Honeywell SDC 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 R0812