . . 54
6.9 Priority circuit (Anl 4, 5, 6, 7, 8 and 11) . . . . . . . . . . . . . . . . 55
6.9.1 Reverse control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.9.2 Set-back operation . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.10 Forced charging of the DHW storage tank (Anl 2, 3, 5, 7, 8 and 9) . . . 56
6.11 Thermal disinfection of the DHW storage tank . . . . . . . . . . . . . 56
7 System-wide functions . . . . . . . . . . . . . . . . . . . . . . . . 57
7.1 Automatic summer time/winter time changeover . . . . . . . . . . . . 57
7.2 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.3 Forced operation of the pumps. . . . . . . . . . . . . . . . . . . . . 57
7.4 Return flow temperature limitation . . . . . . . . . . . . . . . . . . . 57
7.5 Condensate accumulation control . . . . . . . . . . . . . . . . . . . 59
7.6 Three-step control . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.7 On/off control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.8 Releasing a control circuit over the binary input. . . . . . . . . . . . . 60
7.9 Processing of external demand in RK1 . . . . . . . . . . . . . . . . . 60
7.10 Flow rate/capacity limitation. . . . . . . . . . . . . . . . . . . . . . 61
7.10.1 Limitation using pulse input . . . . . . . . . . . . . . . . . . . . . . 61
7.10.2 Limitation using 0/4 to 20 mA signal. . . . . . . . . . . . . . . . . . 62
7.11 Locking manual levels . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.12 Setting a customized key number. . . . . . . . . . . . . . . . . . . . 63
8 Operational faults . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.1 Sensor failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.2 Collective error alarm . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.3 Temperature monitoring . . . . . . . . . . . . . . . . . . . . . . . . 65
8.4 Error status register . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4 EB 5476 EN
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