Honeywell SDC heating and district heating controller Service Manual page 6

Contents
6.8.8
6.8.9
7 Hydraulic Components..............................................................................................128
7.1 Heat generator: Boiler .....................................................................................128
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
7.1.6
7.1.7
7.1.8
7.1.9
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
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
6
System frost protection .......................................................................124
Pump forced operation .......................................................................127
Heat generator start-up protection......................................................128
Heat generator minimum temperature limit.........................................129
Maximum temperature limit heat generator ........................................130
Heating circuits minimum temperature limit ........................................130
Heat generator sensor control mode ..................................................130
Minimum burner runtime.....................................................................131
Switching: Multi-stage heat generator/Switching differential...............131
Operation for modulating burners .......................................................136
Modulation of P part (Xp)....................................................................137
On/Off operation of the district heating valve......................................145
Continuous heat exchanger valve control...........................................145
District heating return temperature limit ..............................................147
Return temperature limit for hot-water loading....................................149
Hot-water pre-regulator with district heating systems .........................150
Mode of operation: Hot-water pre-control ...........................................151
SDC / DHC
EN2H-0221GE51 R0808