Siemens Synco 700 Series Basic Documentation page 5

Building Technologies
HVAC Products
5.8.2 Pump supervision and twin pumps................................................................ 70
5.8.3 Changeover logic........................................................................................... 71
5.8.4 Overload message and supervision of flow................................................... 72
6 Boiler sequence management....................................................................... 73
6.1 Overview of function block............................................................................. 73
6.2 Configuration ................................................................................................. 74
6.3 Boiler sequence management....................................................................... 77
6.3.1 Concept ......................................................................................................... 77
6.3.2 Orders for boilers to be switched on and off.................................................. 78
6.3.3 Boiler sequence order ................................................................................... 81
6.3.4 Boiler sequence operating mode................................................................... 83
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 request ..................................................................... 91
6.5.1 Heat request modulating ............................................................................... 92
6.5.2 Heat request 2-position ................................................................................. 92
6.5.3 Heat demand transformers............................................................................ 93
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.............................................................................................. 95
6.7 Diagnostics .................................................................................................... 95
6.8 Fault handling ................................................................................................ 97
7 Boiler control.................................................................................................. 99
7.1 Overview of function block............................................................................. 99
7.2 Configuration ............................................................................................... 101
7.2.1 Burner types ................................................................................................ 103
7.2.2 Boiler hydraulics .......................................................................................... 104
7.3 Additional boilers ......................................................................................... 106
7.4 Boiler operating modes and boiler setpoints ............................................... 106
7.5 Releasing and locking a boiler..................................................................... 106
7.6 Individual operation ..................................................................................... 107
7.7 Test mode and commissioning aids ............................................................ 108
7.8 Control of the burner.................................................................................... 109
7.8.1 2-position control of 1-stage burners ........................................................... 109
7.8.2 2-position control of 2-stage burners ........................................................... 110
7.8.3 Control of burner's basic stage and stage 2 ................................................ 110
7.8.4 Control of modulating burners ..................................................................... 112
7.8.5 External burner control ................................................................................ 116
7.9 Protective boiler functions ........................................................................... 116
Boiler sequence controller RMK770
Contents
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CE1P3132en
23.04.2009