Contents SDC / DHC
6 EN2H-0221GE51 R0808
6.8.8 System frost protection.......................................................................124
6.8.9 Pump forced operation .......................................................................127
7 Hydraulic Components..............................................................................................128
7.1 Heat generator: Boiler .....................................................................................128
7.1.1 Heat generator start-up protection......................................................128
7.1.2 Heat generator minimum temperature limit.........................................129
7.1.3 Maximum temperature limit heat generator ........................................130
7.1.4 Heating circuits minimum temperature limit ........................................130
7.1.5 Heat generator sensor control mode ..................................................130
7.1.6 Minimum burner runtime.....................................................................131
7.1.7 Switching: Multi-stage heat generator/Switching differential...............131
7.1.8 Operation for modulating burners .......................................................136
7.1.9 Modulation of P part (Xp)....................................................................137
7.1.10 Modulation of sample time Ta.............................................................137
7.1.11 Modulation of integral action time Tn..................................................138
7.1.12 Modulation of runtime .........................................................................138
7.1.13 Modulation of start time ......................................................................138
7.1.14 Modulation of start power ...................................................................139
7.1.15 OpenTherm ........................................................................................140
7.1.16 Use of boiler sensor 2.........................................................................141
7.1.17 External heat generator cut-off ...........................................................141
7.1.18 Heat generator forced discharge ........................................................141
7.1.19 Exhaust gas temperature monitoring..................................................142
7.1.20 Burner counter mode..........................................................................143
7.2 Heat generation, heat exchanger, district heating ...........................................144
7.2.1 On/Off operation of the district heating valve......................................145
7.2.2 Continuous heat exchanger valve control...........................................145
7.2.3 District heating return temperature limit..............................................147
7.2.4 Return temperature limit for hot-water loading....................................149
7.2.5 Hot-water pre-regulator with district heating systems .........................150
7.2.6 Mode of operation: Hot-water pre-control ...........................................151
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