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Building Technologies
Boiler sequence controller RMK770
CE1P3132en
HVAC Products
Contents
23.04.2009
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