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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