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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E

HVAC Products 15 Function block "Maximum limitation of the return temperature, d.h.w." 23.10.2002

This function can be deactivated on operating line 117. In that case, no maximum limi-

tation of the return temperature is provided during d.h.w. heating.

If the function is active, the display shows

This maximum limitation has priority over minimum limitation of the flow temperature.

Main Page

Default Chapter3
- Table of Contents3
1 Summary11
- Brief Description and Key Features11
- Type Summary11
- Equipment Combinations11
- Suitable Sensors11
- Suitable Room Units12
- Suitable Actuators12
- Communication12
- Passing on of Heat Demand Signal12
- Documentation12
2 Use13
- Types of Plant13
- Types of Houses and Buildings13
- Types of Heating Systems13
- Functions13
3 Fundamentals15
- Key Technical Features15
- Plant Types with Regard to Heating Circuit15
- Plant Types with Regard to D.h.w. Heating15
- Function Blocks15
- Plant Types16
- Selectable Combinations16
- Heating Circuit Type 1 - Space Heating with Mixing Valve17
- Heating Circuit Type 2 - Space Heating with Boiler17
- Heating Circuit Type 3 - Space Heating with District Heat18
- Heating Circuit Type 4 - Precontrol with Mixing Valve18
- Heating Circuit Type 5 - Precontrol with Boiler18
- Heating Circuit Type 6 - Precontrol with District Heat19
- Plant Type 0 - no D.h.w19
- Plant Type 1 - D.h.w. Storage Tank with Charging Pump19
- Plant Type 2 - D.h.w. Storage Tank with Mixing Valve19
- Plant Type 3 - Storage Tank with Diverting Valve20
- Plant Type 4 - Instantaneous D.h.w. Heating Via Heat Exchanger20
- Plant Type 5 - Only Electric Immersion Heater20
- Summary of Plant Types and Plant Combinations21
- Setting Levels, Function Blocks and Plant Types22
- Heating Circuit Operating Modes23
- Automatic Operation23
- Continuously REDUCED Heating23
- Continuously NORMAL Heating23
- Standby23
- Operating Modes23
- Manual Operation24
- Plant Type and Operating Mode24
- Operating State and Operational Level25
4 Acquisition of Measured Values26
- Room Temperature (A6, B5)26
- Measurement26
- Handling Faults26
- Room Model26
- Flow and Boiler Temperature (B1)26
- Handling Faults27
- Outside Temperature (B9)27
- Measurement27
- Primary Return Temperature (B7)27
- Secondary Return Temperature (B71)28
- Measurement28
- Handling Faults28
- Flow Temperature (B3)28
- Storage Tank Temperature (B31, B32)28
5 Function Block "Enduser Space Heating30
- Operating Lines30
- Setpoints30
- General30
- Frost Protection for the Building30
- Heating Program30
- Holiday Program31
6 Function Block "Enduser D.h.w32
- Operating Lines32
- Setpoint32
- Actual Value32
7 Function Block "Enduser General33
- Operating Lines33
- Switching Program 233
- Time of Day and Date33
- Indication of Errors34
8 Function Block "Plant Type35
- Operating Line35
- General35
9 Function Block "Cascade Slave36
- Operating Lines36
- Mode of Operation36
- Boiler Sequence Release Integral (KFI)36
- Boiler Sequence Reset Integral (KRI)36
10 Function Block "Space Heating37
- Operating Lines37
- ECO Function37
- Compensating Variables and Auxiliary Variables37
- Heating Limits38
- Mode of Operation38
- Operating Modes and Operating States39
- Room Temperature Source39
- Optimization39
- Definition and Purpose39
- Fundamentals39
- Process40
- Room Model Temperature40
- Optimum Stop Control41
- Quick Setback41
- Optimum Start Control42
- Boost Heating42
- Room Functions43
- Maximum Limitation of the Room Temperature43
- Room Influence43
- Heating Curve44
- Purpose44
- Basic Setting44
- Deflection45
- Parallel Displacement of Heating Curve46
- Display of Setpoints46
- Generation of Setpoint47
- Weather-Compensated Control47
- Demand-Compensated Control47
11 Function Block "3-Position Actuator Heating Circuit48
- Operating Lines48
- Limitations48
- Flow Temperature Limitations48
- Setpoint Rise49
- 3-Position Control49
- Auxiliary Variables in Interconnected Plants49
- Excess Mixing Valve or Heat Exchanger Temperature49
- Pulse Lock50
12 Function Block "Boiler51
- Operating Lines51
- Operating Mode51
- Limitations51
- Maximum Limitation of the Boiler Temperature51
- Minimum Limitation of the Boiler Temperature52
- Actions During D.h.w. Heating52
- 2-Position Control52
- Control with a Single-Stage Burner52
- Control with a 2-Stage Burner53
- Frost Protection for the Boiler54
- Protective Boiler Startup55
- Protection against Boiler Overtemperatures55
- Operating Mode of Pump M156
13 Function Block "Setpoint of Return Temperature Limitation57
- Operating Line57
- Description57
- Minimum Limitation of the Return Temperature57
- Acquisition of Measured Values57
- Mode of Operation57
- Mode of Operation with a Single Device (with no Bus)58
- Mode of Operation in Interconnected Plants58
14 Function Block "District Heat59
- Operating Lines59
- Limitations59
- Maximum Limitation of the Primary Return Temperature59
- Maximum Limitation of Return Temperature Differential (DRT Limitation)60
- Integral Action Time61
- Minimum Stroke Limitation (Suppression of Hydraulic Creep)61
- Limitation of the Volumetric Flow61
15 Function Block "Maximum Limitation of the Return Temperature, D.h.w62
- Operating Line62
- Purpose62
- Function62
16 Function Block "Basic Settings D.h.w64
- Operating Lines64
- Assignment of D.h.w. Heating64
- Program for the Circulating Pump64
- General Mode of Operation64
- Operation of Circulating Pump During the Holiday Period65
- Frost Protection for D.h.w66
- Frost Protection in the D.h.w. Storage Tank66
- Frost Protection in the D.h.w. Storage Tank Flow66
- Frost Protection for the Secondary D.h.w. Flow66
17 Function Block "Release of D.h.w. Heating67
- Operating Line67
- Release67
- Function67
- Release Programs67
- Heating During the Holiday Period68
18 Function Block "D.h.w. Priority and Flow Temperature Setpoint69
- Operating Line69
- Settings69
- Priority69
- Absolute Priority69
- Shifting Priority70
- No Priority70
- Flow Temperature Setpoint70
- Maximum Selection70
- D.h.w71
19 Function Block "D.h.w. Storage Tank72
- Operating Lines72
- Charging72
- Charging with Hot Water72
- Alternate D.h.w. Charging with Hot Water and Electricity72
- Temperature and D.h.w. Switching Differential73
- Boost of the D.h.w. Charging Temperature74
- Maximum D.h.w. Charging Time74
- Setpoint of Legionella Function74
- Forced Charging75
- Protection against Discharging75
- Purpose75
- Mode of Operation75
- Manual D.h.w. Charging76
20 Function Block "3-Position Actuator for D.h.w77
- Operating Lines77
- Function77
- Flow Temperature Boost77
- Temperature Control77
- Pulse Lock77
21 Function Block "Derivative Action Time D.h.w. Heating Via Heat Exchanger78
- Operating Line78
- Description78
22 Function Block "Multi-Functional Relay79
- Operating Lines79
- Functions79
- No Function79
- Outside Temperature Switch79
- ON / off According to the Time Switch80
- Relay Energized in the Event of Fault80
- Relay Energized During Occupancy Time80
- Relay Energized During Occupancy Time (Including Optimizations)80
- Relay Energized, if There Is Demand for Heat80
- Manually on / off80
23 Function Block "Legionella Function81
- Operating Lines81
- Periodicity of Legionella Function81
- Time of Legionella Function81
- Dwelling Time at the Legionella Setpoint81
- Circulating Pump Operation During the Legionella Function81
- Mode of Operation81
24 Function Block "Switching Program 383
- Operating Lines83
- Function83
25 Function Block "Service Functions and General Settings84
- Operating Lines84
- Display Functions84
- Flow Temperature Setpoint84
- Heating Curve85
- Hours Run Counter85
- Software Version85
- Identification Number of Room Unit86
- Radio Clock, Elapsed Time Since Last Reception86
- Commissioning Aids86
- Simulation of the Outside Temperature86
- Relay Test87
- Sensor Test87
- Test of H-Contacts88
- Auxiliary Functions88
- Frost Protection for the Plant88
- Flow Alarm89
- Manual Overriding of Operating Mode (Contact H1)90
- Pump Overrun90
- Pump Kick90
- Winter- / Summertime Changeover90
- Gain of Locking Signal91
- Entries for LPB92
- Source of Time of Day92
- Outside Temperature Source92
- Addressing the Devices93
- Bus Power Supply93
- Bus Loading Number94
- Heat Demand Output DC 094
26 Function Block "Locking Functions95
- Operating Line95
- Locking the Settings on the Software Side95
- Locking the Settings for District Heat on the Hardware Side95
27 Communication96
- Combination with Room Units96
- General96
- Combination with Room Unit QAW5096
- Combination with Room Unit QAW7096
- Combination with SYNERGYR Central Unit OZW3098
- Communication with Other Devices98
- Data Bus98
- Heat Demand Signal99
28 Handling100
- Operation100
- General100
- Analog Operating Elements101
- Digital Operating Elements102
- Setting Levels and Access Rights103
- Commissioning103
- Installation Instructions103
- Operating Lines103
- Installation104
- Mounting Location104
- Mounting Choices104
- Electrical Installation104
29 Engineering105
- Connection Terminals105
- Low-Voltage Side105
- Mains Voltage Side105
- Connection Diagrams106
- Low-Voltage Side106
- Mains Voltage Side106
30 Mechanical Design107
- Basic Design107
- Dimensions107
31 Technical Data108

Siemens RVL471 - Page 63

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