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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products Contents 23.10.2002
10.6.5 Display of setpoints....................................................................................... 46
10.7 Generation of setpoint................................................................................... 47
10.7.1 Weather-compensated control......................................................................47
10.7.2 Demand-compensated control ...................................................................... 47
11 Function block "3-position actuator heating circuit"....................................... 48
11.1 Operating lines.............................................................................................. 48
11.2 Limitations..................................................................................................... 48
11.2.1 Flow temperature limitations ......................................................................... 48
11.2.2 Setpoint rise .................................................................................................. 49
11.3 3-position control........................................................................................... 49
11.4 Auxiliary variables in interconnected plants .................................................. 49
11.4.1 Excess mixing valve or heat exchanger temperature.................................... 49
11.5 Pulse lock...................................................................................................... 50
12 Function block "Boiler" .................................................................................. 51
12.1 Operating lines.............................................................................................. 51
12.2 Operating mode............................................................................................. 51
12.3 Limitations..................................................................................................... 51
12.3.1 Maximum limitation of the boiler temperature ............................................... 51
12.3.2 Minimum limitation of the boiler temperature ................................................ 52
12.3.3 Actions during d.h.w. heating........................................................................ 52
12.4 2-position control........................................................................................... 52
12.4.1 Control with a single-stage burner ................................................................ 52
12.4.2 Control with a 2-stage burner........................................................................ 53
12.4.3 Frost protection for the boiler ........................................................................ 54
12.4.4 Protective boiler startup ................................................................................ 55
12.4.5 Protection against boiler overtemperatures................................................... 55
12.5 Operating mode of pump M1......................................................................... 56
13 Function block "Setpoint of return temperature limitation" ............................ 57
13.1 Operating line................................................................................................ 57
13.2 Description .................................................................................................... 57
13.3 Minimum limitation of the return temperature................................................ 57
13.3.1 Acquisition of measured values .................................................................... 57
13.3.2 Mode of operation ......................................................................................... 57
13.3.3 Mode of operation with a single device (with no bus) ...................................58
13.3.4 Mode of operation in interconnected plants .................................................. 58
14 Function block "District heat"......................................................................... 59
14.1 Operating lines.............................................................................................. 59
14.2 Limitations..................................................................................................... 59
14.2.1 Maximum limitation of the primary return temperature.................................. 59