Siemens Synco700 RMK770 Documentation Handbook page 5

Building Technologies
HVAC Products
5.8.1 Changeover logic........................................................................................... 72
5.8.2 Overload message and supervision of flow................................................... 73
6 Boiler sequence management....................................................................... 74
6.1 Function block overview ................................................................................ 74
6.2 Configuration ................................................................................................. 76
6.3 Boiler sequence management....................................................................... 78
6.3.1 Concept ......................................................................................................... 78
6.3.2 Orders for boilers to be switched on and off.................................................. 79
6.3.3 Boiler sequence order ................................................................................... 82
6.3.4 Boiler sequence operating mode................................................................... 84
6.3.5 Sustained mode............................................................................................. 85
6.3.6 Switching boilers on and off........................................................................... 85
6.4 Supervision of faults ...................................................................................... 89
6.5 Heat demand and heat requisition................................................................. 91
6.6 Other functions .............................................................................................. 93
6.6.1 Common maintained boiler return temperature............................................. 93
6.6.2 Maximum limitation of the flow temperature setpoint .................................... 94
6.6.3 Frost protection.............................................................................................. 94
6.7 Diagnostics .................................................................................................... 94
6.8 Error handling ................................................................................................ 96
7 Boiler temperature control ............................................................................. 98
7.1 Function block overview ................................................................................ 98
7.2 Configuration ................................................................................................. 99
7.2.1 Burner types ................................................................................................ 102
7.2.2 Boiler hydraulics .......................................................................................... 102
7.3 Additional boilers ......................................................................................... 104
7.4 Boiler operating modes and boiler setpoints ............................................... 104
7.5 Releasing and locking a boiler..................................................................... 105
7.6 Individual operation ..................................................................................... 106
7.7 Test mode and commissioning aids ............................................................ 106
7.8 Burner control .............................................................................................. 107
7.8.1 2-position control of 1-stage burners ........................................................... 107
7.8.2 2-position control of 2-stage burners ........................................................... 108
7.8.3 Control of burner's basic stage and stage 2 ................................................ 108
7.8.4 Control of modulating burners ..................................................................... 110
7.8.5 External burner control ................................................................................ 114
7.9 Protective boiler functions ........................................................................... 114
7.9.1 Maximum limitation of the boiler temperature.............................................. 115
7.9.2 Minimum limitation of the boiler temperature............................................... 115
7.9.3 Protective boiler startup............................................................................... 115
7.9.4 Optimization of the minimum boiler temperature......................................... 116
Boiler Sequence Controller RMK770
Contents
5/226
CE1P3132en
01.03.2005